Natural Fibers - Science topic

I like to know how seawater we use in cement mixing and maybe some about using plastic, glass, and natural fibers.

Thank you,

Natural fiber, Polymer

If natural fibre micron size increase, what about the thermal conductivity of polymer composite material. pls explain the mechanism behind that.

I am excited to tell you that I am the Guest Editor of a new Special Collection titled: 'Advanced Bio-Composite Development through the Valorization of Agricultural Waste.' This is being published by Sage Publishing in their journal "Composites and Advanced Materials," which is a JCR-ranked, peer-reviewed, open-access journal. Here is a link to the journal: "https://lnkd.in/dJzXs8Nk

". I launched this unique collection because synthetic fiber-reinforced composites (FRCs) have significantly increased in various applications. This rise in usage has raised concerns about environmental and sustainability issues due to the energy-intensive and unsustainable production processes involved in fabricating these composites. Limited recyclability and disposal options for FRCs have led to a growing demand for biocomposites made from natural fibers, such as agricultural waste, combined with biodegradable polymers to replace FRCs. Natural fiber-based biocomposites offer several advantages over traditional composites, including increased sustainability, strength, and durability. Additionally, many agricultural wastes remain underutilized and could be explored to develop advanced biocomposites using various techniques. These techniques include utilizing natural fibers as reinforcement, filler, or a hybrid of both in the composite material. One of the main benefits of using agricultural waste in advanced biocomposites is that it reduces waste going to landfills and incinerators. Moreover, it helps minimize the environmental impact of manufacturing traditional composites, which often rely on synthetic fossil-fuel fibers. Please consider publishing your latest research in this Special Collection. If you are interested, don't hesitate to contact me with your suggested title, and I will pass on your details to Sage so they may work with you toward publication. As per Open Access publication requirements, you would be charged the total publication fee; however, the benefit is that your paper would appear not only in the regular issue but also in the Special Collections, thus attracting increased readership. Ongoing promotions for the Special Collection will ensure your paper continually receives views, downloads, and citations. Please feel free to contact me if you have any questions. I am excited to hear from you. I appreciate your consideration. Time is running out, so send your manuscript today!!!

There is no ASTM standard or this. I don't want to prepare composite laminate and conduct shear test or IFSS. I want to make a decision in the treatment stage itself. Is it possible to embed one end of the natural fiber in a small piece of epoxy matrix and conduct a tensile test wherein fiber is pulled out of the matrix and force is noted ? Did someone try it out and got reliable results ? If there is no ASTM standard, then what is the way to go ?

Is there a fundamental theory of polymer fibers and nanofibers?

I work with polymer fibers and I am interested in whether there is a fundamental theory to describe them. Suppose fibers are composed of an amorphous rather than crystalline polymer. If they are very thin, they will be unstable for two reasons. Firstly, they have a large free surface area and hence high surface energy. Secondly they are usually composed of highly oriented polymer molecules, which are entropy depleted and tend to adopt a Gaussian coil conformation. Despite the effect of these two factors, nanofibers made of amorphous polymers can be stable in some cases.

Are there theories that estimate the limits of their stability (taking into account the flexibility of polymers and the interaction energy between links)? Are such theories applicable to partially crystalline polymers? I am 100% sure that these theories exist, could you please help me to find them?

While the effects of growth, harvest, and supply conditions on natural fiber quality are

generally known, there is a lack of comprehensive studies that systematically examine how

these parameters impact the performance of natural fibers in composite materials. The

optimization of these conditions for specific fiber types, with the goal of enhancing their

effectiveness in composites, is not well documented in a unified manner.

As far as my understanding goes, the intention of alkali treatment is to remove non-cellulosic hemicellulose, lignin, wax and other impurities and enhance the surface roughness and crystallinity. The molecular chains of cellulose rearrange themselves into closely packed long chain, thereby increasing the crystallinity. When non-cellulosic components that seal the gap between the microfibrils are removed the surface roughness increase.

However, when non-cellulosic components like hemicellulose and wax are removed, that exposes more hydrophilic cellulose to water. Also, lignin is hydrophobic, when it is removed all we have a hydrophilic cellulose.

I do know the name of analytical methods, but not the method in detail. Kurschner and Hoffer’s method for cellulose determination. Klason method to determine lignin. Wax content by conrad method. Ash content was analyzed as per the ASTM E1755-61 standard.

I would like to know the method. Are there any references that you know ? and where such tests can be done in India, preferably South India. Are there any such laboratories ?

Is there a single JCPDS card for natural fiber ? My understanding is that all natural fibers basically have the same constituents albeit they are in different concentration. Cellulose, hemicellulose, lignin, pectin and wax. Natural fiber is a semi-crystalline material, so expect amorphous and crystalline indicators in the XRD graph.

I know of a place in Tamil Nadu where for one sample cost is 5000. I am looking for a cheaper alternative.

This is the XRD plot of natural fiber. Usually in almost all the papers, 2 peaks appear for natural fiber. One broader amorphous peak at lower diffraction angle and lower intensity and another sharper crystalline peak at higher diffraction angle and higher intensity. Percentage crystallinity equation is PC = Intensity of crystalline peak/(intensity of crystalline + amorphous peaks). In my graphs I am getting multiple sharp peaks. Why is this ? Should I add up all the peak intensities to get total intensity of crystalline phase ?

Would you please let me to know about the methods for measurement of medullation and Kemp % on animal? My problem is that the wool sampling and sending to laboratory is not possible. So I would like to verify the possibility of a method to measure Kemp/medullation % in wool rapidly on the animal. I know "Benzene test" (attached file) for distinguishing of Kemp fibers, but Benzene is a risky material. Furthermore the use of portable OFDA in our situation is not possible.

Is there safe substance similar to benzene that has the similar optical refractive index ? Which safe liquid can be found that has a light refractive index similar to wool? (1.54). Sincerely,

Journal of natural fibers seems to have come down to Q2.

Please. Could someone propose to me a simple or detailed lab procedure to perform grafting copolymerization onto natural fibers?

I created a composite using natural fiber and polyester resin, natural fiber +epoxy resin.

I got stress-strain curve from tensile test.

what is the strain range for composite material finding the young modulus of the curve?

Epoxy ?

Polyester?

Should I get certain 'fungi' or buy enzymes and use it directly for biological treatment ? Which enzymes can be used ? Where to buy from ?

In characterization of composites, why failure mechanism at microscopic level has not been investigated on natural fiber reinforced polymer composites?

Much research has been done with natural fibers. Is it possible to use natural resins to make a composite plate?

For example. Coir or coconut husk fibers are short. How can make a continuous fiber out of it. Idea is to prepare unidirectional continuous coir fiber polymer composite.

Banana fiber mat is treated with 4% NaOH in distilled water - 4-hour immersion

Banana fiber mat length is reduced from 30cm to 21 cm. How to avoid shrinkage?

I hope this serious message "call for collaboration" could successfully reach the right professors and/ or funders, both in academic and industrial fields, who are really interested in the research area of "Biomass of Natural Fibers" and thier beneficial effect on a diversity of industrial engineering applications.

Recently, I was deeply involved in the mentioned research area and I have a particular contribution in a project closely related to that mentioned in the above title. To be comprehensive, I’m really willing to lead a research team or join a brilliant team by working under a leadership supervision of one of the esteemed professors in the mentioned research field. I will be so honered to transfer my experience earned from my latest successful project, and I’m sure that an aimful idea for establishing such a researching team work could be a very good step towards a prosperous future in making a multidesciplined progress in this research area and for opening many rooms for academics and indusrtial researchers who are interested in this field to have a prosperous future in thier career in line with the strategic sustainability development taking place worldwide and specifically in countries that are classified to be on popularized with thier agricultural development.

I’m willing to hear inspiring news and welcoming to any questions and feedback from all people who are interested in the idea by any way.

Best wishes,

Faithfully

Eyad Khalaf

PhD in Chemical Engineering, Polymer Composites

Agricultural Wastes Recycling & Sustainability

email: iyads_42@hotmail.com; eyad.sa.khalaf@gmail.com

Tel.no.: +201001488248

Cairo, Egypt

Is there any method available commercially?

Is micro-strain (ε= β/4tan θ) and Dislocation Density (δ=1/D^2) applicable to natural fiber urea formaldehyde composites as well as inoc,nano and metallic materials? if yes, then can anyone share research paper on it's my findings of those parameters are δ=3.708807 and ε=4.384302.

Do the -OH groups of natural fibers interact (other than hydrogen bond) with the diisocyanate (MDI) into a natural fiber-reinforced polyurethane (polyol and diisocyanate) composite?

One researcher did ballistic performance of kevlar fiber impregnated with nanosilica/ polyethylene glycol shear thickening fluid. And he loaded 10, 15, 20Wt% of Nanosilica with polyethylene glycol.

After fabrication, how we can confirm the equal distribution of nanosilica over the kevlar. Whether nanosilica is spread all over the kevlar equally or not?

How I can confirm? Any SEM, TEM test required ?

I am looking for development of natural fiber based epoxy composite. If the selected natural fiber will be less porous than consumption of epoxy will be less and developed composite will be light weight

Why do micro-cracks forms in the matrix zones of FRP composites?

(a) Is it a Defect ?

(b) Does it has any effect on the initiation of fracture during the load applied?

I am following ASTM D7264 for conducting Flexural strength test of natural fiber polymer composite. Initially support span to thickness ratio of 32:1 was planned but due to miscommunication 32:1 is now total length to thickness ratio. Now if I am using 20:1 which is also allowed as per the ASTM standard I will have 36% of total length as overhanging portion. The standard recommends about 20%, doesn't say if it os minimum or maximum. Does taking higher overhanging length effect the result?

Chemical treatment is done to ensure better fiber-polymer bonding by diminishing water absorbing tendency of natural fibers. Good mechanical properties are expected after this operation. Nevertheless, is it possible to have lower tensile, flexural properties in composites than the untreated ones? If so, what could be the possible reasons behind?

I want to know the process and characterization techniques to extract cellulose nano crystal from natural fibers..

I have got FTIR spectra of natural fibers and would like to know the surface concentration of lignin and cellulose. Is there any method for quantitative calculation for different components based on FTIR? How?

I have conducted 5 % concentrated alkaline (NaOH) treatment for my woven natural fiber (HEMP) to remove the impurities and unwanted wax that present in the fiber. To my surprise, after the chemical treatment hemp fiber colour changed as well as diameter of the fiber bundle got increased more than 50 %. Can anyone tell me the reason?

I need to test tensile properties of woven bidirectionally woven fiber which will be used to prepare composites. How do I measure the tensile properties (tensile strength and modulus) of it ? There is a standard for tear strength D5587 − 15 that measures tear strength of partially torn fabric. But this cannot be related to tensile strength since tensile strength is actually stress that can be handled to resist yield or fracture (MPa). Tear strength is actually force needed to completely tear a already torn fabric. So, please let me know the suitable standard to measure tensile strength.

I would like to perform surface roughness of natural fibers by either using AFM or Laser micrsocpy, what are the main sample preparation steps involved for better results and accurate measurement?

specimen will develop from hybrid natural fibers

I have found mostly the modulus of elasticity gradually increases with fiber percentage. If it is a must, then why does it happen? Is the reverse of it, I mean, gradually decrement of modulus possible?

if you can send the link of related papers?

Usually, we use tensile strength and youngs modulus to determine the properties of natural fibers. Why don't we use specific strength and specific modulus?

What are the risks of moisture absorption in the natural fibers exposed by drilling?

I need Pineapple leaf fiber to fabricate composite material for research purpose. Where can I buy it from ?

The weaved fiber I have is plain weaved bi-directional natural fiber. I need find its tensile strength. The ASTM standard D3039 applicable to PMCs is not applicable to weaved fibers, fiber mats, etc. D5587 − 15 trapezoidal method of determining tear strength applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile, and nonwoven fabrics. Am I technically correct in using this standard ? Have anyone used this standard before ? Please share your experience.

How do I find chemical composition of natural fiber. Since cellulose, hemicellulose are all organic containing C, H and O elementally, how to find the chemical composition not elemental which can be determined from SEM-EDX.

I am working on natural fiber epoxy composites. The Poissons ratio of composite can be calculated theoretically based on composites rule. But, what are the experimental techniques to evaluate the composites Poisson's ratio? Poisson's ratio of fiber and matrix is known.

I'm looking for prepared a biodegradable composite, which will be made by natural fiber like sponge-gourd or jute fiber.

For Cylindricity Measurement Apart from the Co-ordinate Measuring Machine, Which one is the best and easiest method for calculating the Cylindricity of the drilled Specimen. (Natural Fiber Reinforced Polymer Composites.)

Surface sizing agents are mostly amphiphilic molecules, having both hydrophilic (water-loving) and hydrophobic (water-repelling) ends. The sizing agent adheres to substrate fibers and forms a film, with the hydrophilic tail facing the fiber and the hydrophobic tail facing outwards, resulting in a smooth finish that tends to be water-repellent.

Dear researchers, I would like to use 3D printers to make samples in bio composites (PLA + Natural fibers). Do you have any idea.

In a stress-strain curve of an FRP composite, mostly it is represented strain in terms of (%) rather than in (mm). Why it is represented in such a way?

How much time remains between acceptance and production (author agreement) of the article in the journal of natural fibers ( Taylor & Francis).

powdered fibers or completed fibers(without being crushed and grinded)

After alkaline treatment (various % concentrations) with Natural fiber, dry in the hot air oven at 70 degrees Celcius for 4hrs.

1). 'Na' is coated on the surface of the fiber. how a coating of 'Na ' Varies with the strength of Natural fiber

In order to give input during FE modelling of NFRPC, this value is required. How to determine? Kindly enlighten me.

We are trying to carry out surface modification (using alkali treatment) on selected natural fibres for use in cement matrix composites. However, some of our team members proposed using demineralized water for the treatment process in place of the commonly used distilled water. Several literatures have reported the use of distilled water in this process but as of today (29th June, 2021) and as much as I know, I have not seen/read any literature suggesting the use of demineralized water for this particular process.

How to find density of natural fibers, which are also hydrophobic in nature and micro porous? Also when we use thermoplastic as matrix and natural fiber as reinforcement, the density of fiber may vary due to variation in inter-facial bonding and due to processing conditions. Then which value is to be considered as benchmark?

I have prepared natural fiber reinforced polyolefin composite for which methane emission has to be estimated once it lands to landfill after completing the service life. Is there any article which talks about this or any methodology to estimate the green house gas emission specially methane.

iam doing a simulation in ansys composite prepost for a natural fiber reinforced polymer composite.so in-order to obtain the numerical result i need to add the material properties for the woven fabric in ansys engineering data.so kindly please help me to find out the procedure for finding out the young's modulus , shear modulus, poisons ratio in x,y,z direction for the woven fabric material experimentally.

Natural fibers are usually obtained by retting of stems of bast fiber yielding plants and then beating them manually or mechanically to separate the fibers. I would like to know if there is any method by which it can be done without the process of beating.

In making of natural fiber based bio composite, researchers are looking for natural materials, in this context i want to know about the additives used to cure the matrix materials for biocomposites.

what are wood plastic composites (WPCs)? Are the composites made with natural fibers and polymers comes under WPC category? why thermoplastic polymers are usually used for the synthesis of WPCs?

Dear network,

I am looking for the LCA or LCI or at least the energy balances of the non woven fabrics process for my master project, in specific for natural fibers, yet I have found difficulties in finding the proper information. If you have by any chance information or papers containing this kind of info, please let me know,

Thanks in advance

I am working in polyester/ natural fiber composite—my research work is facing this trouble.

Hi everyone,

I am looking for a machine to grind the natural fibers for use in concrete (fiber reinforced concrete). I appreciate if you can suggest a good type or share your experiences in this case.

Best Regards,

1. In a Low-velocity impact test, I have got Force vs Time response. There were two peaks in cross-ply and angle-ply orientation. In cross-ply, its peak to peak distance is lesser when compared to angle-ply. What is its significance?

2. Another was, steep rise in the cross-ply but the linear increment in angle -ply. What might be the reason?

Looking for making a noble green composite (nano-biocomposite) by sponge-gourd (Luffa cylindrica) natural fiber, where PLA will be used as a matrix material.

How the diameter of the fiber plays a role in interfacial bonding? If the dia of Fiber is small, we assume the matrix will completely adhere to the fiber. If the dia is larger, the same matrix covers the fiber. Whatever the surface area might be. It depends on how good it binds the fibers. But how this dia play a role in that?

Papaya is a delicious fruit and vegetable contains  Vitamin A, Vitamin C and Vitamin K as well as potassium, magnesium, protein carotene and natural fiber. But not only in papaya, its seeds also have many qualities. Although its taste and smell a bit intense. Papaya seeds are full of phenolic and floboyed substances. It contains proteins, calcium, magnesium and phosphorus.

Hello,

I'm studying PhD at BarcelonaTech and I got the problem of the degradability of natural fibers in cementitious matrices.

So far, we got to protect the fiber usin resin, but I am looking for another solutions that can protect the fiber againts the alkaline attack.

I work with threads of natural fibers instead of only fibers.

Have some of you studied it?

Thank you in advance!

How to determine cellulose, Hemi-cellulose, Lignin Content of natural fiber?...What type of chemical treatment should done to determine these contents....Please provide the details which you find very useful.

Hi,

I am researching sustainable materials for product design. I would like to use liquid resins which are relatively easier to handle and can be used in multiple ways like natural fiber reinforcement and casting. At the same time, they should also be biodegradable. 

Thank you.

Whether Natural fibers be reinforced with Metal matrix to improve their properties? What kind of mechanism is involved in this?

A Previous well-known technique is TG/DTg but the fibers decompose with the rubber on raising the temperature so it won't work what else characterization technique we can use for this particular.

I was doing a mixing of a natural fiber filler in a elastomer matrix before the mixing size 200 nm and after mixing i found the fiber particle size was reduced to 50 nm(With respect to SEM analysis) what may be the reason kindly suggest with reference.

Cellulose is normally crystalline in nature. I need to reduce the crystalline nature of cellulose extraced from natural fiber so that its thermal conductivity gets reduced.

Dear All,

I have to perform natural fiber treatment.

I don't have the idea of how much quantity of fiber needs to be added to solution.

For e.g. if I have 1 litre of (5%NaOH + water) how much quantity of fiber can I add to it?

Please help me on this.

Thanks,

Gangadhar

for research work

i am using short natural fibers for preparation a bio composite..i need to know what the range of fibers lengths

I was asking if we could convert fibers into powder and what kind of techniques could be used.

to enhance natural fiber one can use cross linking reaction mechanism with some chemicals, e.g potassium per manganate, formaldehyde citric acid etc. among these i need to know preferable ones.

The concentration of silane was fixed as the weight of silane relative to weight of fibres. Eg: In 5 wt% of silane solution, the 0.5 g of silane was dissolved in the ethanol/water solution for 10 g of fibres. So, is the amount of ethanol/water mixture important in silane treatment? Or the maximum amount of the mixture is 50 ml for 5 wt% of silane? Thank you very much

what effect of natural fiber diameter on sound absorption in polyurethane composite foams?

Whatever the diameter of the fiber be lowered, the composite sound absorption will be better?