Questions related to Polymeric Materials
I need to evaluate the antioxidant and cytotoxicity activity for polymeric material . It doesnt dissolve in common organic solvents even dmso. Is there is a way to do such test!
It's humble request for facts approximately correlation between variation of conductivity of material with XRD Pattern.From some other studies the conductivity of polymeric material is increasing with sensitisation.Can it's feasible to explain through the xrd peaks broadening pattern?
Please check out our featured collection on “Bio-based Halogen-free Flame Retardant Polymeric Materials”.
Flame retardant technology from bio-based resources has gained increasing interests owing to increasing awareness on environmental protection and sustainable development. Bio-based halogen-free flame retardant is a hot research area nowadays as it is safe, non-toxic and sustainable flame retardant.
This special issue mainly focuses on the latest advances in bio-based halogen-free flame retardant polymeric materials application. More info: https://www.techscience.com/jrm/special_detail/bio-based_materials.
This special issue is a quality collection and is also published as an electronic book. Learn more: https://www.techscience.com/book/detail/halogen-free
1.Bio-Based Halogen-Free Flame Retardant Polymeric Materials
2.Recent Advances in Flame Retardant Bio-Based Benzoxazine Resins
3.Preparation and Properties of Bio-Based Flame Retardant L-APP/Poly(L-lactic acid) Composites
4.Influence of Beta-Cyclodextrin Functionalized Tin Phenylphosphonate on the Thermal Stability and Flame Retardancy of Epoxy Composites
5.Effect of MMT on Flame Retardancy of PLA/IFR/LDH Composites
6.Facile Synthesis of a Novel Bio-Based P-N Containing Flame Retardant for Effectively Reducing the Fire Hazards of Epoxy Resin
7.Phosphorylated Salicylic Acid as Flame Retardant in Epoxy Resins and Composites
8.Halogen-Free Flame Retarded Poly(Lactic Acid) with an Isosorbide-Derived Polyphosphonate
9.A New DOPO-Eugenol Adduct as an Effective Flame Retardant for Epoxy Thermosets with Improved Mechanical Properties
10.A Vanillin-Derived, DOPO-Contained Bisphenol as a Reactive Flame Retardant for High-Performance Epoxy Thermosets
11.Bio-Based Trivalent Phytate: A Novel Strategy for Enhancing Fire Performance of Rigid Polyurethane Foam Composites
12.Borate-Modified, Flame-Retardant Paper Packaging Materials for Archive Conservation
13.Study of Burning Behaviors and Fire Risk of Flame Retardant Plywood by Cone Calorimeter and TG Test
By TSDC,Transient Current mesurment and Steady state dark conduction current study.We can calculate the activation energy and effective metal potential barrier . Optical energy band gap calculated through UV Spectroscopy.
Please suggest the study for confirmation of electrical conductivity of polymeric materials.
What are the critical rules to pay attention during manufacturing masterbatch especially when working with inorganic nanoparticles? What should be considered in order to achieve the homogenously dispersion in the polymer matrix without destroying the screw and the polymer?
Does anyone know some replaceable polymeric materials with PTFE which cover also all benefits of PTFE?
thank tou in advance
I have been reading about thermoplastics, and in some publications they say that they can be melted, in fact, some people use the word "melt". But some other publications indicate, that due to the fact that thermoplastics polymers can't be 100% crystalline and therefore they always have and amorphous part there is no way to melt a thermoplastic polymer.
If thermoplastic polymers can't be melted, then How must be called that state in what the material flows? If it can't be melted, then it is not a liguid state.
I will aprecciate your help
The shear strength of foams is a question. All of them currently are made with a uniform density of say 50 or 100 KG/ CU.M. The maximum shear stress is invariably related to their density. So why not have a higher density at the core and a lower density at the surface, there by maintaining a low over all density, in order to have a high shear strength at the core ? Will this FGM idea work for a manufacturer ?
Consider a small tube made of polymer or ceramic (inner diameter of about 3mm, outer diameter of about 1cm, and 5cm length), inside which a high-gas pressure should be generated in a short time (few microseconds). How can we measure the maximum gas pressure that the tube can withstand before it breaks or deforms, even before starting the actual experiment?
What are alpha and beta relaxation, seen in polymeric materials (observed in dielectric studies)? I wanted to know the physical origin and the way to identify them in dielectric spectra.
Might be a silly question for this forum, but I need round polymer fibers approx 10µm diameter, minimum 50mm length but preferably on reel. Preferably non toxic. Preferably European supplier. Anyone that can point me in the right direction?
Is there any standard procedure for torsion test of polymeric materials under static loads at ambient temperatures or an existing standard for other materials should be used?
I am studying a thermoplastic polyester elastomer. I want to get a prony series from the data available that can be further used for FEA simulations. Is there any way to obtain the prony series parameters from the available data.
(Data sheet is attached)
What polymeric material has the most similar properties as nylon 6.6 in terms of the processing and mechanical properties, and it is not from the polyamides family?
Hello-I am currently writing a research proposal regarding degradation of certain polymers by bacteria but I am not sure what kinds of assays I should be running to identify particular secreted extracellular enzymes that are involved in breakdown of the polymer. Any suggestions would really be appreciated.
Dear Researchers :
Does anyone have experience or knows specific works about the study of Mechanical Properties (i.e. , tensile strength, yield stress, limit of elongation (%), elastic modulus, etc.) of Polymeric Matrices...
These could be:
- Polyethylene/Polypropelene (PP)
- another PP or PE co-polymer, ter-polymer, etc
- HDPE, LDPE, LLDPE
or other plastics or elastometers blends
but when Al2O3 particles (or nps) are embedded in the matrix ??
I will appreciate any help, or any direction,
Best Regards !:)
By considering the fewer number of repeating monomeric units than polymer i.e. Oligomers. How Oligomers are better than polymeric materials in different applications like mechanofluorochromism, gas sensing, or other stimuli-responsive?
in literature we find a lot of studies to check the stability of the polymeric materials by DSC analysis. like PE materials properties were analyzed by measuring the variation in oxidation induction time (OIT). However, no specific studies were performed for the PVC materials (mainly pipes). Can anyone please provide specific reason for that ? or if studies were performed please provide. thanks
I want to make polymer composite ink for 3d printing(Extrusion method).
so, I need a polymer matrix that has low melting point(~100 C, low is better)
And also it should have low viscosity for easy mixing with other material.
Is there any polymer candidate you could recommend for me?
I am currently running thermal polymerizations of compounds that form free radicals at elevated temperatures (T>120 degrees C). I want to attempt to polymerize at discrete temperatures between 120 and 200 degrees C.
Can I use AIBN radical initiator at these elevated temperatures without risk of explosion (in the literature it seems that AIBN is typically used at temps ranging from 60-80 degrees C)?
If not, is there another radical initiator I can use at temperatures this high??
To calculate the cristallite size L We need K the Scherrer Constante
what is mean this parameter and what is its value for the polymers
May I ask if there any ideas to fix the PET film on the glass substrate for nanoindentation test? Because PET itself is not able to attach to the substrate, if we fix the film only by using tapes adhere on four sides of the square shape glass substrate, the film might dislocate during indentation causing the results to become inaccurate. Your ideas and suggestions will be much appreciated. Thank you
My Industry R&D lab is considering purchase of an MS system to go on our existing Waters UPLC. Currently the only MS capability we have is a single quad GC/MS system. We want to be able to (1) analyze larger MW molecules outside of GC range and (2) be able to deformulate competitive product materials in adhesives, and various polymeric materials of various chemistries as well as low abundance additives, etc.
my main concern is that I am reading that sample cleanliness can cause big issues for qTOF work and we typically are analyzing complex formulations. qTOF seems to be the way to go for qualitative identification but how good is it with quantitation compared to a single quad system? how is sensitivity to low abundance compounds?
For my Ph.D. I require polymer membrane (those are irradiated by high energy particle and used in chemical etching). I want to purchase below 80nm pore size membrane. Many companies produce this but they give only packet up to 10000Rs. If anyone can exchange polycarbonate membrane, please contact me.
we specialize in styrene-butadiene emulsion polymerization, we run conversion to 60%, and we recover the unconverted (1.3 butadiene) at a purity of average of 73% and major impurity is (cis-2 butene), how can we minimize this impurity formation
Some residues from ferilizers coatings, and products of hyrogels/agrogels degradation are accumulated in plants tissues. I am looking for literature about this issue, where I can find more details, especially, data related to polymeric contaminations like products of degradation or microplastic. I will be grateful for any help.
Is there any reference to explain the polymeric bonding mechanism of epoxy resin polymeric adhesives to carbon fiber reinforced polymer (CFRP) laminates or strips. I am a structural engineer and I would like to understand the chemistry aspect of this bonding process.
I am currently trying to characterize the behaviour of different plastic polymers, in particular when stretched in an uniaxial direction.
I already conducted the classic tensile test, and got a general idea of the different features that the materials show, but I am having a hard time trying to measure their stretching stiffness; any suggestions on lab tests for this?
I found an equation linking stiffness to the elastic modulus and the resisting cross section, but I`d rather find it in a different way so as to not refer to a single type of test for all of my data.
I need a few polymeric materials that are not water-soluble and at reasonable prices. Can someone guide you?
the food containers are manufactured from polymeric materials which in direct contact with the food inside it and i would like to improve their buckling strength by addition several nano materials to the polymeric materials.
Which failure mechanisms would be triggered by temperature cycling on a polymeric part? (Is it only thermal fatigue?)
I am doing accelerated temperature cycling by simulation, Which criteria can represent latent defects on material? (Creep strain rate, equivalent plastic strain, E-modulus reduction,...)
I build a chamber (10ul) in a PDMS for PCR application but when I heat the chamber (after 5-6 cycles), evaporation occurred and vanish the liquid in the chamber.
It seems the inlet and outlet of the chamber have leakage.
Is it possible that the vapor leak from above of the chamber (2mm PDMS)?
I have accessibility to a cheap source of plexiglass scraps. I am thinking to a recycling projects and producing new products based on PMMA recycling. What is your suggestion for PMMA recycling? What can we make from recycled plexiglass which has both economic value and innovation??
Artificial Membranes, Polymeric Materials, Membrane Technology
I fabricate polymer solutions with a high viscosity and degass them under vacuum. But when I want to pump these solutions, air bubbles produce again. What is the suitable pump for moving solutions without getting air bubbles.
I grow adherent cells on polymeric materials and want to stain cells without using fluorescence.
The stain should be
1. water-based (no alcohols or organic solvents) in order to preserve the integrity of the material
2. intense and stain at least the cytoplasmic fraction of the cell
3. resistant to dehydration
4. stable for at least one week without the requirement for mounting
I would like to check the bio-compatibility of a polymeric material. what are the biochemical/toxicological test or any other method that I can perform in order to prove the bio-compatibility.
Any suggestions on cell line culture or any other method will be highly appreciated.
Thanks in advance for your kind help and suggestion.
Does anyone know the good parameters of sonicator (times, temp, and power) for good dispersion of cellulose nanofibers in water and modification of MWCNT?
Due to their poor electrical and mechanical proprieties, many polymeric materials are not suitable for electric power applications, mainly for electrical insulation. For instance, PVC is widely used in industrial applications, it is intended only for low voltage application though, because of high dielectric constant and high losses.
On the other hand, it has been found that Calcium carbonate, for example, improves the base properties of PVC by adding stiffness to the polymer matrix.
How can improve the mechanical and electrical properties of polymers (PVC, PP, PE,...etc)? and what are the most common (recent) methods used so far?
for producing glass fiber reinforced polyamide 6 composites, we used recycled polyamide 6 which viscosity is 3.5, but after compounding its high viscosity and molecular weight caused problems in injection molding process. so we have to reduce molecular weight of polyamide. can anybody help me about this problem?
Consider we are testing soil and polymeric material as a stress controlled -shear test.
we will plot stress- strain. In this case after getting peak vale, is it possible to get lower values compared to peak value after the peak value is achieved?
Normally in strain controlled test for example in soil, we will get peak value and lower ultimate value.
I'm going to print a polymerization material by PZT inkjet printer. So, will it accelerate the polymerization.
And the frequency is 5 kHz.
I am doing the UV cross-linking of isoprene in porous polymeric film. I know that the reaction is successful because after cross-linking film is not more soluble in organic solvents. However I need additional analytic method to prove it and desirably to calculate the % of cross-linking. Will be grateful for yours suggestion.
I want no agglomeration of metal particles in the PLA- chlorofrom solvent solution. I am using solvent casting method to make the composite and finding the composite is not electrically conductive.
I want the composite to be electrically conductive. Any suggestions
I am producing polymer porous membranes through non-solvent induced phase separation and I need to extend the length of finger-like structures. It seems like sponge-like structures are always formed on the side that is distant from the coagulant/polymer solution interface (the part of the nascent membrane in direct contact with the support).
What is the main parameter that affect the finger-like morphology and that can be controlled in order to promote the formation of this specific morphology only?
Additionally, which is the best analysis to reach a better understanding about the motivations and dynamics of finger-like formation process?
Will blending low concentration PVA to another high concentration, both have the same molecular weight, affect the swelling degree and hydrophilicity??
I have been looking for sometime without success on the web and in the literature for a curable polymer with an intermediate Youngs Modulus range:3MPa-500MPa.
Could anyone give me some suggestion on this?
I started a project that deals with the diffusion of gold nanoparticles through elastomeric films.
The films will be contacted with an aqueous solution of gold nanoparticles (5 nm in diameter) with a concentration of 50 ppm.
The elastomeric materials should be nitriles or silicone.
Is there a chance that elastomers will swell due to contact with water? Will the free volume created between the chains following the swelling be sufficient to let the 5 nm nanoparticles diffuse through the rubbery structure? If so, what techniques can I use to track / detect these nanoparticles inside the film structure.
I’m new in the field, please provide me your suggestions on the subject and thank you in advance.
I'm working on a project on drug delivery system. My team is researching on the conjugation of HPMC (a semi-synthesized polymer) and Zein (a protein extracted from corn). If anyone knows any information about how to conjugate those two (maybe make them become a micelle we suppose), please let me know. Thank you so much for your support. You are helping to create a new tool for advanced nanomedicine application in enhancing the dissolution rate of poorly water soluble drugs!
I have read in one journal that the blending of PMMA into PVDF will enhance the transparency of the membrane. Does anyone know what else we can do to produce transparent membranes?
I would like to calculate degree of crystallinity of nanocomposite masterbatch blend based on PLA/PHBV with L-CNC nucleating agent?
There is no bimodal endothermic peak..
PLA is Ingeo 3251D
I am new to XPS and my background is complete different (Electronic Engineering), so please excuse the naivity of my questions.
1. Lets say I have some XPS data of a polymeric material and I got C-1s and O-1s specta and I want to obtain the C1s at% relative to O1s. Peak fitting and literature indicate that there are multiple peaks in both related to chemical shifts. In the C1s there are peaks associated with C-O and C=O bonds. Does this mean that there have to be curves for these two also in the O1s spectra? Each of these peaks will be related to an at%, the three peaks from the C-1s (one being the C-c core line) and the two from the O-1s. What should be used to calculate the at% of C relative to O?
2. I want to compare the XPS spectra ontained from surfaces processed differently (temperature) to see how the at% of each element is affected. Should all peaks remain at the same B.E.? should their FWHM remain constant?
3. What is the best way of displaying survey spectra in a publication with regards to background subtraction? Should I use a linear background or a Shirley for the whole spectrum?
4. For the C-1s peak should I use a symmetric or assymetric curve?
5. How should one decide on the Gaussian/Lorentzian ratio?
I am using the ThermoFisher J-Alpha and the Advantage software.
Attached is a graph adopted from an article (ACS Nano, 2012, 6 (2), pp 1427–1437) which shows, increasing the number of layers in an Inverse opal film, leads to a decrease in the fraction of filled pores upon immersing in a liquid. Its based on percolation modeling.
I have been producing polycaprolactone fibers by means of electrospinning on an aluminium foil onto a metallic collector plate. After the polymer fibers have deposited on the foil, I remove it from the collector plate. How can I store these fibers? Until now I have been folding the aluminum foil and labelling it with the name and suitable parameters used to produce that particular fiber. . But I have realised that this is not the way one is supposed to follow as the fibers are fragile and folding the foil may break the fibers. What is other alternative solution? This would also help me carry the fibers from one lab to another.
I'm a trainee in a company which supplies space engines and we currently use an encapsulating epoxy resin (Stycast W67) with a low viscosity (200-300 cP) but a very long polymerization time (22 hours). We want to replace it in order to gain time.
Thanks for your answer.
You can see on the curve, the Young Modulus decrease. Is there a problem with our machine or it's due to material plasticization and matrix / fiber decohesion ?
How can I significantly increase the viscosity of a low molecular weight polyisobutylene binder (treacle consistency to soft solid consistency), in-situ, at room temperature but over several weeks? Slow cross-linking, but how? Any other ideas?
what is the best method could use to get a well-defined network to appear in SEM as I have prepared before and actually gave a good application in swelling and absorbance butt with low characterization confirmation.
Hey everyone, I am working on the project about to synthesize thermoplastic polyurethane as hot melt adhesive by using MDI and butane diol as hard segment and polycarbonate diol as macrodiol.
After first phase of research, I chose some formula to synthesize again. I did exactly the same procedure that I used to synthesize my previous samples. But it turns out with different properties, including thermal properties, crystalline structure and of course mechanical properties.
I know that maybe because of moisture impurity in MDI and other chemicals. I did even resynthesized over and over by using freshly open bottle of MDI and DMF (solvent), but the results still the same.
I also reviewed synthesis papers and handbook again and again to find out what I missed about synthesis method. However, I could not find anything.
Could anyone tell me about the factors that affect properties of TPU, please?
Thank you so much in advance.
Nylon 6 polymer is producing some high molecular weight polymer not suitable for Yarn spinning.The yarn breakages are observed .