How to determine the molecular formula of the mixture synthesized?

In Pakistan, every year 5,000 babies are born with Thalassemia. Pakistan is among the highest thalassemia burden countries in the world. The commonly quoted figure for the country is 100,000 transfusion-dependent thalassemia patients.

What is the ratio in your country? Is there any awareness program run by government?

Regards.

We currently use a viscometer to determine the relative viscosity of our product, however theoretically I think that we could calculate the relative viscosity from the measured amount of amino end groups in our polymer product.

The viscosity is linked to the amount of AEGs because this determines the (average) chain length of the polymer. And the chain length is linked to the viscosity.

I'm struggling to find a formula to calculate this, anyone who has experience with this?

Dear colleagues,

I would like to know how to determine the amount of functional groups, here carboxyl groups, in PAA (100 kDa). I would guess by acid-base titration.

In detail I would prepare a NaOH standard solution (~ 0.05 M) with potassium biphthalate as a standard. Furthermore I would prepare a HCl standard solution (~ 0.05 M) also with potassium biphthalate. The polymer would be dissolved in the NaOH standard solution. After that the excess NaOH in the solution would be titrated with HCl standard solution with phenolphthalein as an indicator.

The reason is, that I would like to repeat the same experiment with my hydrophobically modified PAA (HM-PAA) in order to know the amount of carboxyl groups before and after the reaction and the fraction of modification. Apart from that I would like to control the deprotonation of my HM-PAA in order to make it water soluble. An example: How much NaOH do I have to add in order to deprotonate 10% of HM-PAAs' carboxyl groups.

Is it possible to proceed according to the mentioned procedure and which polymer concentration shall I use when dissolving.

Thanks in advance.

Cihan

to make polyurethane,l react PEG 200 & TDI in a ratio of 1 to 2 at 70 Celsius, but the mixture becomes very hard & plastic,l can't add methacrylate, What is the reason for the hardening of the mixture in the first step?

Can someone tell me how can I separate plastic and metal object without using image processing method ?

Dear community,

what are the simplest methods to test the degree of grafting and the length/degree of polymerisation of the side chains in grafted polymers? Grafted side chains are polyesters to hydroxyl groups.

Hello everyone,

I am doing oscillatory analysis with the DHR3 by TA instruments. The Orchestrator Software has a tool that allows me to determine molecular weight distribution. However, I have yet to gain experience with that tool and would like to know if it works for the polymer I am using a polyacrylamide.

Could someone share some tips?

Thank you very much

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I tried to find these answers through my research article.

Dear Researchers :

I have this question and I have an hypothesis:

Why Natural HDPE, when extruded at temperatures about 100 °C (around) it has a white (but pale white), and then when the polymer cools down it color turns between white an yellow.

I understand that this phenomenon it is a general case of all LLDPE, LDPE and HDPE , and in all fabrication processes : Extrusion, injection, molding, pressing, etc.

So this is fundamentally, a chemical characteristic of the material ...

It has to do with a change in the Oxygen concentration in the material ?

Thank you all in advance,

Best Regards !