Sanjiban Chakraborty

4 Questions 6 Answers 0 Followers

Questions related from Sanjiban Chakraborty

Which type of material besides metal sheet can withstand 20,000 psi pressure in the compression molding without ruining the surface?

I am trying to compress some optical quality plastic in compression molding machine in between stainless steel plates at 20,000 psi. However the metal is leaving some impression on the pressed...

01 September 2021 3,411 3 View

How to eliminate the yellow color of aromatic polyurethanes?

I have made polyurethanes from methylene diphenyl diisocyanate (MDI). There is no moisture in the reaction. The final polymer is faint yellow or brown even when I used a sterically hindered...

29 May 2020 6,581 2 View

How to make a water sensitive hydrophobic monomer miscible with a hydrophilic monomer w/o using any solvent?

I am planning to run a polyurethane reaction which has two monomers: one is a diisocyanate and the other is a diol. However the diisocyanate is not forming a homogenous mixture with the diol. The...

27 September 2019 7,813 3 View

Does anybody has a solution regarding the decrease in transparency of polymer after milling inside liquid nitrogen?

I have a rigid polymer which needs to be freeze milled and sieved through 100 mesh. I added the liquid nitrogen inside the stainless steel vial of the polymer containing polymer and milled. After...

19 January 2019 3,200 6 View