Yanhua Xu

7 Questions 3 Answers 0 Followers

Questions related from Yanhua Xu

How to make a cross-link polymer thin film? Does anyone could provide a protocol?

I prepare to let the triol monomer and diisocyanate react in a mold to make a cross-linked polyurethane thin film. Do you think the concentration of 1mol/L triol and diisocyanate in NMP solvent is...

12 December 2017 9,857 0 View

How to do solvent cast to make polymer film?

I made a polyurethane polymer with MW around 17k. And I dissolved them in 30% methnol/ 70% DCM solution with a concentration of 24mg polymer/ mL solution. And then I added the solution to the area...

11 November 2017 9,072 0 View

Characterization method for generation of CO2 gas real-time?

I would like to know whether there is some method to measure the amount of CO2 generated continuously with some equipment.

07 July 2017 8,801 3 View

What's the good method to rid of the tetrabutylammonium salt?

When I use Ph2SiHCl with InCl3 to selectively reduce the benzylic alcohol to methylene functional group without affecting the primary alcohol functional groups on the susbtrate, finally the...

04 April 2017 6,852 4 View

What's the condensation condition between diisocyanate and diol to make high molecular weigh linear polymer?

What is the appropriate concentration for the diol and isocyanate if want to get hight molecular polymer? And DMF, DMSO, NMP, which one is the good solvent for this polymerization? How long will...

03 March 2017 2,764 5 View

Why did my organo gel shrink during degradation study

I made one degradable cross-link polymer network(polyurethane polymer) and swell it with NMP solvent before doing degradation study. However, during the degradation study, I could observed that...

01 January 1970 9,063 1 View

Do you have some method for taking the MALDI for the polyurethane polymer

I made a polyurethane through condensation polymerization and I would like to make sure the repeating unit structure through MALDI. However, when I submitted the sample to the staff in the MS,...

01 January 1970 7,376 6 View