How will secondary alcohols and carboxylic acids react with triphosgene during a polymerization?

I am performing solution polymerization of diols (PLLA diols have a secondary alcohols, and can also have trace carboxylic acid endgroups) using triphosgene. I am continuing to have problems with...

08 September 2014 8,565 1 View

How will carboxylic acids affect my phosgenation of diols?

So I am taking diols, dissolving them into chloroform and pyridine, and adding a solution of chloroform/triphosgene to the reaction over a period of time. I am failing to get a high number average...

07 August 2014 2,008 5 View

Does anyone have any experience with triphosgene making anhydrides?

07 August 2014 8,401 2 View

What causes the exothermic reaction that occurs when mixing triethlyamine with a polycarbonate?

So I am having trouble with the solubilty of my polycarbonate. We make these using diols and triphosgene in chloroform solution with a large molar excess of pyridine. I wanted to know if using TEA...

07 August 2014 7,501 7 View

Does anyone have any good ideas on how to raise the Mn of a polycarbonate?

The purity of my monomers are 99.7% and 99.8%. We've tried mixing the solution for as long as 6 days to allow for every free diol to react. I've also tried monomer washes with acetone to try to...

31 December 2013 1,344 6 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View