Why colour of DMF solvent changes to light brown colour on heating at above 130 C?

I was doing a blank test using DMF as solvent by heating it at 130 C. Within half an hour the colour of the solvent changes from colourless to brown colour. Is there any particular reason for...

08 September 2019 5,848 2 View

Does the integral ratio of exchangeable proptons and non-exchangeable protons matches?

While doing the NMR analyses of some polymer samples sometime I have observed that the integral ratios of some polar protons (Exchangeable protons) don't matches with the integral ratios of...

06 July 2018 1,413 7 View

How to neutralise a non polar molecule/polymer?

How a strong non polar molecule/polymer with having single or two amine/hydroxyl ions can be neutralised? Can it be done any desirable organic solvent with conc HCl? I had tried with water but...

04 May 2018 7,644 6 View

No title

09 October 2017 180 4 View

Why inhibitor are remain added in the monomer?

Most of the monomers are available with containing inhibitors! Is it just to avoid polymerization or something else?

06 July 2017 8,329 3 View

How shall I find or calculate the Gibb's free energy for a typical molecule as well as transition state from Spartan 14 wavefunction?

Hello everyone, I am using Spartan 14 wave function to calculate Gibb's free energy of a particular molecule as well as the transition state. But unfortunately, I am a bit unknown of how to use or...

04 May 2017 6,407 2 View

Polymer purification

Hi, guys! Today I am arriving with a new question. I am facing a problem while purifying a polymer. Then I doubt whether the polymer is getting purified! After synthesizing the polymer, I am...

04 May 2017 6,757 14 View

What will be the product of the 2nd reaction?

03 April 2017 8,476 8 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 is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View