How to remove the KOH from ethanolic etherification without using extraction method?

Etherification was carried out between aromatic -OH group and alkyl chloride in the presence of ethanolic KOH. The precursor is a bulky dye compound that consists of an aromatic -OH group and an...

04 May 2019 2,639 4 View

Why this polymeric DSC have three peaks and no dip?

The sample is polymer and I sent this sample for analysis. The obtained DSC curve was kind of unexpected. The curve looks different from what I have studied and seen before. 1. Why the glass...

31 December 2017 8,521 9 View

Is it possible to get the higher molecular weight(Mw) first before getting the lower Mw during the Soxhlet extraction of the polymer?

I tried to extract the polymer through Soxhlet extraction. According to some references, the sequence for the organic solvents is methanol, acetone, hexane, toluene, and chloroform. The...

11 December 2017 4,920 3 View

Can I use cellulose Soxhlet thimble instead of glass fibre thimble for the Soxhlet extraction in polymerization?

I read that most previous studies used glass fibre thimble instead of the cellulose thimble. The solvents are methanol, acetone, hexane, toluene, dichloromethane, chloroform. If I use cellulose...

04 May 2017 1,408 3 View

Why the entire FTIR spectrum shifted to the left after dimerization?

01 February 2017 9,964 3 View

Which is the suitable NMR solvent for compound that does not dissolve in DMSO-d6 and CDCl3?

I would like to scan NMR for a compound name : 4,4'-dibromo-2,2'-diaminobiphenyl. According to some papers, the NMR solvents used are either CDCl3 or DMSO-d6. However, when I try to dissolve my...

31 December 2016 2,950 10 View

What is the purpose of adding HBr in bromination? Hbr/Br2 system.

Is the HBr was added to prevent the formation of HBr as by-product from Br2 during the reaction (minimize the wastage of Br2)? And to move the reaction forwards faster?

11 December 2016 4,878 7 View

Why DMSO is used even though the compounds are soluble in DMF?

I get to know that the solvent DMF is technically similar to the DMSO for organic synthesis, just that DMSO can dissolve more compounds than the DMF. Is there any special reason that DMSO is used...

10 November 2016 6,668 7 View

Can the commercial reusable dry ice packs be used as dry ice in my experiment?

I have a few packs of reusable dry ice-gel packs. They are sent along with the chemicals in a box for keeping the chemicals cool. Is it possible for me to use that "gel" as dry ice to reach the...

09 October 2016 9,004 5 View

How can I activate the copper powder?

I have one bottle of 50 mesh copper powder, 96%. How can I get activated copper powder from that? Any suggestions? Thank you very much.

09 October 2016 6,115 3 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

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View