Stille coupling reaction. Sn(Bu)3 or Sn(Me)3?

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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 2,729 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 8,614 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 5,006 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 1,498 3 View

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

2,5-dibromonitrobenzene (monomer) 4,4’-dibromo-2,2’-dinitrobiphenyl (dimer) The FTIR spectra for these two are basically the same. But the dimer spectrum shifted to the left. Isn't that when the...

01 February 2017 10,099 3 View

How can I get freshly powdered KOH from commercially bought KOH pallets?

The KOH absorb atmospheric moisture quite fast when I manually powdered it.

01 February 2017 4,004 4 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 3,035 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 4,960 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 6,784 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 9,082 5 View

Adhesion strength of coating?

How can I determine a good adhesion strength range for coatings on polymer surfaces, such as DLC on polymer substrates? Is there a specific threshold for adhesion strength (from T-peel tests)...

10 August 2024 942 3 View

How to increase simulation box size?

We intend to study the interaction between peptides and polymer (like PP, PE and PS) through MD simulations using Martini force fields ( Martini 2 for PP and Martini 3 for PE, PS). We have...

08 August 2024 4,842 0 View

How to heat polymer for about 130° without oil bath ?

is there any other way to heat a polymer evenly other than oil bath if so what are those and how to use it

06 August 2024 947 1 View

Can't spin-orbit coupling(SOC) be included in optical properties calculation in CASTEP?

I am currently using CASTEP version 2020. When I want to run optical properties calculations with spin-orbit coupling(SOC), I encounter the following error in a pop-up window before the job gets...

02 August 2024 2,890 0 View

How to explain the different interaction between soluble and insoluble polymer in water?

Hello everyone, I am try to understand the differences interaction between insoluble and soluble polymers in water with metal ions and how theit charge density (of metal ions) affect the interaction.

29 July 2024 6,350 3 View

Why is it not common to see similar pairs in polymer sliding pairs?

If the pairs are similar, will it reduce the adhesion due to electric charges?

29 July 2024 3,185 2 View

HAs anyone used TGA to find activation enegy of water evaporation?

I have different polymer solutions and I hypothesize that water molecules are retained based on the water-polymer interactions, so the amount of free water is less to intercat with drug tablet....

28 July 2024 9,545 6 View

How to separate the stereoisomers compond in reaction mixture?

how to separate the organic reaction stereo isomers compounds are separate from the reaction mixture any simple methods are available

23 July 2024 8,025 4 View

Interpreting ATR-FTIR Spectra for Microplastics Research?

Hello everyone, I am currently pursuing a PhD in Environmental Engineering with a focus on microplastic studies. My background is in Civil Engineering, and I am relatively new to working with...

18 July 2024 7,258 3 View

How does surface energy affects the solidification of polymer?

Dear All, I would like to ask about the relation between the surface energy and solidification of polymer. If we apply a chemical treatment such as NaOh solution or silane treatment on the...

17 July 2024 190 3 View