Polymer (60/40) is made with traditional emulsion polymerization (KPS, SDS). I need to dissolve polymer in dmf or dmso for n-alkylation reaction. I found a publication showing how to make that polymer and dissolve it using 5% DMF. But dissolving is not reproducible, it form chunkies or fibers. I can easely make 0,3% solution (heated up to 100C, 24h). But cannot make 5% DMF. Tryied with: sonication bath or milling particles without positive result. Also tryied with variety of solvents: THF, Toluene, DCM, Acetone, without better results.
What can be the problem? How to get rid of it?
В ходе радикальной сополимеризации возможна передача цепи на полимер, в частности на хлор. Тогда полимер получится разветвленный или даже сшитый. Если в тетрагидрофуране полимер не растворяется, то вы точно получили сшитый полимер.
Some other people also mention it can be too high MW. What Should I do to avoid that problem?
I use conditions from: DOI: 10.1039/c5ra17839h
Dear Dominik Trzmielewski! A chain transfer agent is used to control the molecular weight of the polymer during the polymerization reaction. It is a chlorine-containing substance, such as the carbon tetrachloride. The more it is, the lower the molecular weight. There is also a technique for to prevent the polymer from cross-linking. See my papers.
Sorry I cannot read your language, but really want to know how to make it more soluble in dmf. You suggest using eg. Dichloromethane. How much to add and to what setup use it?