A kind of crystalline n-substituted polythiocarbamate and its preparation method

Abstract

The invention belongs to the technical field of polymer materials, and in particular relates to a crystalline N-substituted polythiourethane and a preparation method thereof. The present invention uses carbon oxysulfide and N-substituted aziridine as raw materials to obtain crystallized N-substituted polythiourethane by copolymerization under bulk or solvent conditions. The method developed by the present invention has the following advantages: it can react itself without a catalyst; the raw materials are cheap and easy to obtain, and the synthesis is simple, without using toxic mercapto compounds and isocyanate compounds in the traditional system; the prepared N-substituted polythiocarbamic acid The main chain structure of the ester polymer is clear and has a fully alternating structure; the polymer is crystalline and has excellent thermal stability. The polymer is easy to recycle and reuse, and can be thermally degraded into a five-membered ring N-substituted thiocarbamate with application value, without any additional impurities or volatile pollutants, and is an environmentally friendly Recyclable specialty polymers.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a crystalline N-substituted polythiourethane and a preparation method thereof. Background technique [0002] Polythiourethanes are widely used in optical materials, coatings, and medical materials due to their enhanced properties such as refractive index, adhesive strength, biocompatibility, and mechanical properties. In existing synthetic methods, such as patents (CN1171924C; CN1405198A; CN105229046A), polythiourethanes can be synthesized by a base-catalyzed nucleophilic addition reaction of dithiols to diisocyanates. Obviously, raw material dithiol and diisocyanate are highly toxic, and their chemical properties are unstable in addition, and storage and use cost are higher, and these factors are all unfavorable for synthesizing polythiourethane. In addition, the polyaddition reaction of bifunctional five-membered cyclic dithiocarbonate and diamine can also...

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Problems solved by technology

So far, there has been no report on the preparation of crystalline polythiourethane by carbon oxysulfide

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