【摘要】 双酰异硫氰与二元胺在丙酮溶液中室温下进行聚合可获得綫型高聚物——聚酰硫脲。对这些高聚物的结构与性能作了初步的探讨与观察。 志谢:红外光谱由中国科学院兰州化学物理研究所;紫外光谱和X射线衍射由西北地貭局中心实验室;元素分析由兰州大学有机微量分析室代做;甘肃工业大学胡宗礼、刘贤增两同志协助进行部分实验工作,均此致谢。更多还原

【Abstract】 Diacylisothiocyanates reacted readily with diamines to form linear polymers of acyl-thioureas with the following repeating unit:[R’NHCSNHCORCONHCSNH]mTen of such polyacylthioureas have been synthesized through the reactions of adipic, azelaic and terephthalic diisothiocyanates with hydrazine, ethylenediamine, hexamethylene-diamine, p-phenylenediamine and benzidine respectively. The structure of the polymers obtained have been confirmed by elementary analysis, degradation examination, ultraviolet as well as infra-red spectroscopy. These polymers were coloured (yellow to orange) powder, sparingly soluble in common organic solvents but readily soluble in dimethylformamide and cold cone, sulfuric acid. The x-ray diffraction patterns showed that these polymers possessed fair crystallinity. The softening points of the polymers decreased with increasing length of the aliphatic carbon-chain and increased when benzene nuclei were introduced into the chain. Four out of these polymers possessed softening points higher than 300℃.更多还原