聚酰胺6-聚乙二醇共聚物的合成与性能

采用阴离子聚合法合成了一系列聚酰胺6–聚乙二醇(PA6-PEG)嵌段共聚物,对己内酰胺/PEG投料比对共聚物热性能的影响进行重点研究,并分析此方法所得产物的结晶性能.通过傅里叶变换红外光谱、差示扫描量热仪、XRD等测试对产物结构、热性能及结晶性能进行了分析.研究结果表明:嵌段共聚物以酯基相连;PEG质量分数低于20%时,熔点呈规律性下降;高于20%时,共聚物的熔点波动性较大,己内酰胺/PEG的投料比不能决定共聚产物的熔点;己内酰胺/PEG配比相同时,PEG相对分子质量越低,共聚物的熔点也越低;通过阴离子聚合法更容易得到热力学非稳态的γ晶型产物.

Synthesis and Properties of PA6-PEG Copolymer

A series of PA6-PEG segmented copolymer was synthetized through anionic polymerization. The effect of caprolactam/PEG feeding ratio on thermal properties was focused on, and the performance of crystallization of the copoly- mer was also analyzed. The structure, thermal and crystalline properties of the products were studied with Fourier transform infrared spectroscopy, differential scanning calorimetry, XRD and other tests. The results showed that the products were segmented copolymers connected with ester bonds ; the melting point declines regularly when the PEG mass percentage was less than 20%. However it had big volatility when the percentage was more than 20%, which could indicate that the caprolac- tam/PEG ratio was not the decisive factor of the melting point. The melting point of the copolymer went down when the rela- tive molecular mass of PEG was low but the caprolactam/PEG ratio was the same. It was easier to get thermodynamically unsteady ~ polymorph products by anionic polymerization.