硬段侧链含有双季铵盐的聚氨酯的合成及表征

为了解决单铵盐抗菌聚氨酯存在的对革兰氏阴性细菌抗菌性能差、扩链剂用量大的问题,合成了硬段侧链含有双季铵盐的系列聚氨酯。用GPC和核磁共振研究了材料的分子量和结构,表明双季铵盐扩链剂成功引入了聚氨酯主链。通过傅立叶变换红外光谱(FTIR)和差热分析(DSC)研究了材料的本体微相分离结构。发现,随着双季铵盐含量的增大,材料的软段和硬段之间的氢键结合增加,微相分离程度降低。

Synthesis and Characterization of Polyurethane with Pendent Quaternary Ammonium Salts

Polyurethanes with pedant quaternary ammonium salts(QAS) have been shown potent antimicrobial properties against gram-positive bacteria but less sensitive to gram-negative ones.Besides,due to using a large amount of QAS chain extenders,Polyurethanes with pedant QAS have been proven to be high water adsorption and even water soluble.In order to solve the two problems mentioned above of biocidal polyurethane with QAS groups,Polyurethanes were synthesized from the chain extender with pendant bis-ammonium salts and verified by GPC and 1HNMR.The degree of microphase separation of sythesized polyurethans was characterized by FTIR and DSC.It was found that the phase separation of the two sets of the polyurethanes decreased with increasing the amounts of bis-ammonium salts chain extenders as proven by DSC and FTIR.