【作者】 李媛；

【导师】 赵京波；

【作者基本信息】 北京化工大学 ， 材料学， 2007， 硕士

【摘要】 聚酯酰胺作为生物降解材料已经引起了人们的广泛关注。但由于很难制备高分子量的聚酯酰胺,因而限制了大范围应用。使用化学扩链法可使聚酯酰胺分子量在短时间内迅速增大,具有效率高、便于连续生产等特.本研究中首先以1,4-丁二醇、己二酸和乙醇胺为原料合成了聚二酸丁二醇-co-己二酸乙醇胺)(PBEA)预聚体。研究发现,当丁二醇过量10～15%,选用氧化锌作为催化剂,在180～190℃下反应可以得到酸值小于1,分子量在1500-2000之间的聚酯酰胺预聚体。同时合成了二元活性酰胺类扩链剂对苯二甲酰双己内酰胺(TBC),并用来与PBEA预聚体进行扩链反应,合成出了具有高相对分子质量的聚酯酰胺。研究了预聚体相对分子质量、扩链剂/预聚体摩尔比、反应温度等因素,对扩链反应的响。在扩链温度为220℃,扩链剂/预聚体的摩尔比在1.1时,扩链效果最好,所得PBEA的特性粘度可达1.01dL/g。并采用GPC和DSC分别对扩链前后的聚酯酰胺的相对分子质量和熔点进行了表征,发现其相对分子质量成倍增加,而熔点则有所降低。此外,我们还对乙醇胺含量对聚酯酰胺(PBEA)的性能影响进行了初步探索。随着乙醇胺含量的增加,扩链后PBEA的分布指数也随之增加,加工性得到改善。当乙醇胺的含量小于10%时,乙醇胺的含量越少,熔越高；当乙醇胺的含量大于10%时,乙醇胺的含量越多,熔点越高。更多还原

【Abstract】 As one kind of biodegradable materials, Polyesteramides(PEA) has attracted extensive attentions in recent years. But the PEA of high molecular weight is hard to be prepared, so its widely application is limited. In this paper we provide a new method to increase the molecular weight of the polyesteramides in a fast reaction by a chain-extending reaction. Its advantages over conventional polycondensations include the fast reaction, high efficiency, and the easy work-up allowing the use of continuous production processes.In this study, the HO-terminated prepolymer of poly(butylene adipate-co-amidoethyl adipate)(PBEA) was prepared by the polycondensation of adipic acid with ethanolamine and excessive1,4-butanediol. The PBEA pre-polymers with acid number less than1and molecular weight between1500and2000were obtained at a high temperature (180～190℃) and under reduced pressure.10～15%excessive1,4-Butanediol was used and zinc oxide was chose as the best catalyst. At the same time, terephthaloyl biscaprolactamate(TBC) was synthesized and used as chain-extenders for HO-terminated PBEA prepolymer. PBEA with high molecular weight were obtained by the chain-extending reaction with TBC under reduced pressure in bulk state. The influencing factors on the chain-extending reaction were studied. At220℃and TBC/PBEA prepolymer molar ratio of1.1, the PBEA with intrinsic viscosity of1.01dL/g was obtained. The PBEA prepolymer and the chain-extended PBEA were also characterized by GPC and DSC spectra, respectively. The molecular weight of the PBEA after the chain extension was increased evidently but the melting point decreased.Moreover, the influence of the amount of aminoethanol to the properties of PBEA prepolymers and chain-extended PBEA were studied. The polydispersity of chain-extended PBEA were enhanced when the content of aminoethanol increased, so the material might be easier to be processed. When the content of aminoethanol is less than10%, the melting point of PBEA decreased as the content of aminoethanol increasing; when the content of aminoethanol is more than10%, the melting point of PBEA increased as the content of aminoethano increasing.更多还原