中文摘要：

采用丁二酸（SA）、1，4-丁二醇（BD）、2，2-二甲基丁二酸（2MSA）合成了一系列聚丁二酸／2，2-二甲基丁二酸丁二酯共聚物（PBS-2M），利用DSC、^1H—NMR和X射线分析等测试手段对共聚物组成、热力学性能、结晶性能、等温结晶行为进行了研究。结果表明，2，2-二甲基丁二酸共聚单元的引入显著改变了聚丁二酸丁二酯（PBS）的热学性能，利用Hoffman-Week曲线得到的共聚物平衡熔点随共聚组分含量的增加显著降低，玻璃化转变温度亦有所降低，结晶熔点则符合无规共聚物的Flory方程。此外，利用Avrami方程对均聚物PBS以及共聚物PBS-2M-20分别进行了等温结晶行为研究，结果表明，共聚使结晶速率降低，PBS和PBS-2M-20的Avrami指数分别介于2．8～3．0和2．6～2．8之间，结晶方式为三维生长异相成核，X射线分析证明共聚不影响晶体结构。

英文摘要：

A series of polyesters, poly （hutylene succinate-co-butylene 2, 2-dimethyl succinate） （PBS-2M）, were obtained from the polycondensation of succinate and/or 2,2-dimethyl succinate with 1,4-butanediol. The compositions and physical properties of the resulted homo- and co- polyesters were investigated by ^1H-NMR, differential scanning calorimetry, and X-ray diffraction. The results suggested that the introduction of comonomer containing 2,2-dimethyl side-group led to a change in thermal properties and crystallization behavior. The equilibrium melting temperature obtained by the Hoffman-Weeks plot significantly decreased with increasing concentration of comonomers containing two symmetrical methyl side-groups. Furthermore, Avrami method was used to ranalyze the kinetics of isothermal crystallization of PBS and PBS-2M-20. The Avrami exponents estimated using Avrami plots, ranging from 2. 8 to 3. 0 for PBS and 2. 6 to 2. 8 for PBS-2M-20, indicating that the mechanism of crystallization for both homo- and co-polyester was a tri-dimensional growth with heterogeneous nucleation. Meanwhile, X-ray diffraction showed that there was almost no effect of the 2,2-dimethyl succinate unit on the crystal structure.