Synthesis, Crystallization Kinetics, and Morphology of Novel Biodegradable Poly(butylene succinate-co-hexamethylene succinate) Copolyesters
Synthesis, Crystallization Kinetics, and Morphology of Novel Biodegradable Poly(butylene succinate-co-hexamethylene succinate) Copolyesters
复制标题
DOI：
10.1021/ie302817k
复制
发表时间：
2012-12
影响因子：
4.2
通讯作者：
Guyu Wang;Zhaobin Qiu
中科院分区：
文献类型：
--
作者：
Guyu Wang;Zhaobin Qiu
采用两步熔融缩聚法合成了可生物降解的聚丁二酸丁二醇酯（PS）和一系列PS共聚单体（HS）含量为14 ~ 35mol%的PS（BS-co-HS）。采用多种技术研究了不同HS组成的P（BS-co-HS）共聚酯的基本热行为、晶体结构、等温熔融结晶动力学、球晶形态和球晶生长，并与纯PBS进行了比较。相对于纯PBS，P（BS-co-HS）的玻璃化转变温度略微降低，而P（BS-co-HS）的熔点温度和平衡熔点温度随着HS组成的增加而显著降低。纯PBS和P（BS-co-HS）两者具有相同的晶体结构;然而，P（BS-co-HS）中的结晶度值比纯PES中的结晶度值略小。在较宽的结晶温度范围内研究了纯PBS和P（BS-co-HS）的等温熔融结晶动力学，并用Avrami方程进行了分析。实验结果表明，纯PBS和P（BS-co-HS）的结晶机理基本不变，但P（BS-co-HS）的结晶速率随HS组成和结晶温度的增加而降低。在较宽的结晶温度范围内，研究了纯PBS和P（BS-co-HS）的球晶形貌，发现P（BS-co-HS）的球晶生长速率随着HS含量的增加和结晶温度的升高而降低。
Biodegradable poly(butylene succinate) and a series of poly(butylene succinate-co- hexamethylene succinate) (P(BS-co-HS)) with hexamethylene succinate (HS) comonomer composition ranging from 14 to 35 mol % were prepared in the present work via a two-stage melt polycondensation method. Basic thermal behaviors, crystal structure, isothermal melt crystallization kinetics, and spherultic morphology and growth of P(BS-co-HS) copolyesters with different HS composition were studied in detail with various techniques and compared with those of neat PBS. With respect to neat PBS, the glass transition temperature of P(BS-co-HS) decreases slightly, while the melting point temperature and equilibrium melting point temperature of P(BS-co-HS) are reduced significantly with an increase in the HS composition. Both neat PBS and P(BS-co-HS) have the same crystal structure; however, the crystallinity values are slightly smaller in P(BS-co-HS) than in neat PES. The overall isothermal melt crystallization kinetics of neat PBS and P(BS-co-HS) were studied in a wide crystallization temperature range and analyzed by the Avrami equation. The experimental results indicate that the crystallization mechanism remains unchanged for both neat PBS and P(BS-co-HS); however, the overall crystallization rates of P(BS-co-HS) decrease with increasing HS composition and crystallization temperature. The spherulitic morphology of neat PBS and P(BS-co-HS) were also investigated in a wide crystallization temperature range; moreover, the spherulitic growth rates of P(BS-co-HS) also decrease with increasing HS content and crystallization temperature.