Poly(lactic acid) (PLA), poly(hexylene succinate) (PHSu) and new block PLA-b-PHSu copolymers with mass ratios of 90/10 and 95/5 were synthesized. PHSu was chosen, as a proper agent to tune the crystallizability and to introduce biodegradability on PLA. Emphasis was given on crystallization behaviour, which is assessed by DSC, XRD and PLM. Also, to reveal any direct effects of the copolymer structure and composition on molecular mobility, TMDSC and BDS measurements were performed. FTIR was used as an accompanying technique. It was found that the slow crystallization rate of PLA becomes faster due to the presence of PHSu in the copolymers, while by XRD and DSC was proved that the degree of crystallinity decreases. Regarding molecular mobility of PLA at the presence of PHSu, the calorimetric (DSC) as well as the dynamic (α relaxation, BDS) glass transition, exhibit strong acceleration, weak enhancement in strength and suppressed cooperativity. These effects correlate well with the progressive decrease of molar mass in copolymers by increasing PHSu content. Local dynamics of PLA is not affected by PHSu, as expected.

合成了聚乳酸（PLA），聚己二酸丁二酯（PHSu）和质量比为90/10和95/5的新型嵌段PLA-b-PHSu共聚物。选择PHSu作为调节结晶度并在PLA上引入生物降解性的合适试剂。通过DSC，XRD和PLM评估了结晶行为。另外，为了揭示共聚物结构和组成对分子迁移率的任何直接影响，进行了TMDSC和BDS测量。FTIR被用作伴随技术。发现由于共聚物中PHSu的存在，PLA的缓慢结晶速率变得更快，而通过XRD和DSC证明结晶度降低。关于PHSu存在时PLA的分子迁移率，量热（DSC）以及动态（α弛豫，BDS）玻璃化转变，表现出强的加速性，强度的弱增强和抑制的协同性。这些效果与通过增加PHSu含量逐渐降低共聚物中的摩尔质量密切相关。正如预期的那样，PLA的局部动力学不受PHSu的影响。