Effects of melt annealing on the miscibility and crystallization of poly(butylene succinate)/poly(ethylene succinate) blends
Effects of melt annealing on the miscibility and crystallization of poly(butylene succinate)/poly(ethylene succinate) blends
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DOI：
10.1038/pj.2014.11
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发表时间：
2014-07
期刊：
影响因子：
2.8
通讯作者：
Toshiyuki Kataoka;K. Hiramoto;Hideo Kurihara;T. Ikehara
中科院分区：
文献类型：
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作者：
Toshiyuki Kataoka;K. Hiramoto;Hideo Kurihara;T. Ikehara
本文讨论了用简单的熔融退火方法增强聚丁二酸丁二烯和聚丁二酸乙烯共混物的混相性、结晶过程和特征相分离结构的形成。凝胶渗透色谱和差示扫描量热测量表明，退火过程导致PBS和PES之间发生酯交换反应，形成PBS - PES共聚酯。未退火的共混物表现出相分离的熔体，其成分分别结晶。未退火共混物的相分离熔体在富pes相与玻璃基板之间形成了富pbs层。相反，混相退火共混物的结晶过程不同。第一个过程是连续结晶，在均匀熔体中形成PBS球晶，在PBS球晶内部形成PES球晶。第二个过程包括熔融和PES球晶向PBS球晶的穿透生长两种组分的同时成核。
We discuss the enhancement in miscibility of crystalline/crystalline blends of poly (butylene succinate) and poly (ethylene succinate)(PBS/PES) by simple melt annealing, their crystallization process and the formation of characteristic phase-separated structure. The immiscible PBS/PES blends changed into miscible blends when annealed at 150 C. Gel permeation chromatography and differential scanning calorimetry measurements suggested that the annealing process caused transesterification between the PBS and PES, resulting in the formation of PBS–PES copolyesters. The unannealed blends exhibited phase-separated melts with constituents that crystallized separately. A PBS-rich layer was formed between the PES-rich phase and the glass substrate from the phase-separated melts of the unannealed blends. In contrast, the miscible annealed blends crystallized by two distinct processes. The first process, successive crystallization, involved PBS spherulite formation in the homogeneous melt and PES spherulite nucleation inside the PBS spherulites. The second process involved the simultaneous nucleation of both components from the melt and penetrating growth of the PES spherulites into the PBS spherulites.