Synthesis and enzymatic degradability of an aliphatic/aromatic block copolyester: poly(butylene succinate)-multi-poly(butylene terephthalate)
Synthesis and enzymatic degradability of an aliphatic/aromatic block copolyester: poly(butylene succinate)-multi-poly(butylene terephthalate)
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DOI：
10.1007/s13233-017-5011-2
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发表时间：
2017-01
影响因子：
2.4
通讯作者：
Chan Woo Lee;Mayumi Akashi;Y. Kimura;Kazunari Masutani
中科院分区：
文献类型：
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作者：
Chan Woo Lee;Mayumi Akashi;Y. Kimura;Kazunari Masutani
一种新型多嵌段共聚酯，聚丁二酸丁二醇酯-多聚对苯二甲酸丁二醇酯（m-PBST），是通过预成型的聚丁二酸丁二醇酯（PBS）和聚对苯二甲酸丁二醇酯（PBT）的熔体共混物的熔融/固界面共缩聚合成的。在该共缩聚中，反应温度保持在PBS和PBT的熔融温度(Tm)之间，以使低熔点PBS(熔体)与高熔点PBT(固体)有效地连接。所得 m-PBST 的琥珀酸含量和持久率 (r) 受到 PBS 和 PBT 熔融共混时间的影响，其中诱导了它们的链扰乱反应。当 PBS 与 PBT 的比例为 2:1 并适当调整共混时间时，每个聚合物链的平均嵌段数变为最大 (7.3)。由于嵌段共聚物结构，m-PBST 表现出的热塑性性能应该介于 PBT 和 PBS 之间，并且与相应的 PBS/PBT 无规共聚物完全不同。 m-PBST 的酶降解性也通过使用源自洋葱假单胞菌的脂肪酶 PS® 得到了证实。因此，m-PBST作为一种具有优异软硬平衡和韧性的新型结构材料应该具有潜在的应用前景。
A novel multi-block copolyester, poly(butylene succinate)-multi-poly(butylene terephthalate) (m-PBST), was synthesized by the melt/solid interfacial co-polycondensation of a melt-blend of poly(butylene succinate) (PBS) and poly(butylene terephthalate) (PBT) that had been pre-formed. In this co-polycondensation, the reaction temperature was kept between the melting temperatures (Tm) of PBS and PBT so as for the low-melting PBS (melt) to be effectively connected with the high-melting PBT (solid). The succinate content and persistence ratio (r) of the resulting m-PBST were affected by the time of melt-blending of PBS and PBT where their chain-scrambling reaction was induced. The average block number per polymer chain became the largest (7.3) when the blending time was properly adjusted with a PBS to PBT ratio of 2:1. Owing to the block copolymer structure, m-PBST showed thermoplastic properties that should be intermediate between those of PBT and PBS and completely different from those of the corresponding PBS/PBT random copolymer. The enzymatic degradability of m-PBST was also confirmed by the use of Lipase PS® originated fromPseudomonas cepacia. Consequently, m-PBST ought to have potential applications as a new structural material with excellent soft/hard balance and toughness.