Miscibility and crystallization behavior of biodegradable blends of two aliphatic polyesters. Poly(butylene succinate) and Poly(ε-caprolactone)
Miscibility and crystallization behavior of biodegradable blends of two aliphatic polyesters. Poly(butylene succinate) and Poly(ε-caprolactone)
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DOI：
10.1016/j.polymer.2003.10.013
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发表时间：
2003-12
期刊：
影响因子：
4.6
通讯作者：
Zhaobin Qiu;M. Komura;T. Ikehara;T. Nishi
中科院分区：
文献类型：
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作者：
Zhaobin Qiu;M. Komura;T. Ikehara;T. Nishi
将聚丁二酸丁二醇酯(PBSU)和聚己内酯(ε)共混制得可生物降解的化学合成半晶聚酯，其比例为80/20~20/80。用差示扫描量热法和光学显微镜研究了PBSU/PCL共混物的相容性和结晶行为。实验结果表明，PBSU与PCL是不相容的，其玻璃化转变温度和两相熔体的组成无关。但在一定降温速率下熔体结晶过程中，共混物中PBSU的结晶峰温度随PCL的增加而略有下降，而PCL的结晶峰温度随PBSU的增加先升高后降低。此外，对于给定的共混物组成，随着冷却速度的增加，PBSU和PCL的结晶峰温度都向低温方向移动。PBSU和PCL在完全结晶冷却后均出现双熔融峰或有肩峰的主熔融峰，属于熔融-再结晶机制。研究发现，PBSU/PCL共混物的后续熔融行为明显受共混物组成和冷却速度的影响。
Poly(butylene succinate) (PBSU) and poly(ε-caprolactone) (PCL) blends, both biodegradable chemosynthetic semicrystalline polyesters, were prepared with the ratio of PBSU/PCL ranging from 80/20 to 20/80 by co-dissolving the two polyesters in chloroform and casting the mixture. The miscibility and crystallization behavior of PBSU/PCL blends were investigated by differential scanning calorimetry and optical microscopy. Experimental results indicated that PBSU was immiscible with PCL as evidenced by the composition independent glass transition temperature and the biphasic melt. However, during the crystallization from the melt at a given cooling rate, the crystallization peak temperature of PBSU in the blends decreased slightly with the increase of PCL, while that of PCL in the blends first increased and then decreased with the increase of PBSU. Moreover, both the crystallization peak temperature of PBSU and PCL shifted to the low temperature range with the increase of the cooling rate for a given blend composition. Double melting peaks or one main melting peak with a shoulder were found for both PBSU and PCL after the complete crystallization cooled from the melt, and were ascribed to the melting–recrystallization mechanism. It was found that the subsequent melting behavior of PBSU/PCL blends was influenced apparently by the blend composition and the cooling rate used.