Miscibility and crystallization behavior of poly(butylene succinate) and poly(vinylidene fluoride) blends
Miscibility and crystallization behavior of poly(butylene succinate) and poly(vinylidene fluoride) blends
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DOI：
10.1295/polymj.30.327
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发表时间：
1998-01-01
期刊：
影响因子：
2.8
通讯作者：
Nishi, T
中科院分区：
文献类型：
--
作者：
Lee, JC;Tazawa, H;Nishi, T
用差示扫描量热法和光学显微镜研究了可生物降解的聚丁二酸丁二醇酯(PBSU)和聚偏氟乙烯(PVDF)共混物的相容性和结晶行为。从共混物的浊点观察发现，它们具有较低的临界溶液温度行为。PVDF的球晶随结晶时间呈线性增长，其生长速率随PBSU含量的增加而降低。由聚偏氟乙烯熔点下降得到的相互作用参数chi(12)为-0.139。然而，低T-m组分的PBSU的结晶和熔融行为与高T-m组分的PVDF有很大的不同：(I)PBSU的熔点下降幅度随降温速率的增大而变化；(Ii)对于给定的T-c，PBSU的熔点随PVDF含量的增加而升高，而通常的非晶/晶态共混物的熔点降低；(Iii)在一定的T-c下，PBSU的球晶生长速率G随PVDF含量的增加而略有下降，且PBSU的形态强烈依赖于结晶条件。对共混物中PBSU结晶行为的微观观察和Avrami分析表明，本文提出的PBSU所有这些独特的结晶行为都归因于在PBSU结晶发生的温度下存在PVDF晶体。
Miscibility and crystallization behavior of biodegradable poly(butylene succinate) (PBSU) and poly(vinylidene fluoride) (PVDF) blends, where two components are crystallizable have been investigated by differential scanning calorimerty and optical microscopy. From cloud point observation of the blends they are found to have lower critical solution temperature behavior. Spherulites of PVDF grew linearly with crystallization time and the growth rate decreased with increase in PBSU content. The interaction parameter chi(12), obtained from melting point depression of PVDF gave the value of -0.139. However, the crystallization and melting behavior of low-T-m component PBSU were quite different from that of high-T-m component PVDF: (i) the magnitude of the melting point depression of PBSU was changed strongly with cooling rate, (ii) for a given T-c, the melting point of PBSU increased with increase in PVDF content, in contrast to the decrease of the melting point in usual amorphous/crystalline blends, (iii) the spherulitic growth rate G of PBSU decreased very slightly with increase in PVDF content at a given T-c and the morphology of the PBSU were strongly dependent upon the crystallization condition. Microscopic observations and Avrami analysis of the crystallization of PBSU in the blends lead to the conclusion that all these unique crystallization behaviors of PBSU presented in this article are ascribed to the presence of PVDF crystals at the temperature where the crystallization of PBSU occurs.