Miscible crystalline/crystalline polymer blends of poly(vinylidene fluoride) and poly(butylene succinate-co-butylene adipate):: Spherulitic morphologies and crystallization kinetics
Miscible crystalline/crystalline polymer blends of poly(vinylidene fluoride) and poly(butylene succinate-co-butylene adipate):: Spherulitic morphologies and crystallization kinetics
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DOI：
10.1021/ma070255y
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发表时间：
2007-07-10
期刊：
影响因子：
5.5
通讯作者：
Yang, Wantai
中科院分区：
文献类型：
--
作者：
Qiu, Zhaobin;Yan, Chunzhu;Yang, Wantai
采用偏光显微镜（POM）、差示扫描量热仪（DSC）和广角X射线衍射仪（WAXD）研究了聚偏氟乙烯（PVDF）/聚丁二酸丁二醇酯-己二酸丁二醇酯（PBSA）共混物的球晶形态和结晶动力学。PVDF和PBSA在共混物中分别结晶。对于高熔点组分PVDF，其结晶机理没有改变，但随着结晶温度的升高和PBSA含量的增加，PVDF的球晶生长速率和总结晶速率均降低。低熔点组分PBSA的球晶形态和结晶动力学不仅受共混物组成和结晶温度的影响，而且还受高熔点组分PVDF在共混物中的晶体的强烈影响。PBSA球晶在PVDF球晶的基质中成核并继续生长，直到撞击在其他PBSA球晶上。与纯PBSA相比，PBSA在共混物中的总体结晶速率加快，尽管对于富含PBSA的共混物的共混物组合物，其随着结晶温度的升高而降低。预先存在的PVDF晶体的存在对PBSA的整体结晶显示出两种相反的影响，即，增强的成核能力和较慢的晶体生长速率。
Spherulitic morphologies and overall crystallization kinetics of miscible poly(vinylidene fluoride) (PVDF)/poly(butylene succinate-co-butylene adipate) (PBSA) blends were studied by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). PVDF and PBSA crystallize separately in the blends. For the high-T-m component PVDF, the crystallization mechanism does not change, while both the spherulitic growth rate and the overall crystallization rate of PVDF decrease with increasing crystallization temperature and the PBSA content in the blends. Much more attention has been directed to the spherulitic morphologies and overall crystallization kinetics of the low-T-m component PBSA, which are affected not only by blend composition and crystallization temperature but also strongly by the preexisting crystals of the high-T-m component PVDF in the blends. PBSA spherulites nucleate in the matrix of the PVDF spherulites and continue to grow until impinging on other PBSA spherulites. The overall crystallization rate of PBSA is accelerated in the blends compared with that of neat PBSA, which reduces with increasing crystallization temperature despite blend composition for the PBSA-rich blends. The presence of the preexisting PVDF crystals shows two opposite effects on the overall crystallization of PBSA, i.e., enhanced nucleation ability and slower crystal growth rates.