Isothermal Crystallization Kinetics, Morphology, and Dynamic Mechanical Properties of Biodegradable Poly(ε-caprolactone) and Octavinyl-Polyhedral Oligomeric Silsesquioxanes Nanocomposites
Isothermal Crystallization Kinetics, Morphology, and Dynamic Mechanical Properties of Biodegradable Poly(ε-caprolactone) and Octavinyl-Polyhedral Oligomeric Silsesquioxanes Nanocomposites
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DOI：
10.1021/ie202802d
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发表时间：
2012-02-22
影响因子：
4.2
通讯作者：
Qiu, Zhaobin
中科院分区：
文献类型：
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作者：
Guan, Wen;Qiu, Zhaobin
在这项工作中，通过溶液浇铸方法在低 ovi-POSS 负载量下制备了可生物降解的聚（ε-己内酯）（PCL）和八乙烯基多面体低聚倍半硅氧烷（ovi-POSS）纳米复合材料。扫描电子显微镜观察不仅显示了ovi-POSS在PCL基质中的精细分散，而且还显示出结晶。采用各种技术研究了纯 PCL 及其纳米复合材料的整体等温熔融结晶动力学、球晶形态、晶体结构和动态力学性能。 ovi-POSS 的存在提高了纳米复合材料中 PCL 的整体等温熔融结晶速率；然而，尽管有ovi-POSS负载，PCL的结晶机制和晶体结构保持不变。此外，纳米复合材料的储能模量相对于纯 PCL 显着增强，而玻璃化转变温度无论是否存在 ovi-POSS，都会略有变化。
Biodegradable poly(epsilon-caprolactone) (PCL) and octavinyl-polyhedral oligomeric silsesquioxanes (ovi-POSS) nanocomposites were prepared at low ovi-POSS loadings via a solution casting method in this work. Scanning electron microscopy observation reveals not only the fine dispersion but also the crystallization of ovi-POSS in the PCL matrix. The overall isothermal melt crystallization kinetics, spherulitic morphology, crystal structure, and dynamic mechanical properties of neat PCL and its nanocomposites were studied with various techniques. The presence of ovi-POSS has enhanced the overall isothermal melt crystallization rates of PCL in the nanocomposites; however, the crystallization mechanism and crystal structure of PCL remain unchanged despite the ovi-POSS loading. In addition, the storage modulus of the nanocomposites has been enhanced significantly relative to neat PCL, while the glass transition temperature varies slightly irrespective of the presence of ovi-POSS.