Effect of Low Thermally Reduced Graphene Loadings on the Crystallization Kinetics and Morphology of Biodegradable Poly(3-hydroxybutyrate)
Effect of Low Thermally Reduced Graphene Loadings on the Crystallization Kinetics and Morphology of Biodegradable Poly(3-hydroxybutyrate)
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DOI：
10.1021/ie3018466
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发表时间：
2012-10-24
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：
Jing, Xiangjin;Qiu, Zhaobin
在低TRG负载下，通过溶液和混凝法制备了可生物降解的聚3-羟基丁酸酯（PHB）和热还原石墨烯（TRG）纳米复合材料。采用多种技术研究了TRG对PHB/TRG纳米复合材料中PHB的晶体结构、球晶形貌、非等温熔融结晶行为和等温熔融结晶动力学的影响。结果表明，在PHB/TRG纳米复合材料中，TRG没有改变PHB的晶体结构，但明显增加了PHB球晶的成核密度。此外，由于TRG的高效成核剂作用，PHB在纳米复合材料中的非等温和等温熔融结晶都得到了显著增强。此外，利用Avrami方程分析了纯PHB和PHB/TRG纳米复合材料的等温熔融结晶动力学。PHB的整体等温熔融结晶速率随着结晶温度的降低和复合材料中TRG用量的增加而增加；然而，无论结晶温度和TRG负载如何，结晶机制都保持不变。
Biodegradable poly(3-hydroxybutyrate) (PHB) and thermally reduced graphene (TRG) nanocomposites have been prepared successfully via a solution and coagulation method in this work at low TRG loadings. The effects of TRG on the crystal structure, spherulitic morphology, nonisothermal melt crystallization behavior, and isothermal melt crystallization kinetics of PHB in the PHB/TRG nanocomposites were investigated with various techniques. It was found that TRG does not change the crystal structure of PHB but apparently increases the nucleation density of PHB spherulites in the PHB/TRG nanocomposites. Moreover, both the nonisothermal and isothermal melt crystallizations of PHB are enhanced significantly in the nanocomposites because of the efficient nucleating agent effect of TRG. In addition, the isothermal melt crystallization kinetics of neat PHB and the PHB/TRG nanocomposites was analyzed by the Avrami equation. The overall isothermal melt crystallization rates of PHB are increased with deceasing crystallization temperature and increasing the TRG loadings in the nanocomposites; however, the crystallization mechanism remains unchanged in spite of the crystallization temperature and TRG loadings.