Nonisothermal Crystallization Kinetics of High-Density Polyethylene/Barium Sulfate Nanocomposites

文献类型： 外文期刊

第一作者： Chen, Xiaolei

作者： Chen, Xiaolei;Wang, Lumin;Liu, Yongli;Shi, Jiangao;Shi, Hang

作者机构：

期刊名称：POLYMER ENGINEERING AND SCIENCE （ 影响因子：2.428； 五年影响因子：2.276 ）

ISSN： 0032-3888

年卷期： 2009 年 49 卷 12 期

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收录情况： SCI

摘要： The high-density polyethylene (HDPE)/barium sulfate (BaSO(4)) nanocomposites had been successfully prepared by melt-blending. Nonisothermal melt-crystallization kinetics of neat HDPE and HDPE/BaSO(4) nanocomposites was investigated with differential scanning calorimetry under different cooling rates. The nonisothermal crystallization behavior was analyzed by Ozawa, Avrami, and combined Ozawa-Avrami methods. It was found that the Ozawa method failed to describe the nonisothermal crystallization behavior of neat HDPE and HDPE/BaSO(4) nanocomposites. The modified Avrami method by Jeziorny was only valid for describing the middle stage of crystallization but was not able to describe the later stage of neat HDPE and HDPE/BaSO(4) nanocomposites crystallization. The value of Avrami exponent n for neat HDPE ranged from 3.3 to 5.7 and for HDPE/BaSO(4) nanocomposites ranged from 1.8 to 2.5. It is postulated that the values of n close to 3 are caused by spherulitic crystal growth with heterogeneous nucleation, whereas simultaneous occurrence of spherulitic and lamellar crystal growth with heterogeneous nucleation account for lower values of n. The combined Ozawa-Avrami method by Mo and coworkers (Polym. Eng. Sci., 37(3), 568 (1997)) was able to satisfactorily describe the crystallization behavior of neat HDPE and HDPE/BaSO(4) nanocomposites. In addition, the activation energy of nonisothermal crystallization was determined using the Kissinger (J. Res. Nath Bur Stand, 57(4), 217 (1956)) method, showing that the crystallization activation energy of HDPE/BaSO(4) nanocomposites was lower than that of neat HDPE. POLYM. ENG. SCI., 49:2342-2349, 2009. (C) 2009 Society of Plastics Engineers

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