Nonisothermal Crystallization Kinetics of High-Density Polyethylene/Barium Sulfate Nanocomposites
文献类型： 外文期刊
作者： Chen, Xiaolei 1 ; Wang, Lumin 1 ; Liu, Yongli 1 ; Shi, Jiangao 1 ; Shi, Hang 1 ;
作者机构： 1.Chinese Acad Fishery Sci, E China Sea Fisheries Res Inst, Key & Open Lab Marine & Estuarine Fisheries, Minist Agr, Shanghai 200090, Peoples R China
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
页码：
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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