Nonisothermal crystallization behaviors of nanocomposites prepared by in situ polymerization of high-density polyethylene on tungsten oxide particles

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• 作者：Kyounghwan Oh (1)
  Wei Huan Chua (1)
  Sung Eun Park (1)
  Jihun Kim (1)
  Soonjong Kwak (2)
  Sehyun Kim (3)
  Yongsok Seo (1)
  
  1. RIAM ; School of Materials Science and Engineering ; College of Engineering ; Seoul National University ; Daehakro 1 ; Kwanakgu ; Seoul ; 151-744 ; Korea
  2. Polymer Hybrid Research Center ; Korea Institute of Science & Technology ; P.O.Box 131 ; Cheongryang ; Seoul ; 136-791 ; Korea
  3. Polymer Processing Technology Team ; LG Chemical Ltd./Tech Center ; Moonjidong 104-1 ; Yousungku ; Daejon ; 305-738 ; Korea
  
• 关键词：WO3/HDPE composites ; nonisothermal crystallization kinetics ; morphological development ; in situ metallocene polymerization
• 刊名：Macromolecular Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：23
• 期：3
• 页码：265-272
• 全文大小：1,035 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Polymer Sciences
  Characterization and Evaluation of Materials
  Soft and Granular Matter, Complex Fluids and Microfluidics
  Nanochemistry
  Nanotec
  
• 出版者：The Polymer Society of Korea, co-published with Springer
• ISSN：2092-7673

文摘

Morphology development and thermal properties of polyolefin composites (tungsten oxide (WO3)/high density polyethylene (HDPE)) were characterized by differential scanning calorimetry, polarized optical microscopy, and nonisothermal crystallization kinetics. Tungsten oxide (WO3) and HDPE composites were prepared by the in situ metallocene polymerization method which consisted of attaching a metallocene catalyst complex onto the surface of the nuclei (WO3) and followed by the surface-initiated polymerization. A kinetic equation proposed by Seo was employed to analyze the nonisothermal crystallization characteristics of the composites. The polarized optical microscopy and the Avrami exponent verified the importance of the interaction between the HDPE molecules and the nuclei surface for the HDPE molecular ordering around the metal powder as well as the morphological development in the early stage. The Avrami exponent, n, determined from the nonisothermal crystallization kinetics analysis indicates random 3-dimentsional morphology development for the WO3/HDPE composites. Dispersed WO3 accelerated the crystallization rate due to heterogeneous nucleation effect as indicated by the shift in the crystallization peaks to higher temperatures. The obtained crystalline structures were compared to those for the neat polyethylene resins and carbon nanotube (CNT)/HDPE composites.