화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.23, No.9, 809-813, September, 2015
DOI10.1007/s13233-015-3106-1  Export Citation
Properties of isotactic polypropylene/atactic polypropylene blends
Byung-Kook Nam1, 2, O. Ok Park1, 3, †, and Sung-Chul Kim1, 3, †
  • 1Department of Chemical and Biomolecular Engineering (BK 21+ Graduate program), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-338, Korea
  • 2Lotte Chemical Research Institute, 115 Gajeongbuk-ro, Yuseong-gu, Daejeon, 305-726, Korea
  • 3, Korea
E-mail:,
High-molecular-weight atactic polypropylene (HMW-aPP) was used as the impact modifier in isotactic polypropylene (iPP). HMW-aPP (M w 315,000 g/mol) was made by using metallocene catalysts, and iPP/HMW-aPP blends were prepared in a twin-screw extruder. The effects of HMW-aPP on the crystalline morphology, and thermal and mechanical properties of iPP were investigated by polarizing microscopy, differential scanning calorimetry, a universal testing machine, and Izod impact tests. The crystallization temperature and crystallinity of the iPP/HMWaPP blends increased compared to that of pure iPP. The HMW-aPP acted as a diluent during the crystallization of the iPP/HMW-aPP blends. These diluent HMW-aPP molecules prevented entanglement of the iPP molecules, which facilitated the crystallization of iPP. The Izod impact strength of the iPP/HMW-aPP blends increased with increasing HMW-aPP content owing to the incorporation of the soft HMW-aPP into the hard iPP. The Izod impact strength of the iPP-80 blend dramatically increased by 680% compared to that of neat iPP.
Keywords:polypropylene;atactic polypropylene;Izod impact strength;polymer blend
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