Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Thermal Behavior and Physical Properties of Low Density Polyethylene/Metallocene Linear Low Density Polyethylene Blends

저밀도 폴리에틸렌/메탈로센 선형 저밀도 폴리에틸렌 블렌드의 열적 거동 및 물성

  • Kim, Jang-Yup (Department of Chemical & Environmental Engineering, Soongsil University) ;
  • Hyun, Uk (Department of Chemical & Environmental Engineering, Soongsil University) ;
  • Lee, Dong-Ho (Department of Polymer Science, Kyungpook National University) ;
  • Noh, Seok-Kyun (School of Chemical Engineering & Technology, Yeoungnam University) ;
  • Lee, Sang-Won (Department of Chemical & Environmental Engineering, Soongsil University) ;
  • Huh, Wan-Soo (Department of Chemical & Environmental Engineering, Soongsil University)
  • 김장엽 (숭실대학교 환경화학공학과) ;
  • 현욱 (숭실대학교 환경화학공학과) ;
  • 이동호 (경북대학교 고분자공학과) ;
  • 노석균 (영남대학교 응용화학공학부) ;
  • 이상원 (숭실대학교 환경화학공학과) ;
  • 허완수 (숭실대학교 환경화학공학과)
  • Published : 2003.09.01
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Abstract

The thermal and physical properties of low density polyethylene melt-blended with Metallocene linear low density polyethylenes were investigated. Since the Metallocene polyethylenes have similar MW and MWD except m-LLDPE4, it can be said that the thermal behavior and mechanical properties of the blends depend upon the l-octene comonomer content. The melting behavior of LDPE/m-LLDPE1 blends shows two melting peaks with LDPE contents higher than 50%, while the other blends show only one melting peak. It was observed that the blends show higher crystallization temperature and higher crystallinity with lower comonomer content. Initial modulus of a blend exhibited the behavior proportional to the crystallinity and the elongation at break of the blends was increased with increasing the m-LLDPE composition. Melt indices of the blends decreased with increasing the comonomer content of Metallocene LLDPE. Melt Index values of the blends show negative deviation.

메탈로센 선형 저밀도 폴리에틸렌 (m-LLDPE)과 저밀도 폴리에틸렌 (LDPE)을 용응 블렌딩 방법으로 블렌드를 제조하여 열적 거동 및 물성을 관찰하였다. LDPE/m-LLDPE1 블렌드는 LDPE조성이 50% 이상이면 두 개의 용융 피크가 관찰된 반면 다른 블렌드들은 단일한 용융 피크를 나타내었다. m-LLDPE에서 공단량체 함량이 감소할수록 용융 온도와 상대 결정화도가 증가하였다. 공단량체 함량이 2 wt%인 m-LLDPE1이 초기 탄성률이 가장 높게 관찰되었고, 공단량체 함량이 증가함에 따라 감소하였다. 블렌드에서 조성에 따른 초기 탄성률의 변화는 상대 결정화도의 거동과 유사하게 나타났다. 블렌드의 파괴 신율은 LDPE/m-LLDPE1과 LDPE/m-LLDPE2 블렌드에서 평균값보다 낮은 파괴 신율을 나타내었었다. m-LLDPE2의 용융 지수가 가장 높게 관찰되었고 공단량체 함량이 증가함에 따라 감소하는 경향을 나타내었다.

Keywords

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