Polypropylene-Natural Fiber Composites: Rheological Properties during Mixing and Thermal Properties

폴리프로필렌-천연섬유 복합재료의 혼합시 유변학적 물성 및 열적 특성

  • Kim, Sam-Jung (Department of Polymer Science and Engineering, Pusan National University) ;
  • Yoo, Chong Sun (Korea Institute of Footwear and Leather Technology) ;
  • Kim, Gue-Hyun (Division of Applied Bioengineering, Dongseo University) ;
  • Ha, Chang-Sik (Department of Polymer Science and Engineering, Pusan National University)
  • Received : 2008.11.14
  • Accepted : 2008.11.24
  • Published : 2008.12.30

Abstract

Polypropylene-natural fiber composites have been prepared and their rheological properties during mixing and thermal properties were investigated. Two types of natural fibers (cotton fiber and wood fiber) were compared. On increasing fiber contents, the torque values of composites were increased, where the cotton fiber exhibited higher increase in torques. The torque values of composites were higher as the MI of PP decreased. X-ray diffraction and differential scanning calorimetry results showed an increase in the crystallization temperature but a decrease of crystallinity of the PP/natural fiber composites on increasing fiber contents.

두 종류의 천연섬유, 즉 면섬유와 목분을 이용하여 폴리프로필렌 - 천연섬유 복합재료를 제조하고 혼합가공시 유변학적 특성과 열적특성을 고찰하였다. PP/천연섬유 복합재료에서 천연섬유의 함량이 증가함에 따라 토오크 값이 상승하였고, 면섬유의 경우 낮은 체적 밀도로 인해 목분 복합재료보다 높은 토오크값을 나타내었다. PP의 MI에 따라서는 낮은 MI의 PP/천연섬유 복합재료에서 더 높은 토오크값이 관찰되었다. X-선 회절분석과 시차주사열분석을 통해 천연섬유의 함량이 증가될수록 PP/천연섬유 복합재료의 결정화온도는 상승하나 결정화도는 감소함이 확인되었다.

Keywords