Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Dispersion of Stearic-Acid-Treated CaCO3 in Polypropylene

Stearic acid로 표면 코팅된 탄산칼슘의 폴리프로필렌에서의 분산

  • Song, Junyoung (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Jung, Yoen-Su (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Ham, Min-Kyoung (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kwark, Young-Je (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Jeong, Young-Jin (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 송준영 (숭실대학교 유기신소재.파이버공학과) ;
  • 정연수 (숭실대학교 유기신소재.파이버공학과) ;
  • 함민경 (숭실대학교 유기신소재.파이버공학과) ;
  • 곽영제 (숭실대학교 유기신소재.파이버공학과) ;
  • 정영진 (숭실대학교 유기신소재.파이버공학과)
  • Received : 2012.05.01
  • Accepted : 2012.06.06
  • Published : 2012.06.30
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Abstract

Calcium carbonate ($CaCO_3$) with 15~40 nm average diameter was compounded with polypropylene (PP) in a melted state to form composite materials. To enhance the dispersibility in PP, the surface of the $CaCO_3$ was coated with hydrophobic stearic acid (SA). The SA-coated $CaCO_3$ (SA-$CaCO_3$) showed hydrophobic nature, which resulted in rapid precipitation in water. When melt-compounded with PP, SA-$CaCO_3$ was uniformly distributed throughout the PP matrix, while the uncoated $CaCO_3$ formed aggregated structures in the PP. At up to 5 wt% of SA-$CaCO_3$ content, the composites showed well-dispersed structure, although some level of aggregation was observed in the composites with 10 wt% of SA-$CaCO_3$. The dispersibility improved with a repeated process of compounding. The melting and crystallization temperatures of PP increased with incorporation of $CaCO_3$. The enthalpy of the transitions also increased and the full-width of half maximum of the crystallization peak decreased. However, SA-coating did not produce additional effects on the crystallization behavior of PP. These results showed that the $CaCO_3$ acted as crystal nuclei.

Keywords

Acknowledgement

Supported by : 지식경제부

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