Stearic acid로 표면 코팅된 탄산칼슘의 폴리프로필렌에서의 분산 (Dispersion of Stearic-Acid-Treated CaCO3 in Polypropylene)

서지정보

· 발행기관 : 한국섬유공학회
· 수록지 정보 : 한국섬유공학회지 / 49권 / 3호 / 169 ~ 173페이지
· 저자명 : 송준영, 정연수, 함민경, 곽영제, 정영진

초록

Calcium carbonate (CaCO3) 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 CaCO3 was coated with hydrophobic stearic acid (SA). The SA-coated CaCO3 (SA-CaCO3) showed hydrophobic nature, which resulted in rapid precipitation in water. When melt-compounded with PP, SA-CaCO3 was uniformly distributed throughout the PP matrix, while the uncoated CaCO3 formed aggregated structures in the PP. At up to 5 wt% of SA-CaCO3 content, the composites showed well-dispersed structure, although some level of aggregation was observed in the composites with 10 wt% of SA-CaCO3. The dispersibility improved with a repeated process of compounding. The melting and crystallization temperatures of PP increased with incorporation of CaCO3. 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 CaCO3 acted as crystal nuclei.

영어초록

Calcium carbonate (CaCO3) 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 CaCO3 was coated with hydrophobic stearic acid (SA). The SA-coated CaCO3 (SA-CaCO3) showed hydrophobic nature, which resulted in rapid precipitation in water. When melt-compounded with PP, SA-CaCO3 was uniformly distributed throughout the PP matrix, while the uncoated CaCO3 formed aggregated structures in the PP. At up to 5 wt% of SA-CaCO3 content, the composites showed well-dispersed structure, although some level of aggregation was observed in the composites with 10 wt% of SA-CaCO3. The dispersibility improved with a repeated process of compounding. The melting and crystallization temperatures of PP increased with incorporation of CaCO3. 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 CaCO3 acted as crystal nuclei.

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