Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Preparation of Poly(butyl methacrylate) Composite Beads containing Carbon Black by Suspension Polymerization

현탁중합법에 의한 카본블랙을 함유하는 폴리뷰틸메타크릴레이트 복합체 입자의 합성

  • Moon, Ji-Yeon (Department of Polymer Engineering, University of Suwon) ;
  • Park, Moon-Soo (Department of Polymer Engineering, University of Suwon)
  • 문지연 (수원대학교 신소재공학과) ;
  • 박문수 (수원대학교 신소재공학과)
  • Published : 2008.09.30
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Abstract

Suspension polymerization was carried out to synthesize poly(butyl methacrylate) (PBMA) composite particles containing carbon black. Water was selected as a reaction medium, hydrophobic silica as a stabilizer and azobisisobutyronitrile as an initiator. Concentration of stabilizer was varied from 0.67 to 2.55 weight% with respect to the water, and that of initiator was varied from 0.25 to 3.00 weight% with respect to the butyl methacrylate (BMA) monomer. All polymerization reactions were conducted at 75$^{\circ}C$. It is found that stabilizer concentration has no impact on reaction kinetics, while an increase in initiator concentration enhances polymerization reaction rate. Increase of carbon black concentration from 1 to 3 to 5 wt% into PBMA displayed progressive decrease in reaction conversion. The particle diameter of PBMA composite particles containing carbon black was found to be between 5 and 30 ${\mu}m$. Glass transition was determined to range from 23.8 to 24.7$^{\circ}C$, irrespective of variation in the concentration of stabilizer, initiator or carbon black.

현탁중합법을 이용하여 카본블랙을 함유하는 폴리뷰틸메타크릴레이트 복합체 입자를 합성하였다. 물을 반응매체로 선택하고 소수성실리카를 안정제로 azobisisobutyronitrile (AIBN)을 개시제로 선택하였다. 안정제의 농도는 물에 대하여 0.67 중량%에서 2.55 중량%까지 변화시켰으며, 개시제는 단량체에 대하여 0.25 중량%에서 3.00 중량%까지 변화시키면서 반응역학에 미치는 영향을 조사하였다. 모든 반응은 75$^{\circ}C$에서 진행하였다. 안정제의 농도는 반응속도에 무관하였으나, 개시제의 증가는 반응속도를 증가시켰다. 카본블랙을 단량체에 대하여 1, 3 및 5 중량% 유입하는 경우 반응전환율은 단계적으로 감소하였다. 폴리뷰틸메타크릴레이트 복합체 입자의 입경은 5-30 ${\mu}m$로 관찰되었다. 유리전이온도는 카본블랙의 유입 및 개시제, 안정제의 농도에 무관하게 23.8-24.7$^{\circ}C$로 측정되었다.

Keywords

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