Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Effect of Chemical Composition, Molecular Weight, Carbon Black Concentration and Temperature on the Flow Behavior of Styrene/Butyl Methacrylate Homo- and Co-polymer Particles

화학적 구성, 분자량, 카본블랙의 농도 및 온도에 따른 스티렌/부틸메타크릴레이트 단일중합체 및 공중합체 입자의 유동성

  • Park, Moon-Soo (Department of Polymer Engineering, University of Suwon) ;
  • Moon, Ji-Yeon (Department of Polymer Engineering, University of Suwon)
  • 박문수 (수원대학교 신소재공학과) ;
  • 문지연 (수원대학교 신소재공학과)
  • Received : 2010.07.09
  • Accepted : 2010.10.14
  • Published : 2011.01.25
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Abstract

We measured shear viscosity of polymeric particles, prepared by suspension polymerization with hydrophobic silica as a stabilizer at $75^{\circ}C$, by a capillary rheometer. Shear viscosity displayed a non-Newtonian behavior with an increase in weight average molecular weight. Measurement of shear viscosity at 170 and $190^{\circ}C$ with copoly(styrene/butyl methacrylate) (co-PSB) particles by varying the ratio between styrene (St) and butyl methacrylate (BMA) showed that shear viscosity was a function of molecular weight, temperature and compositional ratio. When the ratio was 7/3, 5/5 and 3/7, shear viscosity slightly reduced with an increase in BMA concentration despite similar weight average molecular weights. We found that shear viscosity of copolymers with BMA concentrations exceeding 70% displayed a sharp reduction at high shear rates. It is speculated that increased PBMA chain length contributes to enhanced flowability of copolymers. When carbon black was incorporated into co-PSB, shear viscosity progressively increased with increasing carbon black concentration. The increase in shear viscosity, however, was less pronounced compared to the cases of molecular weight increase.

소수성 설리카를 안정제로 하는 현탁중합법으로 $75^{\circ}C$에서 합성한 고분자입자들을 모세관 레오미터를 이용하여 전단점도를 측정하였다. 전단점도는 중량평균분자량이 증가하면서 비뉴톤거동을 나타내였다. 스타렌(St)/부틸메타크릴레이트(BMA)의 구성비를 변화하며 합성한 공중합체 입자를 이용하여 $170^{\circ}C$ 및 $190^{\circ}C$에서 측정한 전단점도는 분자량, 온도 뿐만 아니라 구성비에 따라서도 변화하였다. St/BMA의 구성비가 7/3, 5/5 및 3/7의 공중합체 (co-PSB) 입자의 경우 유사한 분자량을 나타내었지만 BMA의 구성비가 증가하면서 전단점도는 소폭 감소하였다. BMA의 비가 3/7을 초과하며 높은 전단속도에서의 전단점도는 급격히 감소하였다. 이는 BMA 구성비의 증가에 따른 PBMA 사슬의 길이의 증가로 인한 유동성 향상에 기인하는 것으로 판단된다. 카본블랙을 함유하는 co-PSB 복합체 업자의 전단점도는 카본블랙의 증가에 따라 점진적으로 증가하였으나, 카본블랙의 농도 증가에 따른 전단점도의 증가는 분자량의 증가 효과에 비교하여 미약하였다.

Keywords

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