Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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A Study on the Preparation of PBAST/PVA Double Layered Hollow Microspheres

PBAST/PVA 이중층 중공미세구의 제조에 관한 연구

  • Song, Myung-Sook (Department of Industrial Chemistry, Sangmyung University) ;
  • Woo, Je-Wan (Department of Industrial Chemistry, Sangmyung University)
  • Published : 2008.12.31
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Abstract

In this study, using PBAST (poly(butylene adipate-co-succinate-co-terephthalate)) which was eco-friendly biodegradable aliphatic polyester, PBAST/PVA (poly(vinyl alcohol)) double-layered hollow microspheres were prepared with the water/oil/water multiple emulsion ($W_1/O/W_2$) method. The double-layered hollow microspheres were manufactured with the yield of 30.92% when the concentration of polymer PBAST in organic phase was 5 wt%, the concentration of PVA in inner aqueous phase was 5 wt%, the volume ratio of $W_1/O$ emulsion to outer aqueous phase was 1:4.5, and when co-surfactants that had large gap in HLB (hydrophile-lipophile balance) value were used. The bulk density of prepared hollow microsphere was 0.180 g/ml and particle size was $1.5{\sim}3\;{\mu}m$.

본 연구에서는 생분해가 가능하여 친환경성이 우수한 지방족 폴리에스터 중에서 PBAST를 이용하여, 다중유화법($W_1/O/W_2$)에 의해 PBAST/PVA 두층을 갖는 중공미세구를 제조하였다. 최적의 이중층 중공미세구를 얻을 수 있는 조건은, 유기상에서 의 PBAST고분자의 농도 5 wt%, 내부 수용액 상에서의 PVA의 농도 5 wt%, $W_1/O$ emulsion과 외부 수용액상의 비율이 1:4.5이었고 계면활성제는 단일 성분을 사용하는 경우보다 HLB 값의 차이가 큰 보조계면활성제(co-surfactant)를 사용하는 경우였으며, 이때 PBAST/PVA 이중층중공미세구(double-layered microsphere)의 제조 수율은 30.92%, 미세구의 총괄밀도(bulk density)는 0.180 g/ml이며 입자크기는 $1.5{\sim}3\;{\mu}m$로 고른 분포를 나타내었다.

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