Solution Viscosity and Relative Reactivity of Branched and Linear Polycarbonates

• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: Sang Pil Kim Bong Hee Lee Sang Hern Kim Whan Gi Kim
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제17권 제2호, 76~82쪽, 전체 7쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2000.06.30

영문 초록

The relative reactivities of branched and linear polycarbonates were investigated by measuring unreacted chloroformate concentration. It was found that the polymerization for the branched polymer proceeded ca. 10 times faster than that for the linear polymers. The effect of catalyst on a condensation step was studied by changing the amount of TEA (triethylamine) at t₀ and t₆₀ with keeping constant amount of TEA. The viscosity average molecular weight for the obtained branched polycarbonates were measured and compared with those of linear polycarbonates. It was found that the viscosity molecular weights of the obtained polymers decreased nonlinearly as wt % of added oligomer increased. The solution viscosities in methylenechloride for linear and branched polycarbonate increased nonlinearly as the content of polymer increased.

목차

Abstract

Ⅰ. Introduction

Ⅱ. Experimental

Ⅲ. Results and discussion

Ⅳ. Conclusions

Acknowledgment

References