Study on the Pressure-Volume-Temperature Properties of Polypropylene at Various Cooling and Shear Rates

Pengcheng Xie; Huaguang Yang; Tianze Cai; Zheng Li; Yuelin Li; Weimin Yang

doi:10.7317/pk.2018.42.2.167

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자료유형: 학술저널

저자정보: Pengcheng Xie (Beijing University of Chemical Technology) Huaguang Yang (Beijing University of Chemical Technology) Tianze Cai (Beijing University of Chemical Technology) Zheng Li (Beijing University of Chemical Technology) Yuelin Li (Beijing University of Chemical Technology) Weimin Yang (Beijing University of Chemical Technology)

저널정보: 한국고분자학회 폴리머 폴리머 제42권 제2호

발행연도: 2018.3

수록면: 167 - 174 (8page)

DOI: 10.7317/pk.2018.42.2.167

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To understand the pressure-volume-temperature (PVT) properties of polymer in injection process, a dilatometer with high cooling rate (up to 25 ℃/s) and shear rate (up to 320 s<SUP>-1</SUP>) was developed. The working pressure and temperature of the dilatometer range from 0 to 100 MPa, and from 30 to 300 ℃, respectively. With this instrument, a crystalline polymer polypropylene (PP) was employed to study the effects of cooling rate, shear rate, pressure and their coupling effect on its PVT properties. It was demonstrated that the cooling rate showed a significant effect on the PVT properties. With the increase of cooling rate, the transition temperature of PP from melt state to crystallization decreases gradually and the temperature range of crystallization was also extended. Shear increased the transition temperature of PP from melt state to crystallization. Meanwhile, the initial temperature of shear and crystalline segment was shifted to a higher temperature region with increasing shear duration or shear rate. Above the transition temperature, the effect of shear on the PVT properties weakened gradually with increasing the initial temperature. The coupling analysis of cooling and shear processes showed that increase in cooling rate was enhanced the effect of shear on the transition temperature of PP from melt state to crystallization.

#pressure-volume-temperature properties #cooling rate #shear rate #crystallization

참고문헌 (14)

참고문헌 신청

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김성근 / 2005 / 열가소성 폴리우레탄의 결정화에 미치는 폴리올 종류 및 경질부 함량의 영향 / 폴리머 29(2):140~145

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