SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (11): 1296-1302.DOI: 10.1016/S1004-9541(13)60623-0

• 生物技术与生物工程 • 上一篇    下一篇

Sorption and Diffusion Behavior of Carbon Dioxide into Poly(l-lactic acid) Films at Elevated Pressures

余金鹏, 唐川, 关怡新, 姚善泾, 朱自强   

  1. Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2012-04-28 修回日期:2012-09-14 出版日期:2013-11-28 发布日期:2013-11-26
  • 通讯作者: GUAN Yixin
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21076185).

Sorption and Diffusion Behavior of Carbon Dioxide into Poly(l-lactic acid) Films at Elevated Pressures

YU Jinpeng, TANG Chuan, GUAN Yixin, YAO Shanjing, ZHU Ziqiang   

  1. Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2012-04-28 Revised:2012-09-14 Online:2013-11-28 Published:2013-11-26
  • Contact: GUAN Yixin
  • Supported by:

    Supported by the National Natural Science Foundation of China (21076185).

摘要: Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly(l-lactic acid) (PLLA) films at elevated pressures were determined by the gravimetric method, in which the Fick's diffusion model was applied to analyze both the desorption and sorption processes. The equilibrium sorption amount of CO2 in PLLA increased with lowering temperature and elevating pressure at the temperature range from 40 to 60 ℃ and pressure from 104 to 2×104 kPa. Desorption diffusion coefficients were greatly influenced by the equilibrium sorption amount, and they were in the same order of magnitude as the sorption diffusion coefficients. The scan electron microscope (SEM) photos demonstrated that there was no foaming phenomenon of the PLLA film during desorption and sorption processes. The XRD spectra implied that the crystalline degree of PLLA film decreased after CO2 processing. It was concluded that PLLA polymer could be well swollen and plasticized by supercritical CO2.

关键词: supercritical solution impregnation, carbon dioxide, poly (l-lactic acid), sorption, diffusion

Abstract: Equilibrium sorption amount, desorption diffusion coefficients and sorption diffusion coefficients of CO2 in poly(l-lactic acid) (PLLA) films at elevated pressures were determined by the gravimetric method, in which the Fick's diffusion model was applied to analyze both the desorption and sorption processes. The equilibrium sorption amount of CO2 in PLLA increased with lowering temperature and elevating pressure at the temperature range from 40 to 60 ℃ and pressure from 104 to 2×104 kPa. Desorption diffusion coefficients were greatly influenced by the equilibrium sorption amount, and they were in the same order of magnitude as the sorption diffusion coefficients. The scan electron microscope (SEM) photos demonstrated that there was no foaming phenomenon of the PLLA film during desorption and sorption processes. The XRD spectra implied that the crystalline degree of PLLA film decreased after CO2 processing. It was concluded that PLLA polymer could be well swollen and plasticized by supercritical CO2.

Key words: supercritical solution impregnation, carbon dioxide, poly (l-lactic acid), sorption, diffusion