中国塑料 ›› 2018, Vol. 32 ›› Issue (10): 45-49.DOI: 10.19491/j.issn.1001-9278.2018.10.007

• 材料与性能 • 上一篇    下一篇

CO2在聚乳酸中的溶解和扩散行为研究

余科松1,倪敬越1,周洪福1,王向东1,密建国2   

  1. 1. 北京工商大学材料与机械工程学院
    2. 北京化工大学化工学院
     
  • 收稿日期:2018-08-02 修回日期:2018-09-07 出版日期:2018-10-26 发布日期:2018-10-26
  • 基金资助:

    北京市自然科学基金(2162012);国家自然基金(51673004);2017商科特色项目(19005757053)

Study on Solubility and Diffusion Properties of CO2 in PLA/PBAT Blends

  • Received:2018-08-02 Revised:2018-09-07 Online:2018-10-26 Published:2018-10-26

摘要: 采用统计力学的密度泛函理论,建立了CO2在聚乳酸中的溶解度计算理论模型,并利用非原位重力法测定了CO2在聚乳酸以及在聚乳酸/聚己二酸对苯二甲酸丁二醇酯(PBAT)合金中的溶解度及扩散系数。将实验数据和理论计算结果对比,结果表明,DFT模型可以定量预测不同温度、压力条件下CO2在聚乳酸中的溶解度,而非原位重力法在低压下具有较高的准确性,且适用条件广泛;相比于纯聚乳酸,在不影响扩散系数的情况下,聚乳酸/PBAT合金具有更高的CO2溶解度。

Abstract: A theoretical model for calculating the solubility of CO2 in poly(lactic acid) (PLA) was established with a statistical mechanic density functional theory (DFT).The solubility and diffusion coefficients of CO2 in PLA and PLA/poly(butyleneadipatecoterephthalate) (PBAT) blends were determined by an exsitu gravimetric method.By comparing the experimental data with the theoretical calculation results, the DFT model was found to be able to quantitatively predict the solubility of CO2 in PLA at different temperatures and pressures.The addition of PBAT reduced the solubility of CO2 in PLA just with little effect on the diffusion coefficient.