Gas permeation properties of poly(lactic acid)
Gas permeation properties of poly(lactic acid)
复制标题
DOI：
10.1016/s0376-7388(01)00446-x
复制
发表时间：
2001-09-15
影响因子：
9.5
通讯作者：
Way, JD
中科院分区：
文献类型：
--
作者：
Lehermeier, HJ;Dorgan, JR;Way, JD
对基于可再生资源的聚合物材料的开发的需求导致了聚乳酸（PLA）的开发，聚乳酸（PLA）是由玉米而不是石油原料生产的。本研究研究了溶液铸造的 PLA 无定形薄膜中氮气、氧气、二氧化碳和甲烷的渗透情况。将 PLA 的特性与其他商品塑料进行比较，结果表明 PLA 的渗透性与聚苯乙烯的渗透性非常相似。 30℃时，N-2在PLA中的渗透率为1.3(10(-10)cm(3)(STP)cm/cm(2)scmHg)，活化能为11.2kJ/mol。对于氧气，相应的值为 3.3 (10(-10) cm(3) (STP) ca/cm(2) s cm Hg) 和 11. 1 kJ/mol。二氧化碳渗透率为1.2 (10(-10) cm(3) (STP) cm/cm(2) s cmHg) 和6.1 kJ/mol。对于 1.0 (10(-10) cm(3) (STP) cm/cm(2) s cmHg) 的甲烷值和 13.0 kJ/mol 的活化能。对纯气体的研究表明，聚合物链支化和 L:D 立体化学含量的微小变化对渗透性能没有影响，发现结晶度在双轴取向薄膜中主导渗透性能。 CO2/CH4 混合气体系统的分离因子在 0 至 50°C 之间测量，与计算的理想分离因子没有显着偏差；在 0 摄氏度下，分离因子为 16，该值表明有必要继续研究 PLA 作为分离介质。 (C) 2001 Elsevier Science B.V. 保留所有权利。
The need for the development of polymeric materials based on renewable resources has led to the development of poly(lactic acid) (PLA) which is being produced from a feedstock of corn rather than petroleum. The present study examines the permeation of nitrogen, oxygen, carbon dioxide, and methane in amorphous films of PLA cast from solution. The properties of PLA are compared to other commodity plastics and it is shown that PLA permeation closely resembles that of polystyrene. At 30 degreesC, N-2 permeation in PLA is 1.3 (10(-10) cm(3) (STP) cm/cm(2) s cmHg) and the activation energy is 11.2kJ/mol. For oxygen the corresponding values are 3.3 (10(-10) cm(3) (STP) ca/cm(2) s cm Hg) and 11. 1 kJ/mol. The values for carbon dioxide permeation are 1.2 (10(-10) cm(3) (STP) cm/cm(2) s cmHg) and 6.1 kJ/mol. For methane values of 1.0 (10(-10) cm(3) (STP) cm/cm(2) s cmHg) and an activation energy of 13.0 kJ/mol are found. Studies with pure gases show that polymer chain branching and small changes in L:D stereochemical content have no effect on permeation properties, Crystallinity is found to dominate permeation properties in a biaxially oriented film. The separation factor for a CO2/CH4 mixed gas system is measured between 0 and 50 degreesC and does not deviate significantly from the calculated ideal separation factor; at 0 degreesC the separation factor is 16, a value that suggests continued studies of PLA as a separation medium are warranted. (C) 2001 Elsevier Science B.V. All rights reserved.