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摘要
为了提高聚乳酸薄膜的气体阻隔性能,利用氧化石墨烯(GO)和聚乙烯亚胺之间的静电结合力,通过层层自组装法将它们沉积在聚乳酸(PLA)基底上制备GO/PLA自组装薄膜。选择了3个厂家生产的GO,对其进行了结构分析,并对其制备的GO/PLA自组装薄膜的阻隔性能进行了检测,筛选出最合适的GO。并考察了GO浓度、自组装层数对GO/PLA自组装薄膜的氧气、水蒸汽阻隔性能的影响。结果表明:GO的阻隔性能受到片径、缺陷程度和含氧官能团的综合影响;随着GO浓度增加,自组装层数增加,自组装薄膜的阻隔性能均有明显改善,但水蒸汽的阻隔性能变化不如氧气阻隔性能变化剧烈;当GO浓度为6mg/mL,自组装层数为20层时,相比于聚乳酸原膜,透氧系数和水蒸汽透过率分别降低了99.01%和56.6%。
Abstract
In order to improve the barrier performance of poly (lactic acid)(PLA) films,GO/PLA films were prepared by depositing graphene oxide (GO) and polyethyleneimine (PEI) on PLA substrates through layer-by-layer self-assembly method by means of the electrostatic binding force between GO and PEI.The GOs produced by three manufacturers were selected,and their structures and the barrier performance of self-assembled films were analyzed to screen out the most suitable GOs.Then,the effects of GO concentration and the number of self-assembled layers on the oxygen and water vapor barrier performance of self-assembled GO/PLA films were investigated.The results were shown as follows.(1)The barrier property of GO was comprehensively determined by its sheet size,defect degree and the number of oxygen-containing functional groups.(2)With the increase of GO concentration and the number of self-assembled layers,the barrier performance of the self-assembled films were significantly improved,but the change of the barrier performance to water vapor was not as drastic as that to oxygen.(3)When the concentration of GO was 6mg/mL and the number of self-assembled layers was 20,the oxygen permeability and water vapor permeability were reduced by 99.01% and 56.6%,respectively,compared with the PLA film.
关键词
氧化石墨烯
/
聚乙烯亚胺
/
气体阻隔
/
层层自组装法
Key words
graphene oxide
/
polyethyleneimine
/
gas barrier performance
/
layer-by-layer assembly method
氧化石墨烯/聚乳酸自组装薄膜的制备及阻隔性能研究[J].
化工新型材料, 2023, 51(4): 96-101 DOI:10.19817/j.cnki.issn1006-3536.2023.04.017
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基金资助
广东省市场监督管理局科技项目任务书(2018CZ42、2018CT36、2020CT06和2020CT04)
