摘要
通过溶液浇铸法制备了聚乙烯醇(PVOH)/微纤化纤维素(MFC)复合薄膜材料,以超临界二氧化碳(scCO2)为物理发泡剂,采用间歇式降压法制备了一系列PVOH/MFC复合微发泡材料,主要讨论了在没有水分的影响下,不同发泡温度和时间以及MFC含量对PVOH/MFC复合微发泡材料的泡孔形貌、泡孔尺寸和泡孔密度的影响;同时,也对MFC的分散性和PVOH/MFC复合材料的流变性能和热性能对发泡行为的影响进行了研究。实验结果表明,均匀分散在PVOH基体中的MFC作为异相成核剂提高了气孔成核能力,且随着MFC含量的增加,泡孔尺寸降低,泡孔密度增大;并研究了发泡温度对PVOH/MFC复合材料的发泡形貌的影响,获得最优发泡温度。
The effect of microfibrillated cellulose content and foaming temperature and time on the foaming behavior of dry poly（vinyl alcohol）（PVOH）/ microfibrillated cellulose（MFC） composites was investigated. PVOH/MFC composites were prepared by the solution film casting method and foamed via the batch depressurization foaming process with a physical blowing agent supercritical CO2. The rheological properties and thermal properties of PVOH/MFC composites were characterized. Microfibrillated cellulose fiber acted as nucleating agent during the foaming process, and there was an optimum processing temperature for achieving high-quality cellular morphology of the PVOH/MFC composites.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第2期806-813,共8页
CIESC Journal
基金
国家自然科学基金项目(11372286)
国家重点基础研究发展计划项目(2012CB025903)~~
关键词
聚乙烯醇
超临界二氧化碳
挤出
发泡
成核
polyvinyl alcohol
supercritical carbon dioxide
extrusion
foam
nucleation
