聚乙烯醇分子结构对聚乙烯醇/氧化石墨烯复合材料吸水保水性能的影响  

Microstructure and Water Absorption Properties of Polyvinyl Alcoholand Preparation of Polyvinyl Alcohol /Graphene Oxide Composites with High Water Absorbing Properties

作　　者：董强[1] 凌天清[2] 熊出华 Qiang Dong;Tianqing Ling;Chuhua Xiong(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆400074 [3]重庆交通大学材料科学与工程学院,重庆400074

出　　处：《高分子材料科学与工程》2019年第5期38-43,共6页Polymer Materials Science & Engineering

基　　金：重庆市社会事业与民生保障科技创新专项项目(cstc2017shmsA0727);重庆市重点实验室开放基金项目(CQMRCM-10-3)

摘　　要：对4种聚乙烯醇(PVA)的相对分子质量、醇解度、VAc单元嵌段度进行了定量表征,并制备了PVA/氧化石墨烯(GO)复合材料,对其结晶度、结晶及熔融行为、吸水和保水性能进行研究,试图揭示PVA分子结构与PVA/GO复合材料吸水及保水性能之间的深层联系。结果表明,PVA醇解度越高,VAc单元嵌段度越低,其PVA/GO复合材料的结晶和熔融温度就越高、结晶度越高,而相对分子质量的影响很小;另一方面,醇解度过低、疏水乙酰基含量高、氢键含量少时,则吸水性能和保水性能较差;醇解度过高则会导致结晶度过高,对吸水和保水性能有抑制作用。只有醇解度及结晶度适中时,PVA/GO吸水及保水性能最优。In this study,the molecular weight and distribution,hydrolysis degree,VAc unitdistributionof four kinds of polyvinyl alcohol(PVA)were characterized.The PVA/graphene oxide(PVA/GO)composites were prepared,and the crystallinity,crystallization behavior,water absorption/water retention property were studied to elucidate the relationship between PVA molecular structures and water absorption/water retention properties of PVA/GO.The results suggest that with the higher hydrolysis degree and the lower VAc unit distribution,the crystallization and melting temperature is higher,and the crystallinity increases;meanwhile,the molecular weight of PVA is not important.A low hydrolysis degree leads to a high content of hydrophobic ethanoyl group and a low content of hydrogen bond and finally undesirable water absorption/water retention properties,while the high hydrolysis degree results in too high crystallinity,playing a depressive effect to water absorption/water retention properties of the composites.Only sample PVA-2 with the medium hydrolysis degree can provide the highest water absorption/water retention properties.

关 键 词：聚乙烯醇 分子结构 吸水性能 保水降温 氧化石墨烯 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]