酰胺化纳米晶纤维素提高乙烯-醋酸乙烯酯共聚物薄膜阻透性的研究  

Effect of Amide-based Cellulose Nanocrystals on Barrier Performance of EVA Films

作　　者：谭婵娟[1,2] 许凯[1] 陈鸣才[1] 

机构地区：[1]中国科学院广州化学研究所,广东广州510650 [2]中国科学院大学,北京100049

出　　处：《中国塑料》2013年第7期19-24,共6页China Plastics

摘　　要：合成了3种酰胺化纳米晶纤维素，并采用溶液共混成膜法制备了乙烯-醋酸乙烯酯共聚物／酰胺化纳米晶纤维素（EVA／CNC）复合膜材料。通过紫外-可见分光光度计、电子万能试验机和透湿仪研究了酰胺化CNC／EVA复合膜的光学性能、力学性能以及水蒸气阻透性，并通过原子力显微镜研究热压处理的EVA复合膜的表面形貌。结果表明，添加3种不同碳链的酰胺化CNC都使EVA膜的透光率有所降低，当添加量为5％时，EVA膜透过率仍高达90％；一定程度的热压能够让酰胺化纳米晶纤维素在EVA基体中分散更均匀，使EVA复合膜的透过率提高了2％～3％；随着纳米晶纤维素含量的逐渐增加，3种酰胺化EVA／cNc膜的拉伸强度均逐渐增强，透湿率均减小；酰胺化CNC含量相同时，EVA／十六胺改性的纳米晶纤维素（CNC-N16）复合膜的力学性能和水蒸气阻透效果优于相应的十二胺和正辛胺。Three amide-based cellulose nanocrystals （CNC） were synthesized, which were introduced into ethylene-vinyl acetate copolymer （EVA） forming composite membrane via solution blending. UV-visible spectrophotometer, electronic universal testing machine and water vapor permeability instrument were used to characterize the optical, mechanical and water vapor barrier properties of the composite film. The surface morphology of thermo-compression treated film was observed using atomic force microscopy. The introduction of CNC may decrease the transmittance of the film, however, when the CNC content was 5%, the transmittance could be reserved as 90%. Thermcrcompression could increase the uniformity of CNC in EVA matrix, which may reduce the decrease in transmittance by 2 % - 3 %. With increasing content of CNC, the tensile strength of CNC/EVA film increased, but the WVTR values decreased. At the same CNC content, the mechanical and water vapor barrier property of hexadecylamine based film were better than those of dodecylamine and octylamine based film.

关 键 词：乙烯-醋酸乙烯酯共聚物 酰胺化纳米晶纤维素 阻透性 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]