紫外线屏蔽PDA/BC/PVB复合透明薄膜的制备及性能  

Preparation and properties of UV-shielding PDA/BC/PVB composite transparent films

作　　者：晋玉霞[1] 刘永超[1] 任小逆 刘恒源 潘玮[2] JIN Yuxia;LIU Yongchao;REN Xiaoni;LIU Hengyuan;PAN Wei(Department of Materials Engineering of Zhengzhou Technical College,Zhengzhou 450121,China;School of Materials&Chemical Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]郑州职业技术学院材料工程系,郑州450121 [2]中原工学院材料与化工学院,郑州450007

出　　处：《工程塑料应用》2024年第8期52-57,共6页Engineering Plastics Application

基　　金：河南省高等学校重点科研项目(24A430051)。

摘　　要：聚乙烯醇缩丁醛(PVB)薄膜制品在包装材料领域得到了广泛应用,然而PVB材料的光降解导致材料的应用价值降低,因此,设计防紫外线PVB复合材料被认为是实现其应用价值的必要条件。以盐酸多巴胺(DA)、细菌纤维素(BC)和PVB为原材料,首先基于DA的氧化自聚合,在BC表面原位沉积聚多巴胺(PDA)对BC改性,得到PDA/BC纳米复合材料,然后通过溶液共混和涂膜工艺将PDA/BC与PVB共混,制备了PDA/BC/PVB复合纳米薄膜,并使用扫描电子显微镜(SEM)、紫外-可见红外分光光度计、万能材料试验机、傅里叶变换红外光谱以及X射线衍射仪研究了PDA/BC的添加量对PDA/BC/PVB复合薄膜结构与性能的影响。SEM表明,当DA的质量分数为0.1%时,反应得到的PDA可均匀覆盖在BC的表面,且制备的PDA/BC/PVB复合薄膜的截面致密;当PDA/BC质量分数小于1%时PDA/BC在PVB中分散均匀。紫外透过率结果表明,当加入质量分数为1%的PDA/BC时,PDA/BC/PVB复合材料在370 nm处紫外屏蔽效率达到98%,复合透明薄膜表现出优异的紫外线阻隔性能,材料的拉伸强度高达61.2 MPa,远高于原始PVB的强度(39.7 MPa)。光学照片显示PDA/BC的加入并未改变材料的透明性。Polyvinyl butyral(PVB)film products are widely used in the field of packaging materials,however,the photodegradation of polymeric materials leads to the reduction of the application value of the materials,therefore,the design of UV-protected PVB composites chanting is considered as a necessity to realise the value of their applications.Taking dopamine hydrochloride(DA),bacterial cellulose(BC)and PVB as raw materials,firstly,based on the self-oxidative polymerization of DA,poly(dopamine)(PDA)/BC nanocomposites were obtained by in-situ deposition of PDA on the surface of BC after the modification of BC,and then PDA/BC/PVB composite nano-films were prepared by co-mixing PDA/BC with PVB through solution blending and film-coating processes,and the effects of the addition of PDA/BC on the structure and properties of PDA/BC/PVB composite films were investigated by using scanning electron microscopy(SEM),ultraviolet-visible infrared(UV)spectrophotometer,universal materials testing machine,Fourier infrared spectroscopy(FTIR),and X-ray diffractometer(XRD).The SEM analysis demonstrated that when the mass fraction of DA is 0.1%,the generated PDA could uniformly cover the surface of BC.Furthermore,the cross-section of the prepared PDA/BC/PVB composite film exhibite a dense structure,and PDA/BC is uniformly dispersed in PVB when the addition of PDA/BC is less than 1%.The UV transmittance results show that the UV shielding efficiency of PDA/BC/PVB composites at 370 nm is more than 98%after the addition of PDA/BC in the amount of 1%,and the composite transparent films show excellent UV-blocking performance.The tensile strength of the material at this time is as high as 61.2 MPa,much higher than that of the original PVB(39.7 MPa).Optical photographs showed that the addition of PDA/BC does not change the transparency of the material.

关 键 词：聚乙烯醇缩丁醛 原位聚合 聚多巴胺 紫外线屏蔽 纤维增强 

分 类 号：TQ317[化学工程—高聚物工业]