纳米SiO_(2)/聚乳酸复合膜的性能及机理  

Properties and Mechanism of Nano SiO_(2)/Polylactic Acid Composite Membrane

作　　者：宫贵贞[1] 石荣乐 GONG Guizhen;SHI Rongle(School of Materials and Chemical Engineering,Xuzhou University of Technology,Xuzhou,Jiangsu 221018,China)

机构地区：[1]徐州工程学院,材料与化学工程学院,江苏徐州221018

出　　处：《塑料》2025年第1期113-119,共7页Plastics

基　　金：徐州工程学院科研课题(XKY2018124)。

摘　　要：聚乳酸(PLA)是一种生物可降解高分子材料,无毒无害,绿色环保,可作为石油基不可降解高分子材料的替代品。但是,PLA的热稳定性较差、硬度较大,并且较脆,限制了其应用。采用3-氨基丙基三乙氧基硅烷(KH550)对二氧化硅(SiO_(2))进行改性,得到改性SiO_(2)(MSiO_(2))。采用溶液流延成膜制备了SiO_(2)/PLA及MSiO_(2)/PLA复合膜,利用FTIR、DSC、SEM及TG等方法分析产物的结构、微观形貌及热稳定性等,另外,还分析了MSiO_(2)对PLA的影响机制。结果表明,改性后的纳米SiO_(2)与PLA的相容性得到提高,复合膜的力学强度得到增强。当MSiO_(2)的含量为5.7%时,MSiO_(2)/PLA复合膜的拉伸强度及断裂伸长率均达到最大,其值分别为45.56 MPa及2.10%,与纯PLA相比,分别提高了89.83%及61.54%,而且,改性复合膜的熔融温度降低,热分解温度显著提高。Polylactic acid(PLA)was a biodegradable polymer material,which was non-toxic,harmless,green,safe and environmentally friendly,and could be used as a substitute for petroleum based materials.Silica(SiO_(2))was modified with 3-aminopropyltriethoxysilane(KH550),and the modified silicon dioxide(MSiO_(2))was prepared.SiO_(2)/PLA and(MSiO_(2))/PLA composite films were prepared by solution casting.The structure and properties of the products were characterized and analyzed by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC),scanning electron microscopy(SEM),etc.The influence mechanism was studied.The results showed that the compatibility between MSiO_(2)and PLA was improved,and the mechanical strength of the composite membrane prepared by adding MSiO_(2)to polylactic acid was enhanced.When the content of MSiO_(2)was 5.7%,the tensile strength and elongation at break of the composite membrane reached the maximum,which were 45.56 MPa and 2.10%,respectively,89.83%and 61.54%higher than that of pure PLA.Compared with pure polylactic acid,the melting temperature of the modified composite membrane decreased,but the thermal decomposition temperature increased significantly.

关 键 词：聚乳酸 SiO_(2) 3-氨基丙基三乙氧基硅烷 复合膜 性能 机理 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]