SiO2/聚（3-羟基丁酸酯-co-4-羟基丁酸酯）薄膜研究

SiO2/poly（3-hydroxybutyrate-co-4-hydroxybutyrate） Film

目的研究纳米SiO2对可生物降解聚(3-羟基丁酸酯-co-4-羟基丁酸酯)(P34HB)包装膜结晶行为和力学性能的影响。方法采用溶液浇铸法制备SiO2/P34HB纳米复合薄膜,利用红外光谱仪(FTIR)、扫描电镜(SEM)、正置热台显微镜(POM)、差示扫描量热仪(DSC)和万能力学试验机等研究纳米SiO2对P34HB结构、结晶性和力学性能等的影响。结果纳米SiO2在P34HB中起到异相成核的作用,SiO2/P34HB复合膜的结晶速率和结晶度得到明显改善。相比P34HB包装膜,当纳米SiO2质量分数为2%时,SiO2/P34HB复合膜的弹性模量和拉伸强度分别提高了72.7%和60.9%。结论获得了纳米SiO2改善可生物降解聚(3-羟基丁酸酯-co-4-羟基丁酸酯)包装膜结晶度和力学性能的最佳掺杂比例参数。

The work aims to research the effect of nano-SiO2 on the crystallization behavior and mechanical properties of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)(P34 HB)packaging film.SiO2/P34 HB nanocomposite films were prepared by solution casting method.The effects of nano-SiO2 on the structure,crystallinity and mechanical properties of P34 HB were analyzed by FTIR,SEM,POM,DSC and mechanical universal testing machine.The results indicated that,nano-SiO2 played a heterogeneous nucleation role in P34 HB.The crystallization rate and crystallinity of SiO2/P34 HB composite films were significantly improved.Compared with P34 HB packaging film,the elastic modulus and tensile strength of SiO2/P34 HB composite film were increased respectively by 72.7%and 60.9%,when the mass fraction of nano-SiO2 was 2%.Finally,the optimum doping ratio parameters of nano-SiO2 for improving the crystallinity and mechanical properties of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate)packaging film were obtained.