纳米TiO_(2)对PVA/St复合膜性能的影响

Effects of Nano-TiO_(2) on the Properties of PVA/St Composite Films

为改善聚乙烯醇/淀粉(PVA/St)复合膜的力学性能、阻隔性能和降解性能,通过溶液浇铸法制备纳米二氧化钛改性的PVA/St复合膜(PVA/St/TiO_(2)),探究Ti O_(2)含量对PVA/St/TiO_(2)复合膜力学性能、水接触角、阻隔性和降解率的影响。结果表明:PVA/St/TiO_(2)复合膜制备成功,当TiO_(2)颗粒含量为1%,PVA/St/TiO_(2)复合膜综合性能较优。相比PVA/St复合膜,PVA/St/TiO_(2)(1%)的拉伸强度高达31.2 MPa,提高39.3%。PVA/St/TiO_(2)(1%)的水接触为110°,具有疏水性。PVA/St/TiO_(2)(1%)对水蒸气和氧气的透过率分别为3.2 g/(cm·s·Pa)和203 cm^(3)/(cm^(2)·d·0.1 MPa)。PVA/St/TiO_(2)(1%)经过120 d的降解率约为63%,与PVA/St复合膜相比提高14.5%。

In order to improve the mechanical properties, barrier properties and degradation properties of Polyvinyl alcohol/starch(PVA/St) composite films, nano-titanium dioxide modified polyvinyl alcohol/starch(PVA/St/TiO_(2))composite films were prepared by solution casting method. The effects of TiO_(2)content on the mechanical properties,contact angle, barrier properties and degradation rate of PVA/St/TiO_(2)composite films were investigated. The results show that PVA/St/TiO_(2)composite films are successfully prepared. When the TiO_(2)particle content is 1%, PVA/St/TiO_(2)composite film has better comprehensive performance. Compared with PVA/St composite films, the tensile strength of PVA/St/TiO_(2)(1%) is up to 31.2 MPa, increased by 39.3%. The water contact of PVA/St/TiO_(2)(1%) is 110° showing hydrophobicity. The water vapor and oxygen transmission rates of PVA/St/TiO_(2)(1%) are 3.2 g/(cm·s·Pa) and 203 cm^(3)/(cm^(2)·d·0.1 MPa),respectively. The degradation rate of PVA/St/TiO_(2)(1%) is about 63% after 120 d, which is 14.5% higher than that of PVA/St composite films.