聚乙烯醇/原花青素共混物薄膜的制备及其性能研究

Preparation and properties of polyvinyl alcohol/procyanidin blends

采用天然植物中提取的原花青素(OPC)作为自由基捕获剂,通过溶液浇铸法将OPC与聚乙烯醇(PVA)共混制膜。利用差示扫描量热仪(DSC)、热重分析仪(TGA)、全反射傅里叶红外光谱仪(FTIR)、双束紫外可见分光光度计(UV-Vis)、小角X射线散射仪(SAXS)等仪器研究共混物薄膜的热力学稳定性、紫外屏蔽性能、透光率以及结晶性能等。结果表明,1.0%~2.0%原花青素的加入可有效提高PVA的热稳定性,拓宽熔融加工窗口,且PVA/OPC薄膜能保持优异的力学性能、透光率以及紫外屏蔽性能。小角X射线散射的结果进一步证明OPC的加入抑制PVA的结晶。

Proanthocyanidins(OPC)extracted from natural plants was used as free radical trapping agent and blended with polyvinyl alcohol(PVA).The PVA/OPC composite films were produced by solution casting.The thermodynamic stability of the composite films was measured by using differential scanning calorimetry(DSC)and thermogravimetric analyser(TGA).The properties of UV shielding and light transmission were investigated using double-beam UV-Vis spectrophotometer(UV-Vis).And the crystalline properties were characterized using small angle X-ray scattering(SAXS).The results show that the addition of OPC inhibited the crystallization of PVA,the thermal stability and the melt processing window of the composite films were effectively improved by adding 1.0%-2.0%OPC.And the PVA/OPC composites films exhibited excellent mechanical properties,light transmittance and UV shielding properties.