基于α-PVA/s-PVA/NaCl共混体系的薄膜制备和表征

以两种等规度不同的聚乙烯醇（PVA）为原料，水作溶剂，加入不同含量的氯化钠（NaCl），在室温干燥、水洗、再干燥后制成无规聚乙烯醇（a-PVA）／间规聚乙烯醇（s-PvA）共混薄膜。采用差示扫描量热仪（DSC）、傅立叶红外光谱仪（FT-IR）、力学性能测试以及热失重分析（TG）等方法对薄膜进行表征。结果显示，随NaG和s-PVA的含量变化，共混膜的吸收峰和熔点规律变化，并在3％（w）NaC1时获得最佳拉伸强度和弹性模量，分别为47．54MPa与1．95GPa。共混膜的热性能随着s-PVA含量增加而提高，s-PVA所占比例从0提高到40％时，相应地薄膜的熔点从231.4℃增至239.8℃。

Preparation and characterization of the blend films derived from a-PVA/s-PVA/NaCl system

In this paper,two PVAs with different tacticities were dissolved in solvent H_2O with addition of different content of NaCl.The solutions were dried at room temperature,washed and dried again to obtainα-PVA/s-PVA blend films.The effects on properties of blend films caused by different ratio ofα-PVA/s-PVA and different content of NaCl were investigated by different scanning calorimetry(DSC),fourier transform infrared spectrum(FT-IR),measurement of mechanical properties and thermogravimetry(TG).Results showed that with the change of NaCl and s-PVA content,ab- sorbance of FT-IR spectra and Tm ofα-PVA/s-PVA films changed regularly and the film had the best tensile strength and elastic modulus,47.54 MPa and 1.95 GPa respectively at 3%(w)NaCl;Tm of the film increased with s-PVA in- creased,when the s-PVA content was increased from 0 to 40%,Tm of the film increased from 231.4℃to 239.8℃correspondingly.