聚乙烯醇/马来酸酐接枝聚丙烯共混物的热行为研究

采用熔融共混法制备了一种聚乙烯醇(PVA)/马来酸酐接枝聚丙烯(PP-g-MAH)共混物膜,通过差示扫描量热仪研究了共混物膜的结晶和熔融行为。结果表明,随着共混物中PP-g-MAH含量（不超过50 %）的增加，PVA相的结晶和熔融温度升高，结晶度增加，结晶速率增加，而随着PVA含量（超过30 %）的增加,PP-g-MAH的结晶及熔融温度降低，结晶度降低，结晶速率增加。用Ozawa法对共混物中PVA相的非等温结晶动力学研究表明，共混物中PVA相在191~197 ℃开始主期结晶，在173~189 ℃进入次期结晶阶段。

Thermal behavior of Polyvinyl Alcohol/Polypropylene Grafted Maleic Anhydride Blends

Polyvinyl alcohol(PVA)/polypropylene grafted maleic anhydride (PP-g-MAH) blend films were prepared by melting process. The differential scanning calorimetry (DSC) was adopted to develop the crystallization and melting behavior of the blends. Results showed that with the increasing of PP-g-MAH content （less than 50 %）, the crystallization and melting temperature of PVA phase increased, the crystallization rate rose,but crystallinity decreased. While with the increasing of PVA content（more than 30 %）, the crystallization and melting temperature of PP-g-MAH phase decreased, crystallinity decreased, but the crystallization rate increased. The non isothermal crystallization kinetics of PVA phase in the blend was studied according to Ozawa′s theory. Results showed that the primary crystallization of PVA phase was in a temperature range of 191~197 ℃，secondary crystallization was in a temperature range of 173~189 ℃.