【摘要】 淀粉与聚乙烯醇（ＰＶＡ）溶液在高速搅拌下共混，可大大改善淀粉／ＰＶＡ共混薄膜的力学性能、透明性与耐水性，对其生物降解性有明显的影响．淀粉／ＰＶＡ共混体系在高速搅拌前后的光谱分析、显微观察、分子量及流变性能的测定表明，这些变化起因于高速搅拌增加了淀粉中直链淀粉的含量，同时提高了淀粉与ＰＶＡ共混溶液的稳定性，改善了淀粉／ＰＶＡ共混物薄膜的使用性能．更多还原

【Abstract】 Polyvinyl alcohol (PVA) can be degraded by bacteria from various soil sources and its structure is somewhat similar to that of starch.It is an available way of blending polyvinyl alcohol (PVA) with starch to develop biodegradable materials.The high speed stirring is a suitable method while blending of PVA and starch to prepare the biodegradable materials with better properties required.The effect of high speed stirring on the properties of starch/PVA blend solution was studied by means of spectrophotometry,microscopy,molecule weight analysis and rheometry etc.The experimental results indicate that changes are found on the chains of PVA and starch after conducting high speed stirring,which causes a modification in the properties of starch/PVA blend solution.The degrading effect of high speed stirring on starch and PVA agrees to the common mechano chemical degrading feature.The high speed stirring breaks the side chain of starch and eventually increases the amylose content in starch solution.The high speed stirring also lowers the M w and widens the M w distribution of PVA.The dispersion of starch in PVA is improved by high speed stirring and the interaction between starch and PVA is strengthened,resulting in an improvement of the mechanical properties,transparency and water repellence of starch/PVA blend film.更多还原