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高速搅拌对淀粉/聚乙烯 醇共混物溶液成膜性能的影响*

2016-09-26
摘 要 淀粉与聚乙烯醇(PVA)溶液在 高速搅拌拌下共混,可大大改善澱粉/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.澱粉 /PVA共混體 系在高速攪拌前后的光譜分析、顯微觀察、分子量 及流變性能的測定表明,這些變 化起因于高速攪拌增加了澱粉中直鏈澱粉的含量,同時提高了澱粉 與PVA共混溶液的穩定性,改善了澱粉/PVA共混物 薄膜的使用性能.
關鍵詞 澱粉,聚乙烯醇,高速攪拌,共混

EFFECT OF HIGH SPEED STIRRING ON THE
PROPERTIES OF STARCH/PVA BLEND SOLUTION

ZENG Xiangcheng, LIU Bailing, LI Kunfu
(State Key Laboratory of Polymer Material Engineering,
Polymer Research Institute of Sichuan Union University,Chengdu 610065)

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 Mw and widens the Mw 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.
Key words Polyvinyl alcohol, Starch blend solution, High speed stirring
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