| 摘要 |
Disclosed herein is a water-soluble fully biodegradable material which is a product formed by melting a mixture containing starch, polyol, and water-containing polyvinyl alcohol, wherein the polyvinyl alcohol is hydrophilic polyvinyl alcohol and the content of the polyol is from 0.1 wt% to lower than 10 wt% based on the total weight of the mixture. The material is a product formed from a molten mixture and has a melting temperature of 130-190°C which is much lower than its decomposition temperature of 250-400°C, therefore the material can achieve molten state, and can achieve real extrusion granulation and injection molding. The injection molded product prepared from the inventive material has excellent charpy impact strength, elongation at break, and tensile yield strength, and extremely high biodegradation degree.
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