摘要
为提高淀粉的热塑性能,优化其加工工艺,以超音速气流粉碎机制备微细化淀粉,确定微细化淀粉的最佳塑化条件,并利用扫描电镜、力学测试和示差扫描量热仪表征热塑性微细化淀粉。结果表明,微细化淀粉的热塑化最佳条件为:丙三醇与聚乙烯醇体积比为5∶1,微细化淀粉含量80%,共混温度160℃,单螺杆转速40r/min。热塑性微细化淀粉呈现均匀的微观形貌,其拉伸强度为17.36MPa,断裂伸长率138.29%,于130～155℃温度下熔融,加工性能良好。
Micronized starch (MST) was prepared by using supersonic blast air current pulverizer, and the optimized plasticization condition of micronized starch was confirmed. At the same time, the structure and properties of thermoplastic micronized starch were characterized by using scanning electron microscopy, mechanical test and differential scanning calorimetry. The best plasticization condition of micronized starch was: glycerol/PVA(Polyvinyl Alcohol)(V/V)=5∶1, 80% MST, blending temperature 160℃ and screw speed (40 r/min). Scanning electron microscopy(SEM) photograph showed that the surface of thermoplastic micronized starch sheet was smooth and its tensile strength and breaking elongation are 17.36 MPa and 138.29% respectively. Differential scanning calorimetry(DSC) curve indicated that thermoplastic micronized starch melt at 130~155℃ and its mechanic properties were excellent.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2004年第5期86-88,共3页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家高技术研究发展计划(863计划)项目(2002AA6Z3181)
湖北省自然科学基金项目(2003ABA102)
关键词
微细化淀粉
热塑性
结构
性能
micronized starch
thermoplastic
structure
property
