聚乳酸改性糯玉米淀粉的制备及表征  

Preparation and characterization of polylactic acid modified waxy corn starch

作　　者：任逸 仇丹[1,2] 姚利辉 庞嘉敏[1] 周坤 何宇鹏 REN Yi;QIU Dan;YAO Lihui;PANG Jiamin;ZHOU Kun;HE Yupeng(School of Materials and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,Zhejiang,China;Zhejiang Research Institute,Tianjin University,Ningbo 315201,Zhejiang,China;Ningbo Research Institute,Dalian University of Technology,Ningbo 315016,Zhejiang,China;School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,China)

机构地区：[1]宁波工程学院材料与化学工程学院,浙江宁波315211 [2]天津大学浙江研究院,浙江宁波315201 [3]大连理工大学宁波研究院,浙江宁波315016 [4]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《精细化工》2024年第3期679-686,696,共9页Fine Chemicals

基　　金：宁波市自然科学基金项目(2021J142)。

摘　　要：以糯玉米淀粉为原料、异辛酸亚锡为催化剂,在丙交酯熔融体系中制备了聚乳酸改性糯玉米淀粉。建立了聚乳酸改性糯玉米淀粉取代度的^(1)HNMR测试方法,以取代度为响应值,反应时间、反应温度、丙交酯添加量为考察因素,通过单因素和响应面实验优化了聚乳酸改性糯玉米淀粉的合成工艺,得到最优工艺为:反应时间12.46 h,反应温度111.75℃,丙交酯添加量为淀粉质量的258%,预测最大取代度为0.0253,通过实际操作条件调整后实际取代度为0.0238。对最优条件下制备的聚乳酸改性淀粉进行了系列表征,证实聚乳酸改性糯玉米淀粉的颗粒结构没有被完全破坏,晶型、相对分子质量等性能优于溶剂法传统技术制备的聚乳酸改性糯玉米淀粉。Polylactic acid modified waxy corn starch was prepared in the melting system of lactide using waxy corn starch as raw material and stannous iso-octoate as catalyst.A ^(1)HNMR method for determining the substitution degree of polylactic acid modified waxy corn starch was established.The optimum process was obtained as follows:reaction time 12.46 h,reaction temperature 111.75℃,and the addition amount of lactide was 258%of starch mass.The maximum degree of substitution was predicted to be 0.0253 and adjusted by actual operation to be 0.0238.A series of characterization for polylactic acid modified starch obtained under optimal conditions proved that the particle structure was not completely destroyed,with the crystal shape and relative molecular mass better than those prepared by traditional solvent method.

关 键 词：丙交酯 聚乳酸改性糯玉米淀粉 取代度 响应面实验 颗粒结构 淀粉化学品 

分 类 号：O636.12[理学—高分子化学]