红外辐照对魔芋葡甘聚糖膜力学性能的影响

以魔芋葡甘聚糖（KGM）粉末为研究对象,分别以分子量、水分含量的内在性质和红外辐照温度、时间、强度外部条件为参考因子,考察其与KGM溶胶成膜后力学性能的相关性,并通过扫描电镜分析,观察膜截面的微观形貌.实验结果表明：经红外处理,KGM膜力学性能的下降百分比与分子量呈明显线性正相关,与水分含量呈负相关;较高辐照温度、光强度和较长辐照时间显著破坏膜的力学性能;膜截面的有序完整片层破坏成碎裂小块和多孔结构.合理选择高品质KGM,控制红外辐照条件,可改善KGM膜的力学性能.

Effect of Infrared Radiation on Mechanical Properties of Konjac Glucomannan Films

Using konjac glucomannan powder as object, the correlation of molecular weight , moisture content, irradiation temperature, time, and strength with mechanical properties of KGM films was stud- led. The cross-section morphology of KGM films was observed using scanning electron microscopy. The results showed that after infrared treatment, percentage decline in mechanical properties of films showed a linear positive correlation with molecular weight of KGM, and a linear negative correlation with water con- tent. High infrared irradiation temperature, strength, and time could damage the mechanical properties of films, and the complete of lamellar fragmentation on films cross-section destructed into small pieces and porous structure. Using high quality KGM can improve the mechanical properties of KGM films under controlled infrared irradiation conditions.