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以壳聚糖和聚乙二醇为原料,通过物理共混的方法制备了一系列质量比的壳聚糖/聚乙二醇共混膜,通过红外光谱,微机差热分析对微波辐射后的共混膜的结构进行了表征。研究结果表明,微波辐射加强了壳聚糖与聚乙二醇分子之间的氢键作用,氢键束缚和限制了共混膜中聚乙二醇熔融态的自由平动,致使共混膜在聚乙二醇熔点之上表现出固-固相变行为。壳聚糖/聚乙二醇(90/10-70/30)共混膜作为食品保鲜膜,可承受2 min,600 W的微波辐射。
Chitosan and polyethylene glycol were used as raw materials to prepare a series of mass ratio chitosan / polyethylene glycol blend films by physical blending. The effects of microwave irradiation The structure of the blend membrane was characterized. The results show that the microwave radiation enhances the hydrogen bonding between chitosan and polyethylene glycol molecules, and the hydrogen bonding restrains the free translation of polyethylene glycol melt in the blend membrane. As a result, Above the melting point of polyethylene glycol shows solid-solid phase transition behavior. Chitosan / polyethylene glycol (90 / 10-70 / 30) blend film as food cling film, can withstand 2 min, 600 W microwave radiation.