基于AlCl3/ZnCl2水体系溶解交联纤维素制备高湿稳定性薄膜

Construction of Cellulose Films with High Wet-stability Based on Dissolving-co-crosslinking Cellulose in an AlCl3/ZnCl2 Aqueous System

关键词:  纤维素薄膜  溶解  交联  湿稳定性

Key Words:cellulose film  Dissolving  Crosslinking  Wet stability

摘要:本研究以AlCl3/ZnCl2/H2O为纤维素溶剂，1,4-丁二醇二缩水甘油醚为交联剂，漂白桉木溶解浆为纤维素原料，室温下溶解交联纤维素制备了薄膜。得到的纤维素薄膜透明（在可见光波范围，透光率可达90%），其应力应变分别能达到140.76 MPa 和19.69%。即使在湿环境下，其湿应力应变也能达到34.72 MPa和67.33 %；在水中浸泡7天后仍能保持形状稳定，且润胀率仅为94%，表现出优异的抗水性，并能稳住24 h以盛装水、牛奶和酱油等液体；同时它还表现出较低的水蒸气透过率（615.0 g/m2 day）和透氧率（4.15 ? 10-3/cm3 m2 day pa）。该透明薄膜具有高湿稳定性且湿强度优异，有望应用于包装与食品保鲜领域。

Abstract:In this study, AlCl3/ZnCl2/H2O was used as cellulose solvent, 1,4-butanediol diglycidyl ether (BDDE) was introduced as crosslinking agent, and bleached eucalyptus dissolving pulp was dissolved and crosslinked at room temperature to prepare the cellulose film. The film had the advantages of high strength, high wet stability, high transparency and biodegradability. Moreover, it was expected to replace petroleum-based plastics in the field of packaging and food preservation. The stress-strain energies of the obtained cellulose films reached 140.76 MPa and 19.69%, respectively. Even in the wet environment, the wet stress and strain could reach 34.72 MPa and 67.33%. After being soaked in water for 7 days, it could still maintain a stable shape, and the swelling rate was only 94%, showing excellent water resistance and being able to hold liquids such as water, milk and soy sauce for 24 hours. It also showed lower water vapor permeability (615.0 g/m2 day) and oxygen permeability (4.15 ? 10-3/cm3 m2 day pa). This transparent film features high moisture stability and excellent wet strength, and is expected to be applied in the fields of packaging and food preservation.