Preparation of nanocrystalline cellulose from degreasing cotton and application as reinforcing agent in alginate-starch composite membranes
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摘要: 探究了纳米微晶纤维素对海藻酸盐-淀粉复合薄膜的增强效果。以脱脂棉为原料,采用化学预处理结合超声破碎法制备纳米微晶纤维素（NCC）;以马铃薯淀粉与海藻酸钠为成膜基材,以甘油为增塑剂,将NCC作为增强组分,通过流延法制备复合薄膜。微观形貌观察表明,脱脂棉NCC呈棒状,直径30 nm左右,长径比约为8;对复合膜的机械性能、阻隔性能、光学性能、水溶性、热稳定性和红外光谱检测表明,当NCC的添加量为5%（w/w）时,可以有效提高复合膜的拉伸强度、水溶时间和热稳定性,降低复合膜的透湿系数,而对复合膜的透光性影响不大。Abstract: To explor the enhanced effect of nanocrystalline cellulose( NCC) in alginate- starch based composite films.NCC was prepared from degreasing cotton by chemical pre- treatment combine with ultrasonic disruption. The alginate- starch composite films were prepared by solution casting method,using NCC as enhanced component and glycerol as plasticizer. The microstructure observation showed that NCC from degreasing cotton was rod- like with an aspect ratio about 8,and its diameter was about 30 nm. The mechanical properties,barrier properties,optical properties,water solubility,DSC and FTIR of the composite films were tested,the results indicated that 5%( w / w) NCC can efficiently increase the tensile strength,dissolution time and thermal stability of alginate- starch based films,the water vapor permeability coefficient of the composite film with 5%( w/w) NCC was also reduced,besides,5%( w/w) NCC almost didn't affect the transparency of composite films.
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Keywords:
- nanocrystalline cellulose /
- composite membranes /
- reinforcing agent /
- alginate /
- starch
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