摘要
将淀粉和羧甲基纤维素(CMC)混合,加入甘油作为增塑剂,采用流延法制备淀粉/CMC/甘油复合膜。采用SEM、XRD、FT-IR等方法对复合膜的结构进行表征,并测试了复合膜的力学、透光、吸水和降解性能,重点探讨不同甘油添加量(以淀粉和CMC总干质量计,0~30%)对复合膜结构和性能的影响。研究结果表明:淀粉、CMC和甘油为物理共混,甘油的加入可以提高体系的相容性,甘油添加量越多,复合膜断裂面越光滑。随着甘油添加量增加,复合膜的断裂伸长率显著增大,当添加量从0增加到30%时,断裂伸长率由3.39%升高到46.23%,增大了12.6倍。复合膜的透光率、吸水率和水蒸气透过率(WVP)等性能随甘油添加量的增加而提升,当甘油添加量为20%时,600 nm透光率最大可达79.42%,WVP和吸水率分别为5.14×10^(-11) g/(m·s·Pa)和25.46%。体系中甘油添加量的增加还能够加快复合膜的降解速度,当甘油添加量为20%时,复合膜土埋9天后几乎完全降解。甘油添加量为20%时制备的淀粉/CMC/甘油复合膜的力学、光学及可降解性能较优,可以满足食品包装膜的性能要求。
Starch/carboxymethyl cellulose(CMC)/glycerol composite film was fabricated with a casting method by mixing starch CMC and glycerol used as a plasticizer.The structure of the composite film was characterized by SEM,XRD,and FT-IR,and the mechanics,light transmittance,water absorption,and degradation properties of the composite film were studied.The effect of different glycerol addition levels(based on the total dry mass of starch and CMC,0-30%)on the structure and properties of the composite film were mainly investigated.The results showed that starch,CMC,and glycerol were physically blended,and the addition of glycerol improved the compatibility of the system.The more glycerol added,the smoother fracture surface of the composite film was achieved.As the glycerol addition increased,the elongation at break of the composite film significantly increased.When the addition increased from 0 to 30%,the elongation at break increased from 3.39%to 46.23%,which was an increase of 12.6 times.The transmittance,water absorption,and water vapor permeability(WVP)of the composite film increased with increase of glycerol addition.When the addition was 20%,the maximum transmittance at 600 nm reached 79.42%,and the WVP and water absorption were 5.14×10^(-11) g/(m·s·Pa)and 25.46%,respectively.The increase of glycerol addition in the system could also accelerate the degradation rate of the composite film.When the glycerol addition was 20%,the composite film almost completely degraded within 9 days.The results showed that the mechanical,optical and degradable properties of starch/CMC/glycerol composite film were better when the glycerol content was 20%,which could meet the performance requirements of food packaging film.
作者
江东阳
李楠楠
黄海源
周泽广
卢彦越
钟磊
JIANG Dongyang;LI Nannan;HUANG Haiyuan;ZHOU Zeguang;LU Yanyue;ZHONG Lei(School of Chemistry and Chemical Engineering,Guangxi Minzu University,Nanning 530006,China;Guangxi Key Laboratory for Polysaccharide Materials and Modification,Nanning 530006,China;Guangxi Higher Education Institutes Key Laboratory for New Chemical and Biological Transformation Process Technology,Nanning 530006,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2024年第2期94-102,共9页
Chemistry and Industry of Forest Products
基金
国家自然科学基金地区基金项目资助项目(21968008)
广西自然科学基金资助项目(2018GXNSFAA050025)。
关键词
淀粉
羧甲基纤维素
甘油
阻隔性能
可降解性
starch
carboxymethyl cellulose
glycerol
barrier properties
biodegradability
