为开发纤维素基可降解膜材料，以酸解微晶纤维素的方式制备了纳米纤维素（NCC），并以其为增强相，羟丙基甲基纤维素（HPMC）为成膜基质，甘油为增塑剂，通过流延法制备了复合膜。考察了NCC质量分数对复合膜性能的影响，所得NCC的产率为37.42%，结晶度较微晶纤维素（MCC）有所提高。复合膜的形貌、结晶结构、化学键分析结果显示，NCC在基质中均匀分散，NCC与HPMC之间存在着较强的相互作用。性能测试结果表明，当NCC质量分数为8%时，复合膜的抗拉强度提高了50.61%，水蒸气透过率下降了15.27%，阻氧性能提高了36.04%；因此，NCC可有效提高HPMC膜的力学性能和阻隔性能，且对其透光率也有所改善。

For the development of cellulose based biodegradable film material,nanocellulose (NCC) is prepared by acid hydrolysis of microcrystalline cellulose.A composite membrane is prepared by casting process with NCC as a reinforcing phase,hydroxypropyl methyl cellulose (HPMC) as film-forming material and glycerol as plasticizer.The effect of NCC content on the properties of the composite membrane is investigated.The yield of NCC is 37.42% and the crystallinity of NCC is higher than that of microcrystalline cellulose.Analysis on the morphology,crystal structure and chemical bond of the composite membrane shows that NCC disperses uniformly in the matrix,and there exists a strong interaction between NCC and HPMC.The performance tests indicate that the tensile strength of the composite membrane can increase by 50.61%,the water vapor permeability will decrease by 15.27% and oxygen resistance can increase by 36.04% when NCC content is 8%.Therefore,NCC can improve effectively the mechanical properties and barrier properties of HPMC membrane,and can also improve certainly its transmission rate.

刘莹(1970-),男,硕士,教授,研究方向为生物化学及天然高分子材料,373432601@qq.com。