不同聚合度纤维素配比对膜结构和性能的影响  

Impacts of the Ratio of Cellulose with Different Degree of Polymerization on Structure and Properties of Cellulose Membrane

作　　者：李金宝[1] 杨国鑫[1] 余伟燕 修慧娟[1] 张向荣[1] 

机构地区：[1]陕西科技大学轻工与能源学院陕西省造纸技术及特种纸品开发重点实验室,陕西西安710021 [2]塞纳医药包装材料(昆山)有限公司,江苏昆山215300

出　　处：《纸和造纸》2014年第7期25-27,共3页Paper and Paper Making

摘　　要：研究纤维素聚合度与纤维素膜的微观结构、结晶结构和强度性能等之间的关系,通过不同聚合度纤维素配比这一方法更准确地探讨了聚合度大小对纤维素膜结构和性能的影响。研究结果表明:配比为3:1时,膜结构最疏松,其次是1:3,而1:1时结构最致密。纤维素Ⅰ经NMMO工艺形成的再生纤维素其晶体结构为纤维素Ⅱ,不能生成纤维素Ⅰ;且结晶度大幅下降,晶粒尺寸也有一定减小。配比为1:1时,纤维素膜的结晶度和拉伸强度最大,但伸长率随平均聚合度的下降不断减小。Influence of degree of polymerization （DP） on the microstructure, crystal structure and strength properties of cellulose membrane were investigated, especially a method of mixing different DP cellulose at different proportion to discuss more accurately effect of DP was put forward. The results showed that the membrane at the proportion of 3：1 possesses the loosest structure, followed by 1：3 and 1：1 in turn. Cellulose＇s crystalline structure had changed during NMMO process, and transformed from cellulose Ⅰ in cellulose pulps to cellulose Ⅱ in regenerated cellulose membrane, but could not form cellulose Ⅰ again. In addition, it can be found that crystal decrease remarkably, and the lattice size also reduces to a certain extent. Cellulose membrane at the proportion 1：1 is of the highest crystal and tensile strength, but its elongation keeps a continuous decline as mean DP decreasing.

关 键 词：纤维素膜 NMMO 聚合度 结构 性能 

分 类 号：TS711[轻工技术与工程—制浆造纸工程]