粘度法测定竹材薄壁组织和维管束中纤维素的分子量  

Determination of molecular weight of parenchymal tissue and vascular bundle cellulose in bamboo by viscosimetry

作　　者：洪宏[1] 周蔚虹[1] 喻云水[1,2] 贾春华[1] 

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004 [2]竹业湖南省工程研究中心,湖南长沙410004

出　　处：《中南林业科技大学学报》2017年第1期112-117,共6页Journal of Central South University of Forestry & Technology

基　　金：国家级林业科学技术推广项目;汽车内饰件用纤维制造技术应用示范(2012-63);国家林业公益性行业科研专项"热塑性竹纤维复合基材关键技术研究"(201404512)

摘　　要：为测定竹材薄壁组织和维管束中纤维素的分子量,通过从毛竹中分离出薄壁组织和维管束,分别从中提取出纤维素,采用铜乙二胺(CED)粘度法再对两组织中提取出的PTC和VBC分子量进行测定。结果表明:VBC分子聚合度为1 001,粘均分子量达到1.6×105,远高于PTC分子;将得到的结果与XRD测定结果对比,表明测得的VBC结晶度为67.9%,大于PTC的60.3%,纤维素大分子的晶区比例(结晶度)随着纤维素分子量的增加而增大。因此,维管束更适于作为制取竹纤维的原料。To measure the molecular size of cellulose between parenchymal tissue and vascular bundle in bamboo, in this research, the molecular weight of parenchymal tissue cellulose（PTC） and vascular bundle cellulose（VBC） extracted from parenchymal tissue and vascular bundle were determined by CED viscosimetry. The results showed that the VBC polymerization degree was 1001, and the viscosity average molecular weight（Mη） reached 1.6×105, much higher than that of PTC molecular＇s. Meanwhile, the obtained results were compared with the XRD results, the comparison showed that the crystallinity of VBC was 67.9%, higher than PTC with a crystallinity of 60.3%, suggesting that the ratio of crystalline region in cellulose macromolecule increased with the increase of the molecular weight. As a result, the vascular bundle is more suitable for producing bamboo fiber.

关 键 词：薄壁组织 维管束 PTC VBC 粘度 分子量 

分 类 号：S785[农业科学—林学] S795