摘要
采用凝胶渗透色谱(GPC)/示差(RI)/小角激光光散射(LALLS)/四毛细管示差粘度(DV)三检测器联用技术对二醋酸纤维素片(二醋片)的重均分子量(Mw)、数均分子量(Mn)、分子量分布(Mw/Mn)和特性粘度(IV)进行了测试。结果表明:①采用GPC/RI/LALLS/DV技术可以准确地测试二醋片的Mw、Mn、Mw/Mn和IV;②以软木浆和短棉绒为原料生产的二醋片的Mw、Mn较高、Mw/Mn较宽;③热解后二醋片的Mw/Mn变宽,IV降低,并有裂解分子的聚合现象。
The weight-average molecular weight (Mw), number average molecular weight (Mn), molecular weight distribution (Mw/Mn) and intrinsic viscosity (IV) of cellulose diacetate flake were analyzed by GPC coupled with multiple detectors, including refractometer index (RI) , low angle laser light scattering (LALLS) and four-capillary differential viscosity (DV). The results showed that : 1 ) Mw, Mn, Mw/Mn and IV of cellulose diacetate flake could be determined accurately by GPC/RI/LALLS/DV; 2) the Mw and Mn were higher and Mw/Mn range was wider for cellulose diacetate flake made from soft wood pulp and short cotton linter; 3 ) when cellulose diacetate flake was pyrolyzed, the Mw/Mn range became wider, IV decreased, and the pyrolyzed polymerization might emerge.
出处
《烟草科技》
EI
CAS
北大核心
2008年第10期21-24,共4页
Tobacco Science & Technology
关键词
凝胶渗透色谱
二醋酸纤维素片
分子量分布
特性粘度
Gel permeation chromatography (GPC)
Cellulose diacetate flake
Molecular weight distribution
Intrinsic viscosity