Analysis of Molecular Weight and its Distribution and Intrinsic Viscosity of Cellulose Diacetate Flake by GPC with Multiple Detectors

Abstract

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.