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

The weight-average molecular weight(M_w),number average molecular weight(M_n),molecular weight distribution(M_w/M_n) 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) M_w,M_n,M_w/M_n and IV of cellulose diacetate flake could be determined accurately by GPC/RI/LALLS/DV;2) the M_w and M_n were higher and M_w/M_n range was wider for cellulose diacetate flake made from soft wood pulp and short cotton linter;3) when cellulose diacetate flake was pyrolyzed,the M_w/M_n range became wider,IV decreased,and the pyrolyzed polymerization might emerge.