摘要
分别用光散射法、Tung法和通用校准法测定了星形SBS的(?)_w,并对不同方法的测定结果进行了分析和比较。用光散射法测得(?)_w为248000,结果与实际相符;但比折光指数增量的实验值与根据加和性假设的计算值之间的相对误差较大(±9.98％),对(?)_w测定值的精确度有一定影响。用GPC法测定(?)_w时,其值偏低,通用校准法和Tung法分别为198 000和191 000。
The weight average molecular weight Mw of star SBS block copolymer was characterized by low angle laser light scattering , Tung method and gel permeation chromatography (GPC), and the results were compared .The Mw determined by light scattering was 248000 in good agreement with the values obtained by GPC . The relative error between the test value by refractive index increment and the calculation value by the assump-tion of linearity addition was a little bigger (±9.98%) which affected the precision of light scattering results. The Mw values obtained by both the universal calibration method (198 000 ) and the Tung method (191 000 )were lower .
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1992年第6期348-351,共4页
China Synthetic Rubber Industry
关键词
光散射
色谱
丁苯橡胶
橡胶
测定
star SBS Mock copolymer
molecuar weight
light scattering method
gel permeation chromatography
