用凝胶渗透色谱((GPC)和激光小角光散射(LALLS)联用法对不同牌号的溶聚SBR(S-SBR)和乳聚SBR(E-SBR)的分子量及其分布进行了测定。结果发现,E-SBR的(?)_w较大,分子量分布较宽,有些试样含有少量特大分子,还发现偶联的S-SBR图谱具有双峰。用氢质子核磁共振仪对两者的微观结构进行了表征,其中E-SBR不同试样的微观结构差别较小,而S-SBR不同试样的微观结构则存在明显差异,表明S-SBR链结构具有较大的可调节性。 The molecular weights and their distributions of different grades of S-SBR and E-SBR were determined by gel permeation chromatography (GPC) and laser light scattering (LALLS) .Results It was found that the E-SBR has a large (?) _w, a broad molecular weight distribution, and some samples contain a small amount of extra-large molecules and also found that the coupled S-SBR pattern has bimodal peaks. The structure of S-SBR was characterized. The difference of microstructure of E-SBR samples was small, but the microstructure of S-SBR samples was obviously different, which indicated that the structure of S-SBR chain was greatly regulatable.