论文部分内容阅读
用甲苯作溶剂,乙醇作沉淀剂,用沉淀分级法对无规立构聚苯乙烯(PSt)进行了分级。用粘度法测定了PSt在甲苯及四氢呋喃(THF)中的[η]以及在甲苯-甲醇,THF-甲醇0溶剂中的[η]_0,用小角激光光散射光度计测定了(?)_w。确定了PSt在25℃甲苯及THF中[η]与(?)_w之间的关系分别为[η]=1.38×10~(-2)(?)_w~(0.72),[η]=3.98×10~(-2)(?)_w~(?)。PSt-THF的第二维利系数A_2与(?)_w之间的关系为A_2=8.91×10~(-2)(?)_w~(?)。通过汁算得到了PSt在溶液中的分子链尺寸。对PSt在甲苯及THF中的溶解情况进行了比较。
Toluene was used as a solvent and ethanol as a precipitating agent, and atactic polystyrene (PSt) was fractionated by precipitation fractionation. The [η] of PSt in toluene and tetrahydrofuran (THF) and the [η] _0 in toluene-methanol and THF-methanol0 solvents were measured by viscometry and the (?) _w was measured by a low angle laser light scattering photometer. It was found that the relationship between [η] and (?) _w of PSt in toluene and THF at 25 ℃ was 1.38 × 10 -2 (?) W 0.72 and [η] = 3.98 × 10 ~ (-2) (?) _w ~ (?). The relationship between the second Willy’s coefficient A 2 of PSt-THF and (?) _w is A 2 = 8.91 × 10 -2 (?) _ W ~ (?). The molecular chain size of PSt in solution was calculated by the juice calculation. The solubilities of PSt in toluene and THF were compared.