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测定了五个聚苯乙烯级分((?)_η3.2×10~5—2.7×10~6)在丁酮-正己烷体系中的特性粘数,发现高分子量级分的特性粘数-组成曲綫在γ=0.13处出现极大值。简要叙述了自制光电式散射光度计的结构。聚苯乙烯级分在上述混合溶剂体系内光散射测定的结果表明,A_2也在γ=0.13处出现极大。应用溶度参数解释了上述结果。本工作所得聚苯乙烯溶度参数实验值为8.8。 根据在θ-溶剂中A_2=0及Mark-Houwink方程参数α=1/2的条件,从粘度及光散射所测得的聚苯乙烯-丁酮-正己烷体系(30℃)的θ溶剂组成是一致的,γ_θ=0.45。
The intrinsic viscosities of five polystyrene fractions ((?) _η3.2 × 10 ~ 5-2.7 × 10 ~ 6) were measured in methyl ethyl ketone-n-hexane system and the intrinsic viscosities of the high molecular weight fractions The composition curve shows a maximum at γ = 0.13. Briefly describes the structure of self-made photoelectric scattering photometer. The result of light scattering measurement of the polystyrene fraction in the above mixed solvent system shows that A 2 also appears extremely large at γ = 0.13. The above results were explained using the solubility parameters. The experimental results obtained polystyrene solubility parameters of 8.8. According to the conditions of A_2 = 0 in θ-solvent and α = 1/2 of Mark-Houwink equation, θ solvent composition of polystyrene-butanone-n-hexane system (30 ℃) measured from viscosity and light scattering Is the same, γ_θ = 0.45.