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一微有交联的聚甲基丙烯酸甲酯试样在甲苯-乙醇和丙酮-水混合溶剂中的平衡溶胀比用容量法作直接测量,当非溶剂的体积分数分别为γ=0.17(乙醇)和0.02(水)时,平衡溶胀比均出现极大,与在稀溶液中的粘度和渗透压行为完全一致.在θ溶剂中的平衡溶胀比Q_θ是与溶剂-非溶剂对无关的常数,因而溶胀数据可以用一维溶胀因子X_(溶胀)= (Q/Q_θ)~(1/3)表示.从实验结果得到聚甲基丙烯酸甲酯的溶度参数δ=10.0.
The equilibrium swelling ratio of a slightly crosslinked polymethylmethacrylate sample in toluene-ethanol and acetone-water mixed solvents is directly measured by the volumetric method. When the volume fraction of the non-solvent is respectively γ = 0.17 (ethanol) And 0.02 (water), respectively, the equilibrium swelling ratio appears to be extremely large, in good agreement with the viscosity and the osmotic pressure behavior in a dilute solution.The equilibrium swelling ratio in θ solvent, Q_θ, is a constant unrelated to the solvent-nonsolvent pair and thus The swelling data can be expressed as the one-dimensional swelling factor X_ (swelling) = (Q / Q_θ) ~ (1/3). From the experimental results, the solubility parameter δ of polymethylmethacrylate = 10.0.