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采用反相气相色谱技术测定了聚丁二烯橡胶的表面性质。以正己烷、正庚烷、正辛烷、正壬烷作为非极性探针测定其表面色散自由能,以二氯甲烷、三氯甲烷、丙酮、乙酸乙酯、乙醚和四氢呋喃作为极性探针测定其路易斯酸碱常数。经计算得出聚丁二烯橡胶在303、313、323、333和343 K的表面色散自由能分别为47.07、46.46、45.85、45.60和45.09 mJ/m2。结果表明,聚丁二烯橡胶表面色散自由能随着温度的升高呈线性降低,路易斯酸常数Ka为0.34,碱常数Kb为1.77,总酸碱作用能力2.11,该聚合物为弱碱性Lewis两性聚合物材料。此外还计算出聚丁二烯橡胶的酸碱作用吸附自由能(-ΔGas)和吸附焓(-ΔHsa)。
The surface properties of polybutadiene rubber were determined by reversed-phase gas chromatography. The free surface energy of dispersion was measured with n-hexane, n-heptane, n-octane and n-nonane as polar probes, and dichloromethane, chloroform, acetone, ethyl acetate, ether and tetrahydrofuran as polar probes Needle determination of its Lewis acid-base constant. The calculated free surface energy dispersions of polybutadiene rubber at 303, 313, 323, 333 and 343 K were 47.07, 46.46, 45.85, 45.60 and 45.09 mJ / m2, respectively. The results showed that the surface free dispersion of polybutadiene rubber linearly decreased with the increase of temperature. The Lewis acid constant Ka was 0.34, the basic constant Kb was 1.77 and the total acid-base activity was 2.11. The polymer was weakly Lewis Amphoteric polymeric materials. In addition, the acid-base adsorption-free energy (-ΔGas) and the enthalpy of adsorption (-ΔHsa) of polybutadiene rubber were also calculated.