Wang Qiang, Ma Fengyun, Tian Hu, Song Yuping, Xu Wenqing, Tang Jun
Center for Physics and Chemistry Analysis, Xinjiang University, Urümqi 830046, China.
Se Pu. 2011 May;29(5):462-5. doi: 10.3724/sp.j.1123.2011.00462.
Inverse gas chromatography was applied to the characterization of the surface properties of polybutadiene rubber (PBR). Four n-alkanes (C6, C7, C8 and C9-alkanes) were chosen as the apolar probes to characterize the dispersive component of surface free energy. Dichloromethane, trichloromethane, acetone, ethyl acetate, diethylether and tetrahydrofuran were chosen as the polar probes to detect the Lewis acid-base parameters. It was found that the dispersive components of surface free energy were 47.07, 46.46, 45.85, 45.60 and 45.09 mJ/m2 at 303, 313, 323, 333 and 343 K, respectively. The results showed that the surface free energy decreased linearly with the increase of temperature. The Lewise acidic number Ka of PBR was 0.34, and the basic number Kb was 1.77. The fact Kb/Ka >1 means that the surface of PBR was amphoteric with dominant basic character and the total ability of the surface to acid-base interactions was 2.11. The free energies of adsorption -deltaG(a)s and -deltaH(a)s by Lewis acid-base interaction were also figured out.
采用反相气相色谱法对聚丁二烯橡胶（PBR）的表面性能进行了表征。选择四种正构烷烃（C6、C7、C8和C9 - 烷烃）作为非极性探针，以表征表面自由能的分散成分。选择二氯甲烷、三氯甲烷、丙酮、乙酸乙酯、乙醚和四氢呋喃作为极性探针，以检测路易斯酸碱参数。结果发现，在303、313、323、333和343 K时，表面自由能的分散成分分别为47.07、46.46、45.85、45.60和45.09 mJ/m2。结果表明，表面自由能随温度升高呈线性下降。PBR的路易斯酸性数Ka为0.34，碱性数Kb为1.77。Kb/Ka >1这一事实表明PBR表面具有两性，且碱性占主导，表面酸碱相互作用的总能力为2.11。还计算了通过路易斯酸碱相互作用的吸附自由能 -ΔG(a)s和 -ΔH(a)s。
