Zhu Zhongcheng, Shi Shengjie, Wang Huiliang
College of Chemistry, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875, P. R. China.
Macromol Rapid Commun. 2016 Jan;37(2):187-94. doi: 10.1002/marc.201500573. Epub 2015 Nov 25.
Graphene oxide (GO) is effective in catalyzing a wide variety of organic reactions and a few types of polymerization reactions. No radical chain polymerizations catalyzed by GO have been reported. In this article, we probe the catalytic role and acceleration effect of GO for self-initiated radical chain polymerizations of acrylic acid (AA) in the presence of GO and a pre-existing polymer, poly(N-vinylpyrrolidone) (PVP), from a calorimetric perspective. Gelation experiments and DSC studies show that GO can function as a catalyst to accelerate the radical chain polymerization of AA. Isothermal polymerization kinetic data shows that the addition of GO diminishes the induction periods and increases the polymerization rates, as indicated by the much enhanced overall kinetic rate constants and lowered activation energies. The catalytic effect of GO for the polymerization of AA is attributed to the acidity of GO and the hydrogen bonding interactions between GO and monomer molecules and/or polymers.
氧化石墨烯（GO）能有效催化多种有机反应及几种类型的聚合反应。尚未有关于GO催化自由基链式聚合反应的报道。在本文中，我们从量热学角度探究了在GO和预先存在的聚合物聚（N - 乙烯基吡咯烷酮）（PVP）存在下，GO对丙烯酸（AA）自引发自由基链式聚合反应的催化作用和加速效果。凝胶化实验和差示扫描量热法（DSC）研究表明，GO可作为催化剂加速AA的自由基链式聚合反应。等温聚合动力学数据表明，添加GO可缩短诱导期并提高聚合速率，这表现为整体动力学速率常数大幅提高以及活化能降低。GO对AA聚合反应的催化作用归因于GO的酸性以及GO与单体分子和/或聚合物之间的氢键相互作用。
