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首先利用功能化α-二亚胺钯催化剂催化乙烯进行链“行走”配位聚合,获得含有2-溴代异丁酰溴末端基团的超支化聚乙烯(HBPE-Br),然后以其为大分子引发剂引发甲基丙烯酸甲酯(MMA)进行原子转移自由基聚合(ATRP),获得HBPE-b-PMMA嵌段共聚物,并对其在甲苯中非共价剥开天然石墨获得石墨烯甲苯溶液的能力进行了考察.氢核磁共振(1H-NMR)和凝胶渗透色谱(GPC)分析证实,已将PMMA嵌段引入HBPE结构中;紫外-可见光谱(UV-Vis)分析表明,所得共聚物在甲苯中可有效剥开天然石墨获得稳定的石墨烯甲苯溶液,石墨烯浓度可高达0.071 mg/mL;高分辨透射电镜(HRTEM)、原子力显微镜(AFM)和拉曼光谱分析共同表明:所获得的石墨烯结构完整、表面缺陷少,厚度为2~4层.该方法所得石墨烯甲苯溶液可望在聚合物/石墨烯纳米复合材料领域获得应用.
Firstly, the functionalized α-diimine palladium catalyst was used to catalyze the coordination polymerization of ethylene with “walk” to obtain HBPE-Br containing 2-bromoisobutyryl bromide end groups. It is a macromolecular initiator initiated methyl methacrylate (MMA) atom transfer radical polymerization (ATRP) to obtain HBPE-b-PMMA block copolymer, and its non-covalent stripping of natural graphite in toluene obtained Graphene and toluene solution were investigated.The results of 1HNMR and GPC confirmed that the PMMA block was introduced into the HBPE structure.The results of UV-Vis analysis , The obtained copolymer can effectively peel off natural graphite in toluene to obtain a stable graphene toluene solution with a graphene concentration of up to 0.071 mg / mL. High resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM) and Raman spectroscopy The graphene obtained by this method is expected to be used in the field of polymer / graphene nanocomposites. The results show that the obtained graphene has a complete structure with few surface defects and a thickness of 2 to 4. The obtained graphene toluene solution is expected to be used in the field of polymer / graphene nanocomposites.