Tsagkalias Ioannis S, Manios Triantafyllos K, Achilias Dimitris S
Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
Polymers (Basel). 2017 Sep 8;9(9):432. doi: 10.3390/polym9090432.
The synthesis of nanocomposite materials based on poly(methyl methacrylate) and graphene oxide (GO) is presented using the in situ polymerization technique, starting from methyl methacrylate, graphite oxide, and an initiator, and carried out either with (solution) or without (bulk) in the presence of a suitable solvent. Reaction kinetics was followed gravimetrically and the appropriate characterization of the products took place using several experimental techniques. X-ray diffraction (XRD) data showed that graphite oxide had been transformed to graphene oxide during polymerization, whereas FTIR spectra revealed no significant interactions between the polymer matrix and GO. It appears that during polymerization, the initiator efficiency was reduced by the presence of GO, resulting in a reduction of the reaction rate and a slight increase in the average molecular weight of the polymer formed, measured by gel permeation chromatography (GPC), along with an increase in the glass transition temperature obtained from differential scanning calorimetry (DSC). The presence of the solvent results in the suppression of the gel-effect in the reaction rate curves, the synthesis of polymers with lower average molecular weights and polydispersities of the Molecular Weight Distribution, and lower glass transition temperatures. Finally, from thermogravimetric analysis (TG), it was verified that the presence of GO slightly enhances the thermal stability of the nano-hybrids formed.
本文介绍了基于聚甲基丙烯酸甲酯和氧化石墨烯（GO）的纳米复合材料的合成方法，采用原位聚合法，以甲基丙烯酸甲酯、氧化石墨和引发剂为原料，在合适的溶剂存在下（溶液法）或不存在溶剂（本体法）进行反应。通过重量法跟踪反应动力学，并使用多种实验技术对产物进行适当表征。X射线衍射（XRD）数据表明，在聚合过程中氧化石墨已转化为氧化石墨烯，而傅里叶变换红外光谱（FTIR）显示聚合物基体与氧化石墨烯之间没有显著相互作用。似乎在聚合过程中，氧化石墨烯的存在降低了引发剂效率，导致反应速率降低，通过凝胶渗透色谱（GPC）测量，所形成聚合物的平均分子量略有增加，同时差示扫描量热法（DSC）测得的玻璃化转变温度升高。溶剂的存在导致反应速率曲线中的凝胶效应受到抑制，合成出平均分子量较低、分子量分布多分散性较低且玻璃化转变温度较低的聚合物。最后，通过热重分析（TG）证实，氧化石墨烯的存在略微提高了所形成纳米杂化物的热稳定性。
