Murali Adhigan, Sampath Srinivasan, Appukutti Achuthan Boopathi, Sakar Mohan, Chandrasekaran Suryanarayanan, Suthanthira Vanitha N, Joseph Bensingh R, Abdul Kader M, Jaisankar Sellamuthu N
School for Advanced Research in Polymers (SARP)-Advanced Research School for Technology and Product Simulation (ARSTPS), Central Institute of Plastics Engineering & Technology (CIPET), Ministry of Chemicals & Fertilizers, Govt. of India, Chennai 600032, India.
Department of Materials Science, School of Technology, Central University of Tamil Nadu, Thiruvarur 610101, India.
Polymers (Basel). 2020 Apr 10;12(4):874. doi: 10.3390/polym12040874.
Polymer nanocomposites have been synthesized by the covalent addition of bromide-functionalized graphene (Graphene-Br) through the single electron transfer-living radical polymerization technique (SET-LRP). Graphite functionalized with bromide for the first time via an efficient route using mild reagents has been designed to develop a graphene based radical initiator. The efficiency of sacrificial initiator (ethyl α-bromoisobutyrate) has also been compared with a graphene based initiator towards monitoring their Cu(0) mediated controlled molecular weight and morphological structures through mass spectroscopy (MOLDI-TOF) and field emission scanning electron microscopy (FE-SEM) analysis, respectively. The enhancement in thermal stability is observed for graphene-grafted-poly(methyl methacrylate) (G--PMMA) at 392 °C, which may be due to the influence ofthe covalent addition of graphene, whereas the sacrificial initiator used to synthesize G--PMMA (S) has low thermal stability as analyzed by TGA. A significant difference is noticed on their glass transition and melting temperatures by DSC. The controlled formation and structural features of the polymer-functionalized-graphene is characterized by Raman, FT-IR, UV-Vis spectroscopy, NMR, and zeta potential measurements. The wettability measurements of the novel G--PMMA on leather surface were found to be better in hydrophobic nature with a water contact angle of 109 ± 1°.
通过单电子转移活性自由基聚合技术(SET-LRP),通过溴化物官能化石墨烯(Graphene-Br)的共价加成合成了聚合物纳米复合材料。首次通过使用温和试剂的有效途径用溴化物官能化的石墨被设计用于开发基于石墨烯的自由基引发剂。还比较了牺牲引发剂(α-溴代异丁酸乙酯)与基于石墨烯的引发剂的效率,分别通过质谱(MOLDI-TOF)和场发射扫描电子显微镜(FE-SEM)分析来监测它们的Cu(0)介导的可控分子量和形态结构。在392°C下观察到石墨烯接枝聚甲基丙烯酸甲酯(G-PMMA)的热稳定性增强,这可能是由于石墨烯共价加成的影响,而通过热重分析(TGA)分析,用于合成G-PMMA(S)的牺牲引发剂具有较低的热稳定性。通过差示扫描量热法(DSC)发现它们的玻璃化转变温度和熔点有显著差异。通过拉曼光谱、傅里叶变换红外光谱(FT-IR)、紫外可见光谱、核磁共振(NMR)和zeta电位测量对聚合物官能化石墨烯的可控形成和结构特征进行了表征。发现新型G-PMMA在皮革表面的润湿性测量结果具有更好的疏水性,水接触角为109±1°。