Physical and mechanical properties of poly(methyl methacrylate) -functionalized graphene/poly(vinylidine fluoride) nanocomposites Piezoelectric β polymorph formation
Physical and mechanical properties of poly(methyl methacrylate) -functionalized graphene/poly(vinylidine fluoride) nanocomposites Piezoelectric β polymorph formation
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DOI：
10.1016/j.polymer.2010.09.067
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发表时间：
2010-11-12
期刊：
影响因子：
4.6
通讯作者：
Nandi, Arun K.
中科院分区：
文献类型：
--
作者：
Layek, Rama K.;Samanta, Sanjoy;Nandi, Arun K.
聚采用原子转移自由基聚合（ATRP）和水合肼还原的方法从氧化石墨烯（GO）制备了（甲基丙烯酸甲酯）官能化的石墨烯（MG）。PMMA在侧面和底面聚合导致MG片高度增加，MG层在复合材料形成过程中变得更薄，从而剥离。多晶型PVDF的形成纳米复合材料的热稳定性显著提高，玻璃化转变温度（Tg）的提高幅度很大（21 ℃）储能模量增加了124%，断裂应力增加了157%，杨氏模量增加了321%。MG和变程跳跃模型表明电导率是由晶粒间的隧穿和晶粒间的跳跃贡献的（C）2010 Elsevier Ltd版权所有
Poly(methyl methacrylate) -functionalized graphene (MG) is prepared from graphene oxide (GO) using atom transfer radical polymerization (ATRP) and reducing with hydrazine hydrate PMMA causes an Increase of height of MG sheet for polymerization of MMA at side and basal planes MG layers become thinner for exfoliation during composite formation Graphene sheets enhance piezoelectric beta-polymorph PVDF formation MG sheets nucleate PVDF crystals and a gradual decrease of a phase occurs with a concomitant rise of beta phase Thermal stability of nanocomposites increases significantly and the T-g increase is really large (21 degrees C) Storage modulus shows an increase of 124% stress at break 157% and Young s modulus 321% for 5% MG Parallel orientation of graphene sheets changes to random orientation for high graphene content It exhibits conducting percolation threshold at 3 8% MG and variable range hopping model suggests that conductivity is contributed from the intergrain tunnelling and hopping between the grains (C) 2010 Elsevier Ltd All rights reserved