具有定制下临界溶液温度和独特管状结构的水溶性共聚物的还原氧化石墨烯复合材料。
Reduced graphene oxide composites with water soluble copolymers having tailored lower critical solution temperatures and unique tube-like structure.
机构信息
College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen 518060, PR China.
Key Laboratory of Optoelectronic Devices and System of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, People's Republic of China.
出版信息
Sci Rep. 2017 Mar 14;7:44508. doi: 10.1038/srep44508.
Nanohybrids of graphene with water soluble polymer were synthesized using 'grafting from' method. GO, prepared by modified Hummers' method, was first reacted with sodium azide. Alkyne-terminated RAFT-CTA was synthesized by reaction of propargyl alcohol and S-1-dodecyl-S'-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate. RAFT-CTA was grafted onto the GO sheets by facile click-reaction and subsequently, N-isopropylacrylamide (NIPAM) and N-ethyleacrylamide (NEAM) were polymerized on graphene sheets via RAFT polymerization method. The respective copolymers with different ratios were also prepared. The nanohybrids were characterized by FTIR, XRD, TGA, Raman, SEM, and AFM. Both SEM and AFM clearly showed rod-like structures for rGO-PNEAM. XRD showed a small peak at 2θ = 19.21°, corresponding to d-spacing ≈ 4.6 Å. In addition, the nanohybrids showed a very broad temperature range for the LCST in water between ca. 30 and 70 °C.
采用“从接枝”法合成了石墨烯与水溶性聚合物的纳米杂化物。首先，通过改良的 Hummers 法制备氧化石墨烯（GO），然后与叠氮化钠反应。通过丙炔醇和 S-1-十二烷基-S'-(α,α'-二甲基-α"-乙酸)三硫代碳酸酯的反应合成了炔基封端的 RAFT-CTA。RAFT-CTA 通过简便的点击反应接枝到 GO 片上，然后通过 RAFT 聚合方法在石墨烯片上聚合 N-异丙基丙烯酰胺（NIPAM）和 N-乙基丙烯酰胺（NEAM）。还制备了具有不同比例的相应共聚物。通过 FTIR、XRD、TGA、Raman、SEM 和 AFM 对纳米杂化物进行了表征。SEM 和 AFM 均清楚地显示出 rGO-PNEAM 的棒状结构。XRD 在 2θ=19.21°处显示出一个小峰，对应于 d 间距≈4.6 Å。此外，纳米杂化物在水中的 LCST 具有很宽的温度范围，约为 30 至 70°C。
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