聚丙烯腈/石墨烯纳米复合物的制备、表征及其热性能

采用以水和N,N-二甲基甲酰胺的混合溶剂作反应介质的沉淀聚合法制备了聚丙烯腈/石墨烯纳米复合物。利用傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和广角X射线衍射(XRD)研究了聚丙烯腈/石墨烯复合物的组成、结构、形貌及两组份的相互作用。利用差式扫描量热分析(DSC)研究了聚丙烯腈及纳米复合物的热性能。结果表明,强极性的聚丙烯腈与石墨烯之间存在较强的非共价相互作用;由于石墨烯的加入,聚丙烯腈的玻璃化转变温度提高了30℃;石墨烯添加量为3%(质量分数)时,聚丙烯腈在氮气和空气中的环化反应放热峰值分别提高了3和11℃;石墨烯使聚丙烯腈在热稳定化过程中的环化反应和氧化反应放热峰宽化、缓和。

Preparation,characterization and thermal property of polyacrylonitrile/graphene nanocomposites

Polyacrylonitrile(PAN)/graphene(G) nanocomposites were prepared by deposition polymerization in DMF-H2O media.FT-IR and XRD were used to characterize the composition and structure of graphene,PAN and the nanocomposites.A reasonable noncovalent interaction between PAN and graphene was also observed.SEM and TEM showed that the PAN microspheres were mostly wrapping on the surface of graphene.An unprecedented shift in glass-transition temperature of about 30℃ was obtained for PAN/graphene nanocomposite with 3wt% of graphene.Differential scanning calorimetry(DSC) suggested that the presence of graphene moderated PAN stabilization.For PAN/G nanocomposites,the DSC exotherm of cyclization reaction showed broader exotherm peak and ended at a slight higher temperature.In nitrogen and air atmosphere,the main exotherm peaks of PAN/G(3wt%) nanocomposites shifted to higher temperature of 3 and 11℃,respectively.It was expected that PAN/G nanocomposites was a promising precursor for preparing novel PAN-based carbon material.