摘要
利用溶液共混的方法将碳纳米管(CNT)及石墨烯(G)同时加入到热致液晶聚酯中制备纳米复合材料.通过透射电镜(TEM)研究纳米粒子的分散及形貌.采用荧光光谱及拉曼光谱研究碳纳米填料与热致液晶聚酯基体之间存在π-π相互作用.利用电子万能试验机(EUTM)研究了材料的拉伸性能,由于CNT与G与基材之间作用力强,且CNT与G间的协效作用能有效地实现应力转移,同时加入CNT及G有助于提升复合材料的拉伸强度.动态热机械分析(DMA)数据表明,同时添加CNT与G对于复合材料的固定率影响不大,但会降低回复率;同时复合材料的回复应力也得到显著的提升.
A main chain thermotropic liquid crystalline polyester named poly（4,4＇-bis（6-hydroxyhexyloxy）binphenyl phenylsuccinate（PBDPS） reinforced by the combination of carbon nanotube（CNT,1-dimensional carbon nanofiller） and graphene（G,2-dimensional carbon nanofiller） was prepared in solution. Transmission electron microscopy was used to study the dispersion of the carbon nanofillers and morphology of the resulting nanocomposites. Interaction between two carbon nanofillers was observed,particularly for the nanocomposite with 2 wt% of CNT and G（PCNT1G1（2%））. Raman and fluorescence spectrometry were used to investigate the π-π interaction between the carbon nanofillers and PBDPS chains. The phenomenon of fluorescence quenching and the dramatically decreased intensity of Raman absorption peaks confirmed the formation of π-πinteraction between the nanofillers and PBDPS. Electronic universal testing machine was utilized to evaluate the tensile strength of the materials. The results suggested that due to the interaction between CNT and G,the mechanical properties of all composites were reinforced considerably. The addition of only 0. 5 wt% CNT and G enhanced the tensile strength of the composites by 27. 6% compared to pure PBDPS. With increasing the content of the carbon nanofillers,the tensile strength of the composites decreased gradually. Shape memory behavior and recovery stress were recorded by dynamic mechanical analysis,and it was found that the addition of CNT and G together considerably enhanced the shape recovery stress and maintained the shape fixing ratio effectively. The recovery stress of the composites was improved by 150% compared to pure PBDPS at the addition of 2 wt% of the nanofillers. On the other hand,both CNT and G exhibited negative effect on the chain mobility of PBDPS,especially with high content of the carbon nanofillers,thus decreasing the shape recovery ratios.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2016年第12期1758-1762,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51273115)资助项目
关键词
液晶高分子
形状记忆
Π-Π相互作用
纳米复合材料
Liquid crystalline polymer
Shape memory behavior
π-π Interaction
Carbon nanocomposite
