Preparation of carbon nanotube/epoxy composite films with high tensile strength and electrical conductivity by impregnation under pressure

Based on the production of a carbon nanotube (CNT) assembly, a new technique is developed for preparing CNT/epoxy (EP) composite films with high tensile strength and electrical conductivity. CNTs are synthesized by floating catalyst spray pyrolysis. After self-assembling into a hollow cylindrical assembly, CNTs are drawn and wound on a rotating drum to form a uniform CNT film. EP resin solutions of different concentrations are used to fill into the pores within the film under different pressures and form composite films after hot-press curing. The permeability of the EP resin and thus the interfacial bonding between the CNT and the EP resin are studied by varying the concentration of the EP resin solution and the pressure used for impregnation. Under optimal preparation conditions, the composite film contains CNTs of a high content of 59 wt.%, and shows a high tensile strength of 1.4 GPa and a high electrical conductivity of 1.4x10^5 S·m^-1, 159% and 309% higher than those of the neat CNT film, respectively.     

一种新型稀土光转换材料的合成及其与农膜(PE)相容性研究

合成了铕与长链羧酸(SA)、二苯甲酰甲烷(DBM)、邻菲罗啉(phen)形成的四元配合物,用元素分析(EA)、红外光谱(FT-IR)、氢谱(1HNMR)和紫外光谱(UV)对所合成的铕配合物进行了袁征;由于长链羧酸的引入,配合物在氯仿等挥发性有机溶剂中具有好的溶解性,为与高分子基体复合创造了条件;配合物在波长342nm激发下,发出以铕的特征发谢谱线612nm左右为主的强荧光,实现了由紫外光向植物需要的红光的转换.