改性氧化石墨烯/聚酰亚胺复合薄膜的制备及性能研究

Preparation and property of modified graphene oxide/polyimide composite films

以4,4'-二氨基二苯醚(ODA)、3,3',4,4'-二苯甲酮四羧酸二酐(BTDA)为单体,以苯基异氰酸酯改性氧化石墨烯(pGO)为填料,通过原位聚合法成功制备了改性氧化石墨烯/聚酰亚胺复合薄膜。采用红外光谱对其结构进行了表征,并研究其拉伸性能和热稳定性能。结果表明,当填料含量为1%时复合薄膜的拉伸性能最佳,拉伸强度(T_S)达到69.1MPa,拉伸模量(T_M)达到2.31GPa,相对于纯PI薄膜其拉伸强度提高9.3%,拉伸模量提高19.1%;此时复合薄膜的残炭率(Y_c)为60.1%,比纯PI薄膜提高2.7%,最大分解速率时的温度(T_(max))为587℃,比纯PI薄膜提高约8℃,玻璃化转变温度(T_g)为361℃,说明该复合薄膜的拉伸性能和热稳定性能得到一定程度的提高。

Modified graphene oxide/polyimide composite films were fabricated by using, 4’-diaminodiphenyl ether(ODA), 3,3’,4,4’-benzophenonetetracarboxylic dianhydride(BTDA)as monomer as well as phenyl isocyanate modified graphene oxide(pGO)as filler through in-situ polymerization. The structure of the composite films were characterized by IR spectroscopy. Tensile and thermal stability properties of composite films were investigated. The results indicated that the composite films showed improved tensile properties and thermal stability. The optimum tensile properties were obtained when the filler content was 1 wt%, the tensile strength(TS)reached 69.1 MPa,tensile modulus(TM)reaches 2.31 GPa, which was increased 9.3% and 19.1% compared to polyimide film. The carbon residue rate(Yc)reached 60.1% which was increased 2.7%, the temperature of maximum decomposition rate(Tmax)reaches 587 o C which was increased 8℃, and the glass transition temperature(Tg)was 361°C.