原位聚合法制备GO/PAN复合膜及其性能的研究

Preparation and properties of graphene oxide/polyacrylonitrile films by in-situ polymerization

通过原位聚合法制备了氧化石墨烯/聚丙烯腈(GO/PAN)聚合物,采用水相成膜法制得GO/PAN复合膜,探讨了聚合过程中GO用量对PAN的单体转化率(Y)和增比黏度(ηsp)的影响,研究了GO/PAN复合膜的结构和性能。结果表明:GO的加入使PAN的ηsp和Y都有所提高;当加入GO质量分数为2%时,相对于PAN,其Y提高了13.4%,ηsp提高了77.3%;GO片层均匀地分布在GO/PAN复合膜基体当中,并且GO与PAN之间存在一定的作用力;与纯PAN相比,GO/PAN复合膜的结晶度、热稳定性和力学性能都得到一定程度提高,当GO质量分数为2%时,所制得的GO/PAN复合膜的结晶度为47.9%,最大分解温度304℃,600℃时质量保持率为49.8%,强度为6.0 MPa。

A graphene oxide （ GO）/polyacrylonitrile （ PAN） polymer was synthesized by in-situ polymerization and was pro-duced into GO/PAN composite film by aqueous film formation .The effect of GO amount on the monomer coversion rate （ Y ） and specific viscosity （ ηsp ） of PAN was discussed during the process of polymerization .The structure and properties of the GO/PAN compostie films were investigated .The results shown thatηsp and Y of PAN were improved due to the addition of GO;Y was increased by 13.4% andηsp by 77.3% as the mass fraction of GO was 2% based on pure PAN.The GO sheets were dispersed uniformly in GO/PAN composite film matrix , and there were some interactions between GO sheets and PAN chains , as compared with those of pure PAN, the crystallinity, the thermal stability and mechanical properties of GO/PAN composite film were improved;and the GO/PAN composite film had the crystallinity of 47.9%, the maximum decomposition temperature of 304 ℃, the weight maintenance rate of 49.8%at 600 ℃ and tensile strength 6.0 MPa as the mass fraction of GO was 2%.