非共价功能化石墨烯改性PLA薄膜的制备

Preparation of Poly(lactic acid) Nanocomposite Film Modified with Noncovalently Functionalized Graphene

以双十二烷基二甲基溴化胺非共价修饰还原石墨烯(DDAB–RGO)为纳米填料,通过溶液铸膜法制备了聚乳酸/功能化石墨烯(PLA/DDAB–RGO)纳米薄膜。用傅立叶变换红外光谱和扫描电子显微镜对DDAB–RGO及纳米复合薄膜的化学结构及形貌进行了表征,并对纳米薄膜的结晶性能、力学性能、热稳定性等进行了测试分析。结果表明,DDAB–RGO与PLA具有良好的相容性,均匀分散于PLA基体中,在较低DDAB–RGO含量时对PLA膜起到了纳米增强的作用,当其含量为0.2%时,PLA/DDAB–RGO纳米薄膜的拉伸强度、拉伸弹性模量比纯PLA膜分别提高了21%和36%。同时DDAB–RGO的加入还改善了PLA的结晶性、热稳定性。

Reduced graphene oxide (RGO) was noncovalently functionalized with didodecyl dimethyl ammonium bromide (DDAB)by simple phase transfer method,and then with the resulting DDAB–RGO as a nanofiller,a series of poly(lactic acid)(PLA) nanocomposite films were prepared by solution compound and casting method. The structure and morphology of these nanocomposite films were characterized by Fourier transform infrared spectroscopy and scanning electron microscope,and the crystallization behavior,tensile mechanical performance,thermal stability properties of these films were also tested. The results show that thegood compatibility between DDAB–RGO and PLA,a homogeneous dispersion of DDAB–RGO in PLA,and hence enhancement in mechanical strength can be achieved. When the content of DDAB–RGO is 0.2%,the tensile strength and tensile modulus of PLA/DDAB–RGO nano films are increased by 21% and 36% respectively compared with that of pure PLA films. Meanwhile,the incorporation of DDAB–RGO cao also improve the crystallization behavior,thermal stability,and antistatic property of PLA.