静电纺丝法制备孔结构可调的交联聚酰亚胺/聚甲基丙烯酸甲酯复合纤维膜

Preparation of polyimide/polymethyl methacrylate fibrous membrane with adjustable cross-link pore structure by electrospinning

以聚酰胺酸(PAA)为电纺液,利用静电纺丝法制备纤维膜并加热使其亚胺化以制得聚酰亚胺(PI)纤维膜;以聚甲基丙烯酸甲酯(PMMA)为电纺液,PI纤维膜为接收基底进行纺丝,加热得到无纺型复合纤维膜。通过调节PI/PMMA复合纤维膜的加热时间,制备了孔结构可调的交联复合纤维膜。采用红外光谱(FT-IR)、扫描电镜(SEM)、孔隙率测试、力学性能测试对纤维膜的结构、形态进行表征;采用热重分析(TGA)对其耐热性能进行测试。结果表明:具有交联孔结构的复合纤维膜相比于PI纤维膜,其纤维间出现了熔接使拉伸强度大幅提高;通过改变加热时间可以控制薄膜孔隙率的大小。

Polyamic acid（PAA）non-woven fibrous membrane was prepared from polyamic acid solution utilizing electrospinning technology,which was further imidized into polyimide（PI）non-woven fibrous membrane by heat treatment.The composite fibrous membrane was prepared by electrospinning polymethyl methacrylate（PMMA）solution on the surface of PI non-woven fibrous membrane followed by further heat treatment.PI/PMMA composite fibrous membrane with adjustable welding pore size was prepared by adjusting heat treatment program.Fourier transform infrared spectroscope（FTIR）,scanning electron microscopy（SEM）,porosity test and mechanical property test were employed to study the structure and morphology of membrane.Thermal gravimetric analysis（TGA）was used to characterize its thermal property.The results showed that the PI/PMMA membrane appeared improved tensile strength,lower porosity and contact angle compared to PI membrane.The film porosity can be controlled by changing the heating time.