聚丙烯腈纤维紫外光接枝丙烯酰胺及其性能研究

Study on Polyacrylonitrile Fibre Grafted with Acrylamide Via UV-induced Photografted Polymerization and Its Performance

为提高聚丙烯腈(PAN)纤维的阻燃性能,采用紫外光接枝技术,以二苯甲酮(BP)为光引发剂将丙烯酰胺(AM)单体接枝到PAN纤维上,详细研究了AM及BP质量分数、接枝时间及接枝距离对PAN纤维光接枝AM的接枝率(GP)的影响规律,并利用傅里叶红外光谱(FTIR)、X-射线衍射光谱(XRD)、扫描电子显微镜(SEM)对接枝前后的PAN纤维进行了表征,同时,采用热重(TG)及差示扫描量热(DSC)对纤维的热性能进行了研究。结果表明:随着AM及BP质量分数的增大、接枝时间的延长及接枝距离的增大,GP均呈现先增大后减小的趋势,接枝AM后PAN纤维的热性能有所提高,800℃时的残炭量增加,极限氧指数值增大了33.3%。

In order to improve the flame retardancy of polyacrylonitrile(PAN) fiber, acrylamide(AM) as grafting monomer induced by benzophenone(BP) was grafted onto PAN fiber through UV-induced photo-grafting technology. The effects of AM and BP concentration, grafting time and lighting distance on the grafting percentage(GP) were studied in detail. The PAN fibers before and after grafting were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) and scanning electron microscope(SEM), and the thermal properties of the fibers were studied by thermogravimetric(TG) and differential scanning calorimetry(DSC). The results show that the GP increases first and then decreases with the increase of AM and BP concentration, the extension of grafting time and the increase of lighting distance. The thermal properties of PAN fiber were improved after being grafted with AM. The char residue increased at 800 ℃ and the limiting oxygen index(LOI) increased by 33.3%.