Study Of The γ-Ray Irradiation-induced Grafting On Structure And Properties Of Ultrahigh Molecular Weight Polyethylene Fiber

Ultra-high molegular weight polyethylene(UHMWPE) fiber is the third generation of high performance fiber after carbon fiber and aramid fiber. It have been researched for many years. But UHMWPE fiber and it’s composites don’t get a good application.In order to solve the restriction of UHMWPE fibers, physical、 chemical or physics and chemistry way was used to modify the fiber. low temperature plasma, oxidation treatment, corona discharge treatment, radiation induced surface grafting and laser method are the most common ways to modify the surface of fiber. Among these ways, radiation induced surface grafting can avoid the problem of waste of energy and pollution to enviroment.The main content of this thesis is the surface modification of UHMWPE fiber’surface with γ-ray. And also, the pre-irradiation dose, reaction temperature, graft monomer and reaction time are discussed on the grafting efficiency of UHMWPE fiber.On the basic of introduction and experiment, following studies on UHMWPE fibers are carried out:1、After the preirridiation with γ-ray, UHMWPE fiber is lightly damaged. The main effect factor to the fiber’s tensile strength is grafting efficiency of different monomer. With the growth of grafting efficiency, the tensile strength get lower, which means the damage is much more bigger.2、Fourier transform spectrum (FTIR) was employed to charaeter the change of chemical content of the fiber:seanning electromicrograph (SEM) is employed to show the change of surface proterties of the fiber.3、With growth of reaction time, monomer concentration, pre-irridiation dose and reaction temperature, the grafting degree increased gradually.