چكيده لاتين :
Experimental design of Taguchi was used to optimize the irradiation conditions of UHMWPE/PET composite. Four radiation process variables; fibres percentage, radiation type, radiation dose and post irradiation thermal treatment temperature have been considered. According to the variables and levels, the Lg orthogonal array was selected. Analysis of variance on the physico-mechanical properties and gel content of the samples illustrated that among variables, fibre percentage has affected the properties of the composite more than the other variables in a way that with its increase the samplesי
properties will decrease, therefore zero was considered as an optimum level for fibre percentage. Results indicated that better properties can be achieved by EB-irradiation,
compared with y-irradiation, and the optimum level of radiation dose is 125 kGys. Although post-irradiation thermal treatment temperature affected the sample properties insignificantly but its optimum value was 11 DoC. The results of this research indicated that irradiation of composite, reduced physical properties, increased the percentage of crystallinity
and enhanced the wear resistance. According to the reduced properties of PET fibreיs tensile test, the mechanical properties of irradiated composite diminished. Scanning electron microscopy showed that non-homogeneous dispersion of fibres in the matrix and poor interfacial adhesion between fibres and matrix, caused reduction of composite
mechanical properties. FTIR Analysis confirmed that cross-linking and oxidation
occurred in composite radiation process.
