| Irradiation processing technique and stress-induced dispersion of nanoparticles were adopted in this paper for enhancing the properties of commodity PET fiber in hopes of bring it possessing the properties possessed by the high performance PET fibers.A new idea regarding improvement of moisture regain and antistatic properties of PET fabric through irradiation was put forward. The approach adopted is to introduce some oxygen containing groups (-COOH, -OH etc) on molecular chain of PET by means of UV light or corona discharge in air or in presence of O3, then complex it through hydrogen bonding with PVA. For the purpose of improving the washing resistance, the PET/PVA complex is treated with borax or boric acid solution (conc.3g/l, pH value 8.0) and cured at 120-130 (℃), 5 min. The experimental results show that the approach proposed is viable. The moisture regain of PET/PVA complex fabric is increased from 0.28% to 2%, the time of half decay of static electricity is decreased from 172 sec to 40 sec. No remarkable difference on mechanical properties between it and the untreated PET fabric.In order to enhance the mechanical and thermal properties of PET, PET/nano-TiO2 composite was prepared with a pan milling type equipment. The pan mill designed by SKLPME can be used efficiently for pulverizing both brittle and ductile materials, could exert reasonably strong pressures and shearing forces on the materials owing to its particular structure. The experimental results show that the average aggregate size of TiO2 is reduced from 168nm to 71nm and evenly dispersed in PET matrix. The structure and properties of PET/nano-TiO2 composite werestudied through DSC, WAXD, TEM, SEM and PM, together with mechanical test. The crystallization rate of PET/nano-TiO2 composite is greater than that of PET, the tensile strength of PET/TiO2 (100/4) fiber is increased from 3.32 g/d to 4.16 g/d, the modulus increased from 1.97×103 g/d to 3.44×103 g/d, the thermal shrinkage drops from 3.7% to 2.4%.
|
PDF Full Text Request