Preparation of telechelic hydroxyl low molecular weight fluoropolymers by reduction reaction was presented. The telechelic carboxyl low molecular weight fluoropolymers were chosen as raw materials which were prepared by oxidative degradation method. The molecular weights of telechelic carboxyl low molecular weight fluoropolymers were about 3700. Then, using lithium aluminum hydride reacted with carboxyl groups to prepare the telechelic hydroxyl low molecular weight fluoropolymers. The effects of reaction temperatures, reaction times, contents of solvent and lithium aluminum hydride were investigated in detail. The structures, Mn and dynamic viscosity of low molecular weight fluoropolymers were analyzed by FTIR, 1H-NMR, GPC and viscometer respectively. Finally telechelic hydroxyl low molecular weight fluoropolymers were prepared. The conversion rate of that reduction reaction was about 95%. The product was a viscous fluid with a dynamic viscosity of 48Pa·s at 50°C.

In this paper, the EPDM/boron mud composites are prepared by changing the amount of boron mud, paraffin oil and coumarone. In order to investigate the effect of the fillers on the properties of composites,the aging-resistance, mechanical properties and SEM of composites are tested and analyzed. The results show that when paraffin oil is 10 phr, coumarone is 3 phr and the boron mud is 20 phr, the composite has optimal properties.Keywords: Boron mud, Coumarone, Paraffin oil, EPDM, Composites