Study On Preparation And Properties Of Polybutene Composites

Polybutene (PB) having excellent flexibility, impact resistance, stress crack resistance, creep resistance, heat resistance to stress, moisture barrier properties and electrical insulation properties, is important material alternative to other polyolefins, so its development prospects are very considerable. On the other hand, its price is very expensive, which becomes one reason of rapid development of applications like the other polyolefin. while nano-materials and fibers have excellent performance in some aspects, adding the sound amount of nano-SiO2and kenaf to prepare PB composites not only study new varieties materials of more practical value but also widen its scope of applications have a very important significance.In this paper, nano-SiO2, silicone (KH-570) nano-SiO2, amino (KH-550) nano-SiO2, epoxy group (KH-560) nano-SiO2contents and kenaf (three modified) added to polybutene prepare into PB/nano-SiO2composites. Its mechanical properties, rheological properties, crystallization properties of the fracture surface and thermal stability are researched.In this paper, the analysis on PB/nano-SiO2and PB/kenaf composites mechanical properties found that PB/amino nano-SiO2, the best overall mechanical properties of the composites. Impact strength reaches its maximum83.8KJ·m-2; the tensile strength reaches20.57MPa, and the flexural strength reaches21.94MPa compared PB to95.34%,7.58%,23.95%when the amino nano-SiO2content is3phr. The other hand, comparative analysis of the three modified PB/kenaf composites found the PB/kenaf (alkali)/PP-g-MAH tensile strength and bending strength are the best, impact properties is worst, while the best of the impact strength is PB/kenaf (alkali/graft-PBA). Using POM, DSC, XRD test composites crystal morphology and crystal transition, the results showed that PB and its composites exhibits a black cross extinction phenomenon; starting crystallization temperature, the crystallization peak temperature (Tp) corresponding to the maximum crystallization rate of the crystallization process and the final completion of the crystallization temperature (Te) were slightly higher than PB, the corresponding increase of3.4°C,5.0°C,5.6°C when the amino nano-SiO2content is3phr in the PB/amino nano-SiO2composites. The WAXD the pattern shows quadrangular Ⅱ polymorph ((200) at11.9°2θ) to the hexagonal I polymorph transformation reached stabily after about48h.SEM test fracture surface rough, found rough sections of the PB and PB/nano-SiO2composites are typical of ductile fracture. Due to the relatively uniform distribution of the amino nano-SiO2in the matrix so that the the PB/amino nano-SiO2sectional increase of roughness than PB. TGA test thermal performance found that the weightlessness temperature of PB and composites are in the range of320～500℃. Thermal stability of PB/nano-SiO2composites decreased, but not obvious compared to PB.