纳米SiO_2与POE协同增韧增强PP三元复合材料的制备及性能研究

Preparation and properties of PP composites via synergetic toughening-reinforcement of POE and nano-SiO_2

利用熔融共混挤出方法制备了聚烯烃热塑性弹性体乙烯-辛烯共聚物(POE)/纳米二氧化硅(nano-SiO2)协同增韧增强聚丙烯(PP)三元复合材料(PP/POE/nano-SiO2)。通过冲击实验、拉伸实验、熔融结晶分析和热失重实验研究了POE与nano-SiO2的协同作用、nano-SiO2的含量对复合材料力学性能、熔融结晶行为和热学性能的影响。研究结果表明,POE与nano-SiO2的协同增韧明显优于POE单独对PP的增韧,nano-SiO2还体现出明显的增强作用。当nano-SiO2的质量分数为2%时,复合材料的室温冲击强度达最大值,其较PP/POE提高了72.6%,而在-35℃下较PP/POE的提高了200%。当nanoSiO2的质量分数为4%时,复合材料的室温拉伸强度达最大值,其较PP/POE增大了38.9%。熔融结晶分析表明,添加nano-SiO2导致复合材料的结晶度增大。热学性能分析表明,nano-SiO2的加入使PP/POE/nano-SiO2三元复合材料的热稳定性提高。

The PP /POE /nano-SiO2 composites were prepared by melt-mixing process. The synergetic toughening-reinforcement effects and the influences of nano-SiO2 contents on the mechanical,melting-crystalline and thermal properties of the PP /POE / nano-SiO2 were investigated by means of impact test,tensiled test,melting-crystalline analysis and thermal gravimetric analysis. The experimental results indicated that the synergetic toughening of the POE and nano-SiO2 has a better performance than that of sole POE. Moreover,nanoSiO2 showed an obvious reinforcement effect to the polymer matrix. Even with 2% mass fraction of the nanoSiO2,the impact strength of PP/POE/nano-SiO2 composites at room temperature( RM) approaches the ultimate value. The impact strength at RM and at- 35 ℃ has been increased by 72. 6% and 200%,compared with the PP /POE,respectively. The tensile strength of PP /POE /nano-SiO2 composite at RM approaches the ultimate value when the mass fraction of nano-SiO2 is 4%,which is increased by 38. 9% compared with the PP /POE.The melting-crystalline analysis showed that the degree of crystalline of PP /POE /nano-SiO2 composites is increased due to nano-SiO2 incorporation. The thermal stability of all the PP /POE /nano-SiO2 composites is improved with the addition of nano-SiO2.