不同粒径氮化硼对聚丙烯复合材料性能的影响

Effect of Boron Nitride with Different Particle Size on Properties of Polypropylene Composite Material

以聚丙烯(PP)为基体、不同粒径氮化硼(BN)为填充物,采用熔融共混的方法制备聚丙烯/氮化硼(PP/BN)复合材料。通过耐冲击性能、弯曲性能、拉伸性能分析和热分析,研究BN粒径对PP/BN复合材料性能的影响。结果表明:不同粒径BN均可提高复合材料的冲击强度,试验所用填充PP的两种粒径BN,在填充量为5%时均能让复合材料的冲击强度达到约3.65 kJ/m2,比纯PP基体的冲击强度增加了38.8%;与20μm粒径的BN相比,填充5μm粒径的BN可显著提高复合材料的抗弯折能力;填充两种粒径的BN,均能降低复合材料的拉伸强度和断裂伸长率,且在所研究范围内,复合材料的拉伸强度和断裂伸长率与BN粒径关系不大;复合材料的熔体流动速率随两种粒径BN填充量的增大而表现出先增大后逐渐减小的趋势;填充两种粒径BN,均能提高复合材料的结晶温度,降低复合材料的结晶度,但熔融温度变化不大。

Polypropylene/boron nitride composites were prepared by melt blending with different particle sizes of boron nitride as filler and polypropylene as matrix.The effects of BN particle sizes on the properties of PP/BN composites were studied by using impact resistant properties,bending properties,tensile properties and thermal analysis.The results showed that different particle sizes of BN could improve the impact strength of the composites,the impact strength of the composites reached about 3.65 kJ/m~2,increased by 38.8%comparing to materials only with PP matrix,when the filling amount of BN was 5%during the experiment process.Compared with the particle size of 20μm,the flexural strength of the composites could be significantly improved by adding 5μm BN.The tensile strength and elongation at break of BN with two kinds of particle sizes decreased,and within the scope of the study,the tensile strength and elongation at break had little relationship with BN particle size.The melt flow rate of the composites first increased and then decreased with the increase of the filling amount of BN with two particle sizes.The BN with two kinds of particle sizes increased the crystallization temperature and reduced the crystallinity of the composites,but the melting temperature changed a little.