竹纤维含量对其增强聚己内酯复合材料性能的影响

Effect of Mass Fraction on Properties of Bamboo Fibers Reinforced Polycaprolactone Composites

将竹纤维(BF)与聚己内酯(PCL)熔融共混,通过模压工艺制备了竹纤维增强聚己内酯(PCL/BF)复合材料。研究和分析了BF含量对复合材料力学性能、热稳定性以及熔融、结晶行为的影响。结果表明,随着BF含量的增加,复合材料的拉伸性能、冲击性能和断裂伸长率均先升高后降低,当BF含量为40%(质量分数,下同)时,分别达到最大值13.6 MPa、14.64 kJ/m^2和7.03%;复合材料的热稳定性与BF和PCL的配比息息相关,受热过程中对彼此热解会产生抑制作用;BF的加入在一定程度上降低了PCL的熔融温度和结晶度,但结晶温度提高;BF含量超过40%时,BF含量对复合材料吸水率的影响显著,且随着BF含量的增加,复合材料的吸水率快速增长。

Composites of bamboo fiber （BF） and polycaprolactone （PCL） were fabricated via hotpress process. The effect of BF on the mechanical properties, thermal stability, and melting and crystallization behavior had been studied. The mechanical properties of the composites increased first and then decreased with increasing mass fraction of BF. The impact strength, tensile strength, and the elongation at break respectively achieved the maxima of 14. 64 kJ/m^2, 13.6 MPa, and 7.03 % at a BF mass fraction of 40 %. BF and PCL mutually inhibited the thermal decomposition each other. And the addition of BF decreased the melting temperature and degree of crystallinity of PCL, but increased the crystallization temperature. When the BF mass fraction was higher than 40 ~//0, the water absorption rate of the composites rapidly increased.