【摘要】 为考察塑木复合材在自然气候条件下的耐候性,采用动态机械热分析技术对塑木复合材在自然气候条件下的动态力学变化特征进行了分析与探讨。结果表明:随着暴晒时间的延长,材料中α松弛内耗峰逐渐地移向了低温区,环境因素的交变作用会加速稻糠与聚乙烯界面处以及材料基体中的分子链断裂,从而使得α松弛处的内耗降低。材料的贮存模量随着频率的增大而有所增加,损耗因子在材料HDPE的熔点前随着频率的增大而降低,但在熔点后规律为50Hz<1Hz<25Hz<10Hz。更多还原

【Abstract】 For the examination of the durability of Wood-plastic composites under outdoor weathering, the dynamic mechanical change of the composite was studied and analysed by means of dynamic mechanical analysis (DMA) in this paper. The results showed that with the increase of the time of weathering, the α-peak of tan δ changed to low temperature region. The alternative effects of environment factors accelerated the fracture of the interface of rice hull and polyethylene and the fracture of the molecular chains, making the α-peak of tan δ decreased. The storage modulus increased and the tan δ decreased with high frequency before the melting point of HDPE, but the rule was 50 Hz<1 Hz<25 Hz<10 Hz after the melting point of HDPE.更多还原