考察了高密度聚乙烯(HDPE)基木塑复合材料(WPC)在经过挤出机7次循环挤出后性能的变化情况,并加入抗氧剂四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯(1010),研究了1010在循环加工过程中对材料性能的影响.实验结果表明,WPC的力学性能会随着加工次数增加明显下降,弯曲、拉伸和冲击强度分别下降约16％、20％和25％.WPC的结晶度则先降低后上升,储能模量和复数黏度都会不同程度地降低,热重分析则显示填充相木粉和基体HDPE都只发生了有限降解.而1010的加入使WPC的弯曲和拉伸强度略有降低,但会使冲击强度升高3％～7％,使WPC的结晶度提高1％～8％,使WPC的吸水率增大1.5％～7％.
The wood flour/polyethylene composites (WPEC) with and without an antioxidant (pentaerythritol ester) were reprocessed by extruding for seven times.The effects of recycle times on the properties of WPC were investigated.The results indicate that the mechanical properties decrease with increased reprocessing times.The bending strength,tensile strength and impact strength decrease about 16 ％,20 ％ and 25 ％,respectively.With the increasing of extruding times,the crystallinity of WPEC decreases first and then increases,the storage modulus and complex viscosity? reduce in different degree.TG analysis shows that both wood powder and HDPE only have limited degradation in this research.The antioxidant produces adverse effect to bending and tensile strength,but improves the impact strength by 3％ ～7％.After reprocessing seven times of WPEA,the degree of crystallinity increases by 1％ ～ 8 ％.Furthermore,the antioxidant results in the water absorption increased by 1.5 ％ ～ 7 ％.
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