阴离子聚合PA6/木粉复合材料的制备及性能

Preparation and Properties of Anionic Polymerized PA6/Wood Flour Composite

利用二苯甲烷二异氰酸酯(MDI)、硅烷偶联剂(KH550)2种试剂对木粉表面接枝改性,在碱性催化剂条件下,将改性后的木粉与己内酰胺单体混合,使其发生阴离子聚合反应,制备聚酰胺6(PA6)/木粉复合材料,对其进行测试及表征,研究PA6/木粉复合材料的微观结构、力学性能和摩擦特征。研究结果表明,木粉表面成功接枝了MDI和KH550,使木粉与PA6两相之间的界面粘结强度增大,同时增大了复合材料的冲击强度和拉伸强度,当木粉含量为1.5%时,复合材料的冲击强度达到掺杂木粉后的最大值。摩擦磨损性能实验中,随着木粉含量的增加,摩擦因数从0.18增大至0.24,这表明,增加木粉的含量能在一定程度上改善复合材料的摩擦学性能,并且其力学特性和热稳定性是影响摩擦磨损性能的主要因素。

The surface of wood powder was grafted and modified by two reagents:diphenylmethane diisocyanate(MDI)and silane coupling agent(KH550).Under the condition of alkaline catalyst,the modified wood powder was mixed with caprolactam monomer to make it undergoes anionic polymerization to prepare polyamide 6(PA6)/wood flour composite material,its performance was tested and characterized,and studied the mechanical microstructure,mechanical properties and tribological characteristics of PA6/wood powder composite.The research results showd that MDI and KH550 was successfully grafted on the surface of wood flour,which increases the bond strength between wood flour and PA6,and also increases the impact and tensile strength of the composite.When the wood flour content was 1.5%,the impact strength of the composite material reaches the maximum value after doping with wood flour.In the friction and wear performance experiment,with the increase of wood powder content,the friction coefficient increased from 0.18 to 0.24,which means that increasing the proportion of wood powder could improve the tribological properties of the composite to a certain extent.The mechanical properties and thermal stability affect the friction the main factor of wear.