不同聚酰胺树脂的吸水特征及对苯乙烯单体扩散聚合行为的影响

Water Absorption Characteristics of Different Polyamide Resins and Their Effects on the Diffusion and Polymerization of St Monomer

研究了不同聚酰胺(PA)树脂的吸水特征及对苯乙烯(St)单体扩散聚合行为的影响.结果表明,在利用扩散聚合法制备PA/PS纳米合金的过程中,纳米合金中的聚苯乙烯(PS)含量随着PA颗粒内部含水率的增加而增加;在90℃扩散聚合条件下,PA6,PA66及聚己二酰间苯二甲胺(MXD6)体系相应的饱和PS含量分别为6. 7%,2. 5%和1. 6%; St单体对各PA颗粒的扩散聚合均发生在PA的非晶区,所生成的纳米PS小球尺度均在数十至100 nm左右,并呈均匀分布;由于刚性PS粒子对PA起到了较好的增强作用,可使各PA/PS纳米合金的拉伸强度和杨氏模量有明显提高.

The water absorption characteristics of different polyamide resins and their effects on the diffusion and polymerization of styrene(St)monomers were studied.The results show that PS content of PA/PS nanoalloy increases with the increase of water content of PA pellets.The maximum PS contents of PA6,PA66 and MXD6 are 6.7%,2.5%and 1.6%,respectively,under the conditions of difussion and polymerization at 90℃.Diffusion and subsequent polymerization of St occur in the amorphous regions of PA pellets,the PS nanoparticles ranging in size from 10 to 100 nm and distribute uniformly.Owing to the reinforcement effect of rigid PS particles to PA,the tensile strength and Young’s modulus of the PA/PS nanoalloy improved significantly.