由螺杆挤出机制备了尼龙6(PA6)和聚对苯二甲酸丙二醇酯(PTT)的共混物PA6/PTT.通过浸水实验,结合扫描电镜观察和热分析,研究了不同组分PA6/PTT共混物的吸水性能,并进行了相关力学性能测试.结果表明,PA6/PTT共混物吸水率随PTT含量增加而减小,即PTT的加入有效抑制了PA6的吸水率;在相同吸水条件下,PA6/PTT共混物的一般力学性能明显优于PA6,当PTT含量为20%时,共混物吸水后的拉伸、弯曲强度分别较PA6提高了20.98%和71.73%.
PA6/PTT blends were prepared by twin screw extruders after mixing poly(trimethylene terephthalate) (PTT) with polyamide 6 (PA6). The water absorptivity of the PA6/PTT blends was investigated by water immersion tests in combination with scanning electron microscope (SEM) and differential scanning calorimetry (DSC). General mechanical properties tests were also conducted in this paper. The results show that the amount of absorbed water in the blends decreases with the increase of PTT content, which indicates that the PTT phase can effectively restrain the PA6 phase from absorbing water. Mechanical tests also show that after absorbing water under the same conditions the general mechanical properties of PA6/PTT blends are obviously better than those of pure PA6. When the PTT content is 20%, the tensile and bending yield strength of PA6/PTT after absorbing water is improved by 20.89 % and 71.73 % respectively as compared to those of pure PA6.
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