PEN/PPS长丝的制备及共混比例对长丝性能的影响

将PEN(聚萘二甲酸乙二醇酯)和PPS(聚苯硫醚)切片共混熔融纺丝,得到耐温性好且可纺性强的共混长丝。为了探究共混比例对长丝性能的影响,将PEN/PPS以100/0、97/3、95/5三种比例(质量比)共混,并对长丝进行力学性能、耐化学性能、耐热性能、热缩率测试。结果表明:PPS的少量添加对PEN长丝的熔点影响不大,但PEN/PPS(95/5)共混长丝的结晶度远远小于其他两种比例的长丝;PEN/PPS(97/3)共混长丝同时具有高强力和高伸长率,且其在170℃热处理下强力变化率低,较为稳定;三种长丝在70℃下都具有较好的耐酸碱性,但PEN/PPS(97/3)共混长丝在90℃的温度下也能维持一定的酸碱稳定性;虽然三种长丝的热收缩率都较高,但PEN/PPS(97/3)共混长丝的收缩率最小。

The preparation of PEN/PPS filaments and effect of blending ratio on the performance

PEN/PPS blending filaments were prepared by melt spinning. The PEN/PPS was blended with three ratios (100/0, 97/3, 95/5) for studying the effect of blending ratio on filaments’ performance. The tensile strength, chemical resistance, heat resistance and thermal shrinkage of the filaments were tested and characterized. The results reveal that adding a small amount of PPS to PEN will not make a big difference on filaments’ melting point, but PEN/PPS (95/5) filaments’ degree of crystallinity is much smaller than the others with different ratios. PEN/PPS ( 97/3 ) filament has both high strength and elongation and it can sustain a relative stable strength under the heat treatment of 170 ℃. These three kinds of filaments all have good acid and alkali resistance at 70 ℃, but PEN/PPS ( 97/3 ) can still resist chemical attack even at the temperature of 90 ℃. Although these three filaments all present high shrinkage, PEN/PPS (97/3)’s shrinkage is the smallest.