抗热氧化PPS复合材料的制备及性能研究

Preparation and Properties of PPS Composites with Anti Thermal Oxidation Resistance

针对聚苯硫醚(PPS)在高温工况下极易氧化的问题,在制备过程中,添加一种耐高温抗氧剂KYN–818,利用双螺杆挤出机制备抗热氧化PPS复合材料,采用傅立叶变换红外光谱仪、差示扫描量热仪和微机控制电子万能拉力试验机分别研究了PPS复合材料的结构、热性能、氧化诱导温度和力学性能。结果表明,在PPS复合材料谱线中,KYN–818与PPS之间没有形成新的官能团;当KYN–818质量分数为0.3%时,PPS复合材料的氧化诱导温度较纯PPS提高10℃;KYN–818起到增塑剂和异相成核剂的作用,使PPS复合材料的玻璃化转变温度降低5℃左右,降温结晶温度向高温方向移动;KYN–818的添加,没有削弱PPS复合材料的拉伸断裂强度,但使其断裂伸长率略有降低。

Aiming at poly（phenylene sulfide）（PPS） easily oxidized at high temperature condition, PPS composites with thermal oxidation resistance were prepared using the twin screw extruder, adding a high temperature antioxidant KYN-818 during the manufacturing process. The structure, thermal properties, oxidation induction temperature and the mechanical properties of the composits were studied using FTIR, DSC and computer-controlled electronic universal testing machine respectively. The results show that the new functional groups is not formed between KYN-818 and PPS in the spectral line of the composites. The mass fraction of antioxidant KYN-818 is 0.3%, the oxidation induction temperature of the composites than pure PPS raises 10 ~C. KYN- 818 plays the role of the plasticizer and heterogeneous nucleation agent, so that the glass transition temperature of the composites reduces about 5 ~C and cooling crystallization temperature moves to higher temperature. Adding of KYN-818, does not impair the tensile strength of the composites, just making the elongation at break decreased slightly.