【摘要】 利用差示扫描量热仪(DSC)研究了制备过程中不同熔融时间对聚苯硫醚(PPS)树脂的结晶度及结晶行为的影响;利用热失重分析仪(TGA)研究了不同熔融时间对PPS成型过程中热氧交联程度的影响。结果表明,在熔融时间为10~30 min范围内,PPS树脂的结晶度随熔融时间的增加逐渐减小,相对结晶度最大值为54.28%,最小值为48.66%;结晶峰向低温方向移动,峰宽增加、峰强减弱。这是由于PPS分子活性、分子链的热氧交联反应随熔融时间的不同具有不同的表现形式,进而影响PPS的结晶度与结晶行为;PPS树脂的热失重率随熔融时间的增加而减小,失重率最大值为51.88%,最小值为49.07%。这是由于PPS在空气中随着熔融时间的增加,链增长与交联反应程度加剧,使其难以在高温下发生热降解。更多还原

【Abstract】 The effects of different melting time on the crystallinity and crystallization behavior of polyphenylene sulfide( PPS) resin were investigated by differential scanning calorimetry( DSC). The effects of different melting time on the degree of thermal oxygen crosslinking on molding process of PPS were studied by thermogravimetric analysis( TGA). The results show that,in the condition of the melting time from 10 min to 30 min,the crystallinity of PPS resin decreases with the increase of melting time. The maximum value of relative crystallinity is 54. 28% and the minimum is 48. 66%. Crystallization peak moves toward the lower temperature,peak width increases and peak intensity decreases. This is because the different manifestations of molecular activity and thermal oxygen crosslinking reaction of PPS molecular chains with different melting time,thus affecting the crystallinity and crystallization behavior of PPS material. The thermal weight loss rate of PPS resin decreases with the increase of melting time. Maximum value of weight loss rate is 51. 88% and the minimum is 49. 07%. This is because with the PPS melting time increasing,the degree of the molecular chain growth and crosslinking reaction are enhanced, making PPS difficult to thermally degrade at high temperature.更多还原