短切玻纤增强聚苯硫醚复合材料的制备与性能研究
发布时间：2018-07-18 10:02
【摘要】：本文利用熔融共混的方法制备了玻璃纤维(GF)增强聚苯硫醚(PPS)复合材料,研究了聚苯硫醚树脂种类、增强纤维种类、玻璃纤维用量、硅烷偶联剂种类、填料种类和晶须用量对复合材料力学性能的影响;采用差示扫描量热仪(DSC)考察了PPS/GF复合材料的非等温结晶行为;并用毛细管流变仪对PPS/GF/晶须复合材料的流变行为进行了表征。研究结果显示,增强纤维选用玻璃纤维时增强效果较好,随着玻璃纤维用量的增加,PPS/GF复合材料的弯曲强度、拉伸强度、悬臂梁缺口冲击强度、悬臂梁无缺口冲击强度、负荷变形温度和起始分解温度逐渐增大。硅烷偶联剂KH560处理玻璃纤维对PPS/GF复合材料的改性效果明显。当玻璃纤维用量为40%时,复合材料的拉伸强度为154MPa,弯曲强度达到了270MPa,悬臂梁缺口冲击强度为8.6kJ/m2,悬臂梁无缺口冲击强度为35 kJ/m2,负荷变形温度为152℃。通过DSC对PPS/GF复合材料的结晶行为进行分析发现,随着降温速率的增加,PPS/GF复合材料的结晶峰逐渐向低温方向偏移;半结晶时间(t1/2)逐渐减小,结晶速率加快;半峰宽逐渐增大,晶粒尺寸分布不均匀。Ozawa法和R-t法可以较好地分析PPS/GF复合材料的非等温结晶动力学。对比不同填料在PPS/GF=60/40体系中的增强效果,发现1#晶须的补强效果较好。随着晶须用量的增加,PPS/GF/晶须复合材料的拉伸强度、弯曲强度和冲击强度均呈现先增加后降低的趋势,负荷变形温度呈现逐渐降低的趋势。通过热失重(TGA)分析可以看出,随着晶须用量的增加,PPS/GF/晶须复合材料的分解温度逐渐升高。通过DSC分析可以看出,当晶须用量较少时,结晶峰移向高温方向,但晶须用量大于20phr时,结晶峰略向低温方向偏移。毛细管流变仪研究发现,PPS/GF复合材料的粘度随着剪切速率的增大而逐渐降低,呈现出明显的“剪切变稀”行为。随着玻璃纤维用量的增加,PPS/GF复合材料的粘度逐渐升高,非牛顿指数n逐渐降低。当实验温度和剪切速率相同,晶须用量为5phr时,PPS/GF/晶须复合材料的粘度最低,复合材料的结构粘度指数较高,材料的纺丝加工性能较好。随着晶须用量的继续增加,复合材料的粘度逐渐升高。随着实验温度的升高,PPS/GF/晶须复合材料的粘度逐渐降低。在310℃~315℃时复合材料的结构粘度指数下降幅度最小,该温度范围下熔体流动最稳定。
[Abstract]:In this paper, glass fiber (GF) reinforced polyphenylene sulfide (PPS) composites were prepared by melt blending. The types of polyphenylene sulfide resins, types of reinforced fibers, amount of glass fibers, types of silane coupling agents were studied. The non-isothermal crystallization behavior of PPS / GF composites was investigated by differential scanning calorimetry (DSC) and the rheological behavior of PPS / GF / whisker composites was characterized by capillary rheometer. The results show that the reinforcement effect is better when glass fiber is used. With the increase of glass fiber content, the flexural strength, tensile strength, notched impact strength of cantilever beam and non-notch impact strength of cantilever beam are obtained. The load deformation temperature and the initial decomposition temperature gradually increase. The modification effect of glass fiber treated with silane coupling agent KH 560 on PPS / GF composites is obvious. When the glass fiber content is 40, the tensile strength of the composite is 154 MPA, the flexural strength is 270 MPA, the notched impact strength of cantilever beam is 8.6 kJ / m2, the notched impact strength of cantilever beam is 35kJ / m2, and the load deformation temperature is 152 鈩，
本文编号：2131558
[Abstract]:In this paper, glass fiber (GF) reinforced polyphenylene sulfide (PPS) composites were prepared by melt blending. The types of polyphenylene sulfide resins, types of reinforced fibers, amount of glass fibers, types of silane coupling agents were studied. The non-isothermal crystallization behavior of PPS / GF composites was investigated by differential scanning calorimetry (DSC) and the rheological behavior of PPS / GF / whisker composites was characterized by capillary rheometer. The results show that the reinforcement effect is better when glass fiber is used. With the increase of glass fiber content, the flexural strength, tensile strength, notched impact strength of cantilever beam and non-notch impact strength of cantilever beam are obtained. The load deformation temperature and the initial decomposition temperature gradually increase. The modification effect of glass fiber treated with silane coupling agent KH 560 on PPS / GF composites is obvious. When the glass fiber content is 40, the tensile strength of the composite is 154 MPA, the flexural strength is 270 MPA, the notched impact strength of cantilever beam is 8.6 kJ / m2, the notched impact strength of cantilever beam is 35kJ / m2, and the load deformation temperature is 152 鈩，
本文编号：2131558
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