發(fā)布時(shí)間：2018-07-18 10:02

【摘要】：本文利用熔融共混的方法制備了玻璃纖維(GF)增強(qiáng)聚苯硫醚(PPS)復(fù)合材料,研究了聚苯硫醚樹(shù)脂種類(lèi)、增強(qiáng)纖維種類(lèi)、玻璃纖維用量、硅烷偶聯(lián)劑種類(lèi)、填料種類(lèi)和晶須用量對(duì)復(fù)合材料力學(xué)性能的影響;采用差示掃描量熱儀(DSC)考察了PPS/GF復(fù)合材料的非等溫結(jié)晶行為;并用毛細(xì)管流變儀對(duì)PPS/GF/晶須復(fù)合材料的流變行為進(jìn)行了表征。研究結(jié)果顯示,增強(qiáng)纖維選用玻璃纖維時(shí)增強(qiáng)效果較好,隨著玻璃纖維用量的增加,PPS/GF復(fù)合材料的彎曲強(qiáng)度、拉伸強(qiáng)度、懸臂梁缺口沖擊強(qiáng)度、懸臂梁無(wú)缺口沖擊強(qiáng)度、負(fù)荷變形溫度和起始分解溫度逐漸增大。硅烷偶聯(lián)劑KH560處理玻璃纖維對(duì)PPS/GF復(fù)合材料的改性效果明顯。當(dāng)玻璃纖維用量為40%時(shí),復(fù)合材料的拉伸強(qiáng)度為154MPa,彎曲強(qiáng)度達(dá)到了270MPa,懸臂梁缺口沖擊強(qiáng)度為8.6kJ/m2,懸臂梁無(wú)缺口沖擊強(qiáng)度為35 kJ/m2,負(fù)荷變形溫度為152℃。通過(guò)DSC對(duì)PPS/GF復(fù)合材料的結(jié)晶行為進(jìn)行分析發(fā)現(xiàn),隨著降溫速率的增加,PPS/GF復(fù)合材料的結(jié)晶峰逐漸向低溫方向偏移;半結(jié)晶時(shí)間(t1/2)逐漸減小,結(jié)晶速率加快;半峰寬逐漸增大,晶粒尺寸分布不均勻。Ozawa法和R-t法可以較好地分析PPS/GF復(fù)合材料的非等溫結(jié)晶動(dòng)力學(xué)。對(duì)比不同填料在PPS/GF=60/40體系中的增強(qiáng)效果,發(fā)現(xiàn)1#晶須的補(bǔ)強(qiáng)效果較好。隨著晶須用量的增加,PPS/GF/晶須復(fù)合材料的拉伸強(qiáng)度、彎曲強(qiáng)度和沖擊強(qiáng)度均呈現(xiàn)先增加后降低的趨勢(shì),負(fù)荷變形溫度呈現(xiàn)逐漸降低的趨勢(shì)。通過(guò)熱失重(TGA)分析可以看出,隨著晶須用量的增加,PPS/GF/晶須復(fù)合材料的分解溫度逐漸升高。通過(guò)DSC分析可以看出,當(dāng)晶須用量較少時(shí),結(jié)晶峰移向高溫方向,但晶須用量大于20phr時(shí),結(jié)晶峰略向低溫方向偏移。毛細(xì)管流變儀研究發(fā)現(xiàn),PPS/GF復(fù)合材料的粘度隨著剪切速率的增大而逐漸降低,呈現(xiàn)出明顯的“剪切變稀”行為。隨著玻璃纖維用量的增加,PPS/GF復(fù)合材料的粘度逐漸升高,非牛頓指數(shù)n逐漸降低。當(dāng)實(shí)驗(yàn)溫度和剪切速率相同,晶須用量為5phr時(shí),PPS/GF/晶須復(fù)合材料的粘度最低,復(fù)合材料的結(jié)構(gòu)粘度指數(shù)較高,材料的紡絲加工性能較好。隨著晶須用量的繼續(xù)增加,復(fù)合材料的粘度逐漸升高。隨著實(shí)驗(yàn)溫度的升高,PPS/GF/晶須復(fù)合材料的粘度逐漸降低。在310℃~315℃時(shí)復(fù)合材料的結(jié)構(gòu)粘度指數(shù)下降幅度最小,該溫度范圍下熔體流動(dòng)最穩(wěn)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，

本文編號(hào)：2131558