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采用尼龙66 (PA66)和透明尼龙PA6T/6I为基体树脂,用熔融共混改性的技术方法制备PA66/PA6T/6I/GF复合材料,考察了透明尼龙PA6T/6I含量对复合材料的熔融结晶行为、热变形温度(HDT)、力学性能、表面性能的影响。结果表明,当玻璃纤维含量为30%的情况下,在透明尼龙树脂PA6T/6I用量不高于基体树脂含量的20%时,改性复合材料熔融结晶行为与PA66类似,复合材料制品表面的浮纤问题得到解决,比未添加透明尼龙PA6T/6I的复合材料相等的拉伸强度和弯曲强度分别提高27%和40%,简支梁和悬臂梁缺口冲击强度则分别提高了26%和40%,吸水率提高了30%,具有优异的综合性能和尺寸稳定性。 相似文献
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PA66/GF复合材料研制及应用 总被引:2,自引:1,他引:1
研究了不同单纤维直径的玻璃纤维(GF)增强尼龙(PA)66复合材料的力学性能,通过扫描电子显微镜研究了PA66/GF复合材料的微观形貌结构.结果表明,GF直径减小,其与PA66的界面结合程度变好,PA66/GF复合材料的力学性能逐渐提高,但增幅不尽相同,直径为11 μm的GF制得的PA66/GF复合材料的力学性能与GF直径为10 μm的力学性能相当、微观结构也相似.采用直径为11 μm的GF制得的PA66/GF复合材料具有更高的性价比,已广泛应用于汽车行业. 相似文献
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采用熔融共混改性技术制备了尼龙66/尼龙6/尼龙6I-6T/玻璃纤维(PA66/PA6/PA6I-6T/GF)复合材料,研究了PA6对复合材料表面状况、力学性能、热学性能等的影响。结果表明:当玻璃纤维含量60份,PA66/PA6用量比为21/5时,复合材料表面光滑,“浮纤”问题得到解决。与不含PA6的复合材料相比,当加入5份PA6时,复合材料的拉伸强度和弯曲强度从210 MPa和294 MPa下降至205 MPa和291 MPa,而弯曲模量和冲击强度从15.6 GPa和8.4 kJ/m2提高至17.2 GPa和9.9 kJ/m2。加入5份PA6时,复合材料的热变形温度从208℃下降至204℃,而熔融温度从251℃下降至225℃,熔体流动性提高至原来的2.3倍,对应的样品表面光滑。研究表明:在高玻纤含量(60份)时,加入5份PA6能够改善PA66/PA6I-6T/GF复合材料的“浮纤”现象,而且不会影响复合材料的使用性能。 相似文献
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采用双螺杆挤出机熔融共混法制备了碳纤维(CF)增强尼龙66复合材料(PA66/CF),对其结构进行了表征,并研究了其力学性能。扫描电镜照片显示,在PA66/CF复合材料中,CF与PA66基体充分粘结在一起,其微观形貌表明,体系中碳纤长度为0.5~0.7 mm。力学性能测试发现,与尼龙66相比,PA66/CF复合材料各项力学性能指标均有大幅度提高。当加入4束碳纤维时,PA66/CF复合材料力学性能最佳,该复合材料的拉伸强度为200.2 MPa,与PA66相比提高了113.2 MPa;弯曲强度为280.2 MPa,比PA66提高了190.3 MPa;弯曲模量为13560.8 MPa,比PA66提高了10628.7 MPa;冲击强度为14.8 kJ/m^2,比与PA66提高了6.3 kJ/m^2。该PA66/CF复合材料密度较小、力学性能优良,可以广泛应用于风电叶片、发动机罩盖、仪表盘、车尾门等产品当中。 相似文献
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采用玻璃纤维(GF)、反应性增韧母料(RTMB)与PA66热机械反应性共混制备出了PA66/RTMB/GF复合材料.用IR、SEM、力学性能测定等方法研究了PA66/RTMB/GF复合材料的化学结构、断面形态及力学性能.结果表明:PA66/RTMB/GF中RTMB、GF和PA66间形成了化学键连接,GF和PA66间呈柔性界面结合;PA66/RTMB/GF质量比为60/10/30的复合材料的拉伸屈服应力、弯曲弹性模量、悬臂梁缺口冲击强度分别提高到原料PA66的1.73倍、2.72倍、3.86倍. 相似文献
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以玻璃纤维(GF)增强,马来酸酐接枝氢化苯乙烯-丁二烯嵌段共聚物(SEBS-g-MAH)增容尼龙10T/尼龙66(PA10T/PA66)共混物,考察了两者用量对共混物力学性能、热变形温度、加工性能等的影响。结果表明,随着玻璃纤维添加量从5%增加到40%,复合材料的拉伸强度不断增加,缺口冲击强度先下降后增加,热变形温度大幅度增加,加工性能则变差,SEBS-g-M AH可以明显提高复合材料的缺口冲击强度。PA66与PA10T质量比为35/65,玻璃纤维添加量为40%,SEBS-g-M AH添加量为5%时,所得复合材料的拉伸强度为223. 4 MPa,缺口冲击强度为19. 65 k J/m~2,热变形温度为237. 9℃,熔体质量流动速率为12. 1 g/10min。冲击断面扫描电镜照片表明SEBS-g-MAH可以提高GF、PA10T和PA66之间的相容性。差示扫描量热研究表明PA66和SEBS-g-MAH会破坏PA10T结晶,GF添加量为5%时促进PA10T结晶,40%时稍微阻碍其结晶。 相似文献
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《工程塑料应用》2021,49(5)
以CO_2和缩水甘油醚为原料合成了环状碳酸酯,通过环状碳酸酯与偶联剂KH–550的氨基反应制备两种新型表面改性剂,与KH–550分别对玄武岩纤维(BF)进行改性,得到三种改性纤维KBF,KBF–P,KBF–B。采用双螺杆挤出机共混制备了改性玄武岩纤维增强尼龙66(PA66)复合材料,考察其力学性能和吸水率;采用扫描电子显微镜、热同步分析仪对复合材料的微观结构和热稳定性进行研究。结果表明,与未改性的复合材料相比,纤维质量分数为20%的PA66/KBF–B复合材料的拉伸强度、弯曲强度、无缺口冲击强度分别提高了5.5%,5.9%,25.5%;随着KBF–B含量的增加,PA66/KBF–B复合材料的力学性能均得到提高,当KBF–B质量分数达到40%时,PA66/KBF–B的拉伸强度、弯曲强度、无缺口冲击强度比纯PA66提高了161.1%,148.7%,112.7%,且优于相同纤维质量分数的PA66/玻璃纤维复合材料;PA66/KBF–B复合材料的饱和吸水率仅为3.8%且具有优良的热稳定性。KBF–B表面粗糙,与PA66具有良好的相容性。 相似文献
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聚乙烯和马来酸酐接枝聚乙烯对尼龙66性能的影响 总被引:1,自引:0,他引:1
采用熔融共混法制备了高密度聚乙烯/尼龙66(HDPE/PA66)和马来酸酐接枝聚乙烯/尼龙66(PE-g-MAH/PA66)复合材料,对其力学性能和熔体流动速率进行了测试,对共混物形貌进行了扫描电镜观察。研究表明,与不相容HDPE/PA66共混物比较,PE-g-MAH更能有效改善尼龙66的冲击韧性和加工性能,同时使保持PA66较高的拉伸强度。其原因是基于PE-g-MAH相的细微分散以及与PA66之间存在较强的界面粘附,有利于应力的有效传递。 相似文献
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Aggregation structure and thermal molecular motion of an adhered polymer layer on a glass-fiber (GF) surface after a removal of nylon 66 from a short glass-fiber reinforced nylon 66 were studied on the basis of photoacoustic spectroscopy-infrared spectroscopy (PAS-IR), pyrolysis-gas chromatography (Py-GC), X-ray photoelectron spectroscopy (XPS) and scanning viscoelasticity microscopy (SVM). PAS-IR, Py-GC and XPS measurements of the GF surface showed the presence of strongly adhered nylon 66 layer on the surface of aminosilane-treated GF. The glass transition temperature, Tg, of the adhered nylon 66 layer on the glass-fiber surface was directly evaluated on the basis of SVM measurement. In the case of the GF treated with an aminosilane coupling agent and a sizing agent, the magnitude of Tg at the (GF/nylon 66) interfacial layer was higher than that of the matrix nylon 66 due to the effective restriction of thermal molecular motion of nylon 66 at the (GF/nylon 66) interfacial layer. It is reasonable to consider that the sizing agent affects the strong interfacial interaction between a glass-fiber surface and matrix nylon 66 with covalent bond formation accompanying the network structure formation. 相似文献
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Malcolm B. Polk Leighton L. Leboeuf Munish Shah Chee-Youb Won Xiaodong Hu Wen Ding 《Polymer-Plastics Technology and Engineering》2013,52(3):459-470
The depolymerization of PET, nylon 66, and nylon 46 at high temperatures in an autoclave is well known in the patent literature. We sought to invent processes for the depolymerization of PET, nylon 66, and nylon 46 in alkaline solutions at low temperatures and atmospheric pressure. A method was developed for the depolymerization of polyethylene terephthalate (PET) which involved the use of quarternary ammonium salt phase-transfer catalysts in saponification processes at atmospheric pressure and temperatures as low as room temperature. Phenyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, trioctylmethylammonium chloride, and trioctylmethylammonium bromide were found to be effective catalysts for the depolymerization of PET in 5% aqueous sodium hydroxide solutions at temperatures as high as 80°C and atmospheric pressure to form terephthalic acid in yields as high as 93%. The catalyst could be recycled. The alkaline phase-transfer-catalysis approach was then successfully applied for the depolymerizations of nylon 66 and nylon 46. Benzyltrimethylammonium bromide was discovered to be an effective phase-transfer catalyst in 50 wt.% sodium hydroxide solution for the conversion of nylon 46 to oligomers. The collected nylon 46 oligomers were repolymerized using solid-state polymerization techniques to form high-molecular-weight nylon 46. Nylon 66 fibers were depolymerized in the presence of benzyltrimethylammonium bromide in 50% sodium hydroxide to form oligomers and a monomer. Adipic acid was isolated. 相似文献
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考察了网络度对锦纶66工业长丝物理性能及退绕性能的影响。结果表明,锦纶66工业长丝的线密度、定负荷伸长率指标随网络度的增加而升高,断裂强力、断裂伸长率和干热收缩率指标随网络度的增加而降低;当网络度保持在12~16个/m时,锦纶66工业长丝的退绕性能较好。 相似文献