碳纤维增强尼龙复合材料的摩擦学性能

根据碱催化阴离子聚合原理制备了连续碳纤维增强单体浇铸(MC)尼龙复合材料(CCF/MCPA).主要研究了CCF/MCPA复合材料的摩擦学性能和磨损机制.CCF/MCPA复合材料的摩擦系数随着载荷的增加呈现先升后降的态势,磨损率随着载荷的增加而增大.其磨损机制主要表现为粘着磨损和碳纤维的破碎和磨平的特征.     

尼龙纳米复合材料的研究进展

综述了近年来在尼龙纳米复合材料的制备方法、结构和性能等研究方面所取得的进展情况。重点说明了尼龙/无机物、尼龙/碳纳米管等尼龙纳米复合材料的结构和性能;指出今后尼龙纳米复合材料的应用前景和方向。     

接枝改性纳米氧化铝填充PTFE复合材料摩擦学性能研究

合成了含氟分子链接枝改性纳米氧化铝(Al2O3),用接枝改性纳米Al2O3填充聚四氟乙烯(PTFE),采用模压成型法制备了不同接枝改性纳米Al2O3含量的PTFE/纳米Al2O3复合材料;在摩擦磨损试验机上考察了接枝改性纳米Al2O3对PTFE/纳米Al2O3复合材料摩擦学性能的影响,利用扫描电子显微镜对复合材料的磨损表面进行了微观分析。结果表明,接枝改性纳米Al2O3填充PTFE复合材料在保持PTFE低摩擦系数的同时,提高了其耐磨损性能。     

尼龙66复合材料研究进展

综述了有关不同种材料对尼龙66共混后形成的复合材料及其性能的研究。主要分析了无机纳米粒子共混改性尼龙66、纤维共混改性尼龙66、多元复合材料改性尼龙66及其它材料共混改性尼龙66。研究经改性后的尼龙66复合材料性能变化,并对今后尼龙66复合材料的改性进行展望。     

尼龙的摩擦学改性研究进展

综述了近年来尼龙(PA)的各种摩擦学改性方法及改性PA材料的摩擦磨损形式与机制。从无机粒子填充改性、纤维增强改性、无机粒子/纤维共混改性、与树脂共混改性、表面改性等5个方面讨论了改性PA的摩擦学性能及机理的研究进展,并指出PA的摩擦学改性研究方向。     

尼龙6／高岭土纳米复合材料流变性能

采用XLY-Ⅱ型毛细管流变仪研究了尼龙6(PA6)和PA6/高岭土纳米复合材料的流变性能.结果表明,PA6和PA6/高岭土纳米复合材料均为假塑性流体.在210～240℃纳米复合材料的非牛顿指数为0.860～0.985,其表观黏度随着高岭土含量的增加先升高后下降.且在高剪切速率条件下,高岭土对纳米复合材料体系黏度的影响减小.高岭土的加入使PA6的黏流活化能降低,故在恒定剪切应力下其可在较宽的温度范围内成型加工.     

PTFE填充PI基复合材料摩擦学性能

以聚四氟乙烯(PTFE)为填料,聚酰亚胺(PI)为基体,通过机械冷压法制备了聚酰亚胺/聚四氟乙烯(PI/PTFE)自润滑复合材料。研究了PTFE在复合材料中质量分数对该材料和金属试件对磨时摩擦学性能的影响。结果表明:在一定质量范围内PTFE的加入对于提高复合材料耐磨性具有积极的促进作用。当PTFE质量分数为30%时,PI/PTFE复合材料磨损率最低。和纯PI相比,填充PTFE的复合材料耐磨性提高3个数量级。对试件磨损形貌的分析表明:在对偶面形成转移膜的连续性直接影响PI/PTFE复合材料的摩擦磨损行为。对应最佳摩擦学性能时形成的自润滑转移膜更加连续、光滑和完整。     

无机颗粒填充复合材料摩擦磨损性能研究进展

综述无机粒子填充聚合物复合材料的摩擦磨损性能，从磨损类形、机理、填料的摩擦学作用、摩擦副及工况条件(滑动速度、载荷、温度)的影响等几个方面分析了目前填充改性复合材料摩擦磨损性能的研究进展情况。试验证实，填料与聚合物、聚合物与摩擦副、填料与摩擦副均可能发生化学反应。     

填充型尼龙6导热绝缘复合材料的性能及制备

分别采用Al2O3、AlN、BN和SiC这4种填料填充尼龙6(PA6),利用双螺杆挤出机制备出PA6基导热绝缘复合材料。研究填料种类及含量对复合材料导热性能、电绝缘性能、力学性能及热变形温度的影响。结果表明:分别选用Al2O3、AlN、BN和SiC这4种填料制备的复合材料,填料含量相同时,导热性能无显著差异;填料含量较高时,AlN使复合材料的拉伸强度明显提高;BN能够显著提高复合材料的热变形温度。     

尼龙66基复合材料的研究进展

综述了近年来尼龙66(PA66)复合材料的研究状况和技术进展,重点讨论了PA66合金、PA66无机纳米复合材料和PA66填充增强改性,并对PA66复合材料的制备方法进行了介绍。同时对PA66复合材料的发展趋势及应用前景进行了分析和展望。     

Electric Conductivity and Thermorheology Properties of Polyacrylonitrile/Nylon6 Composites Filled with Carbon Black

The electric conductive polymer composites, which were made of carbon black particles through dispersing in mixtures of polyacrylonitrile (PAN)/nylon6 (PA6), were prepared in a Haake Thermo-mixer. The morphology, conductivity, thermorheology properties and their relationships were studied. Microphase separations and partial miscibility were confirmed when a small mass of PAN was introduced into PA6/CB composites. A part of CB particles could be attracted by PAN, and transferred to the interface of PA6 and PAN, leading to an increase of electric conductivity. Results also indicated that the introduction of PAN in the PA6/CB composite improved its elastic modulus as well as the thermal stability of its electric conductivity.     

硅灰石纤维改性PTFE材料摩擦性研究

采用硅灰石纤维(WF)、青铜粉、石墨填充改性聚四氟乙烯(PTFE),制备了PTFE摩擦材料。结果表明,与用作密封件的传统改性PTFE材料相比,采用WF、青铜粉与石墨复合改性的PTFE材料,具有较好的抗磨损性能,对对磨材料损伤较轻微,具有较好的硬度,能用作长期使用的密封材料。     

The Effect of Carbon Fiber Content on the Mechanical and Tribological Properties of Carbon Fiber-Reinforced PTFE Composites

Blending polytetrafluorothylene (PTFE) to carbon fiber at different compositions was produced in a corotating twin screw extruder where PTFE acts as the polymer matrix and carbon fiber as the dispersed phase. The effects of carbon fiber content on mechanical and tribological properties of the composites were investigated. The worn surface morphologies of neat PTFE and its composites were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. The presence of carbon fiber dispersed in the PTFE continuous phase exhibited superior tribological characteristics to unfilled PTFE. The optimum wear reduction was obtained when the content of carbon fiber is 30 vol%.     

玻璃纤维增强MC尼龙复合材料的力学性能

考察了玻璃纤维增强ＭＣ尼龙（ＧＦＲＭＣＮ）中玻璃纤维的表面处理及加入量对力学性能的影响。并用ＳＥＭ对ＧＦＲＭＣＮ材料界面及其对力学性能的影响进行了研究。结果表明：使用ＫＨ５５０作偶联剂对ＧＦＲＭＣＮ复合材料是很有效的;当玻纤加入４０％时,拉伸强度比基体提高３２２％,拉伸模量提高１５２％,弯曲强度提高７４３％,弯曲模量提高了１１７％。而缺口冲击强度提高了１６２％,根据材料的制备工艺特点,玻纤的加入量以３０％～４０％为宜,既保证有良好的综合力学性能,又具有很好的工艺操作性。     

碳纤维／PE—Ⅱ尼龙复合材料的力学性能

本文探讨了碳纤维表面处理的方法，ＣＦ含量对ＣＦ／ＰＥ－Ⅱ复合材料拉伸强度，冲击强度的影响，并研究了复合材料的摩擦磨损性能及尺寸稳定性。结果表明，ＣＦ／ＰＥ－２尼龙复合材料具有较高的强度和极优良的耐磨性及尺寸稳定性，是一种新型的高性能复合材料。     

The Effect of Arylboronic Acid Treatment of Carbon Fiber on the Mechanical and Tribological Properties of PA66 Composites

PA66 composites filled with surface-treated carbon fiber were prepared by twin-screw extruder in order to study the influence of carbon fiber surface arylboronic acid treatment on the mechanical and tribological behavior of the PA66 composites (CF/PA66). The mechanical property, friction and wear tests of the composites with untreated and treated carbon fiber were performed and the worn surface morphology was analyzed. The results show that the worn surface area of the treated carbon fiber was far smoother than that of the untreated carbon fiber and there formed a bonding adhesion on the carbon fiber surface after treatment. The tensile strength of CF/PA66 composites with surface arylboronic acid treatment was improved. The friction coefficient and wear of arylboronic acid treated CF/PA66 composites were apparently lower than that with untreated carbon fiber. In conclusion, the surface treatment favored the improvement of the higher interface strength and so had good effect on improving the tribological properties of the composites.     

聚甲亚胺改性MC尼龙复合材料干摩擦磨损特性

通过原位聚合法制备出由两种不同化学结构聚甲亚胺改性的MC尼龙复合材料,利用环-块形式对比研究了与45#钢环对磨时在不同磨损条件下的干摩擦磨损性能,并利用扫描电子显微镜对其磨损机理进行了分析。结果表明:在所测试的条件下,MC尼龙及其复合材料的摩擦系数随载荷的增加而逐步下降,聚甲亚胺在大多数条件下能够改善复合材料的耐磨损性能;在低速低载时,MC尼龙及其复合材料的磨损表面发生了明显的塑性形变,磨损机理为磨粒磨损和粘着磨损;高速高载时,磨损机理主要为粘着磨损和疲劳磨损。     

碱式硫酸镁晶须填充尼龙6复合材料研究

研究了碱式硫酸镁晶须用量和偶联剂对碱式硫酸镁晶须填充尼龙6复合材料力学性能、熔体流变性能和阻燃性能的影响。结果表明，经过硅烷偶联剂表面处理的晶须比钛酸酯偶联剂处理的晶须对尼龙6有更好的的改性效果；随着晶须用量的增加，复合材料的拉伸强度和缺口冲击强度都是先增加后降低，分别在晶须质量分数为40％和20％时达到最大值；复合材料的阻燃性能随晶须用量的增加而改善，碱式硫酸镁晶须的最佳用量为25％～40％。