芳纶Ⅲ单向复合材料制备及性能研究

用湿法缠绕法制备了芳纶Ⅲ-环氧树脂单向复合材料,对其拉伸性能、压缩性能、弯曲性能及层间剪切性能进行了研究,并对比了Kelvar-49、芳纶1414单向复合材料的相关性能。试验结果表明:含有杂环结构的芳纶Ⅲ不仅基本力学性能较优,其单向复合材料的拉伸性能、压缩性能、层间剪切性能都优于不含有杂环结构的Kelvar-49和芳纶1414,尤其体现在拉伸性能上。     

中温固化环氧树脂芳纶Ⅲ纤维复合材料性能研究

对芳纶Ⅲ纤维和及其织物(F-3S175)的性能进行测试,采用热熔法制备了3233中温固化环氧树脂F-3S175芳纶布预浸料,通过热压罐法成型复合材料层合板和蜂窝夹层板,进行性能测试,与Kevlar 49纤维进行对比。结果表明,芳纶Ⅲ纤维、织物和其3233树脂复合材料性能高于Kevlar 49芳纶纤维、织物及其复合材料性能。     

低温等离子体处理对芳纶/环氧界面性能的影响

在采用低温等离子体对芳纶纤维进行表面处理后，用扫描电镜观察处理前后的纤维表面，测试了纤维的拉伸性能，并用单纤维抽拔法对芳纶纤维／环氧树脂的界面性能做了定量的表征。实验结果表明：经低温等离子体处理后，芳纶纤维表面变得粗糙，拉伸强度随处理时间延长而下降，纤维初始模量和断裂伸长率略有下降，而芳纶／环氧界面的粘结强度有所提高。     

高能辐照对国产芳纶纤维/环氧复合材料界面性能影响

芳纶纤维因其表面惰性、光滑使其与树脂浸润性差,界面结合强度低。以环氧氯丙烷为介质1,采用60Coγ-射线辐照方法对国产芳纶纤维进行表面改性,以界面剪切强度（IFSS）和层间剪切强度（ILSS）表征芳纶/环氧复合材料界面结合性能。结果表明在400kGy辐照剂量下改性效果最好;经高能辐照处理的芳纶纤维表面能升高,并失去了原有的光滑表面,且纤维表面氧含量有大幅度提高,使得纤维表面活性增大。     

芳纶Ⅲ单向纤维增强复合材料测试方法研究

芳纶Ⅲ单向纤维增强复合材料由于其优良的力学性能,在航空航天、军事及个体防护装备等领域中应用广泛,因此采用合理的手段准确测试出芳纶Ⅲ单向纤维增强复合材料的力学性能变得十分重要.本文对芳纶Ⅲ单向纤维增强复合材料的拉伸性能、弯曲性能、压缩性能以及层间剪切性能进行测定,采用正交试验的方法,通过控制不同的测试条件(例如试验速度、...     

三维编织芳纶纤维增强尼龙复合材料性能研究术

研究了纤维体积比对三维编织芳纶纤维增强尼龙(简称K3D／PA)复合材料力学性能的影响。同时，研究了γ射线辐照处理对K3D／PA的影响。研究发现，随着芳纶纤维体积比的增大，K3D／PA的力学性能提高；芳纶纤维经γ射线辐照处理后，表面含氧量有所提高，并出现新的官能团。纤维经表面处理后，K3D／PA的弯曲强度、弯曲弹性模量及剪切强度均比未处理的高，但冲击强度较低。     

F-12芳纶纤维及其复合材料

本文评述了Ｆ－ １２ 芳纶纤维应用基础研究进展情况,着重介绍了纤维表面处理及其复合材料力学性能方面的研究成果,并就提高Ｆ－ １２ 纤维在复合材料中强度转化率问题提出了一些看法。     

短芳纶纤维增强聚苯硫醚复合材料的性能研究

本文研究了短劳纶纤维增强PPS／PEK－C复合材料树脂体系的力学性能。主要讨论了短芳纶纤维的长度、含量及若纶纤维的表面处理方法和压制温度对复合材料体系力学性能的影响。     

紫外老化对芳纶／环氧复合材料性能和结构的影响

通过紫外老化试验（温度（40±5）℃,湿度40％）,研究了芳纶、环氧及其复合材料的力学性能、玻璃化转变温度、失重随老化时间的变化,并用红外光谱分析了芳纶的结构变化。结果表明：经紫外老化后,芳纶／环氧的拉伸强度、失重率有明显的变化,芳纶结构和复合材料的玻璃化转变温度无明显的变化。     

芳纶纤维复合材料在天线工程中的应用

简要介绍芳纶纤维的性能和特点，以及芳纶纤维复合材料在雷达天线罩、双频选择反射器、轻型结构天线及特种电路基板等方面的国内外应用情况，指出了我国应着重研究与芳纶纤维复合的高介电性能的树脂体系，提高芳纶复合材料的层间强度，并扩展芳纶纤维与其它纤维的混杂应用。     

弹击对环氧树脂/芳纶复合材料结构性能的影响

采用层压工艺制备了环氧树脂/芳纶纤维复合材料板,对复合材料板用12.7 mm弹道枪1.1 g碎片模拟弹进行抗弹测试。在弹击的相邻区域取样,测试弹击点附近材料拉伸性能和弯曲性能的变化,研究弹击对复合材料结构性能的影响。结果表明,弹击对环氧树脂/芳纶纤维复合材料的拉伸和弯曲性能有不同程度的影响,相对于拉伸性能,弯曲性能的下降幅度更大。相对于离弹击区域最远的部位,材料离弹击区域最近的部位拉伸强度和拉伸弹性模量分别降低了14.6%和6.4%,弯曲强度和弯曲弹性模量分别降低了45.3%和57.3%。距离弹击点30~60 mm外的区域,材料结构性能基本不受影响。     

The Effect of Accelerated Weathering on the Mechanical Properties of Alkali Treated Hemp Fibre/Epoxy Composites

In this study, 65 wt% aligned untreated long hemp fibre/epoxy (AUL) and aligned alkali treated long hemp fibre/epoxy (AAL) composites cured at 70°C using compression moulding were subjected to accelerated weathering using an accelerated weathering chamber with UV-irradiation and water spray at 50°C for four different time periods (250, 500, 750 and 1000 h). After accelerated weathering, tensile strength (TS), flexural strength, Young's modulus (YM), flexural modulus and fracture toughness (K _Ic) were found to decrease and impact energy (IE) was found to increase for both AUL and AAL composites. AUL composite had greater overall reduction in mechanical properties than that for AAL composite upon exposure to accelerated weathering environment. FTIR, TGA and WAXRD analyses of the accelerated weathered composites support the results of the deterioration of mechanical properties upon exposure to accelerated weathering environment.     

The Effect of Fibre Surface Treatment on the Failure of Continuous Carbon Fibre/Epoxy Resin Composites

The failure mechanisms of a composite, consisting of continuous, aligned, high strength, polyacrylonitrile (PAN) based carbon fibre in an epoxy resin, under uniaxial tension, have been studied. In order to study the effect of the interphase/interface strength, six different levels of an electrochemical fibre surface treatment were used. Single tows containing approximately 12,000 treated carbon fibres were impregnated to produce composite rods with a fibre volume fraction of 0.55. Lengths of this impregnated tow were also set in the centre of glass-fibre/epoxy resin composite coupons which were used to study the mechanisms of failure of the embedded tows. Acoustic emission was used to monitor all samples and bundle failure was found to occur after a build-up of sub-critical damage events as previously modelled.¹ Microdebond tests demonstrated an initial increase of interfacial strength which levelled out at the higher levels. In impregnated samples with high surface treatments, catastrophic failure occurred with the crack propagating approximately perpendicular to the fibre direction. However, in samples with lower fibre surface treatments, longitudinal splitting (not accounted for in current models), occurred, meaning that a greater length of composite was involved in the final failure process. Acoustic emission has been shown to have an approximately direct relation with the predicted number of single fibre breaks in composite test-pieces; however, there was no significant difference attributable to the different surface treatments. The hybrid test coupons allow a detailed assessment of the failure mechanisms within the impregnated carbon tow. The failure strains of the embedded tow is some 5% higher than that of unsupported tow. The Weibull modulus is of the same order.     

The Effect of Fibre Surface Treatment on the Failure of Continuous Carbon Fibre/Epoxy Resin Composites

The failure mechanisms of a composite, consisting of continuous, aligned, high strength, polyacrylonitrile (PAN) based carbon fibre in an epoxy resin, under uniaxial tension, have been studied. In order to study the effect of the interphase/interface strength, six different levels of an electrochemical fibre surface treatment were used. Single tows containing approximately 12,000 treated carbon fibres were impregnated to produce composite rods with a fibre volume fraction of 0.55. Lengths of this impregnated tow were also set in the centre of glass-fibre/epoxy resin composite coupons which were used to study the mechanisms of failure of the embedded tows. Acoustic emission was used to monitor all samples and bundle failure was found to occur after a build-up of sub-critical damage events as previously modelled.¹ Microdebond tests demonstrated an initial increase of interfacial strength which levelled out at the higher levels. In impregnated samples with high surface treatments, catastrophic failure occurred with the crack propagating approximately perpendicular to the fibre direction. However, in samples with lower fibre surface treatments, longitudinal splitting (not accounted for in current models), occurred, meaning that a greater length of composite was involved in the final failure process. Acoustic emission has been shown to have an approximately direct relation with the predicted number of single fibre breaks in composite test-pieces; however, there was no significant difference attributable to the different surface treatments. The hybrid test coupons allow a detailed assessment of the failure mechanisms within the impregnated carbon tow. The failure strains of the embedded tow is some 5% higher than that of unsupported tow. The Weibull modulus is of the same order.     

芳纶复合材料的性能、制备及应用

芳纶具有高模量、高断裂强度、低热收缩率和低断裂伸长率等优异的性能,是理想的增强纤维材料。本文综述了芳纶材料的研究进展情况,芳纶复合材料的制备方法、性能及其在工业和生活领域的应用,并对其发展作了展望。     

环氧树脂/再生非金属粉末复合材料性能研究

将废旧印制线路板回收非金属粉与环氧树脂混合制备得到了不同非金属粉含量的环氧树脂复合材料。研究表明:随着非金属粉的加入,环氧树脂复合材料的弯曲强度得到了显著提高,降低了复合材料的热膨胀系数,同时环氧复合材料的绝缘性没有恶化。采用非金属回收粉填充环氧树脂复合材料是一种可行的废旧线路板回收利用方式。     

The Influence of Alkaline Surface Fibre Treatment on the Impact Properties of Sugar Palm Fibre-Reinforced Epoxy Composites

The aim of this study is to determine the impact properties of sugar palm fibre-reinforced epoxy polymer composite after introduce the alkaline treatment to the fibre. The fibre was treated by alkaline solution with 0.25 M and 0.5 M NaOH solution for 1 hour, 4 hours, and 8 hours soaking time. Hand lay up process was used to prepare the composite specimens with 10% volume fraction. The dimensions of the specimen used to carry out the test were adapted from ASTM D256 for Izod Impact testing. The higher impact strength of treated sugar palm fibre reinforced epoxy composite took place at 0.5 M NaOH solution with 8 hours soaking time, i.e., 60 J/m with improving by 12.85% from untreated composite.