玻璃纤维纸增强聚四氟乙烯基复合材料的制备

玻璃纤维增强聚四氟乙烯(PTFE)复合材料是应用于高频/高速电子领域的一类关键基础材料。针对玻璃纤维布浸渍路线制备的复合材料上胶量不高的问题,以无碱玻璃棉纤维、短切石英玻璃纤维作为原料,采用湿法成型技术通过改变玻璃棉的打浆度制备了一系列结构均一、孔隙率高的玻璃纤维纸,并通过进一步浸渍PTFE乳液,采用冷压烧结的方式制备了一系列具有高树脂含量的PTFE基复合材料。系统研究了纸张孔隙结构对上胶量的影响,同时对不同上胶量的PTFE基复合材料的性能进行了进一步探究。结果表明,通过降低玻璃棉的打浆度可以有效提高纸张的孔径、透气度、孔隙率从而获得更高的上胶量以制备出介电性能更加优异的介质基板材料。随玻璃棉打浆度由21°SR增加至46°SR,玻璃纤维纸的透气度由382 mm/s降低至55 mm/s,平均孔径由8.21μm降低至2.20μm。当所用玻璃棉打浆度为21°SR时,抄造的玻璃纤维纸孔隙率为89.7%,上胶量高达89.17%。此时PTFE基复合材料具有最优异的介电特性,相对介电常数为2.246,介电损耗为1.26‰。     

玻璃纤维改性尼龙复合材料现状

玻璃纤维(GF)改性尼龙(PA)复合材料是一种高性能工程塑料,其应用范围十分广泛。对影响PA/GF复合材料性能的重要因素进行综述。阐述了GF与PA基体界面作用力、GF的直径、挤出机螺杆组合及GF与其他无机填料的协同作用对PA/GF复合材料性能的影响规律。结果表明,对GF进行有机化改性或在PA基体中添加其他改性剂能显著提升PA和GF界面作用力,从而提高PA/GF复合材料的力学性能。GF的直径越小,PA/GF复合材料的力学性能越好。螺杆组合对PA/GF复合材料中GF的长度和分散性具有重要影响,联合使用齿形盘、反向齿形盘与啮合块,制备的PA/GF复合材料性能更好。与单独采用GF改性的PA复合材料相比,当其他无机填料与GF协同使用时,PA/GF复合材料的力学性能较好。最后,对未来GF改性PA复合材料的研究方向进行了展望。     

高耐热低介电常数的聚酰胺复合材料的制备与分子动力学模拟研究

同时具有高模量和低介电常数的聚酰胺复合材料在电子电器领域具有重要的潜在应用。本文将玻璃纤维和空心玻璃微球引入到聚酰胺体系中制备聚合物复合材料,利用万能材料试验机和宽频介电谱阻抗分析仪等手段对复合材料的性能进行测试发现,玻璃纤维能改显著地改善聚酰胺复合材料的拉伸性能,空心玻璃微球能够有效地降低聚酰胺复合材料的介电性能。当玻璃纤维的含量为45%,空心玻璃微球的质量分数为10%,复合材料的性能最佳。分子动力学模拟结果表明分子链越长,聚酰胺的介电常数越小。这些实验结果和理论模拟为进一步提升聚酰胺复合材料的综合性能提供了参考。     

高性能UP/GF复合材料井盖的开发与应用

采用玻璃纤维(GF)和不饱和聚酯树脂(UP)为原料,研制了高性能复合材料井盖。介绍了该复合材料井盖的材料性能、结构设计及生产工艺。通过与铸铁、水泥、再生橡胶等不同材质井盖的性能对比,表明复合材料井盖具有承载能力高、抗震性能好、尺寸稳定、耐腐蚀、耐老化、使用寿命长、性价比高等诸多优点,并且生产工艺简单,可完全替代铸铁井盖,具有较高的推广应用价值。     

高性能玻璃纤维发展研究进展

本文综述了高强度玻璃纤维、低介电玻璃纤维和高硅氧玻璃纤维三种高性能玻璃纤维的特点、化学组成和相关产品信息;并对高性能玻璃纤维的应用做了总结与归纳。     

高性能玻璃纤维发展历程与方向

本文针对近年来不断发展的高强度、低介电、耐高温等高性能玻璃纤维,重点介绍了我国高性能玻璃纤维的发展历程,探讨高性能玻璃纤维发展方向。     

纤维增强PBT复合材料的性能研究

本文以玄武岩纤维(BF)、低介电玻璃纤维(DGF)和无碱玻璃纤维(EGF)为增强材料,采用双螺杆挤出,制备了增强PBT复合材料,研究了不同的纤维材料对PBT复合材料的机械性能、热性能和介电性能的影响。结果表明,BF、DGF、EGF均能有效提高PBT复合材料的机械性能和耐热性,但会增加材料的介电常数。DGF增强PBT复合材料的综合性能最优,介电常数和介电损耗角正切值最低;BF能明显提高PBT复合材料的耐热性,效果优于DGF和EGF,且不影响PBT材料的结晶性能。     

MMTⅡ与玻璃纤维对纳米复合材料的影响

高性能的玻璃纤维与性能优越的纳米基体材料结合才能制成满足各种工程和工业上的玻璃纤维增强的纳米复合材料产品的要求。因此要了解用来增强的玻璃纤维种类和性能以及玻璃纤维增强的纳米复合材料的物理特性,为玻璃纤维增强的纳米复合材料框架性研究输送详实的数据提供了保证。     

高性能SMC复合材料

与含20～30%玻璃纤维增强材料的普通聚酯片状模塑料(用于汽车仪表板)相比,这几年片状模塑料(SMC)结构复合材料的发展要快得多.在要求机械强度、耐温性能以及尺寸稳定性与金属材料相当甚至比金属材料更高的应用领域,具有高纤维含量以及高性能基体树脂的新一代SMC复合     

玻璃纤维增强APA6复合材料的研究及应用进展

玻璃纤维增强阴离子开环聚合尼龙6(APA6)复合材料因其优良性能被广泛应用于汽车、船舶、轨道交通、机械制造等领域,其主要包括短玻璃纤维增强APA6复合材料、连续玻璃纤维增强APA6复合材料和填料改性玻璃纤维增强APA6复合材料。本文综述了玻璃纤维增强APA6复合材料的研究及应用进展,主要介绍三类玻璃纤维增强APA6复合材料的成型工艺、力学性能和相关产业的应用情况。     

界面强度对玻璃纤维增强不饱和聚酯复合材料静态和动态力学性能影响

采用3种高强高模玻璃纤维与不饱和树脂,分别制备了3种单向板复合材料和3种织物复合材料,通过纤维束拔出法和韦布分析法表征了3种玻璃纤维与不饱和树脂间的界面结合强度,并研究了界面强度与复合材料静态和动态力学性能。结果表明:3种纤维的本征界面强度分别为27.12,34.91,35.60MPa;界面强度对复合材料静态力学与疲劳性能有着重要的影响,但对模量的影响较小。随着界面强度的增加,90°方向的拉伸强度逐渐增加,但是0°方向上的拉伸强度反而下降。当疲劳应变较低时,界面强度的增加有助于疲劳性能的提高;但当疲劳应变提高时,界面强度对疲劳性能的影响降低,与材料初始强度反而有着明显的相关性。     

浅析取样方法对玻璃纤维无捻粗纱成品可燃物含量测试结果的影响

介绍了玻璃纤维无捻粗纱成品可燃物含量检测取样常见的3种方法,使用统计技术对3种取样方式的检测结果进行了分析。通过使用移动极差分析数据的稳定性、概率图分析数据的偏倚性,确认3种取样方式的优劣,为玻璃纤维破坏性测量系统分析提供参考和思路。     

玻璃纤维增强PA6材料尺寸稳定性的影响因素

通过双螺杆挤出机熔融共混制备玻璃纤维增强聚酰胺6（PA6）材料,分析了环境湿度、成核剂、热处理对玻璃纤维增强PA6材料尺寸稳定性的影响。结果表明,吸湿膨胀和内应力释放收缩共同影响玻璃纤维增强PA6材料的尺寸变化,前者为主导因素;环境湿度越高、时间越长,玻璃纤维增强PA6材料的尺寸变化率越大,且在垂直流动方向上的尺寸变化率大于流动方向上的;环境湿度越低,达到相同吸水率需要的时间越长,吸湿溶胀作用越明显,玻璃纤维增强PA6材料的尺寸变化率越大;随着成核剂用量的增加,玻璃纤维增强PA6材料的尺寸变化率降低,用量为0.5份时最优,成核剂用量继续增加,玻璃纤维增强PA6材料尺寸变化率下降不大;热处理促进玻璃纤维增强PA6材料内应力释放收缩,与吸湿膨胀相反作用降低材料的尺寸变化率。     

白泡石在玻璃纤维生产中的应用研究

研究了白泡石在重庆地区的分布、贮量、品位,与叶蜡石、高岭土、石英粉在成分上对比。通过实验,确定白泡石在玻璃纤维生产中应用的可行性,经过加工后在玻璃纤维生产线实际使用,完全可以取代玻璃配方中含Al2O3和SiO2的叶蜡石、高岭土、石英粉,效果显著,成本明显降低。     

High‐temperature tensile behavior at different crosshead speeds during loading of glass fiber‐reinforced polymer composites

The present study evaluates on the static tensile behavior of glass fiber reinforced polymer (GFRP) composites at 50% and 70% volume fractions of reinforcement tested at room (25 °C), 70 °C, 90 °C, and 110 °C temperatures with 1, 10, 100, 500, and 1000 mm/min crosshead speeds to investigate the impact of high temperature on the mechanical properties and different dominating failures modes. The experimental results reveal that with increase in crosshead speeds the tensile strength of the composite is increasing. The effect of crosshead speeds and temperature with changing fiber volume fractions affects the GFRP composite. Although both the composite systems are found to be crosshead speed sensitive. Crosshead speed sensitivity seems to be more unpredictable at high temperature and at high crosshead speed. Furthermore, it appears to be more unprecedented nature of fluctuation with high fiber volume fraction. The crucial parameters required during the materials designing in various structural components were evaluated and modelled with the help of Weibull constitutive model. The fractography analyses were done to identify the various dominating failure modes in the GFRP composite. There was no significant change found in the glass transition temperatures (T_g) of both the composite system when exposed to different temperature environments. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44715.     

Study on mechanical properties of powder impregnated glass fiber reinforced poly(phenylene sulphide) by injection molding at various temperatures

The prepreg of continuous glass fiber reinforced poly(phenylene sulphide) (PPS) was prepared using the powder impregnation technique and cut into the pellets, in which the length of glass fibers was the same as the pellets. After injection molding, the mechanical properties were tested and the effects of the pellet length, fiber content, and thermal treatment on the mechanical properties at different temperatures were studied. It is found that the tensile strength and flexural strength of 6‐mm pellet sample are slightly higher than that of 3‐ and 12‐mm pellet samples. The tensile strength, flexural strength, and modulus decrease significantly with increasing the temperature. The notched Izod impact strength at 85ºC is higher than both at 25ºC and 205ºC. At 205ºC, the glass fiber reinforced PPS composites can still keep better mechanical properties. When the fiber content ranges from 0 to 50%, the mechanical properties increase with increasing the fiber contents at different temperatures, except the notched Izod impact strength do not further increase at 145 and 205ºC with raising the fiber content from 40 to 50%. Thermal treatment could improve the mechanical properties of the composites at higher serving temperature. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

2005-2006年国外不饱和聚酯树脂工业进展

综述了2005~2006年国外不饱和聚酯树脂的市场动态、工业发展趋势及技术进展。市场动态包括:原油价格及其对UPR的影响;UPR与不同成型方法的FRP的消费概况;面对全球经济发展战略,UPR树脂工业的兼并重组和发展;2005年中国UPR进出口量;2005年日本不饱和聚酯树脂的消费量;不饱和聚酯复合材料及其应用和销售;汽车用复合材料的不饱和聚酯树脂配方。技术进展包括:固化程度监测仪器;不饱和聚酯树脂的新型改性剂—环氧改性酚醛清漆;低轮廓添加剂;双重引发和促进体系。对生物复合材料工业进展进行了重点介绍。     

Thermal study of melting,transition and crystallization of rubidium and cesium borosilicate glasses

Thermal properties of the synthesized rubidium and cesium borosilicate glasses have been studied by differential scanning calorimetry. The values of glass transition temperature (T_g) and crystallization temperature (T_c) have been determined, the characteristic features of crystallization process have been established at various heat treatment conditions. Glass crystallization products have been characterized by powder X-ray diffraction. Information on the properties of the glasses makes it possible to correct the heat treatment parameters for glass-containing nuclear waste matrix materials.     

Optical Amplification at 1.3 μm in a Praseodymium-Doped Sulfide-Glass Fiber

Praseodymium-doped glasses were prepared in the Ga-Na-S (GNS) system and their optical properties were studied. A single-mode fiber with an attenuation loss of 1.2 dB/m at a wavelength of 1.31 μm was fabricated using an extrusion method, and the amplification characteristics were measured in the bidirectional pumping configuration. We demonstrated a gain coefficient of 0.81 dB/mW at a wavelength of 1.34 μm, which is the highest we have ever reported, and achieved a net gain of 32 dB for a pump power of 90 mW. Highly efficient optical amplification at a wavelength of 1.3 μm was demonstrated in the praseodymium-doped GNS fiber.     

Processing of gel-spun poly(β-hydroxybutyrate) fibers

Poly(β-hydroxybutyrate) (PHB) is a bacteria storage biodegradable polyester that is considered to be a natural substitute for synthetic thermoplastics in many applications. However, brittleness hampers its utility. This study shows that oriented elastic fibers of PHB with favorable mechanical properties (360-MPa tensile strength and 5.6-GPa Young's modulus) can be produced by the spinning and drawing of a concentrated PHB gel using a three-stage fiber processing technique. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2260–2264, 2001