石英纤维的表面处理

石英纤维广泛运用于超高马赫数导弹天线罩材料中,本文研究了石英纤维表面浸润剂的去除方法,对不同手段处理后的石英纤维做了SEM、XPS分析,比较了处理前后石英纤维的拉伸强度的变化.结果表明,高温热处理能比较完全去除石英纤维的表面浸润剂,石英纤维的强度对热处理温度比较敏感.     

石英纤维复合材料强化处理工艺的研究

采用硅酮树脂对石英基体、石英纤维编织体和石英纤维复合材料进行强化处理,结果表明,由于强化处理后Si-O和-OH(或-NH)键的存在,提高了复合材料的弯曲强度.红外光谱分析和力学性能测试表明,合适的强化温度为450～550 ℃.     

热处理工艺对石英纤维复合材料介电性能的影响

通过热处理温度、热处理气氛和防潮涂层对石英纤维增强复合材料介电性能影响的研究,结果表明:在800℃或500℃通氧条件下进行热处理,才可以较彻底的排除石英纤维增强复合材料中残余的游离碳。经高温处理后介电性能较好,进行防潮处理后能达到更好的效果,更好的应用于航天领域。     

纤维表面冷等离子体处理对其表面性能的影响

本文采用冷等离子体技术来处理碳纤维、芳纶纤维与聚酯纤维，处理后纤维表面活性基团、浸润量与浸润速度增大，而接触角与浸润过程活化能降低，说明纤维浸润性是得到了很大的改善。     

氮化硼纤维热处理工艺对其性能影响的研究

以硼酸为原料．分别在氨气（NH3）和氮气（N2）气氛下进行氮化．制备氮化硼纤维。用中和滴定法、扫描电镜、XRD等对氮化硼纤维的氮含量、形貌、拉伸强度、弹性模量等进行分析。结果表明,氨气气氛下970℃保温1h和在氮气气氛下2000℃保温1h制得的氮化硼纤维的直径在4～6μm．氮含量为54．36％．拉伸强度为1400MPa．弹性摸量为120CPa。     

PBO纤维表面特性对酚醛复合材料拉伸性能的影响

复合材料良好的界面结合可使增强纤维发挥最大的承载作用,良好的纤维表面性能有助于纤维性能转化率的提高,从而有利于其力学性能。为研究国产聚对苯撑苯并二噁唑(PBO)纤维表面特性对酚醛基复合材料拉伸性能的影响,采用扫描电子显微镜、原子力显微镜和接触角测量仪分析了三种国产高模型PBO纤维的表面特性,并计算其纤维强度转化率。研究发现,PBO纤维的表面粗糙度和沟槽等对复合材料的界面性能及纤维强度转化率具有显著影响。结果表明：三种国产PBO纤维表面均有明显的黏附物和纤维向沟槽,表面杂质少、沟槽较多,表面粗糙度最大、表面自由能最高的PBO-A纤维强度转化率最高,PBO纤维的强度转化率(40%～50%)远低于碳纤维的强度转化率(70%～90%),其与树脂的工艺匹配性有待进一步提高。     

辐照APMOC纤维对其复合材料力学性能的影响

采用γ－射线辐照技术对ＡＰＭＯＣ纤维进行改处理。结果表明,Ｎ２为ＡＰＭＯＣ纤维辐照处理的最佳气氛,在一定辐照条件下,ＡＭＰＯＣ纤维产生了辐照交换反应,其束丝拉伸强度,层间剪切强度、横向拉伸强度均以不同程度提高。并用ＩＲ、ＤＳＣ、ＴＧ和ＳＥＭ对结果产生的原因进行了分析。     

磷酸盐基复合材料中石英纤维的表面处理

首先采用三种处理方法除去石英纤维表面的有机层,比较了处理前后石英纤维的失重、拉伸强度和浸润性变化,最终优选出30%硫酸洗涤的方法对石英纤维表面进行处理.然后通过溶胶-凝胶技术制备Al2O2涂层石英纤维,研究Al2O2涂层石英纤维的性能,并考察Al2O2,涂层石英纤维增强的磷酸盐基复合材料的机械性能.实验结果表明,Al2O2涂层提高了石英纤维的强度和热稳定性,其优化涂膜量为4.6%,最佳热处理条件为250℃/10min,Al2O2条层石英纤维增强磷酸盐基复合材料的常温机械性能优良,其高温处理后的机械稳定性优于未涂层纤维增强的复合材料.     

PBO纤维与石英纤维混编增强氰酸酯树脂基复合材料的研究

结合PBO纤维增强树脂基复合材料优异的介电性能和石英纤维增强树脂基复合材料优异的力学性能,本文设计了石英纤维与PBO纤维体积比55∶45混合编织,同时采用空气气氛对混编纤维表面进行等离子体处理,等离子体处理工艺为400W/10min,制备的氰酸酯树脂复合材料力学性能较纯PBO纤维增强氰酸酯树脂复合材料具有更加优异的性能,弯曲强度提高了62%,层间剪切强度提升了231%,大大加快了PBO纤维复合材料在透波复合材料领域的应用步伐。     

苎麻纤维表面改性对聚乳酸结晶及拉伸性能的影响

采用偏光显微镜（PLM）、差示扫描量热仪（DSC）、扫描电子显微镜（SEM）等探究了苎麻纤维（RF）表面处理参数对模压聚乳酸（PLA）/RF复合材料结晶行为和拉伸性能的影响。结果表明,碱处理参数影响RF诱导PLA的结晶行为,碱处理时间为3 h时RF促进PLA结晶,降低冷结晶温度（T_c）,提高相对结晶度,增加横晶致密程度;碱处理时间为6 h时,RF对PLA结晶有阻碍作用。Mo方法量化分析PLA非等温结晶动力学研究结果表明,植物纤维表面形貌的变化不改变PLA的结晶机制。拉伸性能测试结果表明,碱处理时间为6 h时增强和增韧效果最佳,PLA/RF复合材料的拉伸强度和断裂伸长率分别提高了19.6 %和23.9 %。     

石英光纤表面化学镀镍磷合金工艺

引　言石英光纤广泛应用于光通信、光传感等领域 ,利用它制作的光纤传感器可用来测量物体的应力和应变 .但在测量前应先将传感器牢固地固定在待测物体上 ,常用的固定方法是使用环氧树脂等胶黏剂 ,这种方法存在着致命的缺点 ,即胶黏剂与待测物体和光纤涂覆层之间、光纤芯层和光纤涂覆层之间会产生相对移动 ,使得测量的数据不能真实地反映待测物体的应力和应变[1,2 ] .因此 ,若能将石英光纤表面金属化 ,然后用锡焊的方法使光纤固定在　　Receiveddate:2 0　待测物体上 ,这一难题将会完全解决 .光纤表面金属化有多种方法可以实现 ,常用的方法…     

Effect of surface treatment on the tribological performance of carbon fiber reinforced thermoplastic polyimide composites

The effect of rare earth solution (RES) surface treatment of carbon fibers (CFs) on the tensile strength and tribological properties of CF‐reinforced polyimide (CF/PI) composite was investigated. Experimental results revealed that the tensile strength of RES‐treated CFs reinforced PI composite was improved by about 19% compared with that of untreated composite, while 7% improvement was achieved by air oxidation. Compared with the untreated and air‐oxidated CF/PI composite, the RES‐treated composite had the lowest friction coefficient and specific wear rate under given applied load and reciprocating sliding frequency. RES treatment effectively improved the interfacial adhesion between CFs and PI. The strong interfacial adhesion of the composite made CFs not easy to detach from the PI matrix and prevented the rubbing‐off of PI, and accordingly improved the friction and wear properties of the composite. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Effect of fiber chemical treatment of nonwoven coconut fiber/epoxy composites adhesion obtained by RTM process

In this work untreated and alkali treated nonwoven coconut fiber mats/epoxy resin composites were manufactured using the resin transfer molding process. The alkaline solution removes some impurities present on fibers superficial layers and the effect regarding fiber/matrix adhesion were investigated by thermogravimetric analysis, dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), ultrasonic C‐scan, and quasi‐static flexural test. Results show a removing of some amorphous fibers constituents, mainly waxes, extractives, and hemicellulose, revealing the fiber roughness surface but no initial degradation temperature changing. Regarding the composites, a similar interfacial adhesion was observed in both one through the results of SEM, DMA and quasi‐static flexural tests. The conclusion is that chemical treatment conditions applied on the fiber surface was been suitable to improve fiber roughness but did not the adhesion between coconut fibers mat and epoxy resin. POLYM. COMPOS., 38:2518–2527, 2017. © 2015 Society of Plastics Engineers     

Effects of silica surface treatment on the impregnation process of silica fiber/phenolics composites

Effects of silica surface treatment on the impregnation process of silica fiber/phenolics composites were studied. Micro‐Wilhelmy method was used to evaluate the surface characterization of silanized silica fibers. The interlaminar shear strength (ILSS) measurements and the void contents of the silica fiber/phenolics composites were also performed. The interactions occurring between silica fiber and the components of phenolic resin solution can affect the contact angle between silica fiber and phenolic solution and the dynamic adsorption behavior of phenolic resin onto silica fiber. There are competitive adsorptions to different extent for phenolic resin and solvent onto silica fibers. Silica fibers as reinforcement treated by silane‐coupling agent, such as γ‐aminopropyl‐triethoxysilane, γ‐glycidoxypropyl‐trimethoxysilane, trimethylchlorosilane, and γ‐methacryloxypropyl‐trimethoxysilane, influence the mechanical interfacial properties of silica fiber/phenolics composites and the uniformity of resin distribution. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

Impact of surface plasma treatment on the performance of PET fiber reinforcement in cementitious composites

The purpose of this study is to demonstrate the influence of plasma treatment on the surface properties of PET fibers used as micro reinforcement in cementitious composites. The stress transfer across cracks that untreated fibers are able to accomplish can be enhanced via plasma treatment. The increase in surface roughness and the activation of polar groups result in the reduction of surface energy as observed during wetting angle measurements. The improvement in adhesion between primary (non-recycled) fibers and the surrounding matrix brought about a more pronounced strain hardening of the specimens tested in four-point bending. Plasma treatment of thinner fibers from recycled PET led to a lower capacity for transferring tensile stresses due to the reduced cross-sectional area of the fibers. The considerable bridging force provided by the plasma treated primary PET fibers resulted in the prevention of excessive and abrupt cracking, and limited crack openings.     

Effect of MWCNTs irradiation grafting treatment on the surface properties of PBO fiber

The aim of this article is improved the surface properties of Poly[p‐phenylenebenzobisoxazole] (PBO) fiber with epichlorohydrin hybridized carboxylic multi walled carbon nanotubes (MWCNTs‐Ecp) grafting by using γ‐ray irradiation technology. The surface chemical properties, the surface morphology, the amount of the grafted MWCNTs on PBO fiber and the surface free energy of PBO fibers have been analyzed. The results show that MWCNTs‐Ecp have been grafted on the surface of PBO fiber by γ‐ray irradiation treatment. The surface chemical inertness and the surface smoothness of PBO fiber are significantly improved by grafting MWCNTs‐Ecp chains, the amount of the grafted MWCNTs on PBO fiber is about 11.9%, and the surface free energy of PBO fiber has an increase of 42.6% by generating some active groups such as ? COOH, ? OH, and ? C? Cl on the surface of PBO fiber. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Rotomolded polyethylene‐agave fiber composites: Effect of fiber surface treatment on the mechanical properties

In this work, a comparison between different agave fiber surface treatments has been presented to improve the mechanical properties of rotomolded natural fiber composites (NFC). The fiber treatments were carried out with sodium hydroxide, 2‐chlorobenzaldehyde, maleic anhydride grafted polyethylene, acrylic acid, methyl methacrylate, and triethoxy vinyl silane. In particular, a simple dry‐blending technique was used to introduce agave fibers in the polymer matrix (linear medium density polyethylene). The samples were produced at 15 wt% fiber content and characterized in terms of morphology, density, hardness, and mechanical properties (tension, flexural, and impact). The results showed that surface treatments improved the homogeneity (uniform morphology) of NFC and the best mechanical improvements (77% for strength and 30% for stiffness) were obtained with maleic anhydride grafted polyethylene. POLYM. ENG. SCI., 56:856–865, 2016. © 2016 Society of Plastics Engineers     

粉石英/重质碳酸钙复合填料表面改性工艺研究

本文研究了表面改性剂配方、用量、改性时间等对粉石英／重质碳酸钙复合填料表面改性效果的影响，试验得到最佳配方为复合填料：硅烷偶联剂：硬脂酸＝100：0．5：1，并对表面改性剂与粉石英／重质碳酸钙复合填料表面的作用机理进行了探讨。