等离子体处理改性玻璃纤维表面

本文研究了等离子体处理玻璃纤维表面的作用效果,分析了等离子体处理玻璃纤维表面所起的物理化学变化,探讨了玻璃纤维作为复合材料的增强材料在等离子体处理后,其润湿性提高的原因.     

玻纤/聚丙烯复合材料的界面改性研究进展

主要介绍了GF/PP复合材料的界面改性方法,玻璃纤维的表面处理和树脂基体改性。其中,玻璃纤维的表面处理包括偶联剂处理、浸润剂处理、等离子处理以及玻璃纤维的表面接枝。     

玻璃纤维粉煤灰增强尼龙复合材料的制备与性能研究

采用碱催化阴离子聚合反应制备玻璃纤维粉煤灰增强尼龙复合材料.研究了玻璃纤维表面偶联处理、粉煤灰的活化偶联处理以及两者加入时间和两者配比对复合材料力学性能和摩擦性的影响.结果表明:将经偶联处理的玻璃纤维、粉煤灰与催化剂一起加人己内酰胺单体,能够制备出性能良好的玻璃纤维粉煤灰增强尼龙复合材料;采用玻璃纤维和粉煤灰同时增强尼龙,两者表现出良好的增强效应;当玻璃纤维质量分数为30%、粉煤灰质量分数为10%时,所得的尼龙复合材料具有较好的力学性能.     

纳米SiO_2和PP-g-MAH对玻纤增强PP复合材料性能的影响

纤维和树脂之间的界面结合强度是决定复合材料性能的关键因素。通过实验研究在玻璃纤维表面涂覆经硅烷偶联剂KH550表面处理的纳米SiO_2以及在PP基体中加入PP-g-MAH对玻璃纤维增强聚丙烯复合材料的界面结合强度和力学性能的影响。结果表明,纳米SiO_2经KH550表面处理后可以降低其表面能,有利于其在纤维表面分散吸附;纤维表面涂覆纳米SiO_2及在PP中加入PP-g-MAH,有利于增强纤维和树脂之间的界面结合强度,复合材料的层间剪切强度提升了116.06%,拉伸强度提升了109.14%,弯曲强度提升了99.85%。     

玻璃纤维增强PA6的偶联剂种类优选

采用同一处理条件,分别应用KH550、KH560、KH570、KH792、DL602五种不同种类的偶联剂对玻璃纤维进行处理,与PA6共混制备了玻璃纤维增强尼龙6复合材料(PA6/GF)。考察了偶联剂种类对复合材料力学性能的影响。结果表明,硅烷偶联剂可以附着在玻璃纤维表面,偶联剂处理液种类对处理效果有影响。不同型号的硅烷偶联剂处理后的玻璃纤维制备的复合材料的性能不同,在考察的五种偶联剂中,经过KH550处理的复合材料弹性模量和断裂强度最大。硅烷处理液种类对复合材料的冲击强度影响不大。     

GFRP复合材料的疏水性研究及表征方法

概述了玻璃纤维增强不饱和树脂基复合材料（GFRP）疏水处理的必要性，研究了疏水处理的几种方法：添加氟化碳粒子、等离子体处理、在材料表面引入全氟烷基丙烯酸酯类物质，阐述了疏水处理的主要原理和复合材料疏水性能表征方法，简述复合材料疏水研究的发展趋势。     

玻璃纤维增强聚酰胺性能的研究

以通用聚酰胺为基体,利用短切玻璃纤维(事先用硅烷偶联剂进行表面处理)对其进行共混改性。研究了玻纤含量分布对复合材料力学性能的影响,扫描电镜分析了玻璃纤维增强聚酰胺复合材料的断面特征。当玻璃纤维用量约为30%时,材料的拉伸强度、拉伸模量和弯曲强度、弯曲模量最好,这时的拉伸强度、弹性模量、弯曲强度和弯曲模量分别增长了45.8%、100.1%5、7.1%和110.4%,冲击强度为5.3 kJ.cm-2。玻璃纤维改善复合材料的界面状况,有提高聚酰胺复合材料力学性能的作用,因为玻纤表面能够与聚酰胺之间形成紧密的结合。     

纤维临界表面张力测定技术

用ＷＤＳ－Ｉ型接触角测定仪可测定纤维材料的临界表面张力，用硅烷偶联剂处理玻璃纤维，测定偶联剂处理前后玻璃纤维临界表面张力的变化，可了解偶联剂对玻璃纤维表面浸润性能的影响。因此临界表面张力测定技术是复合材料界面研究的一种重要方法。     

短切玻璃纤维/丁腈橡胶复合材料的耐磨性能

先用硅烷偶联剂KH 550对短切玻璃纤维表面进行有机改性,然后通过机械共混法制备了短切玻璃纤维/丁腈橡胶复合材料,研究了短切玻璃纤维的用量和长度对复合材料耐磨性能及力学性能的影响,并用扫描电子显微镜观察了复合材料的磨损表面。结果表明,短切玻璃纤维在丁腈橡胶基质中的最佳添加质量为15份,长度以6 mm为宜,在此条件下所制备复合材料的耐磨性能及综合力学性能最好,磨损表面最为平整、光滑。     

纳米氮化硼协同玻璃纤维复合增强尼龙6

研究不同含量的纯玻璃纤维对尼龙6树脂力学性能的影响,然后通过多巴胺和纳米氮化硼对玻璃纤维表面依次进行改性,研究改性前后玻璃纤维复合材料的力学性能与导热性能。结果表明:加入30%纯玻璃纤维时,复合材料力学性能最好;在加入玻璃纤维含量相同时,表面经过纳米氮化硼改性后的纤维增强尼龙6复合材料力学性能和导热性能均有很大提高。     

研制高冲击强度的增强PA66材料

探讨了增韧剂、玻纤种类和螺杆组合对玻纤增强PA66冲击性能的影响。研究结果表明,加入增韧剂能够有效提高玻纤增强PA66的冲击性能,当增韧剂用量为3%时,材料具有最优的冲击强度和缺口冲击强度。特殊偶联剂处理的玻纤和合适的螺杆组合有助于玻纤在树脂基体中获得均匀分散和较窄的长度分布,并提高组分间的界面作用,得到冲击性能优异的玻纤增强PA66材料。     

等离子体射流载气流量大小对玻璃纤维改性效果影响的研究

通过大气压等离子体射流在玻璃纤维（GF）表面沉积氧化硅（SiO_x）纳米颗粒的方法改善玻璃纤维增强聚丙烯（GFRP）复合材料的界面结合性能,利用扫描电子显微镜、原子力显微镜和X射线光电子能谱等表征分析了改性纤维的表面形貌、化学成分、润湿性能和复合材料的界面结合性能,并考察了等离子体射流载气流量大小对GF改性效果的影响。结果表明,当载气流量为40 mL/min时,GF的改性效果最好,且此时GF的表面能相比对照组提高了43.18 %,GFRP复合材料的层间剪切强度提高了30.79 %;经过等离子体处理后,GF的表面粗糙度增大,极性官能团增多,复合材料的界面结合性能提升。     

The structure of γ‐glycidoxypropyltrimethoxysilane on glass fiber surfaces: Characterization by FTIR,SEM, and contact angle measurements

The purpose of this article is to determine the structure of γ‐glycidoxypropyltrimethoxysilane (γ‐GPS) on glass fiber surfaces. The interfacial adhesion of glass fiber–polymer can be improved by the silane treatment of the glass fiber. To change the composition of the glass and regenerate to the hydroxyl groups, activation pretreatment of heat cleaned woven glass fabric was performed using a 10% (v/v) hydrochloric acid aqueous solution for different durations before silane treatment. The treatment of silanization of heat cleaned and acid activated glass fibers with (γ‐GPS) were conducted at various time intervals. These fibers would be used to quantify the relationship between contact angle of glass fiber surface and the interfacial shear strength of the fiber–polymer interface. The effect of acid activation on glass surface and the interaction between glass fibers and silane coupling agent were examined using Fourier transform infrared spectroscopy. The experiments, in conjunction with electron photomicrographs of glass surfaces treated with coupling agent, are interpreted in an attempt to explain the stability of coupling agent‐glass interfaces. From SEM analysis, it was clearly observed that agglomerations of silane agent in the cavities among the heat cleaned fibers are available. However, this case was not observed for the silanization of acid activated glass fibers. In addition, contact angle measurements on glass fibers were performed to evaluate surface structure. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

淀粉纳米晶对玻璃纤维的表面改性研究

采用自制的淀粉纳米晶(SNC)对玻璃纤维进行表面处理,增加其与环氧树脂基体的界面剪切强度(IFSS)。研究了处理方式、处理时间、SNC乙醇分散液浓度、热处理温度等工艺参数对SNC在玻璃纤维表面沉积情况的影响,以及对改性玻璃纤维与环氧树脂的界面性能的影响规律。采用扫描电子显微镜、单纤维强力仪对处理前后玻璃纤维进行表征,并采用微脱粘法测试玻璃纤维与环氧树脂的界面粘结情况。结果表明,当重力静置处理时间24 h,SNC乙醇分散液浓度为1 g/100 m L时,SNC在玻璃纤维表面均匀沉积,且能显著提高玻璃纤维与环氧树脂的IFSS,为27.29 MPa,较未处理的纤维增加29.3%。150℃热处理4 h后,X射线光电子能谱结果显示SNC与玻璃纤维形成化学键合,进一步增加纤维与环氧树脂的界面粘结,IFSS值达到32.30 MPa,较未处理的纤维增加53%,且纤维的拉伸强度得到较好的维持。     

长玻纤增强聚丙烯复合材料研究进展

文章综述了长玻纤增强聚丙烯复合材料的研究进展,包括玻纤含量、长度,玻纤表面处理,功能化聚丙烯的添加,注塑工艺等对复合材料性能的影响,并对该复合材料今后的研究进行了展望。     

Surface Crystallization and Water Diffusion of Silica Glass Fibers: Causes of Mechanical Strength Degradation

Pristine silica glass fiber is well‐known to become mechanically weaker when heat‐treated in air but the cause of such weakening is not presently known. The time dependence of mechanical degradation of various silica glass fibers containing varying impurity contents were studied in the range from 500°C to 1000°C. Two possible sources of strength degradation were considered: surface crystallization and water diffusion. Surface crystallization kinetics of silica glass fibers were investigated in a wide temperature range, including nanoscale surface nucleation at low temperatures via scanning electron microscopy. From the comparison of the strength degradation, surface crystallization, and water diffusion data in literature, it was concluded that surface crystallization may be responsible for the mechanical weakening observed in silica glass fiber surface during heat‐treatment at temperatures above ~800°C, whereas water diffusion into the glass surface may be responsible for the strength degradation at lower temperatures.     

Effects of chemical surface pretreatment on tensile properties of a single glass fiber and the glass fiber reinforced epoxy composite

The aim of this article is to determine the effect of surface pretreatments, prior to the silanization, on the structure and tensile properties of the glass fibers and their epoxy composites. Commercial glass fibers were washed with acetone to remove the soluble portion of sizing, calcinated for the removal of organic matter, activated for surface silanol regeneration, and silanizated with glycidoxypropyltrimethoxysilane (GPS). Tensile test was carried out. The morphology of pretreated glass fibers and the fracture surfaces of the epoxy composites were observed with a scanning electron microscope (SEM). The results revealed that both apparent modulus and strength of a single glass fiber and the glass fiber/epoxy resin composites strongly depend on the fiber surface pretreatments. The acetone treatment did not change appreciably the composition and tensile properties of glass fibers, but there was a weak interface between fibers and matrix. In calcinated and acid activated fibers, the two competitive effects was observed: (1) degradation of the fibers themselves and (2) improved interfacial adhesion between the glass fibers and the epoxy matrix, once the samples was silanizated. The ATR‐FTIR results show that the surface content of Si OH increases as reflected by the increasing of the Si O band, resulting in an interaction between silane coupling agent and glass fiber. POLYM. COMPOS., 91–100, 2016. © 2014 Society of Plastics Engineers     

节能建材用高性能玻纤增强尼龙66隔热材料

文章研究了玻纤表面处理及其长度分布对高性能隔热条专用的增强尼龙66复合材料性能的影响。结果表明:玻纤表面处理剂MKH添加量达到0.11%时,能够有效地提高玻纤与尼龙66基体的界面粘接强度,并能提高隔热条饱和吸水后的拉伸强度;玻纤长度的平均值为0.75 mm,且长度分布均匀时有利于隔热条的挤出。     

浅谈玻璃纤维表面处理用热源及加热方式

对玻璃纤维进行表面处理是提高玻璃纤维性能,拓展应用领域的一种重要技术途径。论及的玻璃纤维表面处理指玻璃纤维热处理和表面化学处理,二者均需耗费能源。热源和加热方式的选择不但影响玻璃纤维表面处理产品性能质量,而且直接影响到生产成本。