纤维增强树脂基复合材料吸湿特性试验方法

介绍了纤维增强树脂基复合材料吸湿特性研究常用的国内外标准试验方法,分析了国内研究人员常采用的相关试验方法在吸湿方式、吸湿试验参数设定等方面的不足。总结了吸湿率、扩散系数、吸湿活化能等吸湿特性参数的计算方法,指出了各参数在纤维增强树脂基复合材料湿热老化性能评价方面的作用和意义。     

树脂基玻璃纤维复合材料吸湿对性能影响及其机理研究

研究了树脂基玻璃纤维增强复合材料吸湿过程及其机理。通过对玻璃纤维复合材料吸湿后相关性能的测试,了解了复合材料的吸湿行为,以及吸湿行为对相关性能的影响。研究认为树脂基体及界面的吸湿行为对材料整体性能影响很大,宏观表现为力学性能、热性能等明显下降。研究结果表明纤维复合材料吸湿性不仅取决于树脂基体,与纤维及界面均有关系。     

光固化树脂基复合材料研究进展

介绍光固化反应的基本概念、光固化树脂基体的组成及光固化树脂基复合材料用增强材料的种类。阐述不饱和聚酯树脂、丙烯酸型树脂及混杂体系光固化材料的研究进展。指出对光固化树脂基复合材料用增强材料的基本要求。展望了光固化树脂基复合材料的发展前景。     

纤维增强树脂基夹芯复合材料隔声性能的研究

本文对轨道交通车辆安装复合材料头罩的驾驶室进行隔声研究,先从双层纤维增强树脂基夹芯复合材料对称结构和非对称结构的隔声性能进行研究,再对三层纤维增强树脂基夹芯复合材料结构的隔声性能进行探究,接着进一步探究阻尼材料、隔声材料对纤维增强树脂基夹芯复合材料隔声性能的影响,最后根据驾驶室的实际情况,探究空气层和内饰件产品对驾驶室隔声性能的影响。结果表明,对于双层纤维增强树脂基夹芯复合材料结构,在声源侧分配厚的纤维层,比平均分配两侧纤维层可获得更高的隔声性能;对于三层纤维增强树脂基夹芯复合材料结构,将厚度最大的纤维层置于近声源端,将厚度次之的纤维层置于远声端,将厚度最小的纤维层置于中间的结构,其隔声量明显优于双层纤维增强树脂基夹芯复合材料结构;在复合材料背面增加阻尼材料或隔声材料都可提高其隔声性能;考虑内饰件及空气层时,驾驶室的隔声量可提高。     

纤维增强树脂基复合材料的搅拌摩擦焊研究

利用搅拌摩擦焊实现了纤维增强树脂基复合材料的焊接,获得了焊接接头力学性能并分析了接头形成和断裂机制。结果表明,由于搅拌摩擦焊过程中搅拌针的摩擦剪切及对塑化材料的挤压作用,使树脂基体发生塑化并带动碳纤维迁移形成焊接接头,在搅拌头旋转速度950 r/min,焊接速度38 mm/min时,接头拉伸强度可以达到52.43 MPa,接近母材强度的51%,焊接接头的断裂机制主要为基体剪切断裂和纤维-基体界面脱粘。     

光固化树脂及其复合材料制备与力学性能研究

采用光固化技术制备了光固化树脂(EEPE)及其玻璃纤维增强(EEPE／GF)复合材料,研究了各种单体配比对EEPE力学性能的影响,经过比较确定了可用于制备复合材料的单体配比;比较了EEFE与EEPE／GF复合材料的力学性能。结果表明,采用光固化技术制备。EEFE基复合材料具有可行性;EEPE／GF复合材料的弯曲性能、横向剪切强度及冲击强度明显优于EEPE,而纵向剪切强度低于EEPE。在光固化过程中,由于EEFE／GF复合材料中增强纤维对光的反射、漫射甚至吸收,使试样厚度受到一定的限制。     

国内树脂基复材产量可达530万吨

<正>国内树脂基复材2015年产量预计达530万吨。据专家介绍,复合材料是由两种或两种以上不同物质以不同方式组合而成的,能够融合和发挥各种材料的优点,扩大材料的应用范围。树脂基复合材料就是其中的一大类。树脂基复合材料以有机聚合物为基体,添加相应的纤维增强体构成,也称纤维增强材料,是目前技术较为成熟、应用最为广泛的一类复合材料。根据纤维增强体的不同,树脂基复合材料可划分为玻璃纤维增强材料、碳纤维复合材料、芳纶纤维增强复合材料等。     

热固性树脂基体复合材料的应用及其工业进展

介绍了热固性树脂基体复合材料在航空航天、能源、电子、运动器材、高压管道及容器、建筑工程补强等领域的应用情况。综述了热固性树脂基体复合材料的研究进展及发展方向,其中包括:发动机壳体及喷管用树脂基体、光固化树脂基复合材料、纤维增强用的环氧树脂基体4大品种,环氧树脂基体的改性研究(氰酸酯树脂/线形酚醛树脂体系共改性环氧树脂,双马来亚胺树脂改性环氧树脂及热塑性工程塑料增韧)。     

纤维增强树脂基复合材料在直升机的应用现状

本文介绍了纤维增强树脂基复合材料相关特征和直升机常用纤维增强树脂基复合材料的种类特性.描述了直升机结构特点以及纤维增强树脂基复合材料在直升机上的具体应用部位和应用现状,并对实际应用部位的结构特点、选材情况和其在直升机上的作用用途等进行了论述,同时对直升机用复合材料未来的发展趋势进行了展望.研究表明,纤维增强树脂基复合材...     

非连续长纤维增强树脂基复合材料进展

本文综述了非连续长纤维增强树脂基复合材料的制备工艺;纤维长度对力学性能的影响;非连续长纤维的增强与增韧机理和控制纤维长度对加工设备与模具的要求。     

Mechanical properties of carbon fiber/vinylester composites exposed to marine environments

The effects of seawater exposure on the mechanical properties of unidirectional T700 carbon fiber/vinylester (510A) composites have been examined. Carbon fibers with two different types of sizings (F and G) were studied. Dynamic mechanical analysis testing of the neat resin and a carbon/vinylester composite revealed similar viscoelastic responses and glass transition temperatures indicating same type of cured resin for both cases. An analysis of moisture absorption dynamics of the composites revealed Fickian behavior. The composites absorbed more moisture than the resin. The moisture up‐take in the composites is dominated by the fiber/matrix region. A comprehensive mechanical test program involving tension, compression, and shear tests was conducted on the composites at dry and saturated conditions. Composites with F‐sized carbon fibers displayed overall higher strengths than those with G‐sized fibers at both dry and moisture‐saturated conditions. Moisture absorption was found to have a moderate influence on most composite strengths, except for the in‐plane and interlaminar shear strengths, where reductions in the range of 10–16% occurred. POLYM. COMPOS., 35:1559–1569, 2014. © 2013 Society of Plastics Engineers     

Dielectric studies of water absorption and desorption in epoxy resins: influence of cure process on behaviour

Little is known about the way in which the chemical structure of an epoxy resin influences its ability to absorb and desorb moisture. This issue is addressed in a study of dicyandiamide‐ and amine‐cured epoxy resins. The dicyandiamide‐cured material will have a significantly lower preponderance of pendant hydroxyl groups than the amine‐cured material and may exhibit different behaviour when exposed to moisture. The uptake and loss of moisture was monitored gravimetrically, using broad band dielectric, dynamic mechanical thermal analysis and thickness measurements performed as a function of time at various temperatures. A comparison of the uptake and loss profiles for the first and subsequent cycles indicated significant differences in behaviour attributed to the way in which water can plasticise the matrix. Stresses frozen into the matrix during the cure process are allowed to relax as a consequence of the water hydrating the matrix and create voids and also allow matrix densification. These processes occur during the first hydration cycle and are not reversible. Subsequent hydration and dehydration appear to be reversible after the first hydration cycle. Water in the polymer is distributed between free water which is to be found in microvoids and bound water which is attached to the polymer chain. The amine‐cured epoxy resin which contains pendant hydroxyl groups has a greater capacity for water absorption than the ether‐containing backbone of the dicyandiamide‐cured material. Copyright © 2008 Society of Chemical Industry     

Physical,Chemical and Mechanical Properties of Hibiscus sabdariffa Fiber/Polymer Composite

Tensile, compressive, flexural and wear resistance properties of Hibiscus sabdariffa fiber-reinforced phenolic (Resorcinol Formaldehyde) resin matrix-based composites were evaluated to assess the possibility of using these fibers as a new eco-friendly material in engineering applications. Polymer composite samples were fabricated by a compression-molding technique developed in our laboratory. The effect of fiber dimension on mechanical properties was evaluated. The interfacial bonding between Hibiscus sabdariffa fiber and the polymer matrix has been found to affect the mechanical properties of the resorcinol formaldehyde resin matrix. It has been observed that particle-reinforced polymer composites exhibit better mechanical properties as compared to short and long fiber-reinforced polymeric composites. These composites were further subjected to an evaluation of morphological, thermal, physical (swelling and moisture absorption) and chemical properties.     

5528氰酸酯树脂性能研究

对新型的5528改性氰酸酯树脂的介电性能、耐热性能、粘温特性和吸湿性能进行了研究,结果表明:5528氰酸酯树脂具有良好工艺性能,适合于湿法预浸和热熔预浸,介电性能优异,介电损耗正切值为0.005 26,远远低于纯氰酸酯固化物,而且对于频率的稳定性更好,适合宽频应用5。528氰酸酯树脂体系是适合高性能透波材料或高频印刷电路板应用的树脂基体。     

Chemical Resistance,Mechanical and Physical Properties of Biofibers-Based Polymer Composites

A study on physical and chemical properties along with mechanical characterization of Hibiscus Sabdariffa fiber-reinforced Phenol–Formaldehyde resin matrix based polymer composites have been reported. Effect of fiber dimension on mechanical properties was evaluated. The interfacial bonding between Hibiscus Sabdariffa fiber and polymer matrix has been found to affect the properties of polymer matrix. It has been observed that particle reinforced polymer composites exhibit better mechanical properties as compared to short and long fiber reinforced polymeric composites. These composites were further subjected to evaluation of morphological, thermal, physical (swelling and moisture absorption) and chemical properties.     

双马来酰亚树脂基体的湿热特性研究

本文以四官能环氧树脂基体作参比物、选择两种典型的双马来酰亚胺树脂基体（环氧改性双马基体、烯丙基双酚Ａ／双马共聚基体）作为对象，研究其吸湿特性以及吸湿对树脂基体性能的影响，结果表明，树脂基体的化学结构和交联密度对吸湿特性有较大的影响，吸湿量对树脂基体性能的影响也与基体材料的类型，交联密度有关，不能简单地用给定时间下的吸湿率来评定树脂基体的湿热性能优劣。     

玻璃纤维对PTFE/SiO2复合基板材料性能的影响

采用表面改性、物料混合、压延成型、高温真空热压烧结工艺,得到了不同含量玻璃纤维(GF)增强聚四氟乙烯(PTFE)/二氧化硅(SiO2)复合基板材料,考察分析了GF含量对复合材料微观形貌、密度、吸水率、拉伸性能、压缩性能以及微波介电性能的影响情况。结果表明,随着GF含量的增加,PTFE/SiO2复合材料的密度逐渐减小,吸水率和损耗因子逐渐增大,拉伸模量、压缩模量和相对介电常数呈现出先增大后减小的趋势。当PTFE/SiO2复合材料中加入2%的GF时,复合材料具有良好的综合性能,密度为2.085 g/cm3,吸水率为0.094%,拉伸模量为1351 MPa,压缩模量为1643 MPa,相对介电常数为2.93,损耗因子为1.04×10–3。