先进树脂基复合材料RTM成型工艺研究及应用进展

复合材料的成型工艺是改进并提升先进树脂基复合材料性能的关键,而树脂传递模塑(RTM)成型工艺是一种环保高效、成本低、高精度的闭模成型工艺。概述并分析了传统RTM成型工艺过程及优缺点,并对高压树脂传递模塑成型(HPRTM)、轻质树脂传递模塑成型(LRTM)、真空辅助树脂灌注工艺(VARTM)、西门(Seeman)树脂浸渍技术(SCRIM P)等RTM衍生成型工艺的研究进展与应用进行了介绍分析。     

先进树脂基复合材料RTM工艺的研究进展

随着复合材料的应用越来越广泛,制件产品复杂性和质量要求越来越高,逐渐衍生出多种复合材料成型工艺.而树脂传递模型(RTM)及其派生工艺是一种高质量、高精度、高效率、低成本和绿色化的闭模成型工艺.本文简要介绍了RTM成型工艺原理、RTM衍生工艺成型过程及特点、RTM工艺应用现状以及RTM用树脂的研究现状,并提出了RTM工艺...     

电子束固化复合材料技术

简述了电子束（EB）固化复合材料的特点,介绍电子束固化机理,电子束固化树脂基体性能,复合材料试件及发动机壳体性能及电子束固化技术在航空航天复合材料其他领域的应用前景。     

辐射固化材料

辐射固化即辐线固化，包括紫外光固化(UV)和电子束固化(EB)两种，其内容有：感光树脂类为芳香族聚氨酯丙烯酸酯树脂、脂肪族聚氨酯内烯酸酯树脂、环氧丙烯酸酯树脂、端乙烯基树脂等。活性单体为二乙二醇二丙烯酸酯、三乙二醇二丙烯酸酯、三羟甲基丙烷三丙烯酸酯等。     

紫外光固化树脂及其复合材料研究进展

纤维增强树脂基复合材料(FRP)多采用热固化方式成型,成型周期长,无法满足汽车等领域复合材料结构快速、高效的生产要求。树脂紫外光固化技术具有固化速度快、生产效率高、环保节能等显著优势,可满足FRP大规模工业化生产要求。综合近年来紫外光固化树脂及复合材料领域的研究热点,主要从反应原理、固化动力学、树脂及配方研究、光固化复合材料成型工艺及应用等领域介绍目前的研究现状,对紫外光固化树脂及复合材料的未来发展进行简要展望。     

电子束固化木器清漆的制备及性能研究

电子束(EB)固化技术作为一种重要的辐射固化技术,其固化的清漆涂层性能在许多方面优于紫外(UV)光固化清漆涂层。本研究通过选取不同类型的商品化丙烯酸树脂及活性稀释剂配制木器涂料配方,分别利用电子束(EB)和紫外光(UV)对其进行固化,然后对固化后的涂层进行基本性能、热性能和机械性能的表征。研究结果表明:EB固化速度快,固化膜具有较高的铅笔硬度和附着力,而且树脂种类和单体结构的不同会对电子束固化涂层的热性能及机械性能产生影响。     

RTM成型技术及原材料的选用

<正> RTM,即树脂传递模塑工艺(RESINTRANSFER MOLDING)。其成型技术与RIW、冷模压、FRM 等成型技术一样,同属于复合材料的液体成型技术(LCM)或结构液体成型技术(SLCM)范畴。其基本原理是在设计好的模具中,预布放经合理设计、剪裁或预成型的增强材料,闭模后注入定量树脂,待树脂固化,脱模后即可得到所期望的产品,它是介于手糊法、喷射法和模压法之     

水性UV固化树脂的研究进展

介绍了近年来水性UV(紫外光)固化树脂的研究进展,重点综述了水性UV固化树脂的特点、分类及其在不同领域的应用研究。最后就水性UV固化树脂现存的问题展望了其未来的研究方向。     

树脂传递模塑（RTM）成型工艺及应用

本文概述了树脂传递模塑(RTM)的成型工艺过程及其应用前景。由此可了解 RTM 技术的全貌。通过对 RTM 与其它几种主要的复合材料加工工艺的比较,如SRIM(结构反应注射成型),SMC(片材成型)等,可以清楚地认识到 RTM 作为新一代复合材料加工工艺在航空、航天、航海、汽车和建筑等各个领域的发展潜力。     

高性能复合材料树脂传递膜技术(RTM)研究

树脂传递模塑法（RTM）是一种低成本、效益好的复合材料成型工艺。研究了RTM用树脂体系、预成型技术、成型模具、成型工艺以及RTM在航空航天领域的应用。     

微波技术在环氧树脂及其复合材料中的应用

论述了近年来微波固化技术在环氧树脂及其复合材料固化中的应用,重点比较了微波固化与传统热固化后环氧树脂及其复合材料的力学性能、热性能和粘结强度的变化,并对环氧树脂复合材料微波固化的研究进行了展望。     

用红外光谱法研究环氧树脂基体的固化特性

用红外光谱法研究了芳纶抗弹复合材料中改性Ｆ－４６环氧树脂基体的固化特性,用环氧基团相对浓度的变化速率表征环氧树脂基体的固化反应速率。研究了环氧树脂基体的固化反应速率随固化剂含量、固化反应温度的变化规律;根据固化反应过程中环氧树脂基体的环氧基、酯基和醚基等各活性基团相对浓度的变化情况,探讨了环氧树脂基体的固化反应机理。     

Study of physicochemical properties of two current commercial dental self‐curing resin composites

The aim of the present work is the study of some physicochemical properties of two current commercial dental self‐curing two component composites, i.e., of Concise? (3M?, Dental Products, St. Paul, USA), and Alfacomp (VOCO GmbH, Germany). Based on their filler type Concise is characterized as “conventional” or “macrofilled” composite and Alfacomp as “hybrid.” The resin matrix of Concise is a copolymer of 2‐bis[4‐2‐hydroxy‐3‐(methacryloxy)‐propyl]phenyl propane (Bis‐GMA)/triethyleneglycol dimethacrylate, while that of Alfacomp a homopolymer of Bis‐GMA. The composites were prepared in accordance with the manufacturers' instructions by mixing equal amounts of the two components at room temperature. The degree of conversion of double bonds of resin matrix during curing was determined in thin film of composites using FTIR transmission spectroscopy. The degree of conversion of Concise and Aflacomp was found to be correspondingly (73.63 ± 4.33)% and (47.75 ± 1.80)% after a day‐polymerization. Sorption, solubility, and volumetric change were determined after storage of composites in water or ethanol/water solution 75 vol % at 37°C (a good food/oral simulating fluid) for 30 days. These properties for both composites were higher in ethanol/water solution than in water. Also these properties for Concise were lower than those for Alfacomp in both liquids. Thermal stability of composites was studied by thermogravimetric analysis which performed in air atmosphere from 50 to 800°C. This analysis of composites showed the degradation of their resin matrix in three steps. The organic resin content of Concise was found to be 18.0% w/w and that of Alfacomp 20.1% w/w. Concise showed generally better properties than Alfacomp. This behavior must due to the differences in the chemical structure of the organic resin matrix and the type of inorganic filler. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Effects of compaction and UV exposure on performance of acrylate/glass‐fiber composites cured layer by layer

With an aim to reducing manufacturing costs, in general and specifically to provide a solution to the thick laminate curing depth issue for composite materials, UV curing technology was combined with a fiber placement process to fabricate acrylate/glass‐fiber composites. A novel layer‐by‐layer UV in situ curing method was employed in this article and interlaminar shear strength (ILSS) tests and SEM were used to evaluate the effect of processing parameters, including compaction force and UV exposure dose, on ILSS. The SEM images from short‐beam strength test samples and the results of ILSS showed that the fibers' distribution was uniform in the cured matrix resin resulting from the compaction forces and that beneficially influenced the ILSS of the composite greatly. However, the matrix resin produced large shrinkage stresses when it reached a high degree of conversion (DC) in one‐step, which resulted in poor interlaminar adhesion. In addition, the fast curing speed of UV on the composite resulted in poor wetting between fiber and resin, and accordingly resulted in lower ILSS. To overcome these problems and obtain high ILSS value composites, an optimized compaction force and UV exposure dose were determined experimentally. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

复合材料缠绕成型用电子束固化环氧树脂体系研究

为了研究适合于缠绕成型的低粘度可电子束固化复合材料的耐热环氧树脂基体,研究了不同组成的电子束固化树脂体系的粘度与温度的关系、耐热性与辐射剂量的关系及浇注体的力学性能。研究表明,树脂EB-4在60℃时粘度为389 mPa.s,树脂辐射固化的最佳剂量为150 kGy,而且在150 kGy辐射固化的EB-1、EB-4的玻璃化转变温度Tg分别为212.96℃、214.77℃,EB-4树脂浇注体的拉伸强度可以达到52.7 MPa,拉伸弹性模量2.79 GPa,断裂延伸率为2.18%,是1种适用于室温或低温下缠绕成型的耐热电子束固化环氧树脂基复合材料树脂体系。     

碳纤维增强树脂基复合材料的应用研究

碳纤维增强树脂基复合材料以其优异的综合性能成为当今世界材料学科研究的重点。本文介绍了的碳纤维增强复合材料的性能，简述了增强机理、成型工艺及其应用领域和发展趋势。     

Surface functionalities of multi-wall carbon nanotubes after UV/Ozone and TETA treatments

A carbon nanotube (CNT) surface was successfully modified using the UV/Ozone treatment and a triethylenetetramine (TETA) solution for use as the reinforcement for polymer matrix composites. These treatments along with ultra-sonication are aimed to disperse the CNTs uniformly in the resin matrix, as well as to provide the CNT surface with chemical functionalities for adhesion with epoxy resin. Fourier transform infra-red spectroscopy and X-ray photoelectron spectroscopy are performed to evaluate the changes in chemical structure and surface functional groups arising from the UV/O₃ and TETA treatments, confirming the efficiency of the processes. The practical implications of the surface functional groups for improving the interfacial adhesion in CNT-epoxy composites are discussed.     

Heavy crude oil asphaltenes as a nanofiller for epoxy resin

Asphaltenes are harmful components of heavy crude oils and require rational utilization after oil refining or deasphalting. Asphaltenes are macromolecules containing various functional groups that self-assemble to nanoscale aggregates and can be used as nanofillers for polymers. In this research, mixtures of asphaltenes with the diglycidyl ether of bisphenol A were considered. The solubility of asphaltenes in this epoxy resin, the rheological properties of the mixtures, and the effect of asphaltenes on the curing with 4,4′-diaminodiphenyl sulfone were studied. In addition, the glass transition temperature, strength, and adhesion characteristics of the asphaltene-filled cured composites were evaluated. The dual role of asphaltenes in polymer modification was demonstrated: the asphaltenes simultaneously plasticize and reinforce the polymer matrix, and the transition from predominant plasticization to strengthening occurs with an asphaltene content at 20 wt%. The dual reinforcement/plasticization effect occurs because epoxy composites contain both nanosized and microsized particles of asphaltenes due to the partial dissolution of asphaltenes in the epoxy resin and the decrease in their solubility during high-temperature curing.     

树脂基复合材料在雷达结构中的应用

本文介绍了树脂基复合材料的性能和成型工艺特点及其结构件的设计方法；阐述了树脂基复合材料在雷达结构中的应用；分析了目前树脂基复合材料在雷达结构中应用存在的问题，并给出了一些建议。     

KH—304树脂基复合材料固化工艺的研究

本文研究了ＫＨ－３０４树脂基复合材料的固化工艺，指出加压点必须选在树脂粘度最低之前。