| Epoxy resins(ER) possess many excellent properties and are widely utilized in many fields as a high performance thermosetting resin for many industrial applications. However, most thermosetting materials have many disadvantages, such as the great brittleness in the cured state and low heat-resistance. So it is difficult to fit for the requirements of the developing engineering technology and restricts its application in some special occasion. Therefore it is very important to enhance its heat resistance or composites' heat resistance.In this paper, various analysis techniques were used in studying the physicochemical characterization of modified epoxy resin. Some advanced composites, such as epoxy resin matrix modified with polyarylene ether nitrile (PEN), bismaleimide (BMI)/epoxy resin, modifying epoxy resin with aminopolysiloxane and ER/Gd2O3 hybrid materials were synthesized. The composition, structure, curing reaction, mechanics performance and other properties related to performance of modified resin matrix were studied.(1) The novel composites matrix was prepared by the polyarylene ether nitriles, epoxy resin and 4, 4'–diaminodiphenyl methane (DDM). The process of curing was studied by means of IR, differential scanning calorimetry analysis(DSC) and DMA. Using DSC technique, the curing kinetics of polyarylene ether nitriles modified epoxy resin system was performed based on Kissinger model and Crane method under dynamic curing conditions. Ideal curing temperature was simulated. Rheological Characteristics of the resin were tested by HAAKE. Thermal mechanics performance, dynamic mechanics performance and phase structure were studied by DSC, DMA and Scanning Electron Microscope (SEM). The aim of study is to make good theory foundation for the preparation of high-temperature resisted matrix material.(2) In this work, the adhesive with good physical properties can be taken by blending BMI and Epoxy resin under certain blending ratios and curing condition. The microscopy structure and the curing reaction of the adhesive were studied.It was confirmed by mechanical behavior and properties that the best mass proportion of ER/DDM/BMI was 5/2.5/10. The rheological characteristics, mechanism of the reaction and optimal curing technics of modifying epoxy resin with BMI were studied by HAAKE, IR and DSC. The toughness of modified resin was improved owing to addition of BMI. And the rubber power was added to modified resin for enhancing the toughness of cured epoxy.(3) Being disposed with DDM as cure agent, the adhesive composed of aminopolysiloxane/epoxy resin was produced under the best reaction conditions. The adhesive has good heat resistance and toughness. Additionally, properties of epoxy resin adhesive were evaluated by DSC, thermogravimetry (TG), figures of SEM, the lap shear strength and so on. The cure kinetics and the thermal decomposition kinetics of adhesive were studied. It is help to make good theory foundation for the preparation of high-temperature resisted matrix material.(4) In this paper, on the basis of the structure characteristic of rare earth, the structure, composition, curing process, mechanics performance and thermal stability of epoxy resin has been studied in detail. Thermal stability of epoxy resin was improved. And modified adhesive has good mechanics performance. Because of many special properties of rare earth elements, it can endue hybrid materials with new function. |
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