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Study on Heat Resistant Wave-transparent Composites Based on Cyanate Ester Resin

Author: SunZhouQiang
Tutor: LiangGuoZheng
School: Suzhou University
Course: Materials Science
Keywords: Cyanate ester Aluminum phosphate Composites Glass fiber Surface treatment
CLC: TB332
Type: Master's thesis
Year: 2009
Downloads: 259
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Abstract


Advanced wave-transparent composites are“structural-heat resistant-wave transparent”composites, which are the main components of“eyes”for spacecrafts. With the repaid developments of aviation and aerospace industries, the Mach number of spacecrafts is increasing, so the wave-transparent composites should have more and higher properties, they are outstanding thermal resistance, excellent dielectric property, good processing characteristics and mechanical properties.Property of the matrix is the key factor of determining the main properties （such as dielectric, thermal and moisture properties） of a composite, so high performance matrix should be employed for developing advanced wave-transparent composites.Based on outstanding integrate properties of both cyanate ester （CE） and phosphate aluminum （AlPO4）, a novel kind of composite （AlPO4/CE） was designed and prepared in this thesis by employing the“composite technology”, the effects of the interfacial nature and AlPO4 content on the properties of the new composite are discussed; in order to improve the toughness and moisture-resistance of AlPO4/CE composite, a ternary composite made up of epoxidized methyl phenyl silicone epoxy （E-Si）, AlPO4 and CE were developed, the influence of E-Si content on properties of AlPO4/CE are evaluated; a mixture of some kinds of aluminum phosphates with a pH value of 3-4 and good adhesion, s-AlPO4, was synthesized by grinding phosphoric acid, aluminum hydroxide and water, and glass fiber cloth reinforced composites （s-AlPO4/CE/EW-210） were prepared, then the mechanical and dielectric properties of s-AlPO4/CE/EW-210 composites were emphasized. By the investigations of this thesis, new theory and technology for developing new kinds of high performance resins and wave-transparent composites are set up preliminarily.Three kinds of coupling agents （KH-550, KH-560 and H-2） were used to surface treat AlPO4. The chemical nature of coupling agents on the properties of aluminum phosphate/CE composites were discussed, Results show that different coupling agents have different effects on the curing behavior and the interfacial adhesion of aluminum phosphate/CE composites. AlPO4（KH-550） and AlPO4（KH-560） have bigger effects than AlPO4（H-2）,so AlPO4（KH-550）/CE has the optimum properties among three composites. The properties of AlPO4（KH-550）/CE composites are closely related with AlPO4（KH-550） content. The thermal-decomposition of AlPO4（KH-550）/CE composites can be divided into 3 steps, while that of CE resin is 2 steps. With the increase of AlPO4（KH-550） content in composites,both the thermal conductivity and storage modulus increase, but dielectric loss （tanδ） and glass transition temperature （Tg） decrease,while water absorption almost does not change. AlPO4（KH-550）/CE composite with desirable AlPO4（KH-550） content has better properties than CE resin.Comparing to AlPO4/CE composite, E-Si/AlPO4/CE composites have effectively improved impact strength, for example, the impact strength of the ternary composite with 15wt% E-Si is improved about 50%. In addition, the ternary composite has higher initial decomposition temperature; its thermal decomposition still has 3 steps, but the first temperature of the maximum decomposition temperature shifts to low temperature, and the char yield （Yc） decreases. On the other hand, the dielectric constant and water absorption of E-Si/AlPO4/CE composites are lower than AlPO4/CE composites.Comparing to CE/EW-210 composites,S-AlPO4/CE/EW-210 composites show higher mechanical properties due to increased the interfacial effect by the addition of S-AlPO4. For example, the impact strength, flexible strength and modulus as well as interfacial shear strength of S-AlPO4/CE/EW-210 composite with 15% S-AlPO4 increase about 38%, 6%, 32% and 45%, respectively, while the thermal expansion coefficient of the latter is only about 50% of that of the former. In addition, the ternary composite has the lowest dielectric constantε（3.353）and highest tanδ（0.0133）. Although the addition of S-AlPO4 into CE/EW-210 changes the shapes of damping factor in dynamic mechanical analyses, which does not decline Tg values.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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