Research On High Module Polymer Matrix And High Resistance To Compression Composites

Polymer composite has been used in structure. The structural composites endure compression and bending load. In practice, more and more desiral perfomance is put forward. In order to exert the high perfomance for composite, we must study and resolve the technology for the low compression and bending properties. The key technology is to enhance the modulus of matrix. The increase in the modulus of matrix can be realized by using antiplastics agents, if we found that there were connections between modulus and free volume. The new methods which can prepare the high modulus matrix with high density resin are reported domestically for the first time. A special epoxy resin called TDE-85 which has high density corresponding to some curing agents, such as MPD, A-SO, DDM, DDS, 2.4-MI, DICY can enhance the module of crosslinked epoxy matrix. Its Youngs module is up to 5.0 GPa. The compression module is more than 6.OGPa. The compression module of normal resin is about 4.2 1GPa. It can be used to composites with higher compression strength. By measuring the mechanical and thermal properties , the best ratio of epoxy/ amine, the technique processes as well as the kinetics of reaction are studied. The theoretical basis is to provide practical application of high module matrix. The connections of density, liner expanding coefficient and module are studied. The results indicated that module is controlled by chemical band, and the modules Tg increases , and liner expanding coefficient decreases with the density decrease. The influence of matrix module on the properties of composite is studied. As a result, the physical properties of tensile,compression, bending and cuting enhance with the increase of matrix module . The compress strength of glass fibre composite is 1337.5MIPa, which is closed to T300/epoxy composite. The bending strength is 2324.6MPa, which is bigger than that of T800/epoxy composite and other high performance composites. The breaking section of compression and cuting are observed. When composites with high module matrix endure compress loading, the fibres are broken off. When it endures cuting load, the matrix delamination is not distinctive.Nanometer SiO, TiQ and Q -Al2O3 are used to increase phySical properties ofBPA ePOxy resin. Suffoce treatment, ultrasonic and high sPeed dispersion machineare used to dispose the nanometer in resin matrix. As a result, three kinds ofnanometer materials show to increase the module and Ts of matrix. When thecontent of nanometer is small, the variations of Youngs module is accord withEinstein fOrmula. When the content of nanometer is large, the different linerexpanding coefficient betWeen nanometer and matrix can cause a inner stress,increasing air bubbles which exist in rewhted nanomCter, these two points candecrease module.Nano-fibre-comPOsite is Prepared with SiQ, S-GF and epoxy resin. Theperformance are increased with nanometer. Nanometer brings no influence onprepimion tecndcs. All of this is not rePOrted domestically.The data of free volume are tested by Positron technique. The connectionbetween module and free volume data is first tested by exPeriment. When the moleratio of TDE-85/arnine systems is the same, the far the distance of curing agent is,the smaller the heap density is, when the cast density decreases, the free volumedata increases, as a result, the cast module and Ts decrease. When TDE-85/A-50system reacts completely, the molecule heaP density is the biggest, the free volumebecomes the smallest,and the moduIe will be the biggest. When there is unratedmonomer, the free volume increases and the module decreases. For CYD-l28ePOxy resin, when the curing agen...