Study On Ep Resin Modified Nano-Silica And Mechanical Properties Of Composites

Owing to their light, excellent mechanical properties and a series of other advantages, and obviously advantage of lightweight of polymer composite Liquid Oxygen (LOX) tank, composite materials have been critical and broadly studied in the development of the launch vehicles of next generation, especially in the propelling system. In this present research, prepared polymer matrix of composite was modified, and influence of composite materials interface and mechanical properties at room and low temperature was studied. We want to prepare composite with good properties and wish to the lay a good foundation of this area for the following researchers.Curing kinetics and mechanism of polymer matrix are exmined by means of TG-DSC and FTIR. Using the result of dynamic contact angle, micro-debonding and mechanical properties of composite materials and matrix, influence of modified with nano-silica resin to composite at room and low temperature, and low temperature to matrix, interface, mechanical properties of composite, are exmined.The results of curing kinetics show that curing process is reasonable. Apparent activation energy about 90.58 kJ/mol and apparent reaction order about 0.95 are calculated. The results show that resin system with 14wt% can meet requirements of composite slabs at room temperature and keeping 60min at 80oC before Curing reaction can make the interface between resin and fibers better. Impact strength of resin, shear strength of interface between resin and fibers, interlaminar shear strength of composite slabs can be improved after modifing with 1wt% nano-silica, especially at low temperature. Impact strength of resin is reduced at low temperature. Shear strength of interface between resin and fibers is increased. shear strength of interface between composite slabs is reduced. At room temperature, the bending strength of prepared composite slabs is about 1617.76MPa, modulus about 108.45GPa, interlaminar shear strength about 100.83MPa, while the bending strength of prepared composite slabs is about 1752.95MPa, modulus about 94.57GPa, interlaminar shear strength about 134.33MPa.