| Hollow glass microspheres filled resin composites are widely used in aerospaceinsulation and deep-sea buoyancy material field for high quality characteristics and gooddesignability.The present work mainly focuses on adjusting the density of composites bychoosing high strength resin and beads to increase strength and adjusting the beads volumefraction, but little focuses on cenosphere and epoxy resin interface characteristics through therubber particle reinforced interface properties and reduced the porosity.The work studycarboxyl terminated butadiene acrilonitrile copolymer (CTBN) modified epoxy resin toachieve improved interface increased mechanical strength and reduce the porosity to improveoperational reliability have important significance.The work study E-51epoxy resin as matrix,594as curing agent, CTBN as modifier,hollow glass microspheres as filler, study the different fractions of CTBN modified epoxyresin prepolymer curing kinetics, established different CTBN content for curing kineticsinfluence rule, analyzed curing reaction mechanism and curing process end carboxyl nitrilerubber phase separation mechanism. Hollow glass microspheres modified by KH-550,preparation of different volume fraction of HGMs filled CTBN modified epoxy resincomposite, the density, porosity and mechanical properties were studied. Different HGMsvolume fraction, different CTBN content, coupling agent treatment on composite materialdensity, porosity and mechanical properties of regularity, observed after destruction of themicrostructure, reveals the failure mechanism.The results show that, maximum curing reaction rate and conversion rate decreasedgradually, with the increase of CTBN at different isothermal temperature.It is lower forreaction activation energy than reaction activation energy. The CTBN content from0%to20%, the activation energy of reaction from67.34kJ/mol to80.31kJ/mol increased by19.26%,at the final stage of the reaction activation energy from94.19kJ/mol increased to180.07kJ/mol increased by91.18%.The prepolymerization reaction of CTBN and E-51in the esterification reaction,594curing agent and E-51reaction mechanism mainly depends on the coordination complexinitiator epoxy cationic ring-opening polymerization, with cure reaction. CTBN in E-51/594curing system produced phase separation. With the increase of the volume fraction of HGMs, composite material porosity increased, compressive and bending performance decreased. withthe increase of CTBN content, composite porosity decreased first and then increased,compression and bending properties increased first and then decreased. Rubber phase arecaused by the change of mechanical properties and porosity of the important reasons. KH-550on HGMs surface treatment enhanced the bead and the interface between resin basedcomposite is improved, the compression and bending properties, compressive load.Compositematerials mainly follow direction45degrees and wedge failure failure mode along loaddirection. |
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