Block Polymer Toughening Epoxy Resin Composite Material Preparation And Performance Research

In modern production and life, the use of advanced machinery and equipment has been spread around and the use of these high-tech makes our society had great progress, but the noise pollution, and subsequent mechanical equipment vibration generated by the potential safety problems become a big problem. Under the research of scientific researchers found that the use of damping material can well solve the problem. Damping materials is a kind of mechanical vibration can be converted into thermal energy functional materials, has been widely used in transportation, industrial machinery, civil building, household appliances, precision instruments and military equipment in areas such as damping noise reduction. The polymer damping materials with its damping performance is good, light weight, high strength, good toughness, easy to processing molding and low cost advantage is becoming a hot spot of damping materials research.For the insufficient of low mechanical properties and narrow damping temperature of general polymer damping materirals, In this paper, a five-block copolymer PS-PGMA-PDMS-PGMA-PS was first synthesized by ATRP, and the performance were studied. Then selected the better synthetic resin PS-PGMA-PDMS-PGMA-PS in good compatibility with epoxy resin, to cure the formation of macromolecular polymer with epoxy resin and curing agent phenylenediamine, blended carbon fiber, finally getted the high modulus damping composites. We carried out a detailed study on the morphology, damping properties, mechanical properties and thermal properties of composite materials.We synthesized multi-block copolymer PS-PGMA-PDMS-PGMA-PS. by atom transfer radical polymerization. Its molecular weight was controlled, and polymer polydispersity was low(PDI = 1.19 to 1.40); Nanostructures of micro-phase separation was formed on the microscopic phase, particle size was 200 nm, rubber and plastic form was formed on the macro phase; It has a good thermal stability, low decomposition temperature of 270 ° C, high decomposition temperature of 440 ℃.The macro-compatible between the synthetic resin, epoxy resin and carbon fiber is good. In particular, by adding carbon fiber powder, the synergy of three components in the system, the material exhibits good damping properties, the temperature range of tanδ > 0.3 is about 50 ° C(70 ° C and-120 ° C), and the maximum is 1.2. We can control the damping peak positions and peak to obtain the materials of damping properties under different temperature range, by joining the different reinforcing agents and their dosage.By adding synthetic resin composite materials is reduced the crosslinking density of the system, and its strength is not very high, to caused the compression modulus of system reduced. Compression modulus increased by adding high-strength carbon fiber powder.When the content is 20%, compression modulus achieves maximum.The tensile strength of composite materials is greater than the multi-block copolymer we synthesized(tensile strength MAX = 24MPa). With increasing carbon fiber content, tensile strength of epoxy resin / carbon fiber composite gradually increased. when the filler content is 20%, the tensile strength achieves maximum. The damping material has good thermal properties, the decomposition temperature of 260℃-280℃.