Synthesis and characterization of epoxy-anhydride polymers modified by polyfluoroaromatic oligoimides

Abstract

Technique of the preparation of the anhydrideterminated polyfluoroaromatic oligoimides from tetrafluorophenylene or hexafluoronaphthylene diamines and oxydiphthalic anhydride was elaborated. These compounds were used as modifiers and cohardeners for an epoxyanhydride formulation composed of resin DGEBA and isomethyltetrahydrophthalic anhydride. Curing parameters of the modified epoxy-imide formulations were investigated using DSC, DMA, and FTIR spectroscopy. The modified epoxy polymers containing the polyfluoroaromatic imide fragments have improved thermomechanical and thermooxidative characteristics and hydrophobicity. The modifiers exert a positive effect on the elastic modulus, flexural strength, and dielectric permittivity of the epoxy-anhydride polymers when their amount reaches 20-30 pbw. The anhydride-terminated polyfluoroaromatic oligoimides appears to be promising for the preparation of epoxy polymers with improved performance.

Features of the experimental determination of the elastic characteristics of epoxy resin with the addition of silicon dioxide nanoparticles

“…The ratio of powder, hardener and resin was 2:80:100, respectively. The resulting mixture was poured into aluminum flat forms and placed in an FD53 drying oven (Binder, Germany) for further curing [5,6]. Curing was carried out in a stepped mode of 100° C/2 h +160° C/10 h +110° C/2 h with an accuracy of 2°.…”

The influence of magnetic fields on the strength of modified epoxy resin composites

“…Так, кремниевая микроразмерная добавка способствовала улучшению прочностных характеристик на 10-15 % [21]. При этом добавление наночастиц кремния позволило увеличить прочность на сжатие эпоксидных композитов на 30 % [22].…”

Formation of the Structure and Properties of Epoxy-Based Composite Materials

“…Despite this, a significant effect is achieved. The addition of 1.2 % silicon dioxide nanopowder sized in the above range increases the modulus of elasticity by 35% and fracture strength by 30% [6]. Picture 1 shows the result of tests.…”

“…1. Plot of the "related" modulus of elasticity of samples with different amount of filler [6] It is possible to improve the mechanical characteristics of the composite material based on epoxy resins using different combinations of fillers. The use of fillers in the size range of 130-150 nm and 0.5-10 µm based on aluminum powder significantly improves the characteristics of the composite [7].…”