Structure and characterization for conterminously linked polymer of short‐chain epoxy resin with triallyl isocyanurate and bismaleimide

Abstract

The short-chain epoxy resin (SCER) was prepared direct from epichlorohydrin/bisphenol A (ECH/BPA). The resulted SCER and 4,4 0 -diaminodiphenyl sulfone (DDS) with various weight percent of triallyl isocyanurate/4,4 0 -bismaleimidophenylmethane (TAIC/BMI) were subsequently thermally coreacted to the corresponding high performance materials for high frequency application. They were characterized using potentiometry, Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analyses (TGA), dielectric analyzer, and scanning electron microscope (SEM). Dynamic mechanical analysis (DMA) of polymers showed only a T g indicating a low entropy, amorphous state and formed a conterminously linked polymer. The morphology of polymers revealed no phase separation. The formation of polymer was in good agreement with the proposed molecular structure, and has enhanced good thermal, mechanical, and electric properties. Furthermore, with lower nitrogen content was achieved UL-94 V-0 rating. No fume and toxic gas emission were observed during burning test for this system.

Synthesis of a novel phosphorus-containing curing agent and its effects on the flame retardancy, thermal degradation and moisture resistance of epoxy resins

“…This problem impelled research regarding flame retardancy improvements of epoxy resins and has received much attention. [4,5] Traditionally, halogen flame retardants were widely used as hardeners or additives in epoxy resins to prepare flame retardant materials. Although halogenated compounds showed excellent flame retardant efficiency for epoxy resins and have been widely used for several decades, their use has been curtailed in many regions because of the release of toxic and corrosive fumes during combustion in recent years.…”

Thermosetting bismaleimide resins generating covalent and multiple hydrogen bonds

“…30 Therefore, it is expected that DAIC and BMI similarly react and the allyl-unsubstituted imide group (C@ONHC@O) can form MHB with the diaminotriazine moiety which remains by nonstoichiometric reaction of BMI and ML. In this study, the influence of introduction of MHB into the BMI/DAIC/ML curing system on the thermal and mechanical properties was investigated by changing the feed molar ratio.…”

Synthesis and characterization of a novel epoxy resin based on cyclotriphosphazene and its thermal degradation and flammability performance

“…However, the flammability of epoxy resins leads to fire disaster inevitably, which severely limits their functional applications. Therefore, the epoxy resins are subjected to various mandatory controls for safety reasons [4,5].…”