Miscibility, Microstructure, and Thermal and Dielectric Properties of Reactive Blends of Dicyanate Ester and Diamine-Based Benzoxazine

Abstract

This study discusses the miscibility, microstructure, and the thermal and dielectric properties of the reactive blends of dicyanate ester of bisphenol A and diaminebased benzoxazine. DSC and IR were applied to monitor the curing reactions of the reactive blends. Three reactions were observed in the curing reactions: the first is the cyclotrimerization of cyanate ester, producing the triazine structure; the second is the coreaction between the triazine structure and benzoxazine, forming alkyl isocyanurate and diphenyl ether linkages, followed by the further reaction of the isocyanurate linkage; and the third is the ring-opening of benzoxazine. The coreaction decomposes the polycyanurate structures and brings parts of the polycyanurate structures into the polybenzoxazine matrix. Thus, a miscible blend can be achieved in all compositions, as judged by the single composition-dependent Tg in the dynamic mechanical and thermal mechanical analyses. The experimental data also show that the dimensional stability and dielectric properties are enhanced via the reactive blends

The curing reaction of benzoxazine with bismaleimide/cyanate ester resin and the properties of the terpolymer

“…Lin et al reported that the alkyl isocyanurate and diphenyl ether linkages, which result from the coreaction of triazine and benzoxazine, randomly link the polycyanurate and polybenzoxazine domains, leading to a homogeneous thermosets between BOZ and BADCy. As shown in Scheme 1, the coreaction decomposes the polycyanurate structures, bringing parts of the polycyanurate structures into the polybenzoxazine matrix [13].The reaction between maleimide and cyanate ester will continue and lead to the pyrimidine and/or pyridine structures structure, as observed by Lin et al [17]There is only a single T g existed so that we speculate further reactions between BOZ and BMI. The further reactions explain the intensity of Due to the strong interaction of intermolecular or intramolecular hydrogen bonds between the phenolic hydroxyl groups and the adjacent phenolic hydroxyl groups, or the N atoms on the Mannich bridges, or the p electrons on the benzene rings in the chemical structures of polybenzoxazine, PBOZ has the highest glassy modulus.…”

“…Nair et al reported that a copolymerzation between the cyanate ester and benzoxazine resin and postulated a triazineeetherebenzoxazine network [12]. Lin et al studied that the coreaction decomposes the polycyanurate structures and brings parts of the polycyanurate structures into the polybenzoxazine matrix [13]. Furthermore, Li et al investigated the curing procedure of the benzoxazineecyanateeepoxy system and the properties of the terpolymer [14].…”

Synthesis of a phosphinated tetracyanate ester and its miscible blend with 4,4′-oxydianiline/phenol-based benzoxazine

“…Based on our previous work, 27 the cyclotrimerization of cyanate ester is faster than ring-opening polymerization of benzoxazine. This result is consistent with those reported by Nair et al, 31 Kimura et al, 32 Gu et al, 33 and Lin et al 27 in the studies of cyanate ester/benzoxazine blend. Both exothermic temperature of oda50 is much lower than those of neat (4) and P-oda, showing a forward polymerization.…”

High performance benzoxazine/CNT nanohybrid network – An easy and scalable way to combine attractive properties

“…Preparation and characterization of P-pPDA precursor P-pPDA resin precursor was successfully prepared by a solventless synthesis from 1,4-phenylene diamine with an easy and scalable procedure according to a reaction depicted in Scheme 1. The presence of insolubles coming from residual triaza compound is not a problem as such, as a co-reaction of triazine with benzoxazine can also occur and participate in the curing reaction [32]. However, the preparation of homogeneous nanocomposites requires a neat resin.…”