High-temperature chemical transformations of tetracarboxylic acid dianhydrides with aromatic diamines in rolivsan matrix

Zaitsev, B. А.; Shvabskaya, I. D.

doi:10.1134/s1070427217080250

Cited by 1 publication

(3 citation statements)

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“…20 ROLs find applications as thermostable non-porous impregnating compounds (clear castings), sealing compounds, vacuum-dense glues, protective coatings, and binders for composites. 6,[9][10][11][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] The following polyfunctional compounds were studied as target additives (admixtures inactive in TFRP): epoxy resins, 10,11,[37][38][39][40][41][42][43] aromatic diamines, [44][45][46][47] aromatic tetra-amines and dianhydrides of aromatic tetracarbon acids. 48 Chemical modification with these compounds improved thermal, strength and adhesive properties of the cured ROLs.…”

Section: Modification Of Rolivsansmentioning

confidence: 99%

“…Non-catalyzed neat ROLs are rapidly cured at elevated temperatures 6,[9][10][11][12]16,[18][19][20][21][22][23][24][25][26][27][28][29][30]35,[42][43][44][45][46][47][48] or in the presence of acidic catalysts, 6,25 maleic anhydride, 36 bismaleimides, 36 etc. At 140-170 С, unsaturated aromatic ethers and esters incorporated into ROLs undergo threedimensional radical polymerization (TFRP) and yield a densely cross-linked glassy copolymer with a primary polymer network.…”

Section: Rolivsansmentioning

confidence: 99%

“…The following polyfunctional compounds were studied as target additives (admixtures inactive in TFRP): epoxy resins, 10,11,37–43 aromatic diamines, 44–47 aromatic tetra‐amines and dianhydrides of aromatic tetracarbon acids 48 . Chemical modification with these compounds improved thermal, strength and adhesive properties of the cured ROLs.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

Zaitsev

Kleptsova

Shvabskaya

2023

Polymer Engineering & Sci

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The present work discusses the experimental verification of the efficiency of a new method of chemical modification of thermosetting resins. The method is based on the use of (nano)micron-sized interlayers that appear between densely crosslinked grains of a glassy network polymer during threedimensional radical polymerization of unsaturated monomers (oligomers). These interlayers act as self-contained microreactors, into which different polyfunctional compounds can be introduced for carrying out the desired chemical reactions. Thermal and dynamic mechanical analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy were used to investigate the influence of regimes of thermocatalytic co-curing of rolivsan unsaturated resins (ROLs) with bisphenol A dicyanate (BADCy) on thermal and thermomechanical properties of the obtained crosslinked polymers. It was found that the cured ROL/BADCy blends with high (25-50 wt%) content of the BADCy component had less favorable thermal and mechanical parameters than the cured neat ROL. When the BADCy component of a ROL/BADCy blend played the role of a polyfunctional (modifying) additive (5-7.5 wt%) that migrated into "microreactors" and entered into ter-molecular and other reactions, the final cross-linked ROL-BADCy blends had better high-temperature strength, higher stability against thermo-oxidative and hydrolytic destruction than the individual components (i.e., the cured neat ROL and the cured neat BADCy). As the chemical structure may comprise two networks covalently bound to each other, they can be considered as block copolymers. The obtained results confirm the efficiency of the proposed method of chemical modification of unsaturated thermosetting resins, such as ROLs.

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