Chemical modification of rolivsans with epoxy resins

Zaitsev, B. А.; Kleptsova, L. G.; Shvabskaya, I. D.

doi:10.1134/s1070427217020124

Cited by 2 publications

(16 citation statements)

References 3 publications

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“…[6][7][8][9][10][11] ROLs are low-viscosity monomer/oligomer compositions formed during the acid-catalyzed reaction between bis-[4-(1-hydroxyethyl)-phenyl] ether and methacrylic acid (MAA). They consist of aromatic ethers with styrene-like and methacrylate end groups [6][7][8][9][10][11][12][13][14][15][16][17][18] (Scheme 1).…”

Section: Modification Of Rolivsansmentioning

confidence: 99%

“…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%

“…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. 6,9,11,12,17,19 During further heating in air in the temperature range of 180-300(320 С) and/or exposure at 250-260, 300-320 С (post-curing), the primary network of ROL-copolymer is transformed into the final heat-resistant network (Scheme 3). 6,[9][10][11]17,[23][24][25]31,42 For visualization purposes, the scheme includes only one of the main components that demonstrates the averaged chemical composition and a typical structure of the whole ROL-composition.…”

Section: Rolivsansmentioning

confidence: 99%

“…6,[9][10][11][12] Rearrangement of the primary network structure caused by thermocatalytic transformation of thermosensible methacrylate bridges is reflected in the splitting of the band attributed to methacrylate group -О-С = O at 1715 cm À1 into a number of carbonyl bands at 1800, 1760, 1700, and 1670 cm À1 (anhydride, carboxylic, keto groups (Figure 6). 6,[9][10][11][12]19,23,25 )…”

Section: Ftir Spectroscopy Of Rolsmentioning

confidence: 99%

“…Thermomechanical properties of crosslinked ROLcopolymers were described in our earlier publications. 6,[9][10][11]19,25,95 Naturally, these properties depend on the sample composition and the conditions of ROL curing. The DMA results show that with increasing temperature, the values of the storage (dynamic Young's) modulus E' t C (GPa) decrease in the following manner: 2.60-2,75 25 С , 1.03-1.32 250 С , 0.67-0.82 300 С , 0.44-0.38 350 С .…”

Section: Dma Of the Cured Rolsmentioning

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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