Structural organization in rolivsan and polyrolivsan

Lukasov, S. V.; Kallistov, O. V.; Nasledov, D.M.; Sukhanova, T.Ye.; Kalinina, N. A.; Zaitsev, B. А.; Tsygankova, T. S.; Sidorovich, A. V.

doi:10.1016/0032-3950(88)90376-0

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…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%

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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Section: Dma Of the Cured Rolsmentioning

confidence: 99%

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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“…Some of the more common thermosets include epoxies, polyester, vinyl ester, phenolics, amino resins, bismaleimides, polyimides and polyamides. Unsaturated polyester resins that provide a unique combination of room-temperature processability in the uncured state and hightemperature (200 3 C) stability in the cured state have been the subject of several reports [2][3][4][5][6][7][8]. Polyesters are becoming increasingly popular because of their low cost, ease of use and versatility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of N,N'-bismaleimido-4,4'-diphenyl methane — Vinyl Ester Oligomer Modified Unsaturated Polyester Interpenetrating Matrices for Advanced Composites

Sharmila¹,

Alagar

Chozhan

2007

High Performance Polymers

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An intercrosslinked network of hybrid bismaleimide-modified vinyl ester oligomer-unsaturated polyester matrix systems were developed. Vinyl ester oligomer was used as a toughening agent for unsaturated polyester resin and was added in 10, 20 and 30% (by weight). Benzoyl peroxide was used as curing agent. The vinyl ester oligomer-toughened unsaturated polyester matrix systems were further modified with 5, 10 and 15% (by weight) of bismaleimide. Bismaleimide-modified vinyl esterunsaturated polyester matrices were characterized by mechanical (tensile strength, flexural strength, tensile modulus, flexural modulus and impact strength), thermal [differential scanning calorimetry (DSC) thermogravimetic analysis (TGA) and heat deflection temperature analysis (HDT)] and morphological studies [scanning electron microscope (SEM)] and water absorption. Data obtained from mechanical and thermal studies indicated that the introduction of vinyl ester oligomer into unsaturated polyester resin improved the fracture toughness with marginal reduction in the values of heat deflection temperature and glass transition temperature. The introduction of bismaleimide into vinyl ester oligomer-incorporated unsaturated polyester resin enhanced both thermal and mechanical behavior. The SEM micrographs of fractured surfaces of vinyl ester oligomer modified unsaturated polyester systems and BMI modified vinyl ester-unsaturated polyester matrices illustrate the presence of heterogeneous morphology.

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“…[3][4][5][6][7][8][9] These resins are mixtures of various compositions of oligomers and difunctional aromatic monomers with styrenic or methacrylic functionality ( Fig. 1.)…”

Section: Introductionmentioning

confidence: 99%

“…Unsaturated polyester resins that provide a unique combination of room‐temperature processability in the uncured state and high‐temperature (>200°C) stability in the cured state have been the subject of several reports 3–9. These resins are mixtures of various compositions of oligomers and difunctional aromatic monomers with styrenic or methacrylic functionality (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the mixture composition, the resulting resins range in physical state from liquids (with a very wide range of viscosities) to solids (with liquification points ranging from 25 to 115°C). The formation of a crosslinked matrix from the resin mixture with either thermal or catalytic curing has been studied in detail 4–6. Typically, the resins were hardened with very lengthy (>24 h) curing regimes with gradual increases in temperature 6…”

Section: Introductionmentioning

confidence: 99%

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Properties and toughening of heat‐resistant thermosets based on unsaturated ester resins

Canelas

Abbey

Fentress

2002

J of Applied Polymer Sci

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ABSTRACT:We describe our investigations of the curing chemistry and properties of heat-resistant thermosets comprised of unsaturated ester resins. We suggest a mechanism for the rearrangement of the cured matrix and volatile evolution during the curing process. We employed dielectric spectroscopy (DES) as a tool for monitoring the extent of cure, determining glass-transition temperatures, and evaluating electrical properties of the resins. We compare and contrast results obtained by DES to results obtained by dynamic mechanical analysis (DMA). Fracture testing showed that improvements were made in the toughness of these materials by blending the uncured resin with impact modifiers such as hydrocarbon or silicone reactive rubber adducts or poly(arylene ether sulfone)-based thermoplastic oligomers. We determined the effects of the thermoplastic toughening additive's molecular weight, concentration, and endgroup functionality on the phase separation, thermal stability, and fracture toughness of the blend.

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Structural organization in rolivsan and polyrolivsan

Cited by 4 publications

References 9 publications

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

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

Synthesis and Characterization of N,N'-bismaleimido-4,4'-diphenyl methane — Vinyl Ester Oligomer Modified Unsaturated Polyester Interpenetrating Matrices for Advanced Composites

Properties and toughening of heat‐resistant thermosets based on unsaturated ester resins

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