Chemical structure and temperature characteristics of cross-linked polyarylenes, new thermostable binders for reinforced plastics

Zaitsev, B. А.

doi:10.1007/bf00603675

Cited by 3 publications

(12 citation statements)

References 5 publications

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“…It is known that during the formation of high density polymer networks (e.g., three-dimensional polymerization of divinyl-and trivinylbenzenes), large portion of pending unsaturated groups (СH 2 =CH-Ar-) turn out to be blocked inside solid polymer matrix [27]. During heating in air, these groups are subjected to thermo-oxidative destruction in the first place [28]. According to the data of dynamic thermogravimetric analysis (DTGA), considerable weight loss (5-10 wt.%) of ROL samples with a final cure temperature of 250°С is observed at 400± 20°С (Fig.…”

Section: Fig 2 Chemical Structure Of Unsaturated Dimersmentioning

confidence: 99%

High-temperature properties of rolivsan thermosetting resins (network copolymers of (di)vinylaromatic ethers and cyclized (di)methacrylates)

Zaitsev

Shvabskaya

2015

J Polym Res

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Rigid chemical structure provides for excellent thermal and thermo-mechanical properties of heat resistant organic polymers, but affects their fabricability. For the first time a new original chemical approach to the problem of combining high-temperature stability, durability of thermosetting polymers with environmental safety and easy processability has been developed and demonstrated in detail. The key methodological concept was introducing a new structure-forming tool (α-hydroxyethyl)phenylene functional groups) into the chemistry of thermally stable organic polymers. The main goal of this work was to reveal structure-property correlations for rolivsans and products of their cure; using the obtained data would allow to combine resin processability with high thermo-oxidative stability, good heat deformation characteristics and mechanical strength of the prepared polymeric materials. The properties of network copolymers of ( d i ) v i n y l a r o m a t i c e t h e r s w i t h t h e r m o s e n s i t i v e (di)methacrylates and copolymer-based composites were studied. These copolymers were capable of changing their (micro)structure, crosslink density and mechanical properties in the process of thermal treatment. Rolivsan resin compositions with equimolar concentrations of styrene-like and methacrylate end groups have shown optimal combination of fabricability, mechanical strength and heat deflection temperature (HDT). It was found that HDT of rolivsan castings/glassreinforced plastics was 250°C/275°С. Rolivsan copolymers/composites could withstand short-duration temperature spikes (up to 350°C).

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Section: Fig 2 Chemical Structure Of Unsaturated Dimersmentioning

confidence: 99%

High-temperature properties of rolivsan thermosetting resins (network copolymers of (di)vinylaromatic ethers and cyclized (di)methacrylates)

Zaitsev

Shvabskaya

2015

J Polym Res

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“…Thermomechanical properties of crosslinked ROL‐copolymers were described in our earlier publications 6,9–11,19,25,95 . Naturally, these properties depend on the sample composition and the conditions of ROL curing.…”

Section: Resultsmentioning

confidence: 97%

“…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 −1 into a number of carbonyl bands at 1800, 1760, 1700, and 1670 cm −1 (anhydride, carboxylic, keto groups (Figure 6). 6,9–12,19,23,25 )…”

Section: Resultsmentioning

confidence: 99%

“…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 6–18 (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

“…According to the results of earlier studies, the cured ROLs have high thermo‐oxidative stability (250–320°С) and good dielectric properties, which are resistant to hot strong acids and alkalis 20 . ROLs find applications as thermostable non‐porous impregnating compounds (clear castings), sealing compounds, vacuum‐dense glues, protective coatings, and binders for composites 6,9–11,21–36 …”

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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Progress in improving high-temperature properties of thermosetting resins: development of the microheterogeneous model for the formation of crosslinked rolivsan-epoxy blends

2016

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Chemical structure and temperature characteristics of cross-linked polyarylenes, new thermostable binders for reinforced plastics

Cited by 3 publications

References 5 publications

High-temperature properties of rolivsan thermosetting resins (network copolymers of (di)vinylaromatic ethers and cyclized (di)methacrylates)

High-temperature properties of rolivsan thermosetting resins (network copolymers of (di)vinylaromatic ethers and cyclized (di)methacrylates)

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

Progress in improving high-temperature properties of thermosetting resins: development of the microheterogeneous model for the formation of crosslinked rolivsan-epoxy blends

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