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

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 three‐dimens...

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Bibliographic Details
Published in:Polymer engineering and science 2023-07, Vol.63 (7), p.1874-1889
Main Authors: Zaitsev, Boris A., Kleptsova, Larisa G., Shvabskaya, Irina D.
Format: Article
Language:English
Subjects:
Analysis
Bisphenol A
Bisphenol A dicyanate
Block copolymers
Calorimetry
Chemical reactions
Crosslinked polymers
Crosslinking
cyclotrimerization reactions
Dynamic mechanical analysis
Epoxy resins
Fourier transforms
free‐radical crosslinking copolymerization
Infrared analysis
Infrared spectroscopy
Interlayers
Mechanical properties
Microreactors
Oligomers
Phenols
polycyanurates
Polymer blends
Polymers
Thermal properties
Thermomechanical properties
Thermosetting resins
unsaturated thermosetting resins
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Summary: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 three‐dimensional 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. A novel approach to structural and chemical modification of unsaturated thermosetting resins is discussed. This approach is aimed at the improvement of thermal, adhesion, mechanical, and other useful properties of network polymers and composite materials prepared on the basis of these polymers. The current review discusses the efficiency of application of the new method of modification of ROLs with cyanate esters, namely, with BADCy. When the BADCy component of a ROLs/BADCy blend played the role of a polyfunctional (modifying) additive (5–7.5 wt%) that migrated into “micro‐reactors” and entered into ter‐molecular and other reactions, the final cross‐linked ROL‐BADCy blends had better high‐temperature strength, higher stabil
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.26378