Effect of a Dicycloaliphatic Epoxide on the Thermo-Mechanical Properties of Alkyl, Aryl Epoxide Monomers Cured via UV-Induced Cationic Frontal Polymerization
Research output: Contribution to journal › Article › Research › peer-review
Standard
In: Macromolecular materials and engineering, Vol. 307.2022, No. 7, 2100976, 07.2022.
Research output: Contribution to journal › Article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex - Download
}
RIS (suitable for import to EndNote) - Download
TY - JOUR
T1 - Effect of a Dicycloaliphatic Epoxide on the Thermo-Mechanical Properties of Alkyl, Aryl Epoxide Monomers Cured via UV-Induced Cationic Frontal Polymerization
AU - Malik, Muhammad Salman
AU - Wolfahrt, Markus
AU - Sangermano, Marco
AU - Schlögl, Sandra
N1 - Publisher Copyright: © 2022 The Authors. Macromolecular Materials and Engineering published by Wiley-VCH GmbH.
PY - 2022/7
Y1 - 2022/7
N2 - Radical induced cationic frontal polymerization (RICFP) is a promising route to achieve rapid curing of epoxy-based thermosets, requiring only a localized exposure with UV light. In the presence of a diaryliodonium-based photoinitiator and a thermal radical initiator, a self-sustaining hot front cures epoxide monomer via a cationic mechanism. However, the cationic polymerization of diglycidyl ether derivatives is slow (in comparison with other epoxides with higher reactivity) and, as a consequence, frontal polymerization is sluggish because the heat loss is not compensated by the rate of heat release. Cycloaliphatic epoxies possess a higher ring strain than diglycidyl ether derivatives and can be blended with the latter to increase its rate of frontal polymerization. In the current work, a comprehensive study on the influence of 3,4 epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (CE) on cure kinetics, viscosity, front velocity, mechanical, and thermo-mechanical properties of frontally cured bisphenol A diglycidyl ether derivatives is presented. The results show a direct relationship between frontal velocity and amount of reactive diluent while an inverse relationship with the storage viscosity is observed. It is found that increasing the content of cycloaliphatic epoxide reduces the glass transition but increases mechanical properties of frontally cured bisphenol A diglycidyl ether derivatives.
AB - Radical induced cationic frontal polymerization (RICFP) is a promising route to achieve rapid curing of epoxy-based thermosets, requiring only a localized exposure with UV light. In the presence of a diaryliodonium-based photoinitiator and a thermal radical initiator, a self-sustaining hot front cures epoxide monomer via a cationic mechanism. However, the cationic polymerization of diglycidyl ether derivatives is slow (in comparison with other epoxides with higher reactivity) and, as a consequence, frontal polymerization is sluggish because the heat loss is not compensated by the rate of heat release. Cycloaliphatic epoxies possess a higher ring strain than diglycidyl ether derivatives and can be blended with the latter to increase its rate of frontal polymerization. In the current work, a comprehensive study on the influence of 3,4 epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (CE) on cure kinetics, viscosity, front velocity, mechanical, and thermo-mechanical properties of frontally cured bisphenol A diglycidyl ether derivatives is presented. The results show a direct relationship between frontal velocity and amount of reactive diluent while an inverse relationship with the storage viscosity is observed. It is found that increasing the content of cycloaliphatic epoxide reduces the glass transition but increases mechanical properties of frontally cured bisphenol A diglycidyl ether derivatives.
KW - cationic curing
KW - cycloaliphatic epoxy
KW - frontal polymerization
KW - ultraviolet light
UR - http://www.scopus.com/inward/record.url?scp=85124593879&partnerID=8YFLogxK
U2 - 10.1002/mame.202100976
DO - 10.1002/mame.202100976
M3 - Article
AN - SCOPUS:85124593879
VL - 307.2022
JO - Macromolecular materials and engineering
JF - Macromolecular materials and engineering
SN - 1438-7492
IS - 7
M1 - 2100976
ER -