UV Stability of Self-Healing Poly(methacrylate) Network Layers

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Abstract

The applicability of high-modulus poly(methacrylate) networks containing reversible Diels-Alder crosslinks as self-healing coatings for outdoor applications, like photovoltaics, is evaluated. The materials are compared before and after accelerated UV-ageing using a combination of spectroscopic techniques, as well as thermogravimetric analysis and kinetic simulations, illustrating polymer network stability. In addition, it is proven by differential scanning calorimetry that the reversibility of the Diels-Alder bonds persists after ageing. Using dynamic mechanical analysis, it is shown that all pristine and UV-aged reversible networks maintain their structural integrity between -80°C and 120°C, and that they exhibit self-healing of micro-defects, allowing the restoration of thermomechanical properties. Furthermore, kinetic modelling is used to simulate the thermal effect on the Diels-Alder conversion during a typical day cycle for photovoltaic modules. The modelling shows that the total Diels-Alder conversion stays high (above 77%), ensuring mechanical robustness of these materials by maintaining a high crosslink density during high temperature exposure and/or temperature cycling, hence illustrating their thermal stability and supporting the potential use of such materials in outdoor photovoltaic applications.
Original languageEnglish
Article number109930
Pages (from-to)1-11
Number of pages11
JournalPolymer Degradation and Stability
Volume199
DOIs
Publication statusPublished - May 2022

Bibliographical note

Funding Information:
The authors acknowledge the financial support of DSM specialty Compounds and Flanders Innovation & Entrepreneurship (VLAIO) for the PhD Baekeland mandate of Dorothee Ehrhardt (HBC.2016.0583) and the Research Foundation - Flanders (FWO-Vlaanderen) for the PhD fellowship of Jessica Mangialetto (1128520 N). The authors thank Dorien Baeten (DSM Applied Science centre) for performing the power output simulations, Jildert Overdijk (DSM Applied Science centre) for carrying out the optical measurements, and Vicky Welslau (DSM Engineering Materials) for UV ageing. Johan Jansen (DSM Applied Science centre) is thanked for many useful discussions and advice.

Funding Information:
The authors acknowledge the financial support of DSM specialty Compounds and Flanders Innovation & Entrepreneurship (VLAIO) for the PhD Baekeland mandate of Dorothee Ehrhardt (HBC.2016.0583) and the Research Foundation - Flanders (FWO-Vlaanderen) for the PhD fellowship of Jessica Mangialetto (1128520 N). The authors thank Dorien Baeten (DSM Applied Science centre) for performing the power output simulations, Jildert Overdijk (DSM Applied Science centre) for carrying out the optical measurements, and Vicky Welslau (DSM Engineering Materials) for UV ageing. Johan Jansen (DSM Applied Science centre) is thanked for many useful discussions and advice.

Publisher Copyright:
© 2022

Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.

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