Abstract
The highly cross-linked thermoset poly(dicyclopentadiene) (pDCPD) is produced by ring-opening metathesis polymerization and has become an important material for many high-impact applications. Herein, the utility of two less common, yet commercially available ruthenium-based initiators M2 and M22 is disclosed for the polymerization of dicyclopentadiene and compared with the second generation Grubbs catalyst G2. Both initiators are suited to produce pDCPD pieces in high quality (as revealed from mechanical properties of test specimen) and offer a distinctly longer processing window than the reference initiator G2.
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Notes
During the heating run, DCPD decomposes via a retro-Diels–Alder reaction, yielding volatile cyclopentadiene, which is removed by the gas stream applied during the STA measurement. The decomposition reaction can be observed by an endothermic peak of DSC signal and by a continuous mass loss. The decomposition temperature was 69 °C (3 % mass loss at this temperature) under the measurement conditions (see ESI). In real life applications (e.g. RIM) typically closed moulds are used and an according mass loss does not occur under these conditions.
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Acknowledgments
We gratefully acknowledge the EC (CP-FP 211468-2 EUMET) and the Royal Society (University Research Fellowship to C.S.J.C.) for financial support, and Umicore for the gift of Ru complexes.
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Leitgeb, A., Wappel, J., Urbina-Blanco, C.A. et al. Two commercially available initiators for the retarded ring-opening metathesis polymerization of dicyclopentadiene. Monatsh Chem 145, 1513–1517 (2014). https://doi.org/10.1007/s00706-014-1249-y
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DOI: https://doi.org/10.1007/s00706-014-1249-y