Issue 8, 2018

A novel post-polymerizable polynorbornene prepared via ROMP: easy synthesis and conversion into a free-standing film with high Tg and low dielectric constant

Abstract

A novel linear silicon-containing polynorbornene (BCB-PNB, Mn = 93 000 g mol−1) with thermo-crosslinkable benzocyclobutene side chains was synthesized through ring-opening metathesis polymerization (ROMP). This polymer displayed good solubility and film-forming ability. After post-polymerization at high temperature, a free-standing film based on BCB-PNB was easily converted to a crosslinked network, which exhibited a dielectric constant of 2.60 for frequencies ranging from 40 Hz to 30 MHz. In particular, this crosslinked film exhibited a high Tg of up to 400 °C, which was much higher than that of the previously reported polynorbornenes prepared by ROMP. This is the first example of a polynorbornene prepared by ROMP with such a high Tg and good processability. Besides, the crosslinked film also displayed high hydrophobicity. These results indicate that the introduction of thermo-crosslinkable benzocyclobutene groups into polynorbornene side chains can greatly enhance the properties of the polymers. This work also develops a facile method for the preparation of a new free-standing post-polymerizable polynorbornene film.

Graphical abstract: A novel post-polymerizable polynorbornene prepared via ROMP: easy synthesis and conversion into a free-standing film with high Tg and low dielectric constant

Article information

Article type
Research Article
Submitted
03 May 2018
Accepted
27 May 2018
First published
28 May 2018

Mater. Chem. Front., 2018,2, 1467-1474

A novel post-polymerizable polynorbornene prepared via ROMP: easy synthesis and conversion into a free-standing film with high Tg and low dielectric constant

J. Wang, J. Zhou, L. Fang, J. Sun and Q. Fang, Mater. Chem. Front., 2018, 2, 1467 DOI: 10.1039/C8QM00201K

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