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Polymers 2018, 10(8), 881; https://doi.org/10.3390/polym10080881

Synthesis of High Molar Mass Poly(phenylene methylene) Catalyzed by Tungsten(II) Compounds

1
ETH Zürich, Department of Materials, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
2
Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse 1, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Received: 19 July 2018 / Accepted: 24 July 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Smart and Modern Thermoplastic Polymer Materials)
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Abstract

Poly(phenylene methylene)s (PPMs) with high molar masses were isolated by polymerization of benzyl chloride catalyzed with tungsten(II) compounds and subsequent fractionation. Four different tungsten(II) catalysts were successfully exploited for the polymerization, for which a strict temperature profile was developed. The PPMs possessed roughly a trimodal molar mass distribution. Simple fractionation by phase separation of 2-butanone solutions allowed to effectively segregate the products primarily into PPM of low molar mass (Mn = 1600 g mol−1) and high molar mass (Mn = 167,900 g mol−1); the latter can be obtained in large quantities up to 50 g. The evolution of the trimodal distribution and the monomer conversion was monitored by gel permeation chromatography (GPC) and 1H NMR spectroscopy, respectively, over the course of the polymerization. The results revealed that polymerization proceeded via a chain-growth mechanism. This study illustrates a new approach to synthesize PPM with hitherto unknown high molar masses which opens the possibility to explore new applications, e.g., for temperature-resistant coatings, fluorescent coatings, barrier materials or optical materials. View Full-Text
Keywords: poly(phenylene methylene); tungsten(II) catalysts; high molar mass; fractionation; chain-growth polymerization; homoconjugation poly(phenylene methylene); tungsten(II) catalysts; high molar mass; fractionation; chain-growth polymerization; homoconjugation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Braendle, A.; Vidovič, C.; Mösch-Zanetti, N.C.; Niederberger, M.; Caseri, W. Synthesis of High Molar Mass Poly(phenylene methylene) Catalyzed by Tungsten(II) Compounds. Polymers 2018, 10, 881.

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