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Issue 12, 2011
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Preparation of flame-retarding poly(propylene carbonate)

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A preparative method for a flame-retarding poly(propylene carbonate) (PPC) was demonstrated by employing diphenylphosphinic acid (Ph2P(O)(OH)), phenylphosphonic acid (PhP(O)(OH)2), or phosphoric acid (P(O)(OH)3) as a chain transfer agent in the immortal CO2/propylene oxide copolymerization catalyzed by a highly active catalyst, a cobalt(III) complex of a Salen-type ligand tethered by four quarternary ammonium salts (1). High turnover frequencies of 10 000–20 000 h−1 (700–1300 g-polymer per g-cat·h) were maintained even in the presence of a large amount of the protic chain transfer agent ([–OH]/[1], 1600–200). Directly after the copolymerization using PhP(O)(OH)2 as a chain transfer agent, thermoplastic polyurethane (TPU) was formed by adding a stoichiometric amount of toluene-2,4-diisocynate. The TPU also was not inflammable. Cone calorimeter studies showed that PPC itself and TPU prepared using PPC-diol emitted significantly less smoke while burning than common plastics, such as polystyrene.

Graphical abstract: Preparation of flame-retarding poly(propylene carbonate)

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Publication details

The article was received on 20 Jun 2011, accepted on 22 Sep 2011 and first published on 25 Oct 2011

Article type: Paper
DOI: 10.1039/C1GC15722A
Green Chem., 2011,13, 3469-3475

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    Preparation of flame-retarding poly(propylene carbonate)

    A. Cyriac, S. H. Lee, J. K. Varghese, J. H. Park, J. Y. Jeon, S. J. Kim and B. Y. Lee, Green Chem., 2011, 13, 3469
    DOI: 10.1039/C1GC15722A

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