Flame retardance and shrinkage reduction of polystyrene modified with acrylate-containing phosphorus and crosslinkable spiro-orthoester moieties |
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| Authors: | J Canadell AG Cook V Cádiz |
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| Institution: | a Departament de Química Analítica i Química Orgánica, Universitat Rovira i Virgili, Marcel.li Domingo s/n, 43007 Tarragona, Spain
b Polymer Centre, Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom |
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| Abstract: | Styrene was radically copolymerized with a spiro-orthoester with an acrylate group (SOE-AC), and terpolymerized with SOE-AC and diethyl(methacryloyloxymethyl)phosphonate (DEMMP). This was done for several different feed ratios, to obtain polymers with spiro-orthoester moieties in the side chain. These polymers were then crosslinked with ytterbium triflate, as cationic initiator, via the double ring-opening polymerization. The thermal stability and fire retardant properties of these materials were evaluated by TGA and LOI. The DEMMP-containing polymers give materials which were significantly more flame retardant than the nonphosphorus-containing materials, as indicated by the LOI measurements. The volume changes measured upon crosslinking of the polymers were evaluated by density measurements with a gas pycnometer. In all the cases, expansion was observed. This indicates that SOE-AC is an effective monomer for crosslinkable polymers without volume changes. |
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| Keywords: | Styrene Spiro-orthoester Radical polymerization Heteroatom-containing polymer Cationic crosslinking |
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