Polymerization of Aliphatic Aldehydes (1)

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Abstract
Polyacetals of higher aliphatic aldehydes have been prepared as amorphous, elastomeric polymers and as crystalline, isotactic polymers. They are prepared by solution polymerization or bulk polymerization with appropriate cationic and anionic initiators at low temperature. The polyaldehydes obtained are thermally unstable and must be end-capped. Aliphatic aldehydes with such functional groups as alkoxy, cyano, vinyl, and epoxy that do not interfere with the polymerizations have also been polymerized. Glutaraldehyde and succinaldehyde have been cyclopolymerized to polyacetals consisting almost completely of pyrane and tetrahydrofuran rings. Copolymerization of higher aldehydes with other aldehydes, such as n-butyraldehyde with isobutyraldehyde or acetaldehyde with formaldehyde, have been described. Copolymers with comonomers other than aldehydes, namely with isocyanates, have recently been reported

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