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Designing Branched Deoxybenzoin Polyesters as Polymeric Flame Retardants

Author:
Stubbs, Elizabeth, Brown, Moira, Steele, Anna, Song, Cheng, Emrick, Todd
Source:
Journal of polymer science 2019 v.57 no.16 pp. 1765-1770
ISSN:
0887-624X
Subject:
calorimetry, combustion, esterification, flame retardants, heat, molecular weight, polyesters, polymerization, silylation
Abstract:
AB₂ monomers present opportunities to conduct one‐pot syntheses of highly branched or “hyperbranched” polymers, which are known for their distinct physical and chemical properties relative to linear polymers. This paper describes the synthesis of a deoxybenzoin‐containing AB₂ monomer and its use in step‐growth polymerization to prepare branched aromatic polyesters. Highly soluble deoxybenzoin polymers were obtained with degrees of branching reaching 0.36 and estimated molecular weights approaching 20 kDa. The phenolic chain ends of the polymer allowed for post‐polymerization modification by silylation and esterification chemistry. TGA and microscale combustion calorimetry revealed these novel aromatic polyesters to possess the critically important characteristics of flame‐retardant polymers, such as high char yield and low heat release. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1765–1770
Agid:
6562843