Diblock Copolymers Containing Titanium-Hybridized Polyhedral Oligomeric Silsesquioxane Used as a Macromolecular Flame Retardant for Epoxy Resin

Ruirui Zhou; Lijie Lin; Birong Zeng; Xindan Yi; Chenyu Huang; Kunpeng Du; Xiaohui Liu; Yiting Xu; Conghui Yuan; Lizong Dai

doi:10.3390/polym14091708

Polymers (Apr 2022)

Diblock Copolymers Containing Titanium-Hybridized Polyhedral Oligomeric Silsesquioxane Used as a Macromolecular Flame Retardant for Epoxy Resin

Ruirui Zhou,
Lijie Lin,
Birong Zeng,
Xindan Yi,
Chenyu Huang,
Kunpeng Du,
Xiaohui Liu,
Yiting Xu,
Conghui Yuan,
Lizong Dai

Affiliations

Ruirui Zhou: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Lijie Lin: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Birong Zeng: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Xindan Yi: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Chenyu Huang: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Kunpeng Du: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Xiaohui Liu: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Yiting Xu: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Conghui Yuan: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
Lizong Dai: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China

DOI: https://doi.org/10.3390/polym14091708
Journal volume & issue: Vol. 14, no. 9
p. 1708

Abstract

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In this paper, the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-containing diblock copolymer poly[(p-hydroxybenzaldehyde methacrylate)m-b-(2-((6-oxidodibenzo[c,e][1,2]oxaphosphinin-6-yl)oxy)ethyl methacrylate)n] (abbrev. poly(HAMAm-b-HEPOMAn)) was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization. When it was continued to react with titanium-hybridized aminopropyl-polyhedral oligomeric silsesquioxane (Ti-POSS) through a Schiff-base reaction, new grafted copolymers poly[(Ti-POSS-HAMA)m-b-HEPOMAn] (abbrev. PolyTi) were obtained. Then, they were used as macromolecular flame retardant to modify epoxy resin materials. The thermal, flame retardant and mechanical properties of the prepared EP/PolyTi composites were tested by TGA, DSC, LOI, UL-94, SEM, Raman, DMA, etc. The migration of phosphorus moiety from epoxy resin composites was analyzed by immersing the composites into ethanol/H2O solution and recording the extraction solution by UV-Vis spectroscopy. The results showed that the added PolyTi enhanced the glass transition temperature, the carbon residue, the graphitization of char, LOI, and mechanical properties of the EP/PolyTi composites when compared to pure cured EP. Furthermore, the phosphorus moieties were more likely to migrate from EP/DOPO composites than that from EP/PolyTi composites. Obviously, compared with small molecular flame retardant modified EP, the macromolecular flame retardant modified EP/PolyTi composites exhibited better thermal stability, flame retardancy, and resistance to migration.

Published in Polymers

ISSN: 2073-4360 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/polymers/

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