Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76054
Title: Economical and environment-friendly synthesis of a novel hyperbranched poly(aminomethylphosphine oxide-amine) as co-curing agent for simultaneous improvement of fire safety, glass transition temperature and toughness of epoxy resins
Authors: Ma, C
Qiu, SL
Yu, B 
Wang, JL
Wang, CM
Zeng, WR
Hu, Y
Keywords: Hyperbranched polymer
Poly(aminomethylphosphine oxide-amine)
Epoxy resin
Fire safety
Glass transition temperature
Toughening
Issue Date: 2017
Publisher: Elsevier
Source: Chemical engineering journal, 2017, v. 322, p. 618-631 How to cite?
Journal: Chemical engineering journal 
Abstract: Epoxy resins inherently suffer flammability and brittleness. Various approaches have been used to improve their fire safety or toughness, however, glass transition temperature (T-g) is always deteriorated concomitantly. Herein, a novel hyperbranched poly(aminomethylphosphine oxide-amine) (HPAPOA) was synthesized from alpha-aminomethylation reaction of trihydroxymethylphosphine (THP) with piperazine before oxidation. THP was prepared from tetrakis(hydroxymethyl)phosphonium sulfate and barium hydroxide to avoid complex purification in the synthesized process. When HPAPOA was utilized as co curing agent for epoxy resins, T-g and impact strength of epoxy thermosets are improved due to the increased cross-linking density and the multiple toughening mechanisms. Simultaneously, fire safety include flame retardancy, smoke suppression and toxicity reduction is raised (except 1.0 wt added). The condensed phase flame retardant mechanism is verified as increased char yield and protective and barrier effect of the formed char layer and the gas phase for release of phosphorus-containing species of HPAPOA. With as low as 3.0 wt% HPAPOA incorporated, epoxy thermoset achieved vertical burning V-0 rating with a limited oxygen index of 30.7%. The blowing-out effect for upgradation of vertical burning rating is elucidated. Moreover, the curing reactivity of epoxy systems is slightly changed and the reaction activation energy is elevated. The thermal decomposition temperature of epoxy thermoset diminishes. With 2.0 wt% HPAPOA added, tensile and flexural properties are improved and those with other contents are slightly depressed. The practical HPAPOA modified epoxy thermosets with obvious disadvantage conquered and higher T-g can be used in industries for high-performance applications.
URI: http://hdl.handle.net/10397/76054
ISSN: 1385-8947
EISSN: 1873-3212
DOI: 10.1016/j.cej.2017.04.070
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

6
Citations as of May 12, 2018

WEB OF SCIENCETM
Citations

5
Last Week
2
Last month
Citations as of May 20, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.