Cross‐linked Salen‐based polyphosphazenes (Salen‐PZNs) enhancing the fire resistance of epoxy resin composites. Issue 4 (29th July 2020)

• Record Type: Journal Article
• Authors: Zhang, Yabin; Cui, Jinfeng; Wang, Lurong; Yu, Hailong; Li, Fuchong; Yang, Baoping; Guo, Junhong; Mu, Bo; Tian, Li
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 4(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-07-29
• Subjects: applications -- flame retardance -- polycondensation -- resins; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.49727
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: In this work, two cross‐linked Salen‐based polyphosphazenes (Salen‐PZNs: Salen‐PZN‐1 microspheres and layered Salen‐PZN‐2), which contains Salen‐Schiff base and phosphazene components, were synthesized. The results showed that the peak heat release rate and total smoke production of 3% Salen‐PZN‐1/epoxy resin (EP) (3 wt% addition) were reduced by 23.8% and 87.3%, respectively. Meanwhile, after introducing the layered Salen‐PZN‐2 into EP, efficient flame resistance was obtained. The results of thermogravimetric analysis/infrared spectrometry proved that the harmful gasses of 5% Salen‐PZN‐1/EP composites were reduced during the combustion. The possible flame retardancy mechanism was considered to be the synergy of phosphate group catalysis, release of nitrogen‐containing noncombustible gasses and gas phase quenching. Therefore, this work provides a method for preparing polymers with highly efficient flame‐retardant properties. Abstract : Schematic representation for the preparation of cross‐linked Salen‐PZNs.