期刊
CHEMICAL ENGINEERING JOURNAL
卷 374, 期 -, 页码 694-705出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.212
关键词
Benzimidazole; Polyester; Hydrogen bonds; pi-pi Stacking; Fire safety; Anti-dripping
资金
- National Key Research and Development Program of China [2017YFB0309001]
- National Natural Science Foundation of China [51827803, 51721091]
- Sichuan Province Youth Science and Technology Innovation Team [2017TD0006]
Currently, it is still a huge challenge to prepare flame-retardant polymeric materials with excellent fire safety, high strength, good durability and processability. We here propose a H-bonding cross-linking strategy that can simultaneously endow polymers with excellent flame retardancy, non-dripping behavior and enhanced strength. In this work, a novel benzimidazole monomer, 2-(4-methoxycarbonyl-phenyl)-1H-benzimidazole-5-carboxylic acid methyl ester (PBM) has been designed as a H-bonding cross-linking monomer to prepare poly(ethylene terephthalate)-based copolyesters (PET-co-PBMs). Interestingly, along with the hydrogen bonding, the pi-pi stacking interactions from the benzimidazole groups also exist. Due to the formation of physical crosslinking network via hydrogen bonding and pi-pi stacking, the melt strength of copolyesters are greatly improved. Combining with char forming ability of benzimidazole, PET-co-PBMs display excellent fire safety. Moreover, PET-co-PBMs also exhibit higher glass transition temperature, higher mechanical strength and good processability. This work provides a promising strategy to design polymers with high strength, good processability, excellent flame retardance and anti-dripping performance.
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