Improved processability and optimized preparing process for fire‐safe poly (ethylene terephthalate) by electron effect modified Schiff base

Abstract

To get better processability and preparing process of Poly (ethylene terephthalate) polymer, ‐NO2 was used to modify Schiff Base to synthesize a novel flame retardant monomer of 5‐([3‐nitrobenzylidene] amino) isophthalic acid (BNA) to prepare flame retardant and anti‐dripping PET copolyester (BNAnPETs), where the electron effect of ‐NO2 passivate the cross‐linking reactivity of BNA in BNAnPETs to enhance its cross‐linking temperature to improve its processing zone with better processability. The results demonstrated that the cross‐linking temperature of BNAnPETs was improved from the range of (250–348°C) to (355–385°C), and BNA accelerated the reaction of the polycondensation of PET for saving time of 42%. ‐NO2 enhanced the residue char of BNAnPETs in high temperature and further improved its flame retardancy. BNA10PET with 7.2 mol% of BNA had LOI of 31.8% and V‐0 of UL‐94 without drip, and the introduction of –NO2 did not change the flame retardant mechanism in BNAnPETs.

Flame Retarding and Strengthening Poly(ethylene 2,5-furandicarboxylate-co-ethylene terephthalate) Using Phosphonate Containing Genistein

“…Poly­(ethylene terephthalate) (PET) is a fossil-based polymer synthesized using terephthalic acid (PTA) and ethylene glycol. PET has excellent mechanical properties, solvent resistance, heat resistance, and low price and has been used in packaging, decoration, electronics, and electrical appliances. − With the promotion of carbon neutral strategies in the world, bio-based polymers have been of interest specially . Preparation of poly­(ethylene 2,5-furandicarboxylate) (PEF) using furan dicarboxylic acid (FDCA) instead of PTA is the development trend of polyester materials.…”

Highly effective flame retarded TPU introduced by a new phosphorus-containing Schiff base derivative at low addition

“…Schiff base compounds as nitrogen-based ame retardant have been used in many polymer materials in recent years. Such as epoxy resins (EP) [3][4][5][6][7][8][9][10], unsaturated polyesters (UP) [11][12][13], polyethylene terephthalate (PET) [14][15][16], and polyamides (PA) [17][18][19][20][21], etc. Schiff base applied to TPU has also been reported.…”