| Poly(ethylene terephthalate) (PET) fabric have been widely used in many fields, however, the melting drip during burning of PET fabric is still a problem need to be solved. Photo-induced surface grafting with glycidyl methacrylate (GMA) as monomer in association with a pad-curing treatment by using a flame retardant (FR) solution which contains 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP) and sulfamic acid (H2NSO3H) was used to improve the fire performance of PET fabric in this study. The effects of initiator concentration, monomer concentration and the irradiation time on the grafting percentage (Gp) were investigated. The chemical structure of grafted surface of the PET fabric was characterized by an attenuated total reflection-infrared (ATR-IR) spectroscopy. According to the above analysis, the mechanism of photografting GMA monomer onto the PET fabric surface has been proposed in this study. The LOI and the vertical flammability test indicate that this method could improve dripping resistance to PET fabric and LOI value can reach up to 25.9. Thermal behaviour of PET fabric treated with this system was investigated by thermogravimetic (TG) and differential scanning calorimetry (DSC) experiments. The results indicate that residual char of treated samples can reach 15.7% at 650℃which is much higher than that of the untreated fabric. SEM graphs of residue of treated and untreated PET fabric show that FR could promote formation of residual char which could improve the anti-dripping property to PET fabric.Photo-induced surface grafting with acrylamide (AM) as monomer was also been used to improve the fire performance of PET fabric in this study.Ammonium phosphate, pentaerythritol, urea,1,2,5,6,9,10-hexabrmocyclododecane and diphenyl isooctyl phosphate were also used to improve flame retardancy of PET fabric. LOI and vertical flammability tests were used to characterize the fire performance.
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