Application of self-templated PHMA sub-microtubes in enhancing flame-retardance and anti-dripping of PET. (August 2018)

• Record Type: Journal Article
• Authors: Wang, Chang; Wu, Liping; Dai, Yamin; Zhu, Yuxi; Wang, Bijia; Zhong, Yi; Zhang, Linping; Sui, Xiaofeng; Xu, Hong; Mao, Zhiping
• Is Part Of: Polymer degradation and stability. Volume 154(2018)
• Page Start: 239
• Page End: 247
• Publication Date: 2018-08
• Subjects: PHMA sub-microtubes -- Self-templated -- Flame-retarded PET -- Anti-dripping; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2018.06.005
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: Tubular one-dimensional poly (cyclotriphosphazene-melamine) (PHMA) sub-microtubes were conveniently synthesized from co-polymerization of hexachloro -cyclotriphosphazene and melamine. The SEM and TEM results showed PHMA sub-microtubes were opened at one end with diameters of 100–300 nm and lengths of 1–10 μm. The inner diameters of closed and open end were 10–30 nm and 50–100 nm, respectively. The PHMA sub-microtubes were melt blended with PET (PET/PHMA) to be used as an effective flame retardant. The flame-retardant and anti-dripping properties of PET/PHMA composites were evaluated by TGA, LOI, vertical burning, MCC and rheological test. The results confirmed the efficiency of PHMA in enhancing the self-extinguishing ability and inhibiting melt-dripping of PET. The morphological characteristics and graphitic structure of the charred residues were evaluated by SEM, Raman spectroscopy. Results demonstrated the formation of a compact protective carbon layer and a carbonaceous micro-structures, which acted as insulator against oxygen and heat. Highlights: PHMA sub-microtubes were conveniently melt blended with PET for enhancing flame retardancy and anti-dripping properties. PET/FR5.0 composites achieved effective flame retardancy, presented by LOI value of 31.5±0.1 and UL94 V-0 grade. Compact and stable carbon layer played an important role in prohibiting combustion. Anti-dripping properties of PET was achieved by higher complex viscosity and cross-linking interaction.