Degradation of recycled flame-retardant GFPBT during extrusion: Effect of screw types on the extrudate properties

Abstract

For both environmental and economic consideration, the use of recycled glass fiber-reinforced flame retardant poly(butylene terephthalate) (RGFFRPBT) is of significant importance. In the study, the mechanical, thermal, rheological, and flame retardant properties of RGFFRPBT granulated by different extruders were evaluated. To explore the relationship between the screw structure and the properties of the extruded RGFFRPBT, the carboxyl content (CC), and intrinsic viscosity ([Formula: see text]) of the processed polymer and the average GF length ([Formula: see text]) were investigated. Increasing the shear force of the extruder caused both [Formula: see text] and [Formula: see text] to decrease, whereas the CC increase. Variations of these parameters had a different effect on the properties of the RGFFRPBT. Both of mechanical and thermal properties of extruded RGFFRPBT deteriorated with the increase of screw shear force, while the thermal flowability improved. Furthermore, all the extruded products were classified as V-0 with LOI of 32.2%, and passed the glow wire ignition temperature test (GWIT). The results confirmed that the degradation of properties of RGFFRPBT can be controlled by screw-type extrusion. RGFFRPBT granulated by a single screw extruder with 30 mm diameter and length to diameter ratio of 30 was found to produce material with properties meeting the requirements for electronic and electrical applications.

Reducing fire hazards and enhancing the thermal stability, acoustical, and UV protection of polyvinyl alcohol using bio-based flame retardant

“…14 It was reported in the literature that various types of flame retardant materials were applied to different kinds of polymers, such as poly (ethylene-co-butyl acrylate), glass fibre reinforced polyaminde 6,6, poly (lactic acid), polystyrene, recycled glass fiber reinforced flame retardant nylon 46 (RGFFRPA46), ethylene-propylene-diene (EPDM) rubber, polypropylene (PP), glass fibre-reinforced polyester (GFRP), recycled glass fiber-reinforced flame retardant poly (butylene terephthalate) (RGFFRPBT), polycarbonate (PC), poly (ethylene terephthalate) (PET), and poly (butylene terephthalate) (PBT) and polyaminde 6,6, to improve their GWFI and glow wire ignition temperature (GWIT) values. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] The flammability properties, including GWFI and GWIT, of these polymer composites are summarized in Table S1 in the supplementary data.…”