玻璃纤维改性阻燃PET复合材料制备与性能研究OA

A combined surface modification system of γ-aminopropyltriethoxysilane/cetyltrimethylammonium bromide(KH550/CTAB)was adopted to modify glass fibers(GF).An environmentally friendly ammonium polyphosphate/pentaerythritol(APP/PER)flame-retardant system was employed to replace the conventional halogen-antimony flame-retardant system.Modified glass fibers(CK-GF)reinforced flame-retardant poly(ethylene terephthalate)(PET)composites were prepared via melt blending and injection molding.The effects of GF and CK-GF content on the overall performance of the composites were investigated.The results showed that the KH550/CTAB combined modification constructed an active interfacial layer on the GF surface,significantly improving the surface roughness and wettability of GF,and effectively enhancing the interfacial compatibility between GF and the PET matrix.The CK-GF content played a key role in regulating the mechanical properties,thermal insulation performance,and flame retardancy of the composites.At a CK-GF mass fraction of 15%,the composites exhibited optimal overall performance,with a tensile strength of 82.3 MPa,a notched impact strength of 11.2 kJ/m2,and an elongation at break of 4.8%,meeting the toughness requirements for lightweight building components.The composites exhibited a low thermal conductivity of 0.151 W/(m·K),demonstrating superior thermal insulation performance.The limit oxygen index reached 33.8%,and the UL-94 rating reached V-0,complying with flame-retardant standards for building materials.The composites integrated mechanical load-bearing capacity,thermal insulation,and fire safety,making them suitable for green building envelope structures.