Modification of poly(ethylene terephthalate) fibre by polymer blending with poly(butylene terephthalate) fibre: Part VI-Annealing behaviour

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" new="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The improvement in the properties of blended fibres prepared from poly(ethylene terephthalate) and 0-10% poly(butylene terephthalate) during annealing is influenced by chain entanglement and extent of phase segregation. The structural properties like crystallinity, birefringence and amorphous orientation of 98/2 PET/PBT blend fibre show minimum change due to chain entanglement resulting in better mechanical properties, 94/6 PET/PBT fibre shows maximum change in structural properties owing to phase segregation during annealing. The mechanical properties of 92/8 PET/PBT blend fibres deteriorate after annealing as a result of two-phase structure leading to higher incompatibility.</span>