Modification of poly(ethylene terephthalate) fibre by polymer blending with poly(butylene terephthalate) fibre: Part V- Extrusion 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:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The properties of 94/6 PET/PBT blend can be improved by increasing the extrusion temperature from 275 to 285°C. At 285°C, the blend shows no transesterification and improves density, crystallinity and heat of fusion. However, the melt viscosity decreases and activation energy increases due to the plasticising action of PBT. On the other hand, at higher extrusion temperature, PET shows minimum degradation. Density, crystallinity and heat of fusion decrease due to the absence of crystal nuclei of PET. Owing to this, melt viscosity decreases and activation energy increases.</span>