The selection of a solvent or a solvent system is a fundamental and a crucial step in spinning fibres using a\nselected process. Solvent selection determines the critical minimum polymer concentration and the critical\nminimum chain entanglement which allows the spinning of nano fibres rather than other hybrid morphologies\nsuch as beaded structures. Pressurised gyration, which simultaneously combines the use of gas\npressure and rotation, is used as the processing and forming route for spinning fibres in this work. This\nstudy investigates 23 different solvents and solvent systems spread on a wide area of a Teas graph and\nable to dissolve the functional polymer polyethylene (terephthalate) (PET) and spin products by the\napplication of pressurised gyration. The results are mapped on a Teas graph to identify the solubilityââ?¬â??\nspinnability region. Based on this solubilityââ?¬â??spinnability region, various solvents and binary solvent systems\nthat allow the making of PET fibres are suggested. Scaling laws for the relationship between polymer\nconcentration and specific viscosity are identified. The structural evolution in the fibres prepared is\nelucidated. For the first time, a mathematical model to scale fibre diameter with respect to flow properties\nand processing parameters encountered in pressurised gyration has been successfully developed.
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