Strengthening of polyethylene terephthalate fibres by intramolecular stabilization of the polymer

The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes: Part 1 fundamental aspects

“…It follows, therefore, that values of T g reported for PET fibres/polymers will vary according to the polymer/ fibre processing conditions utilised. In this context, it is well known that the T g of polyester fibres/polymers depends on the physical state of the material (eg, 293,297,298 ), for example, ranging from 67 C (amorphous) and 81 C (semi-crystalline) to 125 C (crystalline, oriented), 299 with reported values of the T g of PET fibres varying from $70 C up to $120 C (eg, 93,132,151,297,298,[300][301][302][303][304][305][306][307][308][309][310][311] ), a single value for polyester fibre T g commonly quoted being 80 C. 56,104,259,[301][302][303][304]312 In addition, because the methods available to determine polymer/fibre T g differ (see the subsection on Determination of T g ), so measured values of T g also differ depending on the method used to quantify the thermal transition (eg conditioned PET fibre T g , o C: DSC, 71; shrinkage, 73; modulus, 71; specific volume, 69 254 ). F I G U R E 1 2 T g of poly(ethylene terephthalate) filaments as a function of crystallinity; drawn using data from.…”

“…It follows, therefore, that values of T g reported for PET fibres/polymers will vary according to the polymer/fibre processing conditions utilised. In this context, it is well known that the T g of polyester fibres/polymers depends on the physical state of the material (eg, 293,297,298 ), for example, ranging from 67°C (amorphous) and 81°C (semi‐crystalline) to 125°C (crystalline, oriented), 299 with reported values of the T g of PET fibres varying from ~70°C up to ~120°C (eg, 93,132,151,297,298,300–311 ), a single value for polyester fibre T g commonly quoted being 80°C 56,104,259,301–304,312 …”