Relationship between microstructure and properties of false-twist textured and stabilized polylactide. Part 2. physicochemical characterization, accessibility of the amorphous phase and dyeing behavior

• Published in: Textile research journal Vol. 83; no. 10; pp. 1065 - 1074
• Main Authors: Cayuela, Diana, Montero, Lucila, Riva, Ascension, Prieto, Remedios, Marti, Meritxell, Manich, Albert M
• Format: Journal Article Publication
• Language: English
• Published: London, England SAGE Publications 01-06-2013; Sage Publications Ltd
• Subjects: Accessibility; Biomaterials; Bonding levels; Color; Color differences; Correlation analysis; Crystal orientation; Crystallinity; Dyeing; Dyes; Enginyeria química; Enginyeria tèxtil; Fibres sintètiques; Fibres tèxtils; Fibres tèxtils sintètiques; Glass transition; Indústries químiques; Investigació; Iodine; Mechanical properties; Microstructure; Orientation; Physicochemical tests; Polyesters; Polylactide; Polylactides; Polymers; Química tèxtil; Solubility; Stabilization; Studies; Technological innovations; Textile fibers; Textile fibers, Synthetic; Textiles; Àrees temàtiques de la UPC; orientation; microstructure; color differences; Polylactide; physicochemical tests; crystallinity; bonding levels; glass transition; dyeing
• ISSN: 0040-5175; 1746-7748
• DOI: 10.1177/0040517512474361

Polylactide fibers (PLA), textured by false twist at different temperatures (135, 150 and 165℃) and draw ratios (1.30, 1.35 and 1.40) were stabilized by the application of a continuous thermal treatment at 100℃ and 50 m/min. The effect of thermal stabilization on the microstructure was determined by physicochemical tests such as iodine sorption or differential solubility. Iodine sorption and differential solubility are closely related to the crystallinity of the samples. Stabilization enhances crystallinity and orientation with the result that differences between the samples are diminished. Color value differences, albeit reduced, in some cases exceed the accepted limits. Color absorption is mainly dependent on the orientation and accessibility of the amorphous phase.