|
1
|
Introduction to Fibre Structure
Requirements for fibre forming polymers. Fine and morphological structure of Cotton – Flax – Jute – Silk –
Wool – Viscose – Polyester – Polyamide – Polyacrylonitrile – Polyolefins; Structural models and their limitations; Investigation methods of fibre structure and their limitations; Microscopic methods: SEM, TEM, AFM. X-ray diffraction methods (WAXS, SAXS); Spectroscopic methods: UV-vis; FTIR; Density measurements; sonic modulus
|
|
|
|
3
|
Tensile Properties
Definitions: breaking strength, breaking extension, tensile stress, tensile strain, mass specific stress, yield point, initial modulus, secant modulus, work of rupture and work factor; Stress-strain curves for various textile fibres and their significance.
Factors influencing tensile properties of fibres; Elastic properties; Methods of tensile testing – CRL / CRT/ CRE methods and their limitations; Mechanical conditioning of Fibres; Visco-elastic properties: Time effects – Dynamic mechanical analysis of fibres; Torsional and flexural rigidity – Measurement techniques; Stress-strain of an ideal fibre
|
|
|