Fiber Physics (2142904)   Old Code : 142802


Sr. Topics Teaching Hours Module Weightage
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

22 %
Moisture Absorption Properties

Definitions of humidity; moisture regain and moisture content; Relation between regain and relative humidity; Effect of stress and temperature on regain; Heat of sorption; Swelling of fibres; Quantitative theory of moisture absorption.

22 %
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

22 %
Optical and Frictional Properties

Refractive index of fibres; Measurement and factors influencing the results; Birefringence and optical orientation factor; Reflection of light; Lustre index; factors influencing lustre; Absorption of light –
dichroism, dichroic ratio; Fibre friction; Theories of friction – Amonton’s law; Bowden’s adhesion shearing mechanism; Lincoln’s law; Measurement of friction and factors influencing fibre friction; Friction in wool; theory of directional frictional effect; Significance of friction coefficient

20 %
Electrical and Thermal Properties

Conduction; dissociation of ion pairs; Measurement of electrical resistance of fibres; Dielectric properties; Static electricity – Thermal properties – Structural changes in fibres on heating; Thermal transitions; Heat setting; Thermal decomposition of fibres: Thermo gravimetric analysis and interpretation of results; Typical TGA graph of cotton and viscose

14 %