Unit 1 Introduction to Fibre Structure

14 lecture hours

• Investigation methods of fibre structure and their limitations
• Microscopic methods: Electron microscope(SEM
• X-ray diffraction methods (WAXS
• Optical birefringence
• Infrared spectroscopy(FTIR)
• Density measurements
• Nuclear magnetic resonance
• The general problem of fibre structure
• Fine and morphological structure of: natural-cellulose fibres
• regenerated and modified celluloses
• protein fibres
• synthetic fibres

Unit 2 Moisture Absorption Properties

9 lecture hours

• Definitions of humidity
• moisture regain
• moisture content
• Measurement of regain
• Relation between regain and relative humidity
• Effect of stress and temperature on regain
• Heat of sorption
• Swelling of fibres

Unit 3 Tensile Properties

8 lecture hours

• 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
• The study of time dependence
• Definitions of torsional rigidity and flexural rigidity

Unit 4 Optical and Frictional Properties

• Definitions of refractive index
• birefringence & orientation
• Reflection and luster
• Fibre friction
• Theories of friction – Amonton’s law
• Measurement of friction and 6 Subject Code: 3142904 w.e.f
• AY 2018-19 factors influencing fibre friction
• Friction in wool

Unit 5 Electrical and Thermal Properties

5 lecture hours

• Definitions of dielectric properties
• Definitions of electrical resistance
• Measurement of electrical resistance of fibres
• Thermal parameters(specific heat of fibres
• thermal conductivity
• expansion and contraction)
• Irreversible shrinkage
• Thermal transitions
• The secondary transitions in fibres
• Melting and multiple melting phenomena