Subject Code & Name: PT25402 – Polymer Rheology
Regulation: R-2025
Semester: IV (Fourth Semester)
Branch: B.Tech. Plastics Technology (Plastics)
Credits / L-T-P: 3 Credits | L-T-P: 3-0-0
Course Objectives
- To analyze the flow behavior of polymer melts To understand the basics of fluid mechanism and to analyze behavior of Newtonian fluids.
- To familiarize with instruments such as orifice meter, Venturi meter and Pitot tube.
Full Unit-wise Syllabus
Unit I – Fluid properties
Units and dimensions-Properties of fluids-mass density, specific weight, specific volume, specific gravity, viscosity, surface tension and capillarity- Terminologies of fluid flow Laminar and turbulent flow of Newtonian fluids-Power law- Reynolds number and its significance.
Activities: Study of Reynolds number and classification of flow regimes (laminar, transition, turbulent).
Unit II – Fluid friction and flow measurement
Bernoulli ‘s equation–kinetic energy correction factor; head loss; friction factor; major and Minor losses- Flow measurement: Introduction; Orifice meter; Venturi meter; concept of area meters: rotameter; Local velocity measurement: Pitot tube.
Activities: Study of Venturimeter and comparison with orifice meter.
Unit III – Polymer rheology
Introduction and Basic concepts of Rheology, classification of fluids, Newtonian and non-Newtonian fluids, shear stress, shear strain and shear rate, shear modulus, bulk modulus, Zero shear viscosity, Dependence of viscosity with temp, shear stress , Viscoelasticity -effect of rate of strain, temperature and time on mechanical behaviour of polymeric materials.
Activities: Study of viscosity variation with temperature from real world application.
Unit IV – Rheological models
Mechanical models - stress strain response of spring and dashpot - visco elastic models -Maxwell element - Voigt kelvin element - response to creep and stress relaxation -four parameter model - Boltzman principle - time temperature super position principle – WLF equation.
Activities: Study of mechanical models of rheology using spring and dashpot analogies.
Unit V – Measurement of polymer melt viscosity
Viscosity of polymer melts – dieswell and melt fracture - Weissenberg effect – Elongational viscosity. Measurements of rheological properties - capillary rheometers – cone and plate viscometer - Oscillating disc rheometer - Mooney viscometer.
Activities: Study of Mooney viscometer and its use in polymer characterization.
Course Outcomes (COs)
- CO1: Understand the fundamental concepts of rheology, fluid properties, and flow behavior of polymeric materials.
- CO2: Apply rheological principles to determine and interpret the mechanical behavior of polymers under different loading conditions.
- CO3: Analyze rheological properties of polymers using appropriate experimental techniques and testing instruments.
- CO4: Evaluate the flow behavior of Newtonian and non-Newtonian fluids using principles of fluid mechanics and rheological models.
- CO5: Select and assess suitable flow measurement devices such as orifice meters, venturi meters, and pitot tubes for engineering applications involving fluid flow systems.
Assessment Pattern (Quick Note)
- Weightage: Continuous Assessment 40% | End Semester Examinations 60%
- Internal methodology: Assessment I (35%), Assessment II (35%), Activities (30%)
Source: Official Anna University – B.Tech. Plastics Technology R-2025 Syllabus
Last Updated: October 2026
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