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PROCESSING OF POLYMER MATERIALS

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Versione italiana
Academic year
2019/2020
Teacher
MARCO SCOPONI
Credits
6
Didactic period
Secondo Periodo Didattico
SSD
ING-IND/22

Training objectives

The purpose of the course is the learning of specific knowledge of the thermo-mechanical behavior of polymer materials both the solid state and in the molten state of homopolymers, copolymers and thermosets. The theoretical skills acquired during the course are on : i) the knowledge of the solid state behavior of thermosets, semicrystalline and amorphous polymer materials, ii)the experimental methodologies for the determination of thermal transitions, iii) the experimental methods for the determination of the tensile, flexural, impact resistance mechanical and the dimensional stability with temperature properties, iv) the experimental methods to determine the behavior in the molten state under tangential and elongational mechanical stresses and v) the processing technologies of industrial polymers with e single and twin screw extruders.

Prerequisites

Fundamentals of thermal and viscoelastic properties of the polymers is recommended to attend this course.

Course programme

-Brief introduction to the chemistry of homopolymers and copolymers. Thermal properties of polymers and thermal transitions. Thermo-mechanical behavior of thermosets, amorphous and semi-crystalline polymers. Experimental determination of thermal transitions by using differential scanning calorimeter (DSC).
-Thermosets: thermo-mechanical behavior, heat treatment and crosslinking reactions, kinetics of cross-linking with DSC. processing technologies: rolling, BMC and SMC.
-Thermoplastic and crosslinked elastomers: thermo-mechanical behavior: Gaussian model and Mooney Rivlin equation. Experimental methods for the crosslinking reactions of industrial elastomers.
-Viscoelastic behavior in the solid and molten state: creep, stress relaxation, time temperature equivalence principle and dynamic mechanical tests. Determination of the thermo-mechanical testing by tensile, bending, dimensional stability with temperature (HDT & VICAT) and impact resistance (Izod & Charpy) methods. Some examples with ISO and ASTM.
-Rheological properties of polymer fluids: flow curves with rotational and capillary rheometers. Description of the behavior of non-Newtonian fluids. Determination of fluidity index (MFR) with ISO and ASTM methods.
-Technologies for mixing of polymers: description of mono- and twin-screw extruders. Flow rate as a function of the geometry of the die and screws in single screw extruder. Determination of the operating conditions for the single-screw extruder.
-Processing technologies of polymer materials: Injection molding, Blow molding for production of bottles, Blow Molding for film production, Extrusion blow molding, thermoforming and rotational molding.

Didactic methods

Lessons on fundamental of thermomechanical behaviour of polymers, elastomers and thermosets. Practical exercises by using rheological, thermo-mechanical testing methods of industrial polymers.

Learning assessment procedures

The achieved level for learning the course objectives can be tested with an oral examination, with a max duration of 1 hour, which consists with the discussion of three main topics and of some examples and exercises proposed by the teacher during the course.

Reference texts

a) M. Guaita, F. Ciardelli, F.P. La Mantia, E. Pedemonte "Fondamenti di Scienza dei Polimeri" Pacini, 1998.
b) N.G. McCrum, C.P. Buckely, C.B. Bucknall "Principles of Polymer Engineering", Oxford Sci. Publ. 1999.
c) Dispense del docente.