Lecture

Rubber Elasticity: Theory and Applications

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

In course

MSE-431: Physical chemistry of polymeric materials

The student has a basic understanding of the physical and physicochemical principles which result from the chainlike structure of synthetic macromolecules. The student can predict major characteristics of a polymer from its chemical structure and molecular ...

Description

This lecture delves into the theory of rubber elasticity, focusing on the entropy-driven behavior of rubber materials. Topics covered include the theory of rubber elasticity, the equation of state for elastomers, thermodynamics of elasticity, and the relationship between entropy and retractive force. The lecture also explores the swelling of polymer networks, the modulus of macroscopic networks, and the stress-strain behavior of rubber materials. Additionally, it discusses thermoplastic elastomers, such as styrene-isoprene-styrene and styrene-1,2-butadiene-styrene copolymers, and their applications in thermoplastic elastomers. The molecular basis of rubber elasticity and the behavior of networks or gels absorbing solvent are also examined.

Official source

Ontological neighbourhood

Chemistry

Organic chemistry: Polymer chemistry

Chemical engineering

Materials science: Deformation of materials

Physics

Thermodynamics: Statistical mechanics

Related concepts (32)

Rubber elasticity

Rubber elasticity refers to a property of crosslinked rubber: it can be stretched by up to a factor of 10 from its original length and, when released, returns very nearly to its original length. This can be repeated many times with no apparent degradation to the rubber. Rubber is a member of a larger class of materials called elastomers and it is difficult to overestimate their economic and technological importance. Elastomers have played a key role in the development of new technologies in the 20th century and make a substantial contribution to the global economy.

Elastomer

An elastomer is a polymer with viscoelasticity (i.e. both viscosity and elasticity) and with weak intermolecular forces, generally low Young's modulus (E) and high failure strain compared with other materials. The term, a portmanteau of elastic polymer, is often used interchangeably with rubber, although the latter is preferred when referring to vulcanisates. Each of the monomers which link to form the polymer is usually a compound of several elements among carbon, hydrogen, oxygen and silicon.

Natural rubber

Rubber, also called India rubber, latex, Amazonian rubber, caucho, or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Thailand, Malaysia, Indonesia, and Cambodia are four of the leading rubber producers. Types of polyisoprene that are used as natural rubbers are classified as elastomers. Currently, rubber is harvested mainly in the form of the latex from the rubber tree (Hevea brasiliensis) or others.

Thermoplastic elastomer

Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) that consist of materials with both thermoplastic and elastomeric properties. While most elastomers are thermosets, thermoplastics are in contrast relatively easy to use in manufacturing, for example, by injection moulding. Thermoplastic elastomers show advantages typical of both rubbery materials and plastic materials.

Elasticity (physics)

In physics and materials science, elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is removed. Solid objects will deform when adequate loads are applied to them; if the material is elastic, the object will return to its initial shape and size after removal. This is in contrast to plasticity, in which the object fails to do so and instead remains in its deformed state. The physical reasons for elastic behavior can be quite different for different materials.

Related lectures (64)

Rubber Elasticity: Theory and Applications

Explores the theory of rubber elasticity, synthetic rubber types, and crosslinking strategies.

Polymers: Structure and Properties

Explores the classification, molecular structures, mechanical behavior, and viscoelastic properties of polymers, emphasizing temperature effects and material responses.

Crystallization and Rubber Elasticity

Explores crystallization kinetics, rubber elasticity, and network formation through crosslinking and entropy-driven processes.

Polymer Physics: Ideal Chains

Explores ideal chains in polymer physics, discussing conformation, random walks, entropy, and the Schrodinger equation.

Polymer Structure and Mechanical Behavior