Module 1 Flashcards
What is a composite material?
A composite material is a material that is made up of two or more constituent materials with significantly different physical or chemical properties. AND when combined, produce a material with characteristics different from the original individual components.
The difference between thermoset and thermoplastic polymer
thermoplastics can be re-softened by applying heat and have simple addition structures. thermoset cannot be re-softened by heating and unlike thermoplastics, thermosets often have a stronger network structure.
Composite materials are classified based on:
(a) Type of matrix
(b) Size-and-shape of reinforcement
(c) Both a and b
(d) None
Answer is C
Al-alloys for engine/automobile parts are reinforced to increase their (a) Strength (b) Wear resistance (c) Elastic modulus (d) Density
Answer is B
Mechanical properties of fibre-reinforced composites depend on
(a) Properties of constituents
(b) Interface strength
(c) Fibre length, orientation, and volume fraction
(d) All the above
Answer is D
name three thermoplastic polymers
nylon, polycarbonate, polyethylene, arcylic ,polypropylene, teflon, PVC
would a car contain any composite materials?
yes, it would contain composite materials such as carbon fiber and even fiberglass, the composite material is also used to make the car lighter and stronger.
what words does polymer come from
poly: meaning many , mer: meaning the smallest repeating unit f the polymer material.
what is addition polymerisation
2 or more monomers which are the same connect to form the polymer
what are polymers
polymers are solid materials made of long molecular chains that are created by connecting small molecules.
polymer formation falls under which two catergories
thermoplastics, thermosets
which has stronger covalent bonds; thermosets or thermoplastics
thermosets
how are polymers formed
polymers are formed by linking smaller molecules known as monomers.
what words does monomers come from
mono=one, mer=part
what is a monomer
a molecule that can be boned to other identical molecules to form a polymer.
Why do we use composites?
We use composites because it combines the strength of the materials and it is lighter.
Name three different examples of synthetic polymers?
Plastic containers, Plastic bottles, and non-stick frypan.
Name three different examples natural polymers?
DNA, Silk, and Wool
