Difine Elastomers and Thermoplastic. Give example
Answers
Answer:
Polyolefin thermoplastic elastomer (TPO) materials are defined as compounds (mixtures) of various polyolefin polymers, semicrystalline thermoplastics, and amorphous elastomers. Most TPOs are composed of polypropylene (PP) and a copolymer of ethylene and propylene called ethylene–propylene rubber.
Explanation:
plz follow me
Answer:
Elastomers
Elastomers are polymers that are having a viscosity as well as elasticity and therefore are known as viscoelasticity. The molecules of elastomers held together by weak intermolecular forces, generally they exhibit low Young’s modulus and high yield strength or high failure strain. They inherit the unique property of regaining original shape and size after being stretched to a great extent.
Example:
Natural rubber: These are used in the automotive industry and in the manufacture of medical tubes, balloons, adhesives.
Polyurethanes: These are used in the textile industry for manufacturing elastic clothing like lycra.
Polybutadiene: These are used for providing wear resistance in wheels of vehicles.
Silicone: These are used in the manufacture of medical prostheses, lubricants as they have an excellent chemical and thermal resistance.
Neoprene: These are used in the manufacture of wet-suits and in industrial belts.
Thermoplastic
A thermoplastic, or thermosoftening plastic, is a plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.
Most thermoplastics have a high molecular weight. The polymer chains associate by intermolecular forces, which weaken rapidly with increased temperature, yielding a viscous liquid. In this state, thermoplastics may be reshaped and are typically used to produce parts by various polymer processing techniques such as injection molding, compression molding, calendering, and extrusion.Thermoplastics differ from thermosetting polymers (or "thermosets"), which form irreversible chemical bonds during the curing process. Thermosets do not melt when heated, but typically decompose and do not reform upon cooling.
Example:
- Acrylonitrile butadiene styrene (ABS) is a thermoplastic used to manufacture:
Sports equipment.
Toys (for example LEGO® blocks).
Various automobile parts
- Polycarbonate is used to make:
CDs and DVDs.
Drinking bottles
Food storage containers
Eyeglass lenses.
- Polyethylene is probably the most common thermoplastic and is used to make:
Shampoo bottles.
Plastic grocery bags.
Bullet-proof vests.