List and explain 4 properties of plastics.
Answers
Answer:read the following;
Explanation:
1. STRENGTH
The plastics are sufficiently strong and can be used for load bearing structural members. The strength of plastics can further be increased by reinforcing them with various fibrous materials.
Plastic as structural material has not gained much popularity because of the following resins.
High cost of construction
High temperature susceptibility
Poor stiffness
Being subjected to creep under constant load
2. WEATHER RESISTANCE
The plastics, prepared from phenolic resins, are only good in resisting weather effects. Certain plastics are seriously affected by ultraviolet light.
3. FIRE RESISTANCE
Plastics, being organic in nature, are combustible. But the resistance to fire temperatue depends upon the plastic structure.
Cellulose acetale plastics burn slowly.
Polyvinyl chloride (PVC) plastics are non-inflammable.
Phenol formaldehyde and urea formaldehyde plastics are used as fire proofing materials.
4. DURABILITY
Plastics generally possess sufficient durability, provided they offer sufficient surface hardness. Thermoplastic varieties are found to be attacked by termites and rodents.
Explanation:
Plastic materials include polypropylene (PP), polystyrene (PS), high impact polystyrene (HIPS), acrylonitrile butadiene styrene (ABS), polyethylene terephthalate (PET), polyester (PES), polyamides (PA) (Nylons), poly(vinyl chloride) (PVC), polyurethane (PU), polycarbonate (PC), and polyethylene (PE).
The name Plastic is derived from the Greek word plastikos, which means able to be shaped. Plastic materials consist of long chain molecules (polymers). Available in many colors and in transparent form, plastics can be rubbery or rigid. Plastic shapes include sheet, rod, hex, pipe, cubes, balls, and tubes.