what are polymers?what are polymers?what are polymers?
Answers
Answer:
By definition, polymers are large molecules composed of long chains of repeated smaller molecules (monomers). Polymers can occur in nature (these are known as biopolymers) or be created in labs (synthetic polymers). Prized for their strength, durability, and elasticity, polymers have found uses in human life for thousands of years, starting with a simple rubber ball.
Explanation:
Properties of Polymers:-
Physical Properties
As chain length and cross-linking increases, the tensile strength of the polymer increases.
Polymers do not melt, they change state from crystalline to semi-crystalline.
Chemical Properties
Compared to conventional molecules with different side molecules, the polymer is enabled with hydrogen bonding and ionic bonding resulting in better cross-linking strength.
Dipole-dipole bonding side chains enable the polymer for high flexibility.
Polymers with Van der Waals forces linking chains are known to be weak, but give the polymer a low melting point.
Optical Properties
Due to their ability to change their refractive index with temperature as in the case of PMMA and HEMA: MMA, they are used in lasers for applications in spectroscopy and analytical applications.
Some Polymers and their Monomers
Polypropene, also known as polypropylene, is made up of monomer propene.
Polystyrene is an aromatic polymer, naturally transparent, made up of monomer styrene.
Polyvinyl chloride (PVC) is a plastic polymer made of monomer vinyl chloride.
The urea-formaldehyde resin is a non-transparent plastic obtained by heating formaldehyde and urea.
Glyptal is made up of monomers ethylene glycol and phthalic acid.
Bakelite or polyoxybenzylmethylenglycolanhydride is a plastic which is made up of monomers phenol and aldehyde.
Answer:
polymers are formed repeated polymerisation of an monomer
Explanation:
eg. ethene is converted into polythene after repeated polymerisation