Answer:

PMMA

It is prepared by polymerization of methyl-methacrylate which is an ester of methyl acrylic acid CH2 = C(CH3)-COOH in the presence of actyl peroxide. It is an acrylic polymer.

Properties and uses:

• Colorless, hard, thermoplastic and fairly rigid material.
• High softening temperature 130-140o C, becomes rubbery above 65oC.
• High optical transparency.
• Has refractive index = 1.59.
• Its drawbacks- low resistance to hot acids and alkalis & to scratches.
• Used for protective coating and also for manufacturing safety glass.

• Acrylic resin emulsion are used as textile and leather finish. Making lenses, artificial eyes, wind screens, TV screens etc.

   

Silicon Rubber

Preparation: Silicon rubbers are produced by pooymerization of dimethylsilicon hydroxide.

Properties and Uses:

• Silicon rubbers have a quite different type of polymer struture from any of the synthetic rubbers as in the case of silicon rubbers,the chain structure does not involve a long chain of carbon atoms,but a sequence of silicon and oxygen atoms.

   

BUNA-S

Preparation: butadiene (about 75% by weight) and styrene (25% by weight) co-polymerize to give styrene butadiene rubber (SBR) 

The products formed by copolymerization show the specific properties of the monomers and hence is very useful in industry. Butadiene and styrene are called as primary monomer. This is nothing but a type of addition polymerization commonly known as co-polymerisation.

Properties and uses:

• High abrasion resistance, high bearing capacity and resilience.
• Gets oxidized in the presence of traces of ozone. Swells in oils and solvents.
• Used for manufacture of car tyres, floor tiles, shoe soles, adhesives, and wire & cable insulations.