Recent questions tagged polymer

Description : What is PHBV? Give its one use.

Last Answer : Ans: It is a poly β hydroxybutyrate—co β hydroxyl valerate . It is obtain by the copolirisation of 3— hydroxyl butanoic acid and 3— hydroxy pentanoic acid.It is used in speciality packaging , orthopaedic devices. 

Description : Who do double bonds in rubber molecules influence there structure and reactivity.

Last Answer : Ans: Greater the number of double bound the rubber will be less reactive because of greater inter molecular forces of attraction among the monomers.

Description : What is Biodegradble polymer?

Last Answer : Ans: The polymers which are Biodegrable and not causes any environmental population is called Biodegrable . Eg. PHBV and Nylon 2 Nylon 6.

Description : Classify the polymers as addition and condensation polymer— Nylon 6, Neoprene and PVC.

Last Answer : Ans: Nylon 6 —Condensation polymer  Neoprene and PVC— Addition polymer.

Description : Clasify the polymers as addition and condenstation polymers. Nylon 66, Buna-S, Polythene.

Last Answer : Ans: Nylon 66 condensation polymer.  Buna-S and polythene—Addition polymer.

Description : Write the structure of monomer of polystyrene.

Last Answer : Ans: Styrene. Ar— CH=CH2 

Description : Arrange the following Polymers in increasing order of inter molecular forces Nylon 6, Neoprene and PVC

Last Answer : Ans : Nylon 6, PVC and. Neop 

Description : Arrange in increasing order of inter molecular forces. Nylon 66, Buna-S and polyethene.

Last Answer : Ans: Nylon 66 > polyethene> Buna-S 

Description : Name the monomer of polyvinylchloride.

Last Answer : Ans: Vinylcloride. 

Description : A polymer is used for making paints and lacquers, name it. 

Last Answer : Ans: Glyptal. 

Description : A polymer is use for making combs, name the polymer.

Last Answer : Ans : Baklite 

Description : What are carbon fiber? 

Last Answer : Ans: A long thread solid posses high tensile strength. Eg. Terrylen and Nylon

Description : Write the name of reagent use for initating a free radical chain reaction. 

Last Answer : Ans: Tertiary Butyle peroxaide. 

Description : Write the name of neoprene polymer? 

Last Answer : Ans: Chloroprene 

Description : What does stand for PDI

Last Answer : Ans: Polydispersity Index. 

Description : Arrange the following Polymers in increasing order of inter molecular forces. (a) Nylon 66, Buna-S and Polythene (b) Nylon 6, Neoprene and PVC

Last Answer : Ans: (a) Buna-S, Polythene and Nylon 66.  (b) Neoprene, PVC and Nylon 6.

Description : Explain the difference between Buna-N and Buna-S.

Last Answer : Ans: Buna-N:- 1. It is optained by the copolymerization of 1,3 - butadiene and acrylonitrile in the presence of a Peroxide Cxtalyst. 2. It is resistant to action of Petrol. 3. It is used ... 1. It is obtained by the Copolymerisation of buta diene and styrene. 2. It is used for automobile tyres.

Description : What is PHBV ?

Last Answer : Ans: It is a poly hydroxyl butyrate. Co-β- hydroxyl Valerate. It is copolymer of 3- hydroxyl butanoic acid and 3- hydroxyl pentanoic acid in which monomer units linked by ester linkage.

Description : Why are the numbers 6, 6 and 6 put in the name of Nylon 66 and Nylon 6?

Last Answer : Ans: Nylon 66 means that it is formed by two monomers each containing six carbon atoms. While in Nylon 6 means that it is formed by a monomer containing six carbon atoms.

Description : Distinguish between Homopolymers and Copolymers.

Last Answer : Homopolymers Copolymers 1. The polymers which are form by only one type of monomers Eg. Teflon & PVC 1. The polymers which are form by two or more types of monomers .Eg. Terrylene & Buna-S

Description : Distinguish between thermoplastic and thermo setting polymers.

Last Answer : Thermo plastic polymer Thermo setting plastic  1. The inter moliculer forces are intermediate.  1. The inter molecular force are ... 3. Eg. Polythene and polystyrene  3. Eg. Bakelite

Description : Differntiate between addition polymer and condensation polymer. 

Last Answer : Addition Polymer  Condensation Polymer 1. Large no. of unsaturated monomers combine together to form polymers Eg. Polythene and ... group with release of small molecule like water combine to form polymers. Eg. Nylon and Teflon

Description : What is meant by PTEE ? Give its popular name.

Last Answer : Ans: Polytetra fluoroethylene. Teflon. 

Description : Why should one always use purest monomer in free radical polymerization?

Last Answer : Ans: The impurities present in monomer may combine with free radical that slow the rate of polymerization.

Description : Define Copolymers?

Last Answer : Ans: The polymer is obtained by two or more different monomers.

Description : Write the polymer of Tetrafluoro ethane.

Last Answer : Ans: Teflon. 

Description : What is the monomer of Polyacrylonitrile?

Last Answer : Ans: Acrylonitrile 

Description : Write the name of monomers of Melamine-Formaldehyde.

Last Answer : Ans: Melamine and Formaldehyde. 

Description : Write the monomer of Neoprene?

Last Answer : Ans: Chloroprene. 

Description : Write the structure of monomer of Polystyrene? 

Last Answer : Ans: Ar CH = CH2 

Description : Write the monomer of Polystyrene? 

Last Answer : Ans: Styrene. 

Description : Explain the difference between Buna-N and Buna-S.

Last Answer : Ans: Buna-N:- 1. It is obtained by the copolymerization of 1,3 - butadiene and acrylonitrile in the presence of a Peroxide Catalyst. 2. It is resistant to action of Petrol. 3. It is used ... 1. It is obtained by the Copolymerisation of buta diene and styrene. 2. It is used for automobile tyres.

Description : Define Synthetic rubbers. Whether it is homopolymer or co-polymer?

Last Answer : Ans: Any Vuclanised rubbers like polymers. Which is getting stretched to about twice lengths and returns to the original shape and size as the external force is released. Eg. Homopolymers.

Description : What is Neoprene? Mention any two uses.

Last Answer : Ans: A synthetic rubber made by chloroprene. It is a synthetic rubbers. Uses: Conveyor belts in coal mines & gaskets.

Description : Define Copolymers.Give two examples.

Last Answer : Ans: The Polymer in which repeating units are combined with two or more differents types of monomers Eg. Polyster and terrylene(Dacron)

Description : What are elastomers ? Give one example.

Last Answer : Ans: The rubber like material which are elastic in nature. Eg. Natural rubber. 

Description : Differentiate between thermo plastic and thermo setting Plastic.

Last Answer : Thermo Plastic Polymer Thermo setting Polymer  1. Liner or slightly branched long change molecules 1. Cross linked or ... . Ex. Polythene, Polystyrene  3. Ex. Bakelite, Urea-Formal dehyde resins

Description : Give one example of each for low density polythene and high density polthene.

Last Answer : Ans: LDP. Squeze bottle and toys  HDP. Buckets, dustbin, bottles.

Description : What is addition polymerization ?

Last Answer : Ans: A chemical reaction in which monomer unit is repeated to produce a molecule without losing of molecule like water or ammonia. Ex. Polythene, Polyvinyl chloride

Description : What are carben fibers ? Give two examples.

Last Answer : Ans: A long thread solid posses high tensile strength. Eg. Terrylen and Nylon. 

Description : Write the Mnomers of Buna-s.

Last Answer : Ans. 1, 3 butadine and styrene 

Description : What are monomers of Nylon 6.6

Last Answer : Ans: (a) Hexamethylene diamine and adaipic acid. 

Description : What is Synthetic polymer ? Give one example.

Last Answer : Ans: Man made polymers are called Synthetic polymers. Polyethene, PVC. 

Description : Write the monomer of Glyptal polymer.

Last Answer : Ans: (a) Ethylene glycol (b) Phthalic acid 

Description : Write the polymer of phenol and formaldehyde that is used for making combs.

Last Answer : Ans: Bakelite, (a) Phenol (b) Formaldehyde 

Description : Write the monomer of Polyvinyl chloride.

Last Answer : Ans: Vinyl chloride. 

Description : Why should we always use purest monomer in free radical mechanism ? 

Last Answer : Ans. Monomer has to be as pure as possible because the presence of any other molecule during free radical polymerisation can act chain initiator or inhibitor which will interfere with the normal polymerisation reaction.

Description : Explain the difference between Buna— S and Buna — N.

Last Answer : Ans. Buna — N is a copolymer of 1, 3-butadiene and acrylo nitrile, Buna — S is a copolymer of 1, 3-butadiene and styrene.

Description : Arrange the following polymer in increasing order of their molecular forces : (a) nylon-6, 6, Buna-S, polythene. (b) nylon-6, Neoprene, polyvinyl chloride.

Last Answer : Ans. (a) Buna S < Polythene < Nylon-6, 6. (b) Neoprene < Polyvinyl Chloride < Nylon-6.

Description : Why are the No. of 6, 6 and 6 put in the names of nylon-6, 6 and nylon-6 ?

Last Answer : Ans. The no. of 6, 6 in nylon-6, 6 implies that both the monomers of nylon-6, 6 namely hexamethylene diamine and adipic acid contain six carbon atom each. The no. of 6 in nylon-6 contains six ... . The no. of 6 in nylon-6 indicates that its monomer Caprolectum has six carbon atom in its molecule.