functionality of monomer,average no. molecular weight polymer,tg ( glass transition temperature)

Functionality of monomer ,average no. molecular weight polymer,Tg( glass transition temperature)

`The examples of natural polymers are

• Wood• rock• bones • all of these

Which of the following is not a tetra functional

• sorbitol • acetylene • butadiene • glycerol

Which of the following can be used as a monomer benzoic acid acetic acid

adipic acid ethanoic acid 1 C

• benzoic acid • acetic acid • adipic acid • ethanoic acid

Match the following 1) Natural

polymer A) building blocks of polymer

2) Monomer B) linear polymer and sometime

branched polymer3) Bifunctional C)Phenol

4) Trifunctional D)Wood 1 - D, 2 -

• A, 3 - B, 4 - C 1 - D,• 2 -B, 3 - A, 4 - C 1 - D,• 2 -A, 3 - C, 4 - B 1 - D, • 2 -C, 3 - A, 4 - B 2 A

The ---------- is the vinylic monomer and -------- is functional group

• monomer glycol & ethylene diamine• vinyl chloride & styrene • propylene & adipic acid • benzene & terphthalic acid

Which of the following is trifunctional monomer

• Formaldehyde• Phenol• Vinyl chloride• Ethylene glycol

Which of the following can be used as monomer in chain polymerisation

• Ethyl chloride • Hydrochloric acid• Bisphenol-A• Vinyl chloride

Which of the following initiator can be used in free radical polymerization

• H2O2

• BF3

• H2SO4

• C2H5Na

The correct formula for Number Average Molecular weight of polymer is

• ƩNiMi2/ƩniMi • ƩniMi/Ʃni • ƩniMi/ƩMi • none

Molecular weight of polymer (M), monomer (Mo) and degree of polymeristion (n) are related by

• Mo = M + n• M = Mo – n• M = Mo x n• Mo = M x n

Choose the correct option giving features of addition polymerization

1) monomer contains double bond or triple bond 2)

initiator is not require to start polymerization 3) reaction is exothermic and fast.

4) polymer is exact multiple of monomer 5) by-products are formed

6) linear or branch polymer with live ends

• 2, 3, 4 • 1, 3, 4 • 3, 5, 6• 3, 4, 6

Choose the correct option giving feature of condensation polymerisation

1Reaction is exothermic &fast2initiator is not required to stop polymerisation reaction

3 monomer contain functional group4 polymer is exact multiple of monomer

5 byproduct are formed6linear or branched polymer with live ends is formed

• 2,3,4• 1,3,4• 3,5,6• 3,4,6

A monomer of molecular weight 42 forms the polymer of average

molecular weight 12600; the degree of polymerization of the polymer is

• 100 • 200• 300 • 400

Molecular weight of a polymer is equal to

• Dp x moles of monomer • Dp x Equivalent weight of monomer • Dc x Equivalent weight of monomer • Dp x molecular weight of monomer

Dp of polymer is ---------

• No. of monomers in polymer chain• No. of reaction sites in monomer • No. of ways polymerization is carried out • None of these

Which of the following polymer is example of condensation polymer

• Nylon • Polythene • PVC• Polypropylene

Condensation polymerization reaction is associateed with

• Elimination of water • Elimination of methyl alcohol • Both (a) and (b)• None of these

The correct order of steps in the mechanism of chain

polymerization is

• propogation -initiation - termination • dispropersation -initiation- propogation • initiation -propogation- termination • initiation termination- propogation

Plasticizer added during compounding of plastic

• Decreases plasticity and increases flexibilty • Increases plasticity and increases flexibilty • Decreases plasticity and decreases flexibilty • Increases plasticity and decreases flexibilty

Glass transistion temperature is affected by

• molecular weight • crystallinity • cross linking of polymer • all of these

Polymer used in cold countries should have

• lower Tg• higher Tg • Tg = 0• none of these

Polystyrene has more Tg than polyethylene due to

• Presence of double bond• Absence of functional group• Presence of bulky side group• Absence of polarity

Weight average molecular weight of polymer is determined by using techniques that are dependant on

• Physical properties• Size of molecule • Osmotic pressure• Number of particale in given volume

Match the following

1 Aromatic rings P Vegetable oil

2 Plasticizer Q Cellulose3 Organic stabilizer R High thermal and fire resistance4 Coiled polymer s SBR

Choose the correct option that is true for fillers used in compounding of plastics1.imparts hardness tensile strength, opacity and workability

2.Increases cost3.Amount of filler added varies upto80%

4.Extra hardness imparted by carborundum,quartz,mica to the final plastic5.some examples are wood flour,talc,saw dust,papers pulp

• A)1 ,2,5 • b)1,4,5• C)3,4,5 d)1,3,4

Choose the correct option giving the application of SBR1Manufacture of vehicle tyres

2.Used in making of floor tiles,shoe sole,gasket3.used in making conveyor belt

4.used to manufacture panels and wings for fighter jets5.used as adhesive

• A)1,2,3• B)2,3,4• C)1,2,4• D)1,2,5

The weight percentage of butadiene in SBR is

• A)25%• B)75%• C)50%• D)None of these

Natural rubber can be used to prepare

• A)Golf ball covers • B)Submarine cables • C)Both a)and b) • D)none of these

Epoxy resin is used for

• A)Surface coating• B)Skid resistant surface for industrial flooring• C)impregnation on fabric for crease resistant• D)all of these

Natural rubber is

• A)Cis 1,4-poly isoprene• B)Trans 1,4-poly isoprene• C) Cis 1,2-poly isoprene• D) Trans 1,2-poly isoprene