____________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR?

Related Mcqs:

1. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?

   A. 1: 3
   B. 3 : 1
   C. 1 : 2
   D. 2 : 1

2. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________?

   A. 50°C and 3 – 4 kg/cm2
   B. 50°C and 1 kgf/cm2
   C. 250°C and 10 kgf/cm2
   D. 250°C and 1 kgf/cm2

3. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are__________________?

   A. 5°C and 1 kgf/cm2
   B. – 20°C and 1 kgf/cm2
   C. 0°C and 1 kgf/cm2
   D. 0°C and 3 kgf/cm2

4. Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?

   A. Poor tensile strength
   B. Poorer resistance
   C. Greater amount of heat build up heavy loading
   D. All A., B. and C.

5. Styrene butadiene rubber (SBR) is never used for making__________________?

   A. Coated fabrics
   B. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
   C. Gaskets
   D. Soles of shoes

6. Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation ?

   A. PVC
   B. Bakelite
   C. PTFE
   D. Epoxy resin

7. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styreneacrylonitrile copolymer with butadiene based elastomer, is a/an__________________?

   A. Rigid foam
   B. Engineering plastic
   C. Thermosetting polymer
   D. Spongy rubber

8. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is __________________?

   A. Nylon-66
   B. Teflon
   C. Polyester
   D. Bakelite

9. Styrene butadiene rubber is commercially manufactured by__________________?

   A. Bulk polymerisation
   B. Suspension polymerisation
   C. Solution polymerisation
   D. Emulsion polymerisation

10. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?

    A. 50000
    B. 51600
    C. 49200
    D. 50800