Kinetics of Chain Polymerization Initiated by a Free Radical Initiator MCQ

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• Which order kinetics does the rate of polymer formation, in free radical polymerization, follow corresponding to monomer concentration?
  ক

  1

  খ

  0

  গ

  2

  ঘ

  3
• How does polymerization rate at a given monomer concentration vary, if rate of chain initiation is tripled?
  ক

  doubled

  খ

  tripled

  গ

  increment by factor of 30.5

  ঘ

  remains constant
• Consider following data for bulk polymerization, with benzoyl peroxide as initiator. = 6 mol/m3 = 6.56*103 mol/m3 kp2/kt = 1.5*10-6 m3/ mol-s What is the initiator efficiency if initial rate of polymerization is 0.0256 m3/ mol-s benzoyl peroxide decomposes at a rate of 3.2* 10-6 m3/ mol-s-1?
  ক

  = 6 mol/m3 = 6.56*103 mol/m3 kp2/kt = 1.5*10-6 m3/ mol-s What is the initiator efficiency if initial rate of polymerization is 0.0256 m3/ mol-s benzoyl peroxide decomposes at a rate of 3.2* 10-6 m3/ mol-s-1? ] 0.7

  খ

  I

  গ

  I

  ঘ

  I
• What is the expression for rate of termination reaction of free radical polymerization? 2 b) 2kt2 c) 2fkt  d) fkt 
  ক

  kt2

  খ

  M∙

  গ

  M∙

  ঘ

  M∙
• What is the rate chain initiation reaction for initiator efficiency of 0.8, when concentration and decomposition rate of benzoyl peroxide are 4 mol/m3 and 3.24*10-6 m3/ mol-s-1, respectively?
  ক

  2.07*10-5

  খ

  1.57*10-5

  গ

  3.27*10-5

  ঘ

  1.03*10-5
• The data for bulk chain polymerization having potassium persulfate as initiator is given- = 5 mol/m3 = 5.3*103 mol/m3 kp2/kt = 0.85*10-6 m3/ mol-s What is the initial rate of polymerization, if potassium persulfate decomposes at a rate of 2.2*10-6 m3 s/ mol?
  ক

  = 5 mol/m3 = 5.3*103 mol/m3 kp2/kt = 0.85*10-6 m3/ mol-s What is the initial rate of polymerization, if potassium persulfate decomposes at a rate of 2.2*10-6 m3 s/ mol? ] 0.012

  খ

  I

  গ

  I

  ঘ

  I
• What is the expression for the rate of chain initiation of free radical chain growth polymerization?   b) 2fkd  c) kd/2  d) kd 
  ক

  fkd 

  খ

  I

  গ

  I

  ঘ

  I
• What is the initiator efficiency in chain initiation step of free radical polymerization?
  ক

  fraction of unreacted monomers

  খ

  extent of reaction

  গ

  fraction of radicals actually contributing

  ঘ

  number of initiator molecules
• How many initiator fragments are present in the dead polymer formed by combination mode of chain termination?
  ক

  2

  খ

  1

  গ

  3

  ঘ

  0