Identify A, B and C in the following stress- strain plot of a polymer.
The given stress-strain graph of a polymer indicates the different regions corresponding to its mechanical behavior under applied stress.
A: Elastic region (where the material undergoes reversible deformation). B: Yield point (where the material transitions from elastic to plastic behavior). C: Plastic region (where permanent deformation occurs).
The degree of polymerization at t = 10h of a polymer formed by a stepwise process with polymerization rate constant of and an initial monomer concentration of 50 mM is
The y-intercept obtained from the plot of viscosity of a series of polymer solutions against the concentration is 0.05. The proportionality constant K and exponent a for this polymer – solvent pair are 5×10-5 and 0.5, respectively. The molar mass of the polymer in g mol-1 is
A sample of polystyrene is composed of three weight fractions: 0.20, 0.50 and 0.30. The molecular weight of these fractions are 10,000, 40,000 and 60,000, respectively. The weight average molecular weight of this sample is:
In the process of polyesterification, the average length of polymer formed by a stepwise process grows linearly with time. The fraction condensed (extent of reaction) and the degree of polymerization at time t=1 hour, of a polymer formed with and initial monomer concentration of are respectively
A particular sample of polymer has 100 chains with molecular weight 1000, 200 chains with molecular weight 10000, and 200 chains with molecular weight 100000. The polydispersity of the sample is
Identify A, B and C in the following stress- strain plot of a polymer.
For step-wise polymerization, the correct plot of chain length
against degree of polymerization
is
The number-average degree of polymerization
of self-catalyzed polyesterification, a 3rd order reaction, is expressed as [[M]₀: initial monomer concentration]
The degree of polymerization at t = 10h of a polymer formed by a stepwise process with polymerization rate constant of and an initial monomer concentration of 50 mM is
The y-intercept obtained from the plot of viscosity of a series of polymer solutions against the concentration is 0.05. The proportionality constant K and exponent a for this polymer – solvent pair are 5×10-5 and 0.5, respectively. The molar mass of the polymer in g mol-1 is
