Qualitatively sketch the molecular weight distribution of a
polymer with PDI = 2 and of a polymer
with PDI = 12.
Qualitatively sketch the molecular weight distribution of a polymer with PDI = 2 and of a...
Molecular weight data for some polymer are tabulated.
Determine:
a) The number-average molecular weight
b) The weight-average molecular weight
c) What is the number-average degree of polymerization for this
polymer?
d) What is the weight-average degree of polymerization for this
polymer?
Side note: Please
consider the monomer C3H6
Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
1 Polymer Structure (4 pts) Sketch the repeat unit and determine the repeat unit molecular weight for the following polymers: a. polystyrene b. polytetrafluoroethylene c. polydimethylsiloxane d. nylon 6,10
Molecular Weight Why is the Mw of a polymer always larger than the Mn of the 2. same polymer sample 3. What is Poly Dispersity (PD) What is the Degree of Polymerisation (DP) 4.
Molecular Weight Why is the Mw of a polymer always larger than the Mn of the 2. same polymer sample 3. What is Poly Dispersity (PD) What is the Degree of Polymerisation (DP) 4.
1. A set of narrow molecular weight polymer standards for a polymer, X, was synthesized Polydispersities were less than 1.01. Intrinsic viscosities were determined for solvent Y at 30°C. The data is shown below. Determine the Mark-Houwink-Sakurada parameters for polymer for solvent Y at 30°C. Molecular weight grams/mole 46,000 82,000 152,000 253,000 348,000 856.000 0.258 0.408 0.663 0.893 1.226 2.210
7. Please calculate the number-averaged molecular weight and weight-averaged molecular weight for the following polymer. (6 pt) Fraction Mass(g) Mx 104(g/mol)1.24 1.521.361.282.301.504.28 1.21 1181.4567 0.23 0.18 0.56 0.82 3.76 8. A student mixed two batches of PS accidently in the lab, what would be number-averaged molecular weight and weight-averaged molecular weight for this PS mixture. (6 pt) Batch Mass(g) Mw (g/mol) Mn (g/mol 15 75,000 50,000 150,000 120,000
b) Explain why the molecular weight of a polymer can change the mechanical strength of a polymer.
What is the molecular weight of the polymer prepared by the self condensation of HO‐C6H5‐COOH, if 99.5% of the functional groups react
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
1) (25 points) The molecular weight of a polymer can be determined from its viscosity by the following relationship where [n] is the intrinsic viscosity of the polymer M, is the viscosity averaged molecular weight, and K and a are constants specific for the polymer. The intrinsic viscosity is determined experimentally be determining the efflux time, or the time it takes for the polymer solution to flow between two etched lines in a capillary viscometer, at several different concentrations of...
Polymer Science ---help
A 50-g polymer sample was fractionated into six samples of different weights given in the table below. The viscosity-average molecular weight, bar M_v, of each was determined and is included in the table. Estimate the number-average and weight-average molecular weights of the original sample. For these calculations, assume that the molecular-weight distribution of each fraction is extremely narrow and can be considered to be monodisperse. Would you classify the molecular-weight distribution of the original sample as narrow...