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b) Explain why the molecular weight of a polymer can change the mechanical strength of a...
Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight b) The...
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...
Molecular Weight Why is the Mw of a polymer always larger than the Mn of the 2. same polymer sample 3. What is Poly Dis...
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.
In general, as the molecular weight of a sample increases, its strength properties such as Young's...
In general, as the molecular weight of a sample increases, its strength properties such as Young's modulus and tensile strength: A) There is no relationship between these properties B) Decrease C) Increase Save Question 33 (1 point) A polymer sample cooled slowly from 160°C to room temperature using natural convection is likely to be: A) 100% crystalline B) Semi-crystalline C) Transparent D) Semi-conducting E) 100% amorphous
1. A set of narrow molecular weight polymer standards for a polymer, X, was synthesized Polydispersities...
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
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 mo...
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...
Consider the following two polymeric systems: A. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of...
Consider the following two polymeric systems: A. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 50,000 g/mol, and 8% of the available sites crosslinked. B. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 200,000 g/mol, and 20% of the available sites crosslinked. Respond to the following questions and justify your answer. a) Which polymer will display the highest stiffness? Why? (2 points) b) Which polymer will display the highest tensile strength? Why? (2 points) c) Consider that polymer...
7. Please calculate the number-averaged molecular weight and weight-averaged molecular weight for the following polymer. (6...
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
What is the molecular weight of the polymer prepared by the self condensation of HO‐C6H5‐COOH, if...
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
Question: You can assume an average molecular weight of 110 g/mol for an amino acid. Why? Please explain thorougly.
Question: You can assume an average molecular weight of 110 g/mol for an amino acid. Why? Please explain thorougly.
7. How would polymer molecular weight affect the adhesion properties of wood adhesives? (10 pts)
7. How would polymer molecular weight affect the adhesion properties of wood adhesives? (10 pts)
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...
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.
In general, as the molecular weight of a sample increases, its strength properties such as Young's modulus and tensile strength: A) There is no relationship between these properties B) Decrease C) Increase Save Question 33 (1 point) A polymer sample cooled slowly from 160°C to room temperature using natural convection is likely to be: A) 100% crystalline B) Semi-crystalline C) Transparent D) Semi-conducting E) 100% amorphous
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
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...
Consider the following two polymeric systems: A. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 50,000 g/mol, and 8% of the available sites crosslinked. B. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 200,000 g/mol, and 20% of the available sites crosslinked. Respond to the following questions and justify your answer. a) Which polymer will display the highest stiffness? Why? (2 points) b) Which polymer will display the highest tensile strength? Why? (2 points) c) Consider that polymer...
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
7. How would polymer molecular weight affect the adhesion properties of wood adhesives? (10 pts)
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