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4- Glasses: a. Are noncrystalline ceramics b. Deform by viscous flow C. Are often transparent d....
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...
for the perovskite structure (shown below) 14. Coordination numbers of Ti". Ba?' and are, respectively: a....
for the perovskite structure (shown below) 14. Coordination numbers of Ti". Ba?' and are, respectively: a. 6, 6, and 6 b. 12,6, and 6 c. 6, 16, and 8 d. 6, 12, and 6 15. In the cesium chloride (CCI) structure, cations are located at a cach of the corners of cubes b. the centre of cubes c. interior tetrahedral sites d. interior octahedral sites 16. Low density polyethylene (LDPE) is a. a linear polymer b. a branched polymer c....
a) compute the repeat unit molecular weight of polystyrene b) compute the number-average molecular weight for...
a) compute the repeat unit molecular weight of
polystyrene
b) compute the number-average molecular weight for
polystyrene for which the degree of polymerization is 26,000.
54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a...
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.
Polystyrene can be polymerized from the starting monomer (styrene) pictured below. a. Anionic polymerization is one...
Polystyrene can be polymerized from the starting monomer
(styrene) pictured below.
a. Anionic polymerization is one method of polymerization that
can be used to generate polystyrene from styrene. Explain what type
of initiator should be used for this reaction
and draw an example of a styrene monomer that has reacted with
initiator.
b. Using this anionic polymerization method and a starting
concentration of 1M styrene and 1mM initiator, what degree of
polymerization (Xn) would you expect if you use up...
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a...
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Please write legibly Please handwrite.
Q6. 2/2 points (a)What are the chemical formulas for the compounds below ? Are the compounds...
Q6. 2/2 points
(a)What are the chemical formulas for the compounds below ?
Are the compounds shown
below isomers?
(b) Consider the two alkene compounds below? Which one is cis,
which one is trans?
Q7. 3/3/3 points
(a) What are addition polymerization steps?
(b) What type of polymerization does the below reaction
present?
(c) Calculate the degree of polymerization if 6,6-nylon has a
molecular weight of 120,000 g/mol, two repeating unit of Nylon6,6
shown in (b).
Q8. 4 points...
Polymer Chemistry: Problem 2. Polystyrene chains dissolved in cyclohexane at 35°C (theta conditions) can be separated...
Polymer Chemistry:
Problem 2. Polystyrene chains dissolved in cyclohexane at 35°C (theta conditions) can be separated by ultrafiltration according to molecular weight. The ultrafiltration process employs pressure-driven flow of a solution through a porous membrane to separate solutes by their molecular size. Molecules larger than the pore size are retained upstream of the membrane while smaller molecules pass through. In this exercise, the root mean square end-end- distance will be considered to provide an appropriate measure of molecular size. The...
Your colleague has synthesized two different polymers from the same mer unit, sample A and B....
Your colleague has synthesized two different polymers from the same mer unit, sample A and B. Sample A demonstrates greater strength, lower ductility, and higher softening temperature compared to sample B. Based on this information, compare the following possibilities between the two samples: Degree of branching Degree of crosslinking Number-average molecular weight Degree of polymerization Size of mer side chain Sample A is > Sample B in which of of these aspects? Please also explain why
14. (a) Compute the repeat unit molecular weight of polystyrene and the number-average (b) Viscoelastic creep...
14. (a) Compute the repeat unit molecular weight of polystyrene and the number-average (b) Viscoelastic creep of some polymer materials can be modelled using a spring and dashpot molecular weight of the material if the degree of polymerisation is 25,000. in parallel configuration as shown in the following figure. Derive the mathematical expression for the strain as a function of time. 凹η (6+6 marks
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...
for the perovskite structure (shown below) 14. Coordination numbers of Ti". Ba?' and are, respectively: a. 6, 6, and 6 b. 12,6, and 6 c. 6, 16, and 8 d. 6, 12, and 6 15. In the cesium chloride (CCI) structure, cations are located at a cach of the corners of cubes b. the centre of cubes c. interior tetrahedral sites d. interior octahedral sites 16. Low density polyethylene (LDPE) is a. a linear polymer b. a branched polymer c....
a) compute the repeat unit molecular weight of
polystyrene
b) compute the number-average molecular weight for
polystyrene for which the degree of polymerization is 26,000.
54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
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.
Polystyrene can be polymerized from the starting monomer
(styrene) pictured below.
a. Anionic polymerization is one method of polymerization that
can be used to generate polystyrene from styrene. Explain what type
of initiator should be used for this reaction
and draw an example of a styrene monomer that has reacted with
initiator.
b. Using this anionic polymerization method and a starting
concentration of 1M styrene and 1mM initiator, what degree of
polymerization (Xn) would you expect if you use up...
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Please write legibly Please handwrite.
Q6. 2/2 points
(a)What are the chemical formulas for the compounds below ?
Are the compounds shown
below isomers?
(b) Consider the two alkene compounds below? Which one is cis,
which one is trans?
Q7. 3/3/3 points
(a) What are addition polymerization steps?
(b) What type of polymerization does the below reaction
present?
(c) Calculate the degree of polymerization if 6,6-nylon has a
molecular weight of 120,000 g/mol, two repeating unit of Nylon6,6
shown in (b).
Q8. 4 points...
Polymer Chemistry:
Problem 2. Polystyrene chains dissolved in cyclohexane at 35°C (theta conditions) can be separated by ultrafiltration according to molecular weight. The ultrafiltration process employs pressure-driven flow of a solution through a porous membrane to separate solutes by their molecular size. Molecules larger than the pore size are retained upstream of the membrane while smaller molecules pass through. In this exercise, the root mean square end-end- distance will be considered to provide an appropriate measure of molecular size. The...
14. (a) Compute the repeat unit molecular weight of polystyrene and the number-average (b) Viscoelastic creep of some polymer materials can be modelled using a spring and dashpot molecular weight of the material if the degree of polymerisation is 25,000. in parallel configuration as shown in the following figure. Derive the mathematical expression for the strain as a function of time. 凹η (6+6 marks
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