Homework Answers
Add Answer to:
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...
A polymer consists of bonded -CH2CHCl- monomer units. From the data table, compute Mn, Mw, and...
A polymer consists of bonded -CH2CHCl- monomer units. From the data table, compute Mn, Mw, and the polydispersity for a sample of this polymer to two decimal places. Fraction Monomer units/chain Number of Chains 1 3 33 2 4 55 3 5 81 4 6 106 5 7 126 1. Mn: Tries 0/99 2. Mw: Tries 0/99 3. polydispersity: Tries 0/99
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...
Isotactic Polypropylene (C3H6 MW=42g/mol), a thermo plastic is synthesized using bulk polymerization. For a monodisperse sample...
Isotactic Polypropylene (C3H6 MW=42g/mol), a thermo plastic is
synthesized using bulk polymerization. For a monodisperse sample
(PDI=1) the bigger molecule(higher degree of polymerization)
contain the same total mass of the polymer sample than the smaller
molecules(lower degree of polymerization). For a polydisperse
sample the MW fractions do not contain the same mass.
Flexlife is the capability of polymeric material to withstand
repeated bending without fracture. The Z average MW (Mz) is a
measure of flexlofe as well as the predominance...
1. Compute the molecular weight of a single, (1), polystyrene (PS) repeat unit. 2. Compute the...
1. Compute the molecular weight of a single, (1), polystyrene (PS) repeat unit. 2. Compute the degree of polymerization for a polystyrene (PS) polymer with a number-average molecular weight of 279,799 g/mol. 3. What is the number-average molecular weight of a PC polymer that features a degree of polymerization of 1,890 ? 4. An alternating poly(ethylene-propylene) copolymer has a molecular weight of 294,419 g/mol. How many ethylene repeat units are in one average length chain of this polymer ? 5....
polymer question A polystyrene sample is made by mixing two types of polystyrene chains. The weight
polymer question A polystyrene sample is made by mixing two types of polystyrene chains. The weight fractions of each type are the same. The degree of polymerization of the first chain type is 96, for the second is 192. What is the number average molecular weight of this mixture?
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by...
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH) (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol...
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction...
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.32; assume that this concentration corresponds to a degree of polymerization of 2030. Calculate the molecular weight of the acrylonitrile repeat unit in g/mol. Part 2 Calculate the molecular weight of the butadiene repeat unit in g/mol. Part 3 Calculate the average molecular weight of the copolymer repeat unit in g/mol. Click here to access Table 4.5. m =...
Vice Canada Ap. Two polymers are comprised of the same monomer. Their product labels indicate information...
Vice Canada Ap. Two polymers are comprised of the same monomer. Their product labels indicate information about the molecular weight and melting temperature: 10 pts Molecular weight Polymer 1 Melting temperature Polymer 2 425 g/mol 390 g/mol Degree of branching 190°C 260°C (not given on product label) (not given on product label) 1 (4 marks) How does the degree of branching compare in Polymer 1 versus Polymer 2, given the observed difference in melting temperatures? Justify your answer, with reference...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (CsHg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in...
Esters report- 4 2. Esters in general have a lower boiling point than their corresponding an a larger molecular wei...
Esters report- 4 2. Esters in general have a lower boiling point than their corresponding an a larger molecular weight, can you offer a reason why this is the case. in their corresponding alcohols even though
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...
Isotactic Polypropylene (C3H6 MW=42g/mol), a thermo plastic is
synthesized using bulk polymerization. For a monodisperse sample
(PDI=1) the bigger molecule(higher degree of polymerization)
contain the same total mass of the polymer sample than the smaller
molecules(lower degree of polymerization). For a polydisperse
sample the MW fractions do not contain the same mass.
Flexlife is the capability of polymeric material to withstand
repeated bending without fracture. The Z average MW (Mz) is a
measure of flexlofe as well as the predominance...
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH) (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol...
Vice Canada Ap. Two polymers are comprised of the same monomer. Their product labels indicate information about the molecular weight and melting temperature: 10 pts Molecular weight Polymer 1 Melting temperature Polymer 2 425 g/mol 390 g/mol Degree of branching 190°C 260°C (not given on product label) (not given on product label) 1 (4 marks) How does the degree of branching compare in Polymer 1 versus Polymer 2, given the observed difference in melting temperatures? Justify your answer, with reference...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (CsHg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in...
Esters report- 4 2. Esters in general have a lower boiling point than their corresponding an a larger molecular weight, can you offer a reason why this is the case. in their corresponding alcohols even though
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago