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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...
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...
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
Problem 2 Poly(3hydroxybut yrate) (PHB), a semicrystallne polymer that is fully biodegrad- able and biocompatible, is...
Problem 2 Poly(3hydroxybut yrate) (PHB), a semicrystallne polymer that is fully biodegrad- able and biocompatible, is obtained from renewable resources. From a sus tainability perspective, PHB offers many attactive properties though i is more expensive to produce than standard psties. The following data con tains the melting point (C") values for 12 specimens of the polymer: 80. 181.7 180.9 181.6 182.6 181.6 181.3 182.1 1821 180.3 181.7 180.5 ( 8 paintsl Give the 2) (2 points) Caleulate the sa mple...
From problem 9.10 in the book. An initial experiment at an eyeglass manufacturer has produced poly(methyl...
From problem 9.10 in the book. An initial experiment at an eyeglass manufacturer has produced poly(methyl methacrylate), whose monomer is (used in eyeglasses and hard contact lenses) with a number average molecular weight of 143,000, by carrying out the reaction at 65 °C for 45 minutes. Since the product design group has determined that a molecular weight of 100,000 is satisfactory, how fast can you speed up the production process and still achieve the desired MW? The activation energies for...
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
Problem 2 Poly(3hydroxybut yrate) (PHB), a semicrystallne polymer that is fully biodegrad- able and biocompatible, is obtained from renewable resources. From a sus tainability perspective, PHB offers many attactive properties though i is more expensive to produce than standard psties. The following data con tains the melting point (C") values for 12 specimens of the polymer: 80. 181.7 180.9 181.6 182.6 181.6 181.3 182.1 1821 180.3 181.7 180.5 ( 8 paintsl Give the 2) (2 points) Caleulate the sa mple...
From problem 9.10 in the book. An initial experiment at an eyeglass manufacturer has produced poly(methyl methacrylate), whose monomer is (used in eyeglasses and hard contact lenses) with a number average molecular weight of 143,000, by carrying out the reaction at 65 °C for 45 minutes. Since the product design group has determined that a molecular weight of 100,000 is satisfactory, how fast can you speed up the production process and still achieve the desired MW? The activation energies for...
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