What number average molecular weight polystyrene would be formed by polymerization of 2.0M styrene with 1.0x10-3M...
What number average molecular weight polystyrene would be formed by polymerization of 2.0M styrene with 1.0x10-3M napthalenesodium in tetrahydrofuran? If the reaction were run at 25°C, how long would it take to reach 90% conversion?
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What number average molecular weight polystyrene would be formed
by polymerization of 2.0M styrene with 1.0x10-3M...
What would be the number-average molecular weight of polystyrene obtained at the completion of an anionic...
What would be the number-average molecular weight of polystyrene obtained at the completion of an anionic (i.e., “living”) polymerization in which 0.01 g of n-butyllithium and 10 g of styrene monomer are used? The molecular weight of butyllithium and styrene are 64.06 and 104.12, respectively.
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...
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.
For polymerization of styrene in tetrahydrofuran at 25°C using sodium naphthalide initiator, the rate coefficient for...
For polymerization of styrene in tetrahydrofuran at 25°C using sodium naphthalide initiator, the rate coefficient for propagation is 550 dm^3 mol^-1 s^-1. If the initial mass concentration of styrene is 156 g dm^-3 and that of sodium naphthalide is 3.02x10^-2 g dm^-3, calculate the initial rate of polymerization and, for complete converison of the styrene, the number-average molar mass of polystyrene formed. Comment upon the expected value of molar mass dispersity (Mw/Mn) and the stereoregularity of the polystyrene produced. Assume:...
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.
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is...
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is the number average degree of polymerization (n)? The mer structure is shown below, amu are C-12, H-1; 1 dalton 6.023x103 grams
Q3 (25 pts) The polymerization is done by the anionic mechanism, and 2 mol of polystyrene...
Q3 (25 pts) The polymerization is done by the anionic mechanism, and 2 mol of polystyrene is polymerized in tetrahydrofuran (THF). Polymerization was initiated by 1.5 x 10-3 mol of sec- Buli. a) What is the expected number average chain length? (5 pts) b) What is the expected number average chain length if the efficiency of the initiator is 80%? (10 pts) c) At 75% conversion, 0.5 x 10-3 mol of water is added and the reaction continues. What is...
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...
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...
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...
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...
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.
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.
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is the number average degree of polymerization (n)? The mer structure is shown below, amu are C-12, H-1; 1 dalton 6.023x103 grams
Q3 (25 pts) The polymerization is done by the anionic mechanism, and 2 mol of polystyrene is polymerized in tetrahydrofuran (THF). Polymerization was initiated by 1.5 x 10-3 mol of sec- Buli. a) What is the expected number average chain length? (5 pts) b) What is the expected number average chain length if the efficiency of the initiator is 80%? (10 pts) c) At 75% conversion, 0.5 x 10-3 mol of water is added and the reaction continues. What is...
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...
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...
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...
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