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?
Homework Answers
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polymer question
A polystyrene sample
is made by mixing
two types of
polystyrene chains. The
weight
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...
Q1. The following data was reported for the fractionation of a polyester made from sebacic acid...
Q1. The following data was reported for the fractionation of a polyester made from sebacic acid and 1,6-hexanediol. (10 marks) Molecular weight range (g/mol) Fractions 8000-16000 16000-24000 24000-32000 32 40000-48000 48000-56000 0.05 0.16 0.24 0.28 0.20 0.07 (I)Draw the structure of the monomers and the polymer. (II)Identify the repeat unit (II) Identify the functionality of the monomers (IV) Evaluate Mn, Mw and the D (V)Calculate the degree of polymerization of the polymer Q2. A polymer mixture is prepared by mixing...
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
Problem: 1.3: Calculate the number average and weight average relative molecular mass for a sample of...
Problem: 1.3: Calculate the number average and weight average relative molecular mass for a sample of polystyrene made by blending eight separate fractions, each of which has a very narrow molecular mass distribution, as follows: RMM | Weight/ g 15k 0.10 27k 0.19 39k56k78k 0.25 0.17 0.12 104k120k 0.08 0.06 153k 0.04 | Solution:
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
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...
full work pls and answer the whole question pls nber-average and weight-average molecular weight. Is it possible to...
full work pls and answer the whole question pls
nber-average and weight-average molecular weight. Is it possible to have a polypropylene polymer with the following molecular weight data and a num degree of polymerization of 1134? Why or why not? Molecular Weight Range (g/mol) 8000-20000 W 0.02 0.05 20000-32000 0.08 0.15 32000-44000 0.17 0.21 44000-56000 0.29 0.28 56000-68000 0.23 0.18 68000-80000 0.16 0.10 80000-92000 0.05 0.03 The chemical formula for the polypropylene monomer is C3H6. The atomic weights of carbon...
1-Calculate the molecular weight of the repeat unit (monomer) for polystyrene (above) (2 marks) 2-Using the...
1-Calculate the molecular weight of the repeat unit (monomer)
for polystyrene (above) (2 marks)
2-Using the table below, calculate the degree of polymerisation
for polystyrene
Molecular weight range (g/mol)
Number fraction,xi
500-1000
0.02
1000-3000
0.13
3000-5000
0.25
5000-10000
0.41
10000-25000
0.15
25000-50000
0.04
3-Which crystal type would be expected for Nickel Oxide (NiO,
Ni2+ ionic radius = 0.069nm, O2- ionic radius
= 0.14nm) (2 marks)
4-In order to save weight, a composite component is to be made
of aligned fibreglass...
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...
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...
Q1. The following data was reported for the fractionation of a polyester made from sebacic acid and 1,6-hexanediol. (10 marks) Molecular weight range (g/mol) Fractions 8000-16000 16000-24000 24000-32000 32 40000-48000 48000-56000 0.05 0.16 0.24 0.28 0.20 0.07 (I)Draw the structure of the monomers and the polymer. (II)Identify the repeat unit (II) Identify the functionality of the monomers (IV) Evaluate Mn, Mw and the D (V)Calculate the degree of polymerization of the polymer Q2. A polymer mixture is prepared by mixing...
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
Problem: 1.3: Calculate the number average and weight average relative molecular mass for a sample of polystyrene made by blending eight separate fractions, each of which has a very narrow molecular mass distribution, as follows: RMM | Weight/ g 15k 0.10 27k 0.19 39k56k78k 0.25 0.17 0.12 104k120k 0.08 0.06 153k 0.04 | Solution:
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...
full work pls and answer the whole question pls
nber-average and weight-average molecular weight. Is it possible to have a polypropylene polymer with the following molecular weight data and a num degree of polymerization of 1134? Why or why not? Molecular Weight Range (g/mol) 8000-20000 W 0.02 0.05 20000-32000 0.08 0.15 32000-44000 0.17 0.21 44000-56000 0.29 0.28 56000-68000 0.23 0.18 68000-80000 0.16 0.10 80000-92000 0.05 0.03 The chemical formula for the polypropylene monomer is C3H6. The atomic weights of carbon...
1-Calculate the molecular weight of the repeat unit (monomer)
for polystyrene (above) (2 marks)
2-Using the table below, calculate the degree of polymerisation
for polystyrene
Molecular weight range (g/mol)
Number fraction,xi
500-1000
0.02
1000-3000
0.13
3000-5000
0.25
5000-10000
0.41
10000-25000
0.15
25000-50000
0.04
3-Which crystal type would be expected for Nickel Oxide (NiO,
Ni2+ ionic radius = 0.069nm, O2- ionic radius
= 0.14nm) (2 marks)
4-In order to save weight, a composite component is to be made
of aligned fibreglass...
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...
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