Essentials of Materials Science and Engineering, SI Edition
Essentials of Materials Science and Engineering, SI Edition
4th Edition
ISBN: 9781337672078
Author: ASKELAND, Donald R., WRIGHT, Wendelin J.
Publisher: Cengage Learning
Question
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Chapter 16, Problem 16.16P
Interpretation Introduction

Interpretation:

The molecular weights of all the repeat units of the polymers given in table 16.3 are to be calculated.

Concept Introduction:

The formula to calculate the molecular weight of a repeat unit is:

  (MW)repeat unit=iaiEi ..... (1)

Here, ai is the stoichiometric number of element Ei present in the repeat unit.

Expert Solution & Answer
Check Mark

Answer to Problem 16.16P

The molecular weights of all the repeat units of the polymers given in table 16.3 are:

1. Polyethylene ([C2H4]), (MW)repeat unit=28 g/mol

2. Polyvinyl chloride ([C2H3Cl]), (MW)repeat unit=62.5 g/mol

3. Polypropylene ([C3H6]), (MW)repeat unit=42 g/mol

4. Polystyrene ([C8H8]), (MW)repeat unit=104 g/mol

5. Polyacrylonitrile ([C3H3N]), (MW)repeat unit=53 g/mol

6. Polymethyl methacrylate ([C5H8O2]), (MW)repeat unit=100 g/mol

7. Polychlorotrifluoroethylene ([C2F3Cl]), (MW)repeat unit=116.5 g/mol

8. Polytetrafluoroethylene ([C2F4]), (MW)repeat unit=100 g/mol

Explanation of Solution

Name of all the polymers and molecular formula of their repeat units from table 16.3 are:

1. Polyethylene ([C2H4])

2. Polyvinyl chloride ([C2H3Cl])

3. Polypropylene ([C3H6])

4. Polystyrene ([C8H8])

5. Polyacrylonitrile ([C3H3N])

6. Polymethyl methacrylate ([C5H8O2])

7. Polychlorotrifluoroethylene ([C2F3Cl])

8. Polytetrafluoroethylene ([C2F4])

Use equation (1) to calculate the molecular weight of the repeat unit of all the polymers as:

1. Polyethylene ([C2H4])

  (MW)[ C 2 H 4]=(2×C)+(4×H)=(2×12)+(4×1)=28 g/mol

2. Polyvinyl chloride ([C2H3Cl])

  (MW)[ C 2 H 3Cl]=(2×C)+(3×H)+(1×Cl)=(2×12)+(3×1)+(1×35.5)=62.5 g/mol

3. Polypropylene ([C3H6])

  (MW)[ C 3 H 6]=(3×C)+(6×H)=(3×12)+(6×1)=42 g/mol

4. Polystyrene ([C8H8])

  (MW)[ C 8 H 8]=(8×C)+(8×H)=(8×12)+(8×1)=104 g/mol

5. Polyacrylonitrile ([C3H3N])

  (MW)[ C 3 H 3N]=(3×C)+(3×H)+(1×N)=(3×12)+(3×1)+(1×14)=53 g/mol

6. Polymethyl methacrylate ([C5H8O2])

  (MW)[ C 5 H 8 O 2]=(5×C)+(8×H)+(2×O)=(5×12)+(8×1)+(2×16)=100 g/mol

7. Polychlorotrifluoroethylene ([C2F3Cl])

  (MW)[ C 2 F 3Cl]=(2×C)+(3×F)+(1×Cl)=(2×12)+(3×19)+(1×35.5)=116.5 g/mol

8. Polytetrafluoroethylene ([C2F4])

  (MW)[ C 2 F 4]=(2×C)+(4×F)=(2×12)+(4×19)=100 g/mol

Conclusion

The molecular weights of all the repeat units of the polymers given in table 16.3 are:

1. Polyethylene ([C2H4]), (MW)repeat unit=28 g/mol

2. Polyvinyl chloride ([C2H3Cl]), (MW)repeat unit=62.5 g/mol

3. Polypropylene ([C3H6]), (MW)repeat unit=42 g/mol

4. Polystyrene ([C8H8]), (MW)repeat unit=104 g/mol

5. Polyacrylonitrile ([C3H3N]), (MW)repeat unit=53 g/mol

6. Polymethyl methacrylate ([C5H8O2]), (MW)repeat unit=100 g/mol

7. Polychlorotrifluoroethylene ([C2F3Cl]), (MW)repeat unit=116.5 g/mol

8. Polytetrafluoroethylene ([C2F4]), (MW)repeat unit=100 g/mol

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