Materials Science and Engineering
Materials Science and Engineering
9th Edition
ISBN: 9781118324578
Author: Jr. William D. Callister
Publisher: WILEY
Question
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Chapter 15.24, Problem 34QP

(a)

To determine

To do:

The following for branched polyethylene with number-average molecular weight of 8,50,000 g/mol and linear polyethylene with number-average molecular weight of 8,50,000 g/mol:

  1. 1. To state the possibility to decide which polymer has a greater melting temperature.
  2. 2. If it is possible to decide and give the reason for the same.
  3. 3. If it is not possible to decide and give the reason for the same.

(b)

To determine

To do:

The following for polytetrafluoroethylene with the density of 2.14g/cm3 and weight-average molecular weight of 6,00,000 g/mol, and polytetrafluoroethylene with the density of 2.20g/cm3 and weight-average molecular weight of 6,00,000 g/mol:

  1. 1. To state the possibility to decide which polymer has a greater melting temperature.
  2. 2. If it is possible to decide and give the reason for the same.
  3. 3. If it is not possible to decide and give the reason for the same.

(c)

To determine

To do:

The following for linear and syndiotactic poly (vinyl chloride) with number-average molecular weight of 5,00,000 g/mol and linear polyethylene with number-average molecular weight of 2,25,000 g/mol:

  1. 1. To state the possibility to decide which polymer has a greater melting temperature.
  2. 2. If it is possible to decide and give the reason for the same.
  3. 3. If it is not possible to decide and  give the reason for the same.

(d)

To determine

To do:

The following for linear and syndiotactic polypropylene with weight-average molecular weight of 5,00,000 g/mol , and linear and atactic polypropylene with weight-average molecular weight of 7,50,000 g/mol:

  1. 1. To state the possibility to decide which polymer has a greater melting temperature.
  2. 2. If it is possible to decide and give the reason for the same.
  3. 3. If it is not possible to decide and give the reason for the same.

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