Chapter 4, Polymerization and Classification Video Solutions, Polymer Engineering Science and Viscoelasticity: An Introduction

08:37

Problem 1

Give the chemical formula for the mer units of PVC, PTFE, PP, PS and PMMA.

Brittany Carnathan

Numerade Educator

00:44

Problem 2

Explain the meaning of configuration and conformation when applied to a polymer chain.

Lottie Adams

Numerade Educator

Problem 3

Give an examples of different types of configurations.

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01:26

Problem 4

What are chemical bonds?

Ajay Singhal

Numerade Educator

Problem 5

Name three primary bonds and describe each.

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01:03

Problem 6

Name four types of secondary bonds. By what other name are secondary bonds known?

Ajay Singhal

Numerade Educator

06:59

Problem 7

Give approximate energies ( $\mathrm{kcal} / \mathrm{mole}$ ) for covalent bonds. Hydrogen bond. Secondary bonds.

Shazia Naz

Numerade Educator

04:12

Problem 8

Outline (i.e., give a schematic diagram) a simple classification scheme based on bonds within chains and between chains and based on their morphology.

Marissa Turner

Numerade Educator

01:02

Problem 9

Describe a branched polymer. Name different types of branched polymers.

Narayan Hari

Numerade Educator

01:57

Problem 10

Name three types of isomers and describe each.

Dalton Hilovsky

Numerade Educator

03:03

Problem 11

Describe (i.e., give a schematic diagram) a classification system based on molecular characteristics, structure and isomeric states.

Aadit Sharma

Numerade Educator

01:01

Problem 12

Name four types of copolymers and describe each.

Narayan Hari

Numerade Educator

Problem 13

What are two possible conformations of the ethane molecule? Draw the variation of energy with angular rotation and explain the reason for the variation.

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03:37

Problem 14

Explain the trans and gauche positions along the backbone chain of a polyethylene molecule.

Bhumika Jayee

Numerade Educator

05:59

Problem 15

Derive (and explain all assumptions) an approximate relationship for the end-to-end distance of a single molecular chain.

Josee Pacheco

Numerade Educator

02:53

Problem 16

Explain the folded chain model for crystallinity. The fringed micelle model.

Eugene Schneider

University of Minnesota - Twin Cities

Problem 17

Describe a spherulite. How might they be formed.

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00:50

Problem 18

What method (or instrument) is generally used to provide evidence of a spherulite?

Hunza Gilgit

Numerade Educator

01:11

Problem 19

What method(s) is used to evaluate crystallinity? Explain.

Ajay Singhal

Numerade Educator

02:51

Give approximate characteristics of a molecular chain containing the number of mer units shown in the following table..
$$
\begin{array}{l|lc}
\hline \text { No. } & \begin{array}{l}
\text { Softening } \\
\text { Temperature }
\end{array} & \begin{array}{c}
\text { Character at } \\
25^{\circ} \mathrm{C}
\end{array} \\
\hline 1 & & \\
6 & & \\
35 & & \\
140 & & \\
430 & & \\
1,350 & &
\end{array}
$$

Narayan Hari

Numerade Educator

01:22

Problem 21

Name six methods to measure molecular weight.

David Collins

Numerade Educator

01:00

Problem 22

Briefly describe ebulliometry. Cryoscopy. Vapor pressure osmometry. Membrane osmometry.

Mari Davey

Numerade Educator

Problem 23

Briefly describe SEC (GPC).

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02:43

Problem 24

Explain the chemistry example of a condensation polymerization reaction given in the text.

Brittany Carnathan

Numerade Educator

01:38

Problem 25

Explain the chemistry example for an addition polymerization reaction given in the text.

Brittany Carnathan

Numerade Educator

01:17

Problem 26

What is a dimer? A trimer?, An Oligomer?

Mystique Till

Numerade Educator

00:52

Problem 27

What is the meaning of monofunctional? Bifunctional? Trifunctional? Which leads to thermoplastic polymers? Which leads to a thermoset? Can a monofunctional molecule be polymerized?

Dalton Hilovsky

Numerade Educator

03:23