Explain the following observations:  (i) Kevlar has an extremely high tensile strength and melting temperature.  (ii) At room temperature, poly(methylmethacrylate) is transparent, while polyethylene is translucent. At temperatures above 135°C, both polymers are transparent.  (iii) Polyoxymethylene and polyethylene exhibit similar mechanical behavior. However, the glass transition temperature of polyoxymethylene is about 50°C higher than that of polyethylene.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter10: Fuels, Organic Chemicals, And Polymers
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1. Explain the following observations:

 (i) Kevlar has an extremely high tensile strength and melting temperature. 

(ii) At room temperature, poly(methylmethacrylate) is transparent, while polyethylene is translucent. At temperatures above 135°C, both polymers are transparent. 

(iii) Polyoxymethylene and polyethylene exhibit similar mechanical behavior. However, the glass transition temperature of polyoxymethylene is about 50°C higher than that of polyethylene.

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