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.
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
Section: Chapter Questions
Problem 59QRT
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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
(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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