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Engineering Materials Technology, 2nd Edition
book

Engineering Materials Technology, 2nd Edition

by William Bolton
October 2013
Intermediate to advanced content levelIntermediate to advanced
468 pages
20h 15m
English
Newnes
Content preview from Engineering Materials Technology, 2nd Edition
332 Engineering Materials Technology
Polymers have higher thermal expansivities than metals, in general about 2
to 10 times greater. Polypropylene has a linear thermal expansivity of about 9
x 10~
5
K"
1
while copper has a value of 1.7 x 10"
5
K"
1
.
Solid polymers have specific heat capacities two to five times those of metals.
For example, low density polythene has a specific heat capacity of 1.9 kj
kg"
1
K"
1
, copper 0.38 kj kg"
1
K"
1
.
Polymers are electrical insulators, having resistivities which are about 10
20
times greater than those of
metals.
If
a
piece of polymer is rubbed with a piece
of cloth it will become electrically charged, the hig
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Publisher Resources

ISBN: 9781483141077