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Encyclopedia of Physical Science and Technology EN008C-602 July 25, 2001 20:31

Macromolecules, Structure 861

TABLE I (Continued)
◦
Polymer Chain unit T m ( C) a T g ( C) b
◦
Polychlorotrifluoroethylene ( CF 2 CF n ( 218 45
Cl
Poly(2,6-dimethylphenylene oxide) CH 3
O n

CH 3
Poly(dimethylsiloxane) CH 3 −123
( Si O n (
CH 3
Polyisobutene ( C(CH 3 ) 2 CH 2 n ( −73
Polyisoprene
Cis-1,4 CH 3 H −73
(natural rubber)
C C
( CH 2 CH 2 n (
Trans-1,4 CH 3 CH 2 n ( −58
(gutta percha)
C C
( CH 2 H
Poly(ethyl acrylate) ( CH 2 CH n ( −24
CO 2 CH 2 CH 3
Polyethylene
High pressure, branched ∼115
Linear 135 −125 (?)
( CH 2 CH 2 n (
Linear, low density
(ethyl branches)
Poly(ethylene oxide) ( CH 2 CH 2 O ( n 66 −67
Poly(ethylene terephthalate) O O 265 69
( C C O CH 2 CH 2 O ( n

Poly(methyl acrylate) ( CHCH 2 n ( 6
CO 2 CH 3
Poly(methyl methacrylate) CH 3
Isotactic 160 ∼45
( C CH 2 ( n
Syndiotactic 200 115
CO 2 CH 3
Atactic 105
Poly(oxymethylene) ( OCH 2 n ( 195 −85
Polypropylene ( CH CH 2 n (
Isotactic 165 −10
CH 3
Atactic −20
Poly(propylene oxide) ( CH CH 2 O n ( 75 −75

CH 3
continues