Table 5b. Percent weight gain of PVC exposed to TCE solutions.
Relative
Contact time, months
solubility
3
6
9
12
15
18
0.00
0.26
0.00
0.26
0.17
0.27
0.17
0.00
0.23
0.25
0.25
0.21
0.17
0.25
0.00
0.25
0.25
0.33
0.33
0.34
0.09
0.00
0.17
0.39
0.08
0.25
0.16
0.18
0.00
0.26
0.35
0.33
0.16
0.08
0.33
0.23a
0.25a
0.25a
0.22a
0.20a
0.20a
X
S.D.
0.04
0.15
0.10
0.07
0.10
0.09
0.05
0.25
0.25
0.25
0.17
0.36
0.16
0.05
0.32
0.32
0.26
0.34
0.26
0.19
0.05
0.08
0.42
0.17
0.26
0.27
0.16
0.05
0.18
0.33
0.17
0.33
0.26
0.34
0.05
0.20
0.26
0.27
0.25
0.42
0.24
0.21a
0.32a
0.22a
0.27a,b
0.31b
0.22a
X
S.D.
0.09
0.07
0.05
0.07
0.07
0.07
0.10
0.26
0.29
0.25
0.25
0.33
0.09
0.10
0.25
0.16
0.17
0.18
0.26
0.20
0.10
0.18
0.29
0.34
0.27
0.35
0.16
0.10
0.25
0.39
0.51
0.40
0.17
0.34
0.10
0.18
0.33
0.18
0.17
0.17
0.34
0.22a
0.29a
0.29a,b
0.25a,b
0.26a,b
0.23a
X
S.D.
0.04
0.08
0.14
0.09
0.08
0.11
0.20
0.34
0.41
0.00
0.35
0.34
0.28
0.20
0.35
0.24
0.27
0.24
0.42
0.25
0.20
0.35
0.34
0.34
0.41
0.25
0.27
0.20
0.26
0.25
0.36
0.34
0.35
0.34
0.20
0.34
0.25
0.17
0.41
0.18
0.34
0.33b
0.30a
0.23a
0.35b
0.31a,b
0.30a,b
X
S.D.
0.04
0.08
0.15
0.07
0.09
0.04
0.40
0.33
0.30
0.43
0.40
0.53
0.57
0.40
0.33
0.41
0.42
0.44
0.44
0.33
0.40
0.41
0.41
0.41
0.52
0.40
0.34
0.40
0.40
0.34
0.43
0.47
0.33
0.25
0.40
0.32
0.27
0.29
0.59
0.54
0.34
0.36b
0.35a
0.40b
0.49c
0.45c
0.37b
X
S.D.
0.04
0.07
0.06
0.07
0.09
0.12
0.60
0.75
0.65
0.66
0.94
0.86
0.83
0.60
0.57
0.72
0.88
0.90
0.75
0.72
0.60
0.61
0.49
0.65
0.90
0.78
0.55
0.60
0.60
0.43
0.74
0.78
0.82
0.63
0.60
0.66
0.68
0.75
0.78
0.74
0.53
0.64c
0.60b
0.74c
0.86d
0.79d
0.65c
X
S.D.
0.07
0.12
0.09
0.07
0.05
0.13
S.D. = standard deviation
Values with different letters, taken at the same time, are significantly different.
changes in the hardness readings of PVC, although
of 0.8 and a TCE solution (a solution with a swell-
none of these samples actually became pliable
ing agent) with a relative solubility of 0.8. There
(Table 6). The ability of the solution to soften PVC
does not appear to be a synergistic effect with this
appears to be correlated with the sum of the rela-
solution, i.e., the ability to soften PVC does not
tive solubilities of the organic solutes, since the
appear to be enhanced beyond a simple cumula-
behavior of the two test solutions was between
tive effect.
that of a methylene chloride solution (i.e., a solu-
However, the data (both weight change and
tion with a PVC solvent) with a relative solubility
hardness values) also show the limitations of us-
11
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