Metal soaps in oil paintings - UvA · 3 The crystallisation of metal soaps and fatty acids in...
Transcript of Metal soaps in oil paintings - UvA · 3 The crystallisation of metal soaps and fatty acids in...
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Metal soaps in oil paintStructure, mechanisms and dynamicsHermans, J.J.
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Citation for published version (APA):Hermans, J. J. (2017). Metal soaps in oil paint: Structure, mechanisms and dynamics.
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Download date: 22 Mar 2021
3The crystallisation of metal soaps and
fatty acids in linseed oil
This chapter is based on:J. J. Hermans, K. Keune, A. van Loon and P. D. Iedema,
Physical Chemistry Chemical Physics 18, 2016, 10896-10905
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f
mol fraction HPa
T (°C
)
00 0.2 0.4 0.6 0.8 1
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ΔHm
elt (kJ/mol H
Pa)
±
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= ○ ( − )
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± ± ±± ± ± ⋅± ± ± ⋅
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hyst
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is (°C
)
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ΔHm
elt (kJ/mol)
HPaPbPaZnPa
///
0 0.2 0.4 0.6 0.8 1mol fraction PbPa
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T (°C
)
0
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ΔHm
elt (kJ/mol PbPa)
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⋅ −
0 0.2 0.4 0.6 0.8 1mol fraction ZnPa
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T (°C
)
0
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ΔHm
elt (kJ/mol ZnPa)
⋅ −
± ±○
0 0.2 0.4 0.6 0.8 1mol fraction ZnPa
0 0.2 0.4 0.6 0.8 1mol fraction PbPa
0 0.2 0.4 0.6 0.8 1mol fraction HPa
0
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ΔHm
elt (k
J/m
ol m
ixtu
re)
a b c
= +
=
0 20 40 60 80 100 120curing time (min)
0
10
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30
40
50te
mpe
ratu
re (°
C)
-50
-40
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-20
-10
0
ΔHcrys (kJ/m
ol HPa)
a
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0
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tem
pera
ture
(°C)
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0ΔH
crys (kJ/mol ZnPa)
c
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0
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tem
pera
ture
(°C)
-100
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-40
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0
ΔHcrys (kJ/m
ol PbPa)
b
80010001200140016001800wavenumber (cm-1)
abso
rban
ce
ZnPa-LO
PbPa-LO
unheated
3h at 150 °C
25d at RT
unheated
3h at 150 °C
25d at RT
ZnPa
PbPa
0 50 100 150time (min)
0.14
0.16
0.18
0.20
3010
cm
-1 b
and
inte
nsity
HPa-LOPbPa-LOZnPa-LO
a b
−−−−
− − −−
−
−
− −
−− −
−− −−−− −
− −
a
f
dc
e
C15H31COOH
Pb(C6H13COO)2
Zn(C7H15COO)2
b
− −
− −
8001000120014001600wavenumber (cm-1)
abso
rban
ce
30 °C
110 °C
150 °C
PbPaa
8001000120014001600wavenumber (cm-1)
abso
rban
ce
30 °C
115 °C
160 °C
ZnPab