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Table 2 Results of FTIR-ATR analysis for the samples exposed to artificial ageing for a maximum of 748 h: PUV1 (exposed on grain side) and PUV2 (exposed on corium side)

From: Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table method

Exposure time (hours)

νAI (cm−1)

νAII (cm−1)

Δν(AI–AII)

I(AI)

I(AII)

I(AIII)

a(AI)

PUV1 (grain side)

 0

1635

1552

83

0.27

0.206

0.093

144.97

 12

1635

1552

83

0.32

0.238

0.073

149.40

 83

1635

1546

89

0.09

0.066

0.057

157.96

 248

1640

1546

94

0.25

0.195

0.082

169.64

 392

1640

1541

99

0.14

0.103

0.057

175.83

 748

1646

1530

116

0.09

0.068

0.040

185.81

PUV2 (corium side)

 0

1635

1552

83

0.313

0.227

0.089

142.86

 12

1635

1549

86

0.330

0.235

0.079

148.87

 83

1640

1544

96

0.270

0.182

0.071

156.60

 248

1640

1540

100

0.244

0.173

0.09

168.17

 392

1645

1536

109

0.228

0.152

0.076

169.96

 748

1648

1532

116

0.160

0.110

0.063

180.41

  1. The wavenumber values of Amide I (νAI) and Amide II (νAII), the cumulative peak shift of Amide I and Amide II (Δν), the intensity of Amide I, II and III bands (I(AI), I(AII), I(AIII)), as well as the area of the Amide I peak (a(AI)) are listed for each mock-up at selected times