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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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1588-2926

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Study of the effect of tannins and animal species

Authors: Cristina Carşote Elena Badea Lucreţia Miu Giuseppe Della Gatta
Publish Date: 2016/02/19
Volume: 124, Issue: 3, Pages: 1255-1266
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Abstract

Microdifferential scanning calorimetry was used to reveal the deterioration patterns of collagen in vegetabletanned leather The influence of both the tannin type ie hydrolysable or condensed and collagen animal species ie calf and sheep was investigated Comparison with the behaviour of unmodified collagen in parchment was made to explain the thermal destabilisation and denaturation of the chemically modified collagen in leather Both leather and parchment were subjected to accelerate ageing by heating at 70 °C in controlled atmosphere at 30  RH The synergistic effect of the daylight exposure was studied by irradiating the samples in the visible domain with 4000 lx The destabilisation effect induced by the hydrothermal ageing treatment was evident since the 8th day and reached a critical level after 32day ageing time The formation of damaged intermediate states with progressively lower thermal stability was the main feature of the deterioration pattern independent of the tannin type and collagen species Quebrachotanned calf leather was the most resistant against ageing whereas chestnuttanned sheep leather underwent detanning after a 32day ageing period Exposure to visible light irradiation induced an evident thermal stabilisation due to crosslink formation The balance between thermal stabilisation and destabilisation processes in leather during visible light exposure was influenced by the tannin typeThis research was funded by the Romanian Programme for Research and Innovation PNCDI II through the project Intelligent system for analysis and diagnosis of collagenbased artefacts COLLAGE PN II 224/2012 C Carşote gratefully acknowledges the Executive Programme for Scientific and Technological Cooperation between the Italian Republic and Romania for her two research stages at the University of Turin Italy within the bilateral project Advanced techniques and interdisciplinary studies for improved assessment of historical parchments ParIS PN II 638/2013

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