Determination of Thermal Behavior of Leathers in Different Processes by Differential Scanning Calorimetry and Evaluation of the Analysis Conditions

Öz

The study examined the thermal behavior of leathers in different processes by differential scanning calorimetry (DSC) under the various analysis conditions and the representativeness of hydrothermal stability of leathers by DSC method were investigated. For this purpose, hydrothermal stability of the raw skin, pickled, tanned and finished leathers was firstly analyzed with standard shrinkage temperature test. Then, same leather samples were analyzed in dry and wet states under the different conditioning parameters by DSC method. The obtained data showed that the leather samples analyzed between 25-150 oC, in aqueous media, conditioned for 24 h and within the anti-pressure cells provided the best results. Moreover, the data derived from DSC thermograms under the cited conditions were also parallel with the shrinkage temperature (Ts) values of leathers obtained by standard method. 

Anahtar Kelimeler

• Leather,thermal analysis,DSC,thermogram,shrinkage temperature

Farklı Proses Aşamasındaki Derilerin Diferansiyel Taramalı Kalorimetre ile Termal Davranışlarının Belirlenmesi ve Analiz Koşullarının Değerlendirilmesi

Öz

Çalışmada farklı proses aşamasındaki derilerin termal davranışları çeşitli koşullar altında diferansiyel taramalı kalorimetre (DSC) ile incelenmiş ve derilerin hidrotermal stabilitesinin DSC ile tespit edilebilirliği araştırılmıştır. Bu amaçla öncelikle ham deri, pikle, tabaklanmış ve mamul haldeki derilerin hidrotermal stabilitesi, büzülme sıcaklığı standart testi ile analiz edilerek belirlenmiştir. Ardından aynı deri örnekleri farklı koşullandırma parametreleri kullanılarak kuru ve yaş formda DSC metodu ile analiz edilmiştir. Elde edilen veriler; 24 saat koşullandırılmış ve basınca dayanıklı kaplar içerisinde, sulu ortamda, 25-150 oC aralığında analiz edilen deri örneklerinin en iyi sonuçları verdiğini göstermiştir. Aynı zamanda mevcut koşullardaki DSC termogramlarından elde edilen verilerin, derilerin standart metot ile elde edilen büzülme sıcaklığı (Ts) değerleri ile paralellik gösterdiği tespit edilmiştir. 

Anahtar Kelimeler

• Deri,termal analiz,DSC,termogram,büzülme sıcaklığı

Kaynakça

1. Nalyanya, K.M., Rop, R.K., Onyuka, A.S., Kilee, T., Migunde, P.O., Ngumbu, R.G., (2016), Thermal and dynamic mechanical analysis of bovine hide, Journal of Thermal Analysis and Calorimetry, 126(2), 725-732.
2. Sebestyen, Z., Czegeny, Z., Badea, E., Carsote, C., Sendrea, C., Barta-Rajnai, E., Bozi, J., Miu, L., Jakab, E., (2015), Thermal characterization of new, artificially aged and historical leather and parchment, Journal of Analytical and Applied Pyrolysis, 115, 419-427.
3. Hoefler, J., Hageman, B., Chung, C.J., Smith, R., (2013), High performance acrylic polymer technology for use in leather finishing processes, Journal of the American Leather Chemists Association, 108(8), 311-317.
4. Musa, A.E., Gasmelseed, G.A., (2012), Combination tanning system for manufacture of shoe upper leathers: Cleaner tanning process, Journal of the Society of Leather Technologists and Chemists, 96(6), 239-245.
5. Popescu, C., Budrugeac, P., Wortmann, F.J., Miu, L., Demco, D.E., Baias, M., (2008), Assessment of collagen-based materials which are supports of cultural and historical objects, Polymer Degradation and Stability, 93(5), 976-982.
6. Covington, A.D., (2009), Tanning Chemistry, The Science of Leather, The University of Northampton, Northampton, UK.
7. Carsote, C., Budrugeac, P., Miu, L., Yalcin, F., Karavana, H.A., Badea, E., (2014), Effect of temperature and relative humidity on vegetable tanned leathers studied by thermal analysis, ICAMS 2014 - 5th International Conference on Advanced Materials and Systems, 505-510.
8. Budrugeac, P., (2015), Phase transitions of a parchment manufactured from deer leather: A calorimetric and kinetic analysis, Journal of Thermal Analysis and Calorimetry, 120(1), 103-112.

9. Cucos, A., Budrugeac, P., Mitrea, S., Hajdu, C., (2013), The influence of sodium chloride on the melting temperature of collagen crystalline region in parchments, Journal of Thermal Analysis and Calorimetry, 111(1), 467-473.
10. Tang, H.R., Covington, A.D., Hancock, R.A., (2003), Use of DSC to detect the heterogeneity of hydrothermal stability in the polyphenol-treated collagen matrix, Journal of Agricultural and Food Chemistry, 51(23), 6652-6656.
11. Shi, J.B., Ren, K.S., Wang, C.H., Wang, J., Lin, W., (2016), A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage, Journal of the Society of Leather Technologists and Chemists, 100(1), 25-30.
12. Safandowska, M., Pietrucha, K., (2013), Effect of fish collagen modification on its thermal and rheological properties, International Journal of Biological Macromolecules, 53, 32-37.
13. Krishnamoorthy, G., Sadulla, S., Sehgal, P.K., Mandal, A.B., (2012), Green chemistry approaches to leather tanning process for making chrome-free leather by unnatural amino acids, Journal of Hazardous Materials, 215, 173-182.
14. Usha, R., Ramasami, T., (2008), Role of solvents in stability of collagen, Journal of Thermal Analysis and Calorimetry, 93(2), 541-545.
15. Chen, H., Shan, Z.H., (2008), Changes in hydrothermal stability of collagen with several catechin-metal compounds: A DSC study, Journal of the Society of Leather Technologists and Chemists, 92(3), 93-95.
16. Ershad-Langroudi, A., Mirmontahai, A., (2015), Thermal analysis on historical leather bookbinding treated with PEG and hydroxyapatite nanoparticles, Journal of Thermal Analysis and Calorimetry, 120(2), 1119-1127.
17. Carsote, C., Badea, E., Miu, L., Gatta, G.D., (2016), Study of the effect of tannins and animal species on the thermal stability of vegetable leather by differential scanning calorimetry, Journal of Thermal Analysis and Calorimetry, 124(3), 1255-1266.
18. Edmonds, R., (2016), Application of modulated temperature differential scanning calorimetry (MTDSC) on leather, Journal of the Society of Leather Technologists and Chemists, 100(6), 283.
19. Onem, E., Yorgancioglu, A., Yilmaz, O., Karavana, H.A., Zengin, G., Bitlisli, B.O., (2017), Evaluation of the analysis conditions for DSC instrument to realize the thermal behaviors of leathers, 4th International Leather Engineering Congress-Innovative Aspects for Leather Industry, 19-20 October 2017, Izmir-Turkey, Oral Presentation, 115-129.
20. IUP 16, (2002), Leather – Physical and mechanical tests – Determination of shrinkage temperature up to 100 oC.
21. Onem, E., Yorgancioglu, A., Karavana, H.A., Yilmaz, O., (2017), Comparison of different tanning agents on the stabilization of collagen via differential scanning calorimetry, Journal of Thermal Analysis and Calorimetry, 129(1), 615-622.