Study of the influence of NaOH treatment on the pyrolysis of different leather tanned using thermogravimetric analysis and Py/GC–MS system

Marcilla, A.; García, A N Jesús; León, Milagros; Martínez, Pascual; Bañón, Elena

doi:10.1016/j.jaap.2011.05.014

Cited by 35 publications

(25 citation statements)

References 20 publications

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“…Ammonia and carbon dioxide can be derived from the amino and carboxyl side groups of the peptide chains, but also from the peptide bonds through more complicated reaction steps. The formation of 1-vinylaziridine (peak #9) molecules from the alkaline treated leathers was observed previously by Marcilla et al [19]. This product is common for both the parchment and leather subjected to alkaline treatment and historical samples suggesting similar deterioration patterns.…”

Section: Py-gc/ms Resultssupporting

confidence: 75%

“…They established that the most intense 2,5-diketopiperazine (DKP) peaks in the chromatogram correspond to cyclo(proline-glycine), cyclo(proline-proline) and cyclo(prolinehypdroxyproline). Marcilla and co-workers [19] studied the effect of NaOH treatment on the thermal decomposition of leather wastes tanned using various tanning agents. They found decreased thermal stability and wider temperature range of decomposition on the NaOH-treated samples by TGA method.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal characterization of new, artificially aged and historical leather and parchment

Sebestyén

Czégény

Badea

et al. 2015

Journal of Analytical and Applied Pyrolysis

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Section: Py-gc/ms Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Thermal characterization of new, artificially aged and historical leather and parchment

Sebestyén

Czégény

Badea

et al. 2015

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

“…Valorile T (Tabelul 3) scad de la max 324,1 la 312,3°C, iar ÄT este 11,8°C în timpul max procesului de îmbãtrânire. Modificarea structurii pielii dupã tratamentul cu ploaie acidã artificialã poate reduce temperatura de descompunere ºi, în consecinþã, stabilitatea termicã a pielii [15].…”

Section: Sem Analysisunclassified

“…The values of the T (Table 3) decrease from 324.1 to 312.3°C and max ÄT is 11.8°C during the aging process. The max modification of leather structure after artificial acid rain treatment can reduce the decomposition temperature and consequently reduce the thermal stability of leather [15].…”

mentioning

confidence: 99%

Effect of Artificial Acid Rain on Aluminium Tanned Leather

Gao¹,

Yang²,

Jian³

et al. 2015

LFJ

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EFFECT OF ARTIFICIAL ACID RAIN ON ALUMINIUM TANNED LEATHERABSTRACT. This article aims at studying the influence of gaseous pollutants on aluminium tanned leather. Artificial acid rain was used to soak the aluminium tanned collagen materials for 0, 4, 8, 12 and 16 days, then some analytical techniques were used to evaluate the changes of leather during the aging process. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influence of artificial acid rain on thermal behaviors. Scanning electron microscope(SEM) was used to investigate the changes of fibrous morphology during aging process. Fourier transform infrared spectroscopy (FT-IR) was used to investigate the changes of structural property after artificial acid rain treatment. With the extension of aging time, thermal stability and heat resistance were gradually reduced, including shrinkage temperature, thermal denaturing temperature, associated enthalpy, weight loss and temperature for maximum decomposition rate. SEM images showed that the collagen fibers were greatly damaged, the gaps among fibres were disappeared and the fibre bundles were randomly ruptured with the aging time. The FT-IR results showed that, during the aging process, amide A band was moved to higher numbers, amide I and amide II band of collagen were gradually shifted to lower numbers. Consequently, the structure and performance of aluminium tanned leather were damaged by artificial acid rain and the longer the aging time is, the greater the damage is. KEY WORDS: leather making; aluminium tanned leather; artificial acid rain; aging INFLUENTA PLOII ACIDE ARTIFICIALE ASUPRA PIELII TABACITE CU ALUMINIU REZUMAT. Obiectivul acestui articol este acela de a studia influenta poluantilor gazosi asupra pielii tabacite cu aluminiu. S-a utilizat ploaia acida artificiala pentru a înmuia materialul colagenic tabacit cu aluminiu timp de 0, 4, 8, 12 si 16 zile, apoi s-au efectuat anumite analize pentru a evalua modificarile pielii în timpul procesului de îmbatrânire. S-au utilizat tehnicile Micro Hot Table (MHT), calorimetria cu scanare diferentiala (DSC) si termogravimetria (TG) pentru a evalua influenta ploii acide artificiale asupra comportamentului termic. Microscopia electronica de baleiaj (SEM) a fost utilizata pentru a investiga modificarile morfologiei fibroase în timpul procesului de îmbatrânire. Spectroscopia în infrarosu cu transformata Fourier (FT-IR) a fost utilizata pentru a investiga modificarile proprietatilor structurale dupa tratamentul cu ploaie acida artificiala. Odata cu prelungirea timpului de îmbatrânire, stabilitatea termica si rezistenta la caldura s-au redus treptat, inclusiv temperatura de contractie, temperatura de denaturare termica, entalpia asociata, pierderea în greutate si temperatura ratei maxime de descompunere. Imaginile SEM au aratat ca fibrele de colagen au fost foarte deteriorate, golurile dintre fibre au disparut, iar fasciculele de fibre s-au rupt în mod aleatoriu, odata cu prelungirea timpului de îmbat...

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“…Temperatura de contracþie a pielii este un indicator valoros al stabilitãþii hidrotermice a colagenului, T în scãdere reprezentând scãderea s stabilitãþii hidrotermice [11]. The modification of leather structure after UV irradiation can reduce the decomposition temperature, and consequently reduce the thermal stability of the leather [18].…”

Section: Temperatura De Contracþieunclassified

Effect of UV Irradiation on Vegetable Tanned Leather

Gao¹,

Yang²,

Jian³

et al. 2015

LFJ

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EFFECT OF UV IRRADIATION ON VEGETABLE TANNED LEATHERABSTRACT. This article aims at studying the influence of UV irradiation on vegetable tanned leather. Vegetable tanned leather was treated in QUV chamber (T = 50°C, 2 irradiance = 1.77 W/mm nm, ë = 340 nm) for 0, 30, 60, 90, 120 and 150 hours. Then, these samples were evaluated by different analytical methods to get a whole UVA picture of the leather during the irradiation. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influences of UV irradiation on thermal behaviors. Damages to mechanical properties were also analyzed by a standard method. Fourier transform infrared spectroscopy (FT-IR) and optical microscopy were used to investigate the changes of structural and histological properties during aging process. With the extension of aging time, thermal stability was gradually reduced to lower values, including shrinkage temperature, thermal denaturation temperature, associated enthalpy and temperature for maximum decomposition rate. In addition, mechanical properties such as tensile strength, tear strength and elongation at break also gradually decreased. The FT-IR results showed that, during the aging process, amide I and amide II band of the tanned collagen gradually shifted to lower numbers, indicating an increasingly serious damage to the structure of the peptide chain, that corresponds to obvious fibril breakages which are also detected through optical microscopy. KEY WORDS: UV irradiation, vegetable tanned leather, aging INFLUENÞA IRADIERII UV ASUPRA PIELII TÃBÃCITE VEGETAL REZUMAT. Acest articol urmãreºte studiul influenþei iradierii UV asupra pielii tãbãcite vegetal. Pielea tãbãcitã vegetal a fost tratatã în camera QUV (T = 50°C, iradiere 2 = 1,77 W/mm nm, ë = 340 nm) timp de 0, 30, 60, 90, 120 ºi 150 de ore. Apoi, aceste probe au fost evaluate prin diferite metode analitice pentru a obþine o imagine UVA de ansamblu a pielii în timpul iradierii. S-au utilizat microplaca încãlzitã (MHT), calorimetria cu scanare diferenþialã (DSC) ºi termogravimetria (TG) pentru a evalua influenþele iradierii UV asupra comportamentului termic. Deteriorarea proprietãþilor mecanice a fost, de asemenea, analizatã utilizând o metodã standard. S-au utilizat spectroscopia în infraroºu cu transformatã Fourier (FT-IR) ºi microscopia opticã pentru a investiga modificãrile proprietãþilor structurale ºi histologice în timpul procesului de îmbãtrânire. Cu prelungirea timpului de îmbãtrânire, stabilitatea termicã a fost redusã treptat la valori mai mici, inclusiv temperatura de contracþie, temperatura de denaturare termicã, entalpia asociatã ºi temperatura vitezei maxime de descompunere. În plus, proprietãþi mecanice precum rezistenþa la rupere, rezistenþa la sfâºiere ºi alungirea la rupere au scãzut treptat. Rezultatele FT-IR au arãtat cã, în timpul procesului de îmbãtrânire, benzile amidã I ºi amidã II ale colagenului tãbãcit s-au deplasat treptat la numere de undã mai mici, indicând o deteriorare mai serioasã a stru...

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Study of the influence of NaOH treatment on the pyrolysis of different leather tanned using thermogravimetric analysis and Py/GC–MS system

Cited by 35 publications

References 20 publications

Thermal characterization of new, artificially aged and historical leather and parchment

Thermal characterization of new, artificially aged and historical leather and parchment

Effect of Artificial Acid Rain on Aluminium Tanned Leather

Effect of UV Irradiation on Vegetable Tanned Leather

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