Accueil
Détail de l'auteur
Auteur Edward H. Harris |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Chemical modification of collagen for improved chrome tannage / Stephen H. Feairheller in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIII (Année 1988)
[article]
Titre : Chemical modification of collagen for improved chrome tannage Type de document : texte imprimé Auteurs : Stephen H. Feairheller, Auteur ; Maryann M. Taylor, Auteur ; Edward H. Harris, Auteur Année de publication : 1988 Article en page(s) : p. 363-371 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome salts are known to tan by bonding with collagen's side chain carboxyl groups as the primary sites for the crosslinking. As part of a basic study to develop chrome-sparing tannage, additional carboxyl groups have been added to collagen by use of the Michael Reaction.Under these conditions, beta-carboxyethyl acrylate was covalently bonded to existing free amino side chains of collagen. This resulted in a significant improvement in chrome tanning. With equal chrome offerings, the treated hide samples showed lysine and hydroxylysine losses indicating that these amino acid residues are the sites of the reaction with collagen. Physical properties of the leather were determined. En ligne : https://drive.google.com/file/d/1w7pAyA4kthnWevu7pWQhbCMjW0KYccsV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8951
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIII (Année 1988) . - p. 363-371[article]Réservation
Réserver ce documentCorrelation of differential thermal analysis data with the shrinkage temperature of collagen and leather / J. Naghski in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXI (Année 1966)
[article]
Titre : Correlation of differential thermal analysis data with the shrinkage temperature of collagen and leather Type de document : texte imprimé Auteurs : J. Naghski, Auteur ; A. Wisnewski, Auteur ; Edward H. Harris, Auteur ; Lee P. Witnauer, Auteur Année de publication : 1966 Article en page(s) : p. 64-74 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Collagène -- Analyse
Statistique
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Shrinkage temperture data obtained on suspended specimens of raw hide substance and a variety of commercial leathers are compared with values obtained by measuring the thermodynamic changes using differential thermal analysis. In every instance the correlation between the data of these two methods was statistically highly significant, and it is concluded that they measure the same basic phenomenon. It is suggested that the absolute values for the phase transition measured by DTA be used at the reference for the thermal behavior of collagen and its products. Use of suspended specimens offers a simplified procedure, which could be defined as a method for the measurement of shrinkage temperatures. The use of pressurized equipment permitted the extension of the temperature range to include products shrinking above the boiling point of water (100°C). Note de contenu : - Instrumentation
- Sample preparation
- Typical leather-water thermogram
- Table 1 : Data from DTA and suspension shrinkage temperature measurements
- Table 2 : Summary of statistical analysisEn ligne : https://drive.google.com/file/d/1SauL0CaRzgRUUDvVv4mq8YD0ZOlxD3f2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37874
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXI (Année 1966) . - p. 64-74[article]Glutaraldehyde retannage of chrome leather. Effect of ambient storage on selected properties of the leather / Edward H. Harris in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
[article]
Titre : Glutaraldehyde retannage of chrome leather. Effect of ambient storage on selected properties of the leather Type de document : texte imprimé Auteurs : Edward H. Harris, Auteur ; E. M. Filachione, Auteur Année de publication : 1975 Article en page(s) : p. 269-272 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir cabretta
Cuirs et peaux de moutons
Glutaraldéhyde
Résistance à la transpiration
Retannage
Tannage au chrome
Tannage synthétique
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Our previous studies amply demonstrated the valuable properties that glutaraldehyde imparted to leather, especially when used in combination with chrome in the tanning of hides and skins. One of the properties imparted to leather by glutaraldehyde was a markedly improved resistance to perspiration. This was true whether glutaraldehyde was used as the only tanning agent or in combination with chrome or other conventional tanning agents. We found that glutaraldehyde was used to its hest advantage following chrome tanning of leather, since many tanners sort in the blue. However, our previous publications have also shown that applying the glutaraldehyde before, or even simultaneously with, the chrome was at least equally effective.
In one of our earlier studies we investigated the effect of elevated temperatures on glutaraldehyde retannage of chrome-tanned sides. In that study the temperature was initially 63°C. and ended at 47°C. As expected, the effect of elevated temperature was to increase the rate of uptake of glutaraldehyde by the chrome-tanned side leather.
We now report the results obtained using chrome-tanned cabretta skins in a thermostatted Meissner mill. Because many post-tanning processes, such as retannage, coloring, and fat liquoring, are carried out at about 50°C., we chose this temperature for our studies on retannage of chrome leather with glutaraldehyde. The objective of this study was to determine the quantity of glutaraldehyde and the time of retannage required to attain perspiration-resistance in the chrome leather.
Note de contenu : - Substrates
- Tannage
- Shrink temperatures
- Perspiration resistance
- Table 1 : Effect of storage time on selected properties of glutaraldehyde retanned chrome skinsEn ligne : https://drive.google.com/file/d/10dgZ8zuYKVbKwT8R-oAoUgE3yAQ4j0OW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38788
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 269-272[article]Graft polymerization. IV. Further studies of the initiation step in the graft polymerization of vinyl monomers onto chrome-tanned collagen / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXII (Année 1977)
[article]
Titre : Graft polymerization. IV. Further studies of the initiation step in the graft polymerization of vinyl monomers onto chrome-tanned collagen Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Edward H. Harris, Auteur ; Stephen H. Feairheller, Auteur Année de publication : 1977 Article en page(s) : p. 294-312 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Copolymères greffés
Cuirs et peaux
polymères vinyliques
Polymérisation
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the process for the graft polymerization of vinyl monomers onto chrome-tanned collagen developed at the Eastern Regional Research Center, redox initiation with the persulfate-bisulfite combination is a key step. Various aspects of this reaction have now been examined and the results obtained permit improving the grafting and monomer conversion efficiencies. As monitored by iodometric titration, the partition of persulfate ion between water and collagen depends upon the per-sulfate ion concentration and the chrome content of the collagen. The rate of disappearance of persulfate ion from solution and the quantity absorbed increased with higher concentrations of persulfate ion or chrome content of the collagen. The implication is that both a mass action effect and ionic attraction are involved. Similar bisulfite ion distribution results were obtained in studies with a radioactive isotope of sulfur. In addition, monomer absorption was studied with the chrome-tanned collagen. All of these studies indicated that grafting takes place f rom monomer in the aqueous phase onto free radical sites generated on the collagen by the absorbed redox initiation system. Additional studies with different reducing agents used at varying molar ratios to the persulfate ion clearly indicated an optimum ratio which gave both maximum monomer to polymer conversion and grafting. The persulfate-bisulfite combination still appears to he the best. Note de contenu : - EXPERIMENTAL : Materials - Chrome tanning and analyses - Depickling procedure - Persulfate partition study - Bisulfite partition procedure - Free radical partition study - Graft polymerization on stock containing various amounts of CrO3 - Monomer partition
- RESULTS AND DISCUSSION : Persulfate ion partition - Sodium bisulfite partition studies - Various reductants and molar ratio studies - Identification of the method of graft formation - Chrome-graft polymerization study - Monomer partition study
- Table 1 : Cr2O3 fixed by untreated skins
- Table 2 : 35S-tagged NaHSO3 partition study
- Table 3 : Reducing systems and molar ratios studied
- Table 4 : Effect of free radical partition on polymer analysis
- Table 4 : Effect of chrome content on polymer content of grafted leatherEn ligne : https://drive.google.com/file/d/19vEmOZqyns4hwa2KvTEQth101xN3GPsU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38264
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXII (Année 1977) . - p. 294-312[article]Graft polymerization. IX. Improved distribution of grafted polymers in side leather / M. M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
[article]
Titre : Graft polymerization. IX. Improved distribution of grafted polymers in side leather Type de document : texte imprimé Auteurs : M. M. Taylor, Auteur ; Mary V. Hannigan, Auteur ; Edward H. Harris, Auteur Année de publication : 1981 Article en page(s) : p. 245-255 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although sheepskins and cattlehides have the same chemical composition, they differ in physical characteristics. Sheepskins are thinner than cattlehides and their structure is more open. Thus, graft polymerization techniques that were highly effective on sheepskins gave poor stratigraphic polymer distribution in cattlehides. Poor polymer distribution appeared as a sandwich effect with polymer restricted to shallow layers near each surface. Good polymer distribution more nearly resembled a fatliquored skin in that polymer was present throughout the skin, but in lesser amounts in the midcorium than at at the grain and flesh surfaces. Study of the factor affecting the rate and completeness of persulfate ion penetration into sides in the blue led to means of greatly improving the polymer distribution. The depth of penetration by persulfate ion, visually determined when starch/iodide solution was applied to cut edges of the treated chrome stock, depended upon the concentration of the persulfate ion and length of treatment. This absorbed ion was not readily extractable with water and could be used in a separate step as part of the redox couple to initiate the graft polymerization. The stratigraphic distribution of the polymer in the products was determined in stained sections examined by light microscopy. Chemical analyses were used to determine the total and bound polymer content of the grafted leathers. Note de contenu : - INTRODUCTION : Materials - Histological methods - Chemical analysis
- RESULTS AND DISCUSSION : Absorption and distribution of persulfate - Grafting - Effect of storage on pretreated stock - Histology - finishing of grafted leathersEn ligne : https://drive.google.com/file/d/1ocaKQe-p2QVBoCDarGnXPddSmHdlsKWV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17650
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 245-255[article]Graft polymerization VI. Studies on proof of grafting and molecular weights of the isolated poly(methyl methacrylate) grafts / Helen A. Gruber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)
PermalinkGraft polymerization VII. Novel source of reductant for graft polymerization of leather / Edward H. Harris in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
PermalinkGraft polymerization VIII. Effect of changes in the initiating system on the molecular weight of the graft copolymer in polyretanned leather / Helen A. Gruber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)
PermalinkRadiation cured coatings for leather / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
Permalink