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dc.contributor.CRUESPUniversidade Estadual de Campinaspt
dc.typeArtigo de periódicopt
dc.titleAction of silylating agents on a chrysotile surface and subsequent reactions with 2-pyridine and 2-thiophene carbaldehydespt
dc.contributor.authorda Fonseca, MGpt
dc.contributor.authorAiroldi, Cpt
unicamp.authorUniv Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazilpt
dc.subject.wosImmobilized Bakers-yeastpt
dc.subject.wosDivalent-cationspt
dc.subject.wosSilica-gelpt
dc.subject.wosAsbestospt
dc.subject.wosFiberspt
dc.subject.wosChemisorptionpt
dc.subject.wosReductionpt
dc.subject.wosCatalystspt
dc.subject.wosProductspt
dc.subject.wosAminespt
dc.description.abstractChrysotile fibres have been modified in two distinct steps: first, the fibers were aminated with silylating agents such as 3-aminopropyltrimethoxysilane or N-[3-( trimethoxysilyl)propyl] ethylenediamine to give the products denoted CRI1 and CRI2, respectively. In the second step, these matrices reacted readily with 7-pyridine and 2-thiophene carbaldehydes to form C=N bonds, characteristic of a Schiff base. All immobilized materials were characterized by elemental analysis, IR spectroscopy, thermogravimetry, solid state Si-29 NMR, surface area measurements and X-ray diffractometry. Nitrogen elemental analysis indicated the presence of 1.20 and 2.87 mmol g(-1) of pendant groups on CRI1 and CRI2 surfaces, respectively. The experimental C/N ratios are 3.14, 2.90, 3.14 and 4.49 for modified materials CRI1L(1), CRI1L(2), CRI2L(1) and CRI2L(2), respectively. These results are in agreement with the yields of the successive reaction steps. The original chrysotile structure was maintained for the aminated modified surfaces. The surface area of prepared materials decreased with functionalization to values of < 5.0 m(2) g(-1). All matrices obtained from reaction with aldehydes showed a C=N band at 1636 cm(-1), which is related to Schiff bond formation. Products derived from the reaction with pyridine carbaldehyde showed bands associated with aromatic and aliphatic C-H stretching bands at 3050 and 2930 cm(-1), respectively and pairs of bands at 1590, 1570 and 1470, 1436 cm(-1) are attributed to aromatic v(C=C). These results indicate that the silylating agents are covalently bonded to the chrysotile surface.pt
dc.relation.ispartofJournal Of Materials Chemistrypt_BR
dc.relation.ispartofabbreviationJ. Mater. Chem.pt
dc.publisher.cityCambridgept
dc.publisher.countryInglaterrapt
dc.publisherRoyal Soc Chemistrypt
dc.date.issued1999pt
dc.date.monthofcirculationJUNpt
dc.identifier.citationJournal Of Materials Chemistry. Royal Soc Chemistry, v. 9, n. 6, n. 1375, n. 1380, 1999.pt
dc.language.isoenpt
dc.description.volume9pt
dc.description.issuenumber6pt
dc.description.initialpage1375pt
dc.description.lastpage1380pt
dc.rightsabertopt
dc.sourceWeb of Sciencept
dc.identifier.issn0959-9428pt
dc.identifier.wosidWOS:000080881800027pt
dc.identifier.doi10.1039/a807383jpt
dc.date.available2014-12-02T16:27:20Z
dc.date.available2015-11-26T17:56:38Z-
dc.date.accessioned2014-12-02T16:27:20Z
dc.date.accessioned2015-11-26T17:56:38Z-
dc.description.provenanceMade available in DSpace on 2014-12-02T16:27:20Z (GMT). No. of bitstreams: 1 WOS000080881800027.pdf: 161365 bytes, checksum: 47e1a0c5953d4ea64c4b654e44bb16c5 (MD5) Previous issue date: 1999en
dc.description.provenanceMade available in DSpace on 2015-11-26T17:56:38Z (GMT). No. of bitstreams: 2 WOS000080881800027.pdf: 161365 bytes, checksum: 47e1a0c5953d4ea64c4b654e44bb16c5 (MD5) WOS000080881800027.pdf.txt: 24576 bytes, checksum: dac83c686f5a538c41d2305c4e8b4c19 (MD5) Previous issue date: 1999en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/54144pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/54144
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/54144-
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