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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titlePoly(vinyl alcohol) and poly(vinyl pyrrolidone) blends: Miscibility, microheterogeneity and free volume changept_BR
dc.contributor.authorCassu, SNpt_BR
dc.contributor.authorFelisberti, MIpt_BR
unicamp.authorUNIV ESTADUAL CAMPINAS,INST QUIM,BR-13083970 CAMPINAS,SP,BRAZILpt_BR
dc.subjectmiscibilitypt_BR
dc.subjectfree volumept_BR
dc.subjectmicroheterogeneitypt_BR
dc.subject.wosPoly(n-vinyl-2-pyrrolidone) Blendspt_BR
dc.subject.wosOrientationpt_BR
dc.subject.wosBehaviorpt_BR
dc.description.abstractBlends of crystallizable poly(vinyl alcohol) (PVA) with poly(vinyl pyrrolidone) (PVP) were studied by differential scanning calorimetry (d.s.c.). PVA with different degrees of hydrolysis (88 and 99 wt%) and PVP with different molecular weights (10 000 and 360 000 g mol(-1)) were used. The blends exhibited a single glass transition, as determined by d.s.c., suggesting the miscibility of the system over the whole composition range studied. The enthalpy of fusion (Delta H-f), as well as the glass transition temperature (T-g), heat capacity (Delta C-p) and glass transition width (Delta w), were also determined by d.s.c. These parameters changed with the degree of hydrolysis of PVA, PVP molecular weight and blend composition. The behaviour of Delta C-p vs blend composition was complex for the different pairs of blends, suggesting strong interaction between PVA and PVP. From the analysis of Delta w dependence on blend composition we concluded that blends containing PVP of 10 000 g mol(-1) exhibit a larger number of relaxations than blends containing high molecular weight PVP, indicating that the density of interactions is larger in the former. (C) 1997 Elsevier Science Ltd.pt
dc.relation.ispartofPolymerpt_BR
dc.relation.ispartofabbreviationPolymerpt_BR
dc.publisher.cityOxfordpt_BR
dc.publisher.countryInglaterrapt_BR
dc.publisherElsevier Sci Ltdpt_BR
dc.date.issued1997pt_BR
dc.date.monthofcirculationJULpt_BR
dc.identifier.citationPolymer. Elsevier Sci Ltd, v. 38, n. 15, n. 3907, n. 3911, 1997.pt_BR
dc.language.isoenpt_BR
dc.description.volume38pt_BR
dc.description.issuenumber15pt_BR
dc.description.firstpage3907pt_BR
dc.description.lastpage3911pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policypt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0032-3861pt_BR
dc.identifier.wosidWOS:A1997XH53600024pt_BR
dc.identifier.doi10.1016/S0032-3861(96)00959-7pt_BR
dc.date.available2014-12-16T11:35:17Z
dc.date.available2015-11-26T18:04:31Z-
dc.date.accessioned2014-12-16T11:35:17Z
dc.date.accessioned2015-11-26T18:04:31Z-
dc.description.provenanceMade available in DSpace on 2014-12-16T11:35:17Z (GMT). No. of bitstreams: 1 WOSA1997XH53600024.pdf: 466390 bytes, checksum: 432478d88ab85140263c672331217176 (MD5) Previous issue date: 1997en
dc.description.provenanceMade available in DSpace on 2015-11-26T18:04:31Z (GMT). No. of bitstreams: 2 WOSA1997XH53600024.pdf: 466390 bytes, checksum: 432478d88ab85140263c672331217176 (MD5) WOSA1997XH53600024.pdf.txt: 19890 bytes, checksum: df62cce82f2d20c4ff38e74bc0f5473e (MD5) Previous issue date: 1997en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/81407pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/81407
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/81407-
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