Publicação
Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization
| Resumo: | Poly(vinyl alcohol) (PVA) hydrogels were obtained by freezing (-22 °C) and thawing (+25 °C) process, resulting in a semi-interpenetrating polymer network (s-IPN) with a sulfonated polyester (PES). The cryo-gels samples were analysed in terms of its water uptake capacity (WU) as a function of pH, temperature and ionic strength. WU of all samples were relatively high, and they showed a reasonable sensitivity to both pH and ionic strength. The pH- and ionic strength dependence is attributed to the dissociation of ionizable groups of PES. The degrees of crystallinity of the cryo-gels, determined by using differential scanning calorimetry (DSC), are lower than pure PVA. Besides, decrease of glass transition temperature (Tg) of the samples when compared with pure PVA was observed. This results are due interactions between PVA and PES, which lead to an increase on the amorphous content of the hydrogels. Our results show that, despite of changes in the microstructure of the hydrogels due the presence of the polyelectrolyte, the cryo-gels reveal a long-term stability. |
|---|---|
| Autores principais: | Paranhos,Caio Marcio |
| Outros Autores: | Oliveira,Renata Nunes; Soares,Bluma Guenther; Pessan,Luiz Antônio |
| Assunto: | hydrogels freezing-thawing process poly(vinyl alcohol) |
| Ano: | 2007 |
| País: | Brasil |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | IBICT |
| Idioma: | inglês |
| Origem: | Oasisbr |
| _version_ | 1871510283620450304 |
|---|---|
| author | Paranhos,Caio Marcio |
| author2 | Oliveira,Renata Nunes Soares,Bluma Guenther Pessan,Luiz Antônio |
| author2_role | author author author |
| author_facet | Paranhos,Caio Marcio Oliveira,Renata Nunes Soares,Bluma Guenther Pessan,Luiz Antônio |
| author_role | author |
| country_str | BR |
| creators_json_txt | [{\"Person.name\":\"Paranhos,Caio Marcio\"},{\"Person.name\":\"Oliveira,Renata Nunes\"},{\"Person.name\":\"Soares,Bluma Guenther\"},{\"Person.name\":\"Pessan,Luiz Antônio\"}] |
| datacite.creators.creator.creatorName.fl_str_mv | Paranhos,Caio Marcio Oliveira,Renata Nunes Soares,Bluma Guenther Pessan,Luiz Antônio |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | hydrogels freezing-thawing process poly(vinyl alcohol) |
| datacite.titles.title.fl_str_mv | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| dc.creator.none.fl_str_mv | Paranhos,Caio Marcio Oliveira,Renata Nunes Soares,Bluma Guenther Pessan,Luiz Antônio |
| dc.format.none.fl_str_mv | text/html |
| dc.identifier.none.fl_str_mv | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100010 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | ABM, ABC, ABPol |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.source.none.fl_str_mv | Materials Research v.10 n.1 2007 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
| dc.subject.none.fl_str_mv | hydrogels freezing-thawing process poly(vinyl alcohol) |
| dc.title.fl_str_mv | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | Poly(vinyl alcohol) (PVA) hydrogels were obtained by freezing (-22 °C) and thawing (+25 °C) process, resulting in a semi-interpenetrating polymer network (s-IPN) with a sulfonated polyester (PES). The cryo-gels samples were analysed in terms of its water uptake capacity (WU) as a function of pH, temperature and ionic strength. WU of all samples were relatively high, and they showed a reasonable sensitivity to both pH and ionic strength. The pH- and ionic strength dependence is attributed to the dissociation of ionizable groups of PES. The degrees of crystallinity of the cryo-gels, determined by using differential scanning calorimetry (DSC), are lower than pure PVA. Besides, decrease of glass transition temperature (Tg) of the samples when compared with pure PVA was observed. This results are due interactions between PVA and PES, which lead to an increase on the amorphous content of the hydrogels. Our results show that, despite of changes in the microstructure of the hydrogels due the presence of the polyelectrolyte, the cryo-gels reveal a long-term stability. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| id | oasisbr_d0161952e2fea9ef0ae697c6a58d1789 |
| identifier.url.fl_str_mv | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100010 |
| inst_facet_str | urn:organizationAcronym:oasisbr{{{_:::_}}}IBICT |
| instacron_str | OASISBR |
| institution | IBICT |
| instname_str | IBICT |
| language | eng |
| network_acronym_str | oasisbr |
| network_name_str | Oasisbr |
| oai_identifier_str | oai:scielo:S1516-14392007000100010 |
| organization_str_mv | urn:organizationAcronym:oasisbr |
| person_str_mv | Paranhos,Caio Marcio Oliveira,Renata Nunes Soares,Bluma Guenther Pessan,Luiz Antônio |
| publishDate | 2007 |
| publisher.none.fl_str_mv | ABM, ABC, ABPol |
| repo_facet_str | urn:repositoryAcronym:oasisbr{{{_:::_}}}Oasisbr |
| reponame_str | Oasisbr |
| repository_id_str | urn:repositoryAcronym:oasisbr |
| service_str_mv | urn:repositoryAcronym:oasisbr |
| spelling | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterizationParanhos,Caio MarcioOliveira,Renata NunesSoares,Bluma GuentherPessan,Luiz Antôniohydrogelsfreezing-thawing processpoly(vinyl alcohol)open accesshttp://purl.org/coar/access_right/c_abf2http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100010URLhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100010URLHasVersion2007-03-01Poly(vinyl alcohol) (PVA) hydrogels were obtained by freezing (-22 °C) and thawing (+25 °C) process, resulting in a semi-interpenetrating polymer network (s-IPN) with a sulfonated polyester (PES). The cryo-gels samples were analysed in terms of its water uptake capacity (WU) as a function of pH, temperature and ionic strength. WU of all samples were relatively high, and they showed a reasonable sensitivity to both pH and ionic strength. The pH- and ionic strength dependence is attributed to the dissociation of ionizable groups of PES. The degrees of crystallinity of the cryo-gels, determined by using differential scanning calorimetry (DSC), are lower than pure PVA. Besides, decrease of glass transition temperature (Tg) of the samples when compared with pure PVA was observed. This results are due interactions between PVA and PES, which lead to an increase on the amorphous content of the hydrogels. Our results show that, despite of changes in the microstructure of the hydrogels due the presence of the polyelectrolyte, the cryo-gels reveal a long-term stability.engtext/htmlABM, ABC, ABPolMaterials Research v.10 n.1 2007reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOLjournal articlehttp://purl.org/coar/resource_type/c_6501literatureVoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85 |
| spellingShingle | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization Paranhos,Caio Marcio hydrogels freezing-thawing process poly(vinyl alcohol) |
| status | SINGLETON |
| status_str | VoR |
| subject.fl_str_mv | hydrogels freezing-thawing process poly(vinyl alcohol) |
| title | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| title_full | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| title_fullStr | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| title_full_unstemmed | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| title_short | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| title_sort | Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization |
| topic | hydrogels freezing-thawing process poly(vinyl alcohol) |
| topic_facet | hydrogels freezing-thawing process poly(vinyl alcohol) |
| url | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100010 |
| visible | 1 |
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