Publication
New bacterial cellulose nanocomposites prepared by in situ radical polymerization of methacrylate monomers
| datacite.subject.fos | Engenharia e Tecnologia::Engenharia Química | pt_PT |
| datacite.subject.fos | Ciências Naturais::Ciências Biológicas | pt_PT |
| dc.contributor.advisor | Cordeiro, Nereida Maria Abano | |
| dc.contributor.advisor | Barros, Carmen Sofia da Rocha Freire | |
| dc.contributor.author | Faria, Marisa Camacho Gonçalves | |
| dc.date.accessioned | 2016-05-04T15:39:23Z | |
| dc.date.available | 2016-06-04T00:30:08Z | |
| dc.date.issued | 2015-09 | |
| dc.description.abstract | Bacterial cellulose/polymethacrylate nanocomposites have received attention in numerous areas of study and in a variety of applications. The attractive properties of methacrylate polymers and bacterial cellulose, BC, allow the synthesis of new nanocomposites with distinct characteristics. In this study, BC/poly(glycidylmethacrylate) (BC/PGMA) and BC/poly(ethyleneglycol)methacrylate (BC/PPEGMA) nanocomposites were prepared through in situ free radical polymerization of GMA and PEGMA, respectively. Ammonium persulphate (APS) was used as an initiator and N,N’methylenebisacrilamide (MBA) was used as a crosslinker in BC/PGMA. Chemical composition, morphology, thermal stability, water absorption, mechanic and surface properties were determined through specific characterization techniques. The optimal polymerization was obtained at (1:2) for BC/PGMA, (1:2:0.2) ratio for BC/GMA/MBA and (1:20) for BC/PPEGMA, with 0.5% of initiator at 60 ºC during 6 h. A maximum of 67% and 87% of incorporation percentage was obtained, respectively, for the nanocomposites BC/PGMA/MBA and BC/PPEGMA. BC/PGMA nanocomposites exhibited an increase of roughness and compactation of the three-dimensional structure, an improvement in the thermal and mechanical properties, and a decrease in their swelling ability and crystallinity. On the other hand, BC/PPEGMA showed a decrease of stiffness of three-dimensional structure, improvement in thermal and mechanical properties, an increase in their swelling ability and a decrease the crystallinity. Both BC/polymethacrylate nanocomposites exhibited a basic surface character. The acid treatment showed to be a suitable strategy to modifiy BC/PGMA nanocomposites through epoxide ring-opening reaction mechanism. Nanocomposites became more compact, smooth and with more water retention ability. A decrease in the thermal and mechanical proprieties was observed. The new nanocomposites acquired properties useful to biomedical applications or/and removal of heavy metals due to the presence of functional groups. | pt_PT |
| dc.description.sponsorship | Universidade de Aveiro | pt_PT |
| dc.identifier.tid | 201132168 | |
| dc.identifier.uri | http://hdl.handle.net/10400.13/1151 | |
| dc.language.iso | eng | pt_PT |
| dc.subject | Bioquímica aplicada | pt_PT |
| dc.subject | Nanoestruturas | pt_PT |
| dc.subject | Nanotecnologia | pt_PT |
| dc.subject | Substâncias e sistemas químicos | pt_PT |
| dc.subject | Tipos específicos de compostos químicos | pt_PT |
| dc.subject | Celulose bacteriana | pt_PT |
| dc.subject | Bacterial cellulose | pt_PT |
| dc.subject | Nanocomposite | pt_PT |
| dc.subject | in situ radical polymerization | pt_PT |
| dc.subject | Glycidylmethacrylate | pt_PT |
| dc.subject | Poly(ethyleneglycol)methacrylate | pt_PT |
| dc.subject | Chemical treatment | pt_PT |
| dc.subject | Applied Biochemistry | pt_PT |
| dc.subject | . | pt_PT |
| dc.subject | Faculdade de Ciências Exatas e da Engenharia | pt_PT |
| dc.title | New bacterial cellulose nanocomposites prepared by in situ radical polymerization of methacrylate monomers | pt_PT |
| dc.type | master thesis | |
| dspace.entity.type | Publication | |
| person.familyName | Faria | |
| person.givenName | Marisa Camacho Gonçalves | |
| person.identifier.ciencia-id | D716-6F48-AD0E | |
| person.identifier.orcid | 0000-0002-9158-6961 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | masterThesis | pt_PT |
| relation.isAuthorOfPublication | 57ef72f0-8e40-4853-b4ab-416884e127fa | |
| relation.isAuthorOfPublication.latestForDiscovery | 57ef72f0-8e40-4853-b4ab-416884e127fa | |
| thesis.degree.name | Tese apresentada à Universidade da Madeira com vista à obtenção do grau de Mestre em Bioquímica Aplicada | pt_PT |