dc.contributor.author | Siljanovska Petreska, Gordana | |
dc.contributor.author | Arbe Méndez, María Aranzazu | |
dc.contributor.author | Auschra, Clemens | |
dc.contributor.author | Paulis Lumbreras, María | |
dc.date.accessioned | 2020-01-17T13:31:28Z | |
dc.date.available | 2020-01-17T13:31:28Z | |
dc.date.issued | 2019-08 | |
dc.identifier.citation | Polymers 11(8) : (2019) // Article ID 1259 | es_ES |
dc.identifier.issn | 2073-4360 | |
dc.identifier.uri | http://hdl.handle.net/10810/38603 | |
dc.description.abstract | High molecular weight waterborne ABA block copolymers of styrene (St) and 2-ethylhexyl acrylate (2EHA) containing hard and soft domains were synthesized by means of RAFT (mini)emulsion polymerization using a bifunctional symmetric S,S-dibenzyl trithiocarbonate (DBTTC) RAFT agent. Miniemulsion polymerization was initially used for the synthesis of the A-block, which forms hard domains, followed by 2EHA pre-emulsion feeding to build the B-block soft domains. Polymerization kinetics and the evolution of the Molecular Weight Distribution (MWD) were followed during the synthesis of different ABA block copolymers. The thermal properties of the final symmetric block copolymers were studied on dried films by means of DSC. It was found that the block copolymers have two glass transitions, which indicates the presence of a two-phase system. Phase separation was investigated by means of microscopic techniques (AFM and TEM) and SAXS, both of the particles in the latex form, as well as after film formation at room temperature and after different post-treatments. Films were annealed at temperatures well above the glass transition temperature (T-g) of the hard phase to study the bulk morphology of the films after complete particle coalescence. Moreover, for comparison purposes, the films were re-dissolved in THF, and films were again cast directly from the homogeneous THF solutions. As THF is a good solvent for both blocks, such films serve as a reference for the equilibrium morphology. Finally, DMTA studies of the films annealed at different temperatures were performed to correlate the morphology changes with the mechanical properties of the block | es_ES |
dc.description.sponsorship | The European Union's Horizon 2020 research and innovation programme is acknowledged for providing the financial support through the project TRACKWAY-ITN 642514 under the Marie Sklodowska-Curie grant agreement. Authors are thankful to Ute Heinemer (SEM and TEM lab BASF) for the TEM measurements and discussions and Katja Graf (AFM lab BASF) for the discussion of the AFM images. A.A. acknowledges financial support of the Basque Government, code: IT-1175-19 and the Ministerio de Economia y Competitividad code: PGC2018-094548-B-I00 (MINECO/FEDER, UE). | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/642514 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/PGC2018-094548-B-I00 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.subject | RAFT | es_ES |
dc.subject | miniemulsion polymerization | es_ES |
dc.subject | ABA hard-soft-hard block copolymers | es_ES |
dc.subject | particle and film morphology | es_ES |
dc.subject | films viscoelastic properties | es_ES |
dc.subject | temperature responsiveness | es_ES |
dc.subject | free-radical polymerization | es_ES |
dc.subject | emulsion polymerization | es_ES |
dc.subject | butyl acrylate | es_ES |
dc.subject | polystyrene | es_ES |
dc.subject | particles | es_ES |
dc.subject | styrene | es_ES |
dc.subject | latex | es_ES |
dc.title | Mechanical and Morphological Properties of Waterborne ABA Hard-Soft-Hard Block Copolymers Synthesized by Means of RAFT Miniemulsion Polymerization | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited | es_ES |
dc.rights.holder | Atribución 3.0 España | * |
dc.relation.publisherversion | https://www.mdpi.com/2073-4360/11/8/1259 | es_ES |
dc.identifier.doi | 10.3390/polym11081259 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Química aplicada | es_ES |
dc.departamentoeu | Kimika aplikatua | es_ES |