| dc.creator | de Andrade, ML | |
| dc.creator | Atvars, TDZ | |
| dc.date | 2004 | |
| dc.date | 11263 | |
| dc.date | 2014-11-18T02:26:20Z | |
| dc.date | 2015-11-26T17:45:26Z | |
| dc.date | 2014-11-18T02:26:20Z | |
| dc.date | 2015-11-26T17:45:26Z | |
| dc.date.accessioned | 2018-03-29T00:27:47Z | |
| dc.date.available | 2018-03-29T00:27:47Z | |
| dc.identifier | Macromolecules. Amer Chemical Soc, v. 37, n. 24, n. 9096, n. 9108, 2004. | |
| dc.identifier | 0024-9297 | |
| dc.identifier | WOS:000225371200040 | |
| dc.identifier | 10.1021/ma049265e | |
| dc.identifier | http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/59671 | |
| dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/59671 | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/59671 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1288182 | |
| dc.description | The morphology of blends of poly(alkyl methaerylate-co-styrene)/polystyrene [XMAS/PS; X = M (methyl), E (ethyl)] was studied at the microscopic level (micrometric scale) by differential scanning calorimetry (DSC), dynamic-mechanical analysis (DMA), and epifluorescence microscopy (EFM) and at the nanoscopic scale by steady-state and time-resolved fluorescence emission spectroscopy (FES). Time-resolved energy transfer analysis was used to probe the interpenetration of molecular chains. The copolymers MMAS and EMAS (approximate content in mol %: 78% of methacrylate units; 22% of styrene units) covalently labeled with 9-vinylanthracene units (less than or equal to0.1%), as fluorescent comonomer (fluorophore), were synthesized by emulsion polymerization and were characterized by FTIR, H-1 NMR, C-13 NMR, TGA, GPC, DSC, DMA, UV-vis, and FES. Films of copolymer blends were prepared by casting from dilute chloroform solutions with compositions of 5, 20, 50, 80, and 95 wt % of copolymer. Some miscibility was observed for the blends of XMAS/PS containing 5, 20, and 95 wt % of copolymer. Interaction strength in blends increased with the size of aliphatic chain of the ester group in the copolymer. Blends with 50 wt % of copolymer are always immiscible. Two values of glass transition temperatures were observed by DSC and DMTA. MMAS/PS and EMAS/PS blends of copolymer-richer compositions (95 and 80 wt %) show fluorescence lifetimes with broader distributions, suggesting a wider distance distribution of interlumophoric groups. | |
| dc.description | 37 | |
| dc.description | 24 | |
| dc.description | 9096 | |
| dc.description | 9108 | |
| dc.language | en | |
| dc.publisher | Amer Chemical Soc | |
| dc.publisher | Washington | |
| dc.publisher | EUA | |
| dc.relation | Macromolecules | |
| dc.relation | Macromolecules | |
| dc.rights | fechado | |
| dc.source | Web of Science | |
| dc.subject | Fluorescence Lifetime Distributions | |
| dc.subject | Field Optical Microscopy | |
| dc.subject | Light-emitting-diodes | |
| dc.subject | Energy-transfer | |
| dc.subject | Polymer Blends | |
| dc.subject | Poly(2,6-dimethyl-1,4-phenylene Oxide) | |
| dc.subject | Poly(methyl Methacrylate) | |
| dc.subject | Secondary Relaxation | |
| dc.subject | Phase-separation | |
| dc.subject | Block-copolymer | |
| dc.title | Photophysical study in blends of poly(alkyl methacrylate-co-styrene)/polystyrene | |
| dc.type | Artículos de revistas | |
