Phase behavior of binary blends of high molecular weight diblock copolymers with a low molecular weight triblock
| dc.contributor.author | Mickiewicz, R. A. | en |
| dc.contributor.author | Ntoukas, E. | en |
| dc.contributor.author | Avgeropoulos, A. | en |
| dc.contributor.author | Thomas, E. L. | en |
| dc.date.accessioned | 2015-11-24T17:37:13Z | |
| dc.date.available | 2015-11-24T17:37:13Z | |
| dc.identifier.issn | 0024-9297 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/14328 | |
| dc.rights | Default Licence | - |
| dc.subject | order-disorder transition | en |
| dc.subject | styrene isoprene 2-block | en |
| dc.subject | block-copolymers | en |
| dc.subject | 3-block copolymers | en |
| dc.subject | forming copolymers | en |
| dc.subject | strong segregation | en |
| dc.subject | parameter space | en |
| dc.subject | mixtures | en |
| dc.subject | temperature | en |
| dc.subject | dependence | en |
| dc.title | Phase behavior of binary blends of high molecular weight diblock copolymers with a low molecular weight triblock | en |
| heal.abstract | Binary blends of four different high molecular weight poly (styrene-b-isoprene) (SI) diblock copolymers with a lower molecular weight poly(styrene-b-isoprene-b-styrene) (SIS) triblock copolymer were prepared, and their morphology was characterized by transmission electron microscopy and ultra-small-angle X-ray scattering. All the neat block copolymers have nearly symmetric composition and exhibit the lamellar morphology. The SI diblock copolymers had number-average molecular weights, (M) over bar (n), in the range 4.4 x 10(5)-1.3 x 10(6) g/mol and volume fractions of poly(styrene), Phi(PS), in the range 0.43-0.49, and the SIS triblock had a molecular weight of (M) over bar (n) similar to 6.2 x 10(4) g/mol with Phi(PS) = 0.41. The high molecular weight diblock copolymers are very strongly segregating, with interaction parameter values, chi N, in the range 470-1410. A morphological phase diagram in the parameter space of molecular weight ratio (R = M(n)(diblock)/1/2M(n)(triblock)) and blend composition was constructed, with R values in the range between 14 and 43, which are higher than previously reported. The phase diagram revealed a large miscibility gap for the blends, with macrophase separation into two distinct types of microphase-separated domains for weight fractions of SI, w(SI) < 0.9, implying virtually no solubility of the much higher molecular weight diblocks in the lower molecular weight triblock. For certain blend compositions, above R similar to 30, morphological transitions from the lamellar to cylindrical and bicontinuous structures were also observed. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1021/Ma801022k | - |
| heal.identifier.secondary | <Go to ISI>://000258226200038 | - |
| heal.identifier.secondary | http://pubs.acs.org/doi/pdfplus/10.1021/ma801022k | - |
| heal.journalName | Macromolecules | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2008 | - |
| heal.publisher | American Chemical Society | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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