Structure of polymer blends photo-cross-linked during the spinodal decomposition process
Anthracene-labeled polystyrene/poly(2-chlorostyrene) blends (PSA /P2CS) with the composition 40/60 were photo-cross-linked during the time evolution of the spinodal-decomposition process. Photo-cross-links were carried out by utilizing the intermolecular photodimerization reaction between anthracene...
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Published in | Macromolecules Vol. 24; no. 7; pp. 1505 - 1510 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
01.04.1991
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Subjects | |
Online Access | Get full text |
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Summary: | Anthracene-labeled polystyrene/poly(2-chlorostyrene) blends (PSA /P2CS) with the composition 40/60 were photo-cross-linked during the time evolution of the spinodal-decomposition process. Photo-cross-links were carried out by utilizing the intermolecular photodimerization reaction between anthracene groups that were chemically attached on polystyrene chains. The structure and property of these photo-cross-linked blends were examined by means of optical microscopy and dielectric relaxation. It was found that, upon irradiation with a XeF excimer laser, the ordered structures resulting from a temperature-jump (T-jump) from the phase into the spinodal region were efficiently frozen. For a constant duration time of irriadation (5 min), the sizes of these ordered structures become larger as the blend was photo-cross-linked at a later time. Furthermore, the ordered structures revealed in these irradiated blends are different from those experiencing the same T-jump condition without irradiation. The corresponding maxima of the dielectric tan delta s of these irradiated blends shift toward the higher temperature side as the delay time of irradiation increases. Though only PSA chains were cross-linked, these ordered structures are thermally quite stable. Graphs, Photomicrographs. 23 ref.--AA |
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Bibliography: | istex:DE37548FFB0B5078D8FE0FDAADC2D1B826B24645 ark:/67375/TPS-N05MH6KZ-Q ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma00007a011 |