ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary A new route towards the formation of micro-phase separated semi- interpenetrating polymer networks (semi-IPN's) is described for the system atactic PS in methacrylates. It comprises the arrest of spinodal decomposition of an aPS solution by thermoreversible gelation (vitrification) of the polymer-rich phase. After lowtemperature UV-polymerization and crosslinking of the methacrylate, the phase separated structure is preserved at room temperature. Thus the steps of morphology formation and polymerization are separated. The demixing and gelation behaviour of solutions of atactic PS in several n-alkyl and branched methacrylates was studied. Gelation temperatures were found to be determined by the position of the demixing curves along the temperature axis and thereby the intersection points with the glass transition-concentration curve of plasticized PS. At polystyrene concentrations of 2 and 5 wt% a bicontinuous microphase separated morphology could be obtained with domain sizes of 0.2–0.5 μm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00297439
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