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Probing the interfacial region of microphase-separated block copolymers by differential scanning calorimetry

✍ Scribed by Robert D. Spaans; Moin Muhammad; Michael C. Williams

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
148 KB
Volume
37
Category
Article
ISSN
0887-6266

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✦ Synopsis

A region of broad nonlinear curvature is observed in DSC traces of ABA copolymers during temperature sweeps between the glass transition temperatures of the two principal microphases. This curvature is attributed to a smoothly varying composition profile through the interfacial region lying between microphases. The shape of the DSC curve is proposed to be a fingerprint for a given profile. This curvature is, however, shown to be a possible source of uncertainty in precise evaluation of T g for the microphases and the reported enhanced breadth of these transitions. In addition, microphase separation temperatures are readily identifiable from DSC traces, and their values correspond well to the predictions of Leary-Williams theory.

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