Heterogeneity of segmental dynamics aroundtg and nanoscale compositional inhomogeneity in polyurethane/methacrylate interpenetrating networks as estimated by creep rate spectroscopy

Semi-interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate): Dielectric study of relaxation behavior

“…6, the a-relaxation of PHEMA could be seen, its amplitude decreases in semi-IPNs with increasing amount of PU and becomes broader due to incomplete phase separation in the systems [23]. As was shown previously [21][22][23][24] the formation of the interphases in the IPNs and in semi-IPNs with incomplete phase separation may result in the extraordinarily broad glass transitions domain. The differences in local composition or packing density could result in the dispersion of glass transitions.…”

“…As found, this micro and/or nanoheterogeneous morphology of IPNs may result in the extraordinarily broad glass transitions domain in such systems [21][22][23][24]. The differences in local composition or packing density resulted in the different Tg's (i.e., in a dispersion of glass transitions), and the overall effect might be just a single, very broad glass transition.…”

Influence of the Reference Temperature on the Orientation and Relaxation of Miscible Polystyrene/Poly(vinyl methyl ether) Blends

“…It has been proposed that this transition broadening can be caused by the presence of concentration fluctuations in the miscible blends at a scale inferior to the spatial resolution of the instrument. [19][20][21][22][23][24] The effect of such possible heterogeneities will be discussed later in this article.…”

Thermo-mechanical behavior of uniaxially drawn and crystallized poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) films

“…9 can be interpreted in a similar way to creep rate spectra [53][54][55][56][57][58], since the presented results e(t) can be derived to deduce the creep rate data _ eðtÞ according to…”