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- W2893504879 abstract "Optical probe reorientation experiments and mechanical stress relaxation measurements in the linear response regime were performed on a polymer glass. Segmental dynamics of lightly cross-linked poly(methyl methacrylate) (PMMA) were monitored via both methods at temperatures between 9 and 24 K below the glass transition temperature (Tg) and over the course of 8 h of aging. Relaxation times from the two methods cover a range of ∼1.7 decades. Similar results were obtained from the two experiments other than a slight difference in the aging rate. A difference of ∼0.3 decades (a factor of ∼2) is observed between the optically and mechanically obtained relaxation times, related primarily to the size of the probe. Both experiments give a value near 0.3 for the Kohlrausch–Williams–Watts (KWW) β parameter. These results provide an important baseline for the interpretation of optical probe reorientation experiments during nonlinear deformation." @default.
- W2893504879 created "2018-10-05" @default.
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- W2893504879 date "2018-09-25" @default.
- W2893504879 modified "2023-09-23" @default.
- W2893504879 title "Direct Comparison of Probe Reorientation and Linear Mechanical Measurements of Segmental Dynamics in Glassy Poly(methyl methacrylate)" @default.
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- W2893504879 doi "https://doi.org/10.1021/acs.macromol.8b01522" @default.
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