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Element-specific study of local segmental dynamics of polyethylene terephthalate upon physical aging
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10.1063/1.4751553
/content/aip/journal/jcp/137/10/10.1063/1.4751553
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/10/10.1063/1.4751553
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Relative length changes ΔL/L 0 as a function of aging time after up-quenching to 323 K (red open circles), 328 K (green open triangles), and 333 K (blue open squares) together with (b) the thermal history. The solid line in (a) is the result of the fit with KWW function.

Image of FIG. 2.
FIG. 2.

(a) DSC curves for the samples unaged, and aged at 323 K for 1 h, 2 h, 5 h, 10 h, and 20 h. (b) Relaxation enthalpies ΔH evaluated from the endothermic peaks in (a) as a function of aging time. The solid line in (b) is the result of the fit with two superimposed exponentials.

Image of FIG. 3.
FIG. 3.

(a) Aging-time dependent free volume fraction f v on the left-hand and its size R on the right-hand at the temperatures of 323 K (red open and full circles), 328 K (green open and full triangles), and 333 K (blue open and full squares). (b) Aging-time dependent S parameter at the temperatures of 323 K (red open circles), 328 K (green open triangles), and 333 K (blue open squares). The solid lines are the results of the fits with two superimposed exponentials.

Image of FIG. 4.
FIG. 4.

(a) Logarithms of the first decay constants (κ 1) obtained from the data of o-Ps lifetime (open circles) and Doppler broadening (full circles) spectroscopy as a function of inverse temperature. (b) Logarithms of the second decay constants (κ 2) obtained from the data of o-Ps lifetime (open squares) and Doppler broadening (full squares) spectroscopy as a function of inverse temperature. The solid lines are the results of the fit with Arrhenius equation.

Image of FIG. 5.
FIG. 5.

(a) Correlation between the S parameter and o-Ps fraction for polyolefins (full circles) and oxygen-containing polymers (full triangles). Solid straight lines are the results of the fit for two polymer groups with Eq. (2.2). For sample numbers, see text of the experimental section. Red open circles, green open triangles, and blue open squares denote the correlation for the aged PET samples at 323 K, 328 K, and 333 K, respectively. Red, green, and blue arrows are drawn for guiding the eye. (b) Blown-up section in the correlation focusing on the initial stage of relaxation. Black solid line corresponds to the line of O-group. Red, green, and blue solid lines are the correlation calculated from the aging-time dependent curves in Figures 3(a) and 3(b). The data at the aging time of 45 min and 90 min are presented at each temperature for clarification. (c) Blown-up section in the correlation focusing on the data of the aged PET samples.

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/content/aip/journal/jcp/137/10/10.1063/1.4751553
2012-09-13
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Element-specific study of local segmental dynamics of polyethylene terephthalate upon physical aging
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/10/10.1063/1.4751553
10.1063/1.4751553
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