Segmental Relaxation of Poly(styrene-<i>co</i>-vinylphenol)

Schroeder, Maria J.; Roland, C. M.; Kwei, T. K.

doi:10.1021/ma990317n

Cited by 20 publications

(26 citation statements)

References 66 publications

(131 reference statements)

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“…Such a trend is not unusual, having previously been seen in PVE [58], polyisoprene [59], and PVAc [60]. On the other hand, a b that is nearly independent of temperature is found for many amorphous polymers, including poly(propyleneglycol) [61,62], poly(vinylmethylether) [63,64], and poly(styreneco-vinylphenol) [16].…”

Section: Relaxation Function Breadthmentioning

confidence: 52%

Comparison of glass formation kinetics and segmental relaxation in polymers

Robertson

Santangelo

Roland

2000

Journal of Non-Crystalline Solids

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Section: Relaxation Function Breadthmentioning

confidence: 52%

Comparison of glass formation kinetics and segmental relaxation in polymers

Robertson

Santangelo

Roland

2000

Journal of Non-Crystalline Solids

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“…74 Various molecular liquids appear to conform to this idea. 74,75 , although we have shown that the correlation fails for polymers [76][77][78] . In Fig.…”

Section: Resultsmentioning

confidence: 70%

Adam–Gibbs model for the supercooled dynamics in the ortho-terphenyl ortho-phenylphenol mixture

Roland

Capaccioli

Lucchesi

et al. 2004

The Journal of Chemical Physics

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Dielectric measurements of the alpha-relaxation time were carried out on a mixture of ortho-terphenyl (OTP) with ortho-phenylphenol, over a range of temperatures at two pressures, 0.1 and 28.8 MPa. These are the same conditions for which heat capacity, thermal expansivity, and compressibility measurements were reported by Takahara et al. [S. Takahara, M. Ishikawa, O. Yamamuro, and T. Matsuo, J. Phys. Chem. B 103, 3288 (1999)] for the same mixture. From the combined dynamic and thermodynamic data, we determine that density and temperature govern to an equivalent degree the variation of the relaxation times with temperature. Over the measured range, the dependence of the relaxation times on configurational entropy is in accord with the Adam-Gibbs model, and this dependence is invariant to pressure. Consistent with the implied connection between relaxation and thermodynamic properties, the kinetic and thermodynamic fragilities are found to have the same pressure independence. In comparing the relaxation properties of the mixture to those of neat OTP, density effects are stronger in the former, perhaps suggestive of less efficient packing.

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“…͑1͔͒, consistent with the AG model, but without invoking cooperativity. 4 On the other hand, experimental results for polymers [6][7][8][9][10] are at odds with the energy landscape approach per se.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the correlation between structural relaxation time and configurational entropy under high pressure in a chlorinated biphenyl

Casalini

Paluch

Fontanella

et al. 2002

The Journal of Chemical Physics

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Dielectric relaxation measurements on a chlorinated biphenyl ͑PCB62͒ were carried out over a broad frequency range, with variation of both temperature and pressure. In combination with calorimetric determinations of the configurational entropy, these data could be described using the Adam-Gibbs model. Specifically, the experimental results were interpreted using a recently introduced equation for both the temperature and pressure dependencies of the structural relaxation time. The (T, P) data for PCB62 yielded values of the fitting parameters consistent with known physical properties of the material. A change of the dynamics was evident in isobaric measurements at atmospheric pressure, corresponding to a value of the relaxation time B ϳ5ϫ10 Ϫ5 s. A related change of dynamics was observed in isothermal experiments at varying pressures. It is noteworthy that the latter transpired at a very similar ϳ B . Moreover, the shape of the relaxation function depended only on the value of . We believe this is the first reported evidence of such a change of dynamics in experiments using pressure as a variable. These results suggest that this change is governed by the time scale of the relaxation, independently of any particular combination of T and P.

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Segmental Relaxation of Poly(styrene-co-vinylphenol)

Cited by 20 publications

References 66 publications

Comparison of glass formation kinetics and segmental relaxation in polymers

Comparison of glass formation kinetics and segmental relaxation in polymers

Adam–Gibbs model for the supercooled dynamics in the ortho-terphenyl ortho-phenylphenol mixture

Investigation of the correlation between structural relaxation time and configurational entropy under high pressure in a chlorinated biphenyl

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