Dilatometric study of deformation induced volume increase and recovery in rigid PVC

Pixa, R.; Dû, V. Le; Wippler, C.

doi:10.1007/bf01410846

Cited by 22 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure , the tan δ as a function of frequency in the temperature range where a specific process is visible are shown for the thermally rejuvenated sample, the short‐ and the long‐term aged samples. The resulting spectra of thermally rejuvenated a‐PS samples reveal the main α ‐relaxation process, also found in the literature, whereas no second process, β , appears in the whole frequency range [Figs. and (b)].…”

Section: Resultssupporting

confidence: 68%

“…Numerous studies have been done to examine the effect of physical aging on the macroscopic mechanical behavior of glassy polymers and similarly for the enthalpy changes upon aging . Most of the studies are trying to explain their results based on the free‐volume theory, in which the changes of the properties of the material are interpreted solely by the changes in free volume .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of low‐temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Grigoriadi

Putzeys

Wübbenhorst

et al. 2019

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The local and cooperative dynamics of atactic PS (a‐PS) were studied by broadband dielectric relaxation spectroscopy (BDRS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR‐FTIR). The a‐PS has been subjected to thermal rejuvenation and subsequent quenching, short‐term aging (6 weeks), and long‐term aging (1 year) at ambient conditions. Where for the rejuvenated sample only an α‐ and a γ‐relaxation is observed, short‐term aging results in an additional β*‐relaxation that merges with the α‐relaxation at longer aging times. The γ‐relaxation is increasing in intensity and activation energy during aging. The α‐process shows no spectral changes and shift in the relaxation time upon aging. This may be attributed to a possible erasure of history of the material during the temperature‐sweep mode measurement. Fourier transform infrared spectroscopy (FTIR) results suggest that the energetically favorable trans‐trans (tt) conformers are increased in population with aging. © 2019 The Authors. Journal of Polymer Science Part B: Polymer Physics published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1394–1401

show abstract

Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Effect of low‐temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Grigoriadi

Putzeys

Wübbenhorst

et al. 2019

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

show abstract

“…Physical ageing of polymeric glasses is known to affect the material properties, like the mechanical , or gas-transport properties, posing limitations on their applications. A lot of studies have been conducted on the influence of physical ageing of glassy polymers on yielding, − ,, creep, − volume relaxation, ,− enthalpy changes, ,,− molecular-scale dynamics, − and structural changes. − However, the connection between the molecular structure and the ageing kinetics has not yet been established.…”

Section: Introductionmentioning

confidence: 99%

Physical Ageing of Polystyrene: Does Tacticity Play a Role?

et al. 2019

View full text Add to dashboard Cite

The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.

show abstract

“…On the one hand, some authors pointed out that applying shear stress on polymers may [29][30][31]. On the other hand, it was highlighted in the literature that shear loading may lead to appearance of normal stresses.…”

Section: Biaxial Testsmentioning

confidence: 99%

Experimental Study on High Damping Rubber Under Combined Action of Compression and Shear

Tinard

Tam

Fond

2015

Journal of Engineering Materials and Technology

View full text Add to dashboard Cite

High damping rubber (HDR) is used in HDR bearings (HDRBs) which are dissipating devices in structural systems. These devices actually have to support permanent static load in compression and potential cyclic shear when earthquakes occur. Mastering the behavior of bearings implies an accurate understanding of HDR response in such configuration. The behavior of HDR is, however, complex due to the nonlinearity and time dependance of stress-strain response and especially Mullins effect. To the authors' knowledge, tests on HDR under combined quasi-static compression and cyclic shear (QC-CS) have not been performed with regard to Mullins effect yet. The purpose of this study is thus to assess experimentally Mullins effect in HDR, especially under QC-CS. In order to achieve this aim, cyclic tensile and compression tests were first carried out to confirm the occurrence of Mullins effect in the considered HDR. Then, an original biaxial setup allowing testing HDR specimen under QC-CS was developed. This setup enables us to identify Mullins effect of the considered HDR under this kind of loading. Tests carried out with this setup were thus widened to the study of the influence of compression stress on shear response under this loading, especially in terms of shear modulus and density of energy dissipation.

show abstract

Dilatometric study of deformation induced volume increase and recovery in rigid PVC

Cited by 22 publications

References 9 publications

Effect of low‐temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Effect of low‐temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Physical Ageing of Polystyrene: Does Tacticity Play a Role?

Experimental Study on High Damping Rubber Under Combined Action of Compression and Shear

Contact Info

Product

Resources

About