A new insight in the dynamo-mechanical behavior of poly(ethylene terephthalate)

Cristea, Mariana; Ionita, Daniela; Simionescu, Bogdan C.

doi:10.1016/j.eurpolymj.2010.08.008

Cited by 44 publications

(41 citation statements)

References 42 publications

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“…Extensive thermal analysis studies performed previously on poly(ethylene terephthalate) stated that high heating rates and low frequencies favor melting over crystallization. 24,28 The characteristics of the tan peak subsequent to the glass transition are consistent with its assignment to melting. At the same time, it is very possible that the end side of the relaxation peak, which is shifted to higher temperature with increasing frequency, covers up the melting peak, which is anyway diminished at higher frequencies.…”

Section: Resultssupporting

confidence: 71%

Relaxation behavior of flax-reinforced ethylene–propylene–diene rubber

Cristea¹,

Airinei²,

Ionita³

et al. 2015

High Performance Polymers

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The molecular dynamics of flax-reinforced ethylene-propylene-diene monomer (EPDM) composites, with increasing quantities of flax (EPDM 0 -EPDM 20 ), was investigated by dynamic mechanical analysis. Multifrequency experiments were also performed in order to distinguish between the relaxation and the kinetic events. Also the time-temperature superposition was applied to the multifrequency results for obtaining the master curves. They were used to anticipate the behavior of the composites in time and to calculate the activation energies using the Williams-Landel-Ferry equation.

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Section: Resultssupporting

confidence: 71%

Relaxation behavior of flax-reinforced ethylene–propylene–diene rubber

Cristea¹,

Airinei²,

Ionita³

et al. 2015

High Performance Polymers

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“…Low frequencies are more sensitive in detecting and separating relaxations. From practical point of view, as the frequency is lower, the instrument needs longer time for the experiment (Cristea et al, 2010) and temperature increase in ramp mode, even at a smaller heating rate, is not enough. In order to give enough time to the instrument to perform duly the experiment, the temperature was increased in step-scan mode (Fig.…”

Section: 1mentioning

confidence: 99%

“…Thermomechanical analysis performed in multifrequency mode can be a valuable option in elucidating the complicated features of the thermo-mechanical curves resulted from the single-frequency experiment and not only (Grant et al, 2012;Lomakin et al, 2011;Ghosh et al, 2008;Cristea et al, 2010). The behavior of the crosslinked structures would be better defined and the particularities of the experiment that requires a different heating mode and a longer time make possible to assess the evolution of the polyurethane network when it incorporates increasingly quantities of AESO.…”

Section: Introductionmentioning

confidence: 98%

Effect of long-term and short-term dynamic mechanical evaluation of networks based on urethane and soybean oil

Cristea¹,

Ionita²,

Doroftei³

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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“…It can be assigned to the flowing process, 28 when the polymer chains start to slip past one another to a great extent along the main macromolecular axis. However, this increase of tan comes to an end at Figure 3.…”

Section: Dynamo-mechanical Behaviour Of the Blendsmentioning

confidence: 99%

Dielectric and gas transport properties of highly fluorinated polyimides blends

Constantin¹,

Damaceanu²,

Varganici³

et al. 2015

High Performance Polymers

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The physicochemical properties of highly fluorinated polyimide blends were studied in order to highlight the advantages of employing a high content of fluorine atoms to tailor the properties of polyimide materials. Thus, dynamo-mechanical analysis was used to evidence the physical phenomena taking place during heating. The trend of storage modulus, loss modulus and loss factor tangent with temperature during and after the relaxation was explored. The dielectric spectroscopy was carried out to investigate the dielectric behaviour at different temperatures and frequencies and to evaluate the values of dielectric constant, dielectric loss and electrical resistance. The dielectric spectroscopy data were corroborated with the dynamo-mechanical analysis to highlight the sub-glass transitions encountered in these blend films. Dielectric loss diagrams showed sub-glass transitions in the form of and relaxations mainly due to the segmental mobility of the polymer chain components. The gas separation performance of some of the investigated blends was assesed, and their ability to achieve simultaneously higher gas permeability and higher selectivity was demonstrated.

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A new insight in the dynamo-mechanical behavior of poly(ethylene terephthalate)

Cited by 44 publications

References 42 publications

Relaxation behavior of flax-reinforced ethylene–propylene–diene rubber

Relaxation behavior of flax-reinforced ethylene–propylene–diene rubber

Effect of long-term and short-term dynamic mechanical evaluation of networks based on urethane and soybean oil

Dielectric and gas transport properties of highly fluorinated polyimides blends

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