Influence of the organic compounds addition in the polymer free volume, gas sorption and diffusion

Eceolaza, Sorkunde; Iriarte, Marian; Uriarte, C.; Rı́o, J. del; Etxeberria, Agustín

doi:10.1016/j.eurpolymj.2012.04.018

Cited by 16 publications

(13 citation statements)

References 47 publications

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“…In such a case, it is possible to observe an increase in R 3 and a decrease in I 3 values as shown in Table . The increase in R 3 values after post‐curing was tried to be explained by some authors as the removal of some species following a static post‐curing process …”

Section: Resultsmentioning

confidence: 99%

Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation

Alessi

Caponetti

Güven

et al. 2015

Macro Chemistry & Physics

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In this work, a multi-scale approach with different analytical methods is applied to study the\ud curing process and the structural properties of a diglycidyl ether of bisphenol A (DGEBA) epoxy\ud resin. This monomer, thermally cured using 4,4′-diaminodiphenilsulfone (DDS) as hardener,\ud is analyzed after 10, 45, 90, and 120 min of reaction time at 180 °C to obtain information on\ud samples with different cross-linking densities. Samples are also characterized after extraction\ud in acetone in order to obtain structural information on the insoluble parts. For this purpose, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), solid-state nuclear magnetic resonance (ss-NMR), and positron annihilation lifetime spectroscopy (PALS) are\ud employed. The importance of this multi-method approach lies in the possibility to obtain a more complete knowledge of the investigated system, overcoming the limits inherent to the use of a single technique, through the correlation among results obtained from different structural investigation\ud methodologies

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Section: Resultsmentioning

confidence: 99%

Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation

Alessi

Caponetti

Güven

et al. 2015

Macro Chemistry & Physics

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“…Three spectra were recorded for each sample and the data were analyzed using the PATFIT‐88 program. Further details about methods have been described elsewhere . The positron annihilation in the free volume holes allows to correlate the hole size with the measured lifetime.…”

Section: Methodsmentioning

confidence: 99%

“…Further details about methods have been described elsewhere. [26][27][28] The positron annihilation in the free volume holes allows to correlate the hole size with the measured lifetime. According to the model proposed by Eldrup,29 the o-Ps lifetime is related to the hole radius by,…”

Section: Free Volume Characterizationmentioning

confidence: 99%

Improving the barrier character of poly(caprolactone): Transport properties and free volume of immiscible blends

Eceolaza

Sangroniz

Rı́o

et al. 2019

J of Applied Polymer Sci

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In this work, the barrier character of poly(caprolactone) is improved with the addition of a poly(hydroxy amino ether). The analysis by means of thermal, thermomechanical, and morphology characterization reveals that the blends are partially miscible. The characterization of the morphology has revealed that the blends show a droplet matrix morphology. The free volume of the samples has been characterized by positron annihilation lifetime spectroscopy observing a decrease in the free volume as the poly(hydroxyamino ether) (PHAE) content increases. The barrier character to water vapor and carbon dioxide is greatly improved with the addition of PHAE. However, the observed improvement does not arise only from the reduced free volume, playing the interactions between penetrants and polymers a major role. Overall, this work aims to provide a further insight on the factors affecting the improvement of the barrier character of biodegradable polymers, which would allow developing new materials for packaging applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48018.

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“…For example, Kinjo and Nakagawa studied the effect of five different diluents (tricresyl phosphate, butyl benzyl phthalate, dioctyl phthalate, dibutyl sebacate, and dioctyl sebacate) on the β secondary relaxation, glass transition, and Young's modulus, observing a simultaneous decrease in T g and increase in modulus. The probable mechanism of antiplasticization is not well understood, however, the suppression of secondary relaxations with the decrease in T g , together with changes in the free‐volume, are considered as the main causes of it . The antiplasticization magnitude is determined by the potential of the additive in inhibiting secondary relaxations …”

Section: Introductionmentioning

confidence: 99%

“…The antiplasticization induced by low molar mass molecules has been extensively used in order to improve the barrier properties of polymers. One argument for this is that antiplasticization is associated with losing of free volume that results in changes in the relaxation spectrum of the polymer and, therefore, in barrier and mechanical properties . However, one of the most interesting aspects of this effect is the enhancement of the Young's modulus without losing the transparency of amorphous polymers, as the antiplasticizer is soluble in the polymer.…”

Section: Introductionmentioning

confidence: 99%

Improvement of processing and mechanical properties of polyetherimide by antiplasticization with resorcinol bis(diphenyl phosphate)

Alexandrino

Conceição

Felisberti

2014

J of Applied Polymer Sci

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This article describes the antiplasticization of a commercial polyetherimide ULTEMV R series 1000 [poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) by resorcinol bis(diphenyl phosphate)] (RDP) and its implications on the thermomechanical processing, namely extrusion and injection molding, as well as on the thermal and mechanical properties of the formulations. This antiplasticization effect allows the processing of polyetherimide formulations at lower temperatures in comparison with neat polymer due to the progressive decrease of the glass transition temperature with increased RDP concentration, as observed by differential scanning calorimetry and dynamic mechanical analysis. The decrease of T g occurs concomitantly with the overlap of the glass transition and b relaxation and with the shift of the c relaxation to higher temperatures. These changes in the relaxation spectrum of polyetherimide formulations are possibly responsible for the increase of the tensile strength and Young's modulus and changes in the fracture mechanism, as observed by stress-strain tests and by scanning electron microscopy, respectively. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40619.

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Influence of the organic compounds addition in the polymer free volume, gas sorption and diffusion

Cited by 16 publications

References 47 publications

Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation

Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation

Improving the barrier character of poly(caprolactone): Transport properties and free volume of immiscible blends

Improvement of processing and mechanical properties of polyetherimide by antiplasticization with resorcinol bis(diphenyl phosphate)

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