On the application of an association model to blends containing poly(hydroxy ether of bisphenol A)

Espí, Enrique; Alberdi, M.; Iruin, J. J.

doi:10.1021/ma00069a026

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…One of the possible reasons for the discrepancy could be attributed to experimental errors derived from the use of analogue compounds in the determination of association constants and enthalpies (1 1). However, the Painter and Coleman model was able to predict correctly (11,121, with these parameters, phase behavior and other thermodynamic properties previously measured (13)(14)(15)(16). These results are u s e ful to illustrate the complexity of the model and the necessity of taking into account enthalpies of association, entropic contributions, etc., before judging a particular blend.…”

Section: Phenoxy/poly(vinyl Methyl Ether) / Poly(e-caprolactone) Blendsupporting

confidence: 54%

An extension of the Painter‐Coleman miscibility guide to ternary polymer blends

Espí

Fernández‐Berridi

Iruin

1994

Polymer Engineering & Sci

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The idea of separating the free energy of mixing into two contributions (corresponding to the “physical” or “nonspecific” and to the “specific” interactions, respectively) proposed by Painter and Coleman has been extended to ternary polymer/polymer/polymer blends. In this paper experimental phase diagrams of three ternary blends have been reproduced by estimating both contributions for the interaction energy density (Bij) which characterizes each polymer pair. In contrast to the Painter‐Coleman Miscibility Guide rules, we have found that, in some cases, “specific” contributions positive and unfavorable to the mixing, due to the self‐association of one of the components, can describe more adequately the experimental trends.

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Section: Phenoxy/poly(vinyl Methyl Ether) / Poly(e-caprolactone) Blendsupporting

confidence: 54%

An extension of the Painter‐Coleman miscibility guide to ternary polymer blends

Espí

Fernández‐Berridi

Iruin

1994

Polymer Engineering & Sci

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“…Polymer blends containing PH have been widely studied by this technique. Some of the studied polymer families are polyoxides, polyesters, polyacrylates, and polymethacrylates, among others . In this case, specific intermolecular interactions such as hydrogen bonds are expected between the hydroxyl groups of PH and the carbonyl groups of PLLA and the copolymer.…”

Section: Resultsmentioning

confidence: 99%

“…This behavior has been attributed to the capability of the hydroxyl groups to form specific interactions via hydrogen bond with other functional groups present in the other polymers. These interactions and their effects in the miscibility have been widely studied by Fourier transform infrared (FTIR) spectroscopy . PH is not a biodegradable polymer, therefore it is expected that the addition of low PH amount will improve the barrier character of PLLA without hindering the degradation of PLLA.…”

Section: Introductionmentioning

confidence: 99%

Improving the barrier character of polylactide/phenoxy immiscible blend using poly(lactide‐co‐ɛ‐caprolactone) block copolymer as a compatibilizer

Sangroniz

Chaos

García

et al. 2017

J of Applied Polymer Sci

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The improvement of the barrier character of polylactide by the addition of poly(hydroxy ether) of bisphenol A (Phenoxy) and poly(lactide-co-E-caprolactone) copolymer that acts as a compatibilizer is studied. First, differential scanning calorimetry, Fourier transformed infrared spectroscopy, and scanning electron microscopy show that the addition of the copolymer allows to obtain a miscible ternary system. The permeability of polylactide to water vapor, oxygen, and carbon dioxide is enhanced with the addition of phenoxy but better improvement in its barrier character is obtained with the addition of the compatibilizer. The effects of different factors such as miscibility, glass transition temperature, and crystallinity on the transport properties are analyzed. Several permeability prediction models for heterogeneous systems have been applied obtaining quite good results for water vapor and oxygen permeability.

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“…These two cases are similar to examplesgivenbythePCAMintheiroriginalpublications. [2][3][4][5][6][7] On the other hand, both phenoxy and PDA molecules with the long repeating unit provide a relatively smaller number of potential H-bonding sites to form less intermolecular H-bonds with the phenolic. The reduction in entropy by forming a phenolic-modifier interaction for those modifiers with the long repeating unit is not great enough to overcome the entropy increase associated with the breaking off of the self-association of the phenolic.…”

Section: Resultsmentioning

confidence: 99%

Effects of Molecular Structure of Modifiers on the Thermodynamics of Phenolic Blends: An Entropic Factor Complementing PCAM

Chu

et al. 1999

Macromolecules

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Different thermodynamics in phenolic blends with different polymeric modifiers, i.e., phenoxy, poly(decamethylene adipate), poly(ethylene oxide), and poly(vinyl alcohol), calculated by the Painter and Coleman association model (PCAM) are examined. The thermodynamics is calculated based upon the equilibrium constants derived experimentally from infrared spectroscopies of low molecular weight analogues with similar hydrogen-bonding formation. The discrepancies between the PCAM predictions and the experimentally observed T g and free volume variation with blending composition are attributed to the additional entropic effects introduced by the long repeated units of modifiers. The structural characteristics and hydrogen-bonding heterogeneity as derived from solid-state NMR and IR spectra support the notion that the length and size of the modifier repeated unit are responsible for such discrepancies. These observed nonidealities can be interpreted as competition between inter- and intraassociations (ΔH m favored), which depend on the entropy rise associated with the amount of increase of the breaking off of the self-association in phenolic and modifiers within blends. While PCAM is based on “true” miscibility, however, minor modification is required to better describe the thermodynamics for “real” blends where microdomain heterogeneity with size greater than that defined by thermodynamic criteria may be present.

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On the application of an association model to blends containing poly(hydroxy ether of bisphenol A)

Cited by 11 publications

References 7 publications

An extension of the Painter‐Coleman miscibility guide to ternary polymer blends

An extension of the Painter‐Coleman miscibility guide to ternary polymer blends

Improving the barrier character of polylactide/phenoxy immiscible blend using poly(lactide‐co‐ɛ‐caprolactone) block copolymer as a compatibilizer

Effects of Molecular Structure of Modifiers on the Thermodynamics of Phenolic Blends: An Entropic Factor Complementing PCAM

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