Oxygen barrier properties of crystallized and talc‐filled poly(ethylene terephthalate)

Sekelik, D. J.; Stepanov, E. V.; Nazarenko, S.; Schiraldi, David A.; Hiltner, A.; Baer, E.

doi:10.1002/(sici)1099-0488(19990415)37:8<847::aid-polb10>3.3.co;2-v

Cited by 132 publications

(117 citation statements)

References 8 publications

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“…In the case of poly(ethylene terephthalate) (PET), permeability decrease with increasing crystallinity only relies on the drop of D and a rise of S what has been evidenced by several authors [38][39][40]. The effect was explained by dedensification of the amorphous phase, which increases oxygen solubility.…”

Section: Gas Barrier Propertiesmentioning

confidence: 99%

Impact of crystallinity of poly(lactide) on helium and oxygen barrier properties

Guinault¹,

Sollogoub²,

Ducruet³

et al. 2012

European Polymer Journal

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible.This is an author-deposited version published in: http://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/10118 To cite this version :A GUINAULT, C SOLLOGOUB, Violette DUCRUET, Sandra DOMENEK -Impact of crystallinity of poly(lactide) on helium and oxygen barrier properties -European Polymer Journal -Vol. 48, p.779-788 -2012 Any correspondence concerning this service should be sent to the repository The helium and oxygen gas barrier properties of poly(lactide) were investigated as a function of stereochemistry and crystallinity degree. Poly(L-lactide) and poly(D,L-lactide) films were obtained by extrusion and thermally cold crystallized in either a 0 -or a-crystalline form with increasing crystallinity degree. Annealing of the films at low temperatures yielded to a 0 -crystals as well as the creation of a rigid amorphous fraction in the amorphous phase. Unexpectedly, the quantity of the rigid amorphous fraction was highest in poly(L-lactide) crystallized under a 0 -form. Unexpectedly, the gas permeability increased with increasing quantity of a 0 -crystals in poly(L-lactide) and remained constant with increasing quantity of a 0 -crystals in poly(D,L-lactide). A gain in gas barrier properties was obtained upon crystallization at higher temperatures yielding a-crystals. The analysis of the oxygen transport parameters, in particular the diffusion and the solubility coefficient showed that the diffusion was accelerated upon crystallization, while the solubility coefficient decreased in an expected manner which led to conclude that it remained constant in the amorphous phase. The acceleration of the diffusion seems to be correlated to the occurrence of the rigid amorphous fraction, which holds larger free volume. To conclude, for optimization of poly(lactide) gas barrier properties by focussing on the decrease of the diffusion coefficient it can be suggested to work with poly(D,L-lactide) and to aim a crystallization in a-form avoiding the formation of a rigid amorphous fraction.

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Section: Gas Barrier Propertiesmentioning

confidence: 99%

Impact of crystallinity of poly(lactide) on helium and oxygen barrier properties

Guinault¹,

Sollogoub²,

Ducruet³

et al. 2012

European Polymer Journal

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“…With the oxygen-concentration boundary conditions c(x ϭ 0, t) ϭ Sp and c(x ϭ l, t) ϭ 0 and the initial condition c(x, t ϭ 0) ϭ 0, 20,21 we obtain…”

Section: Transport Measurementsmentioning

confidence: 99%

Oxygen transport as a solid‐state structure probe for polymeric materials: A review

Hiltner

Liu

et al. 2005

J Polym Sci B Polym Phys

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ABSTRACT:In the quest to elucidate the solid-state structures of polymers, insight into the amorphous phase is particularly elusive. Although the permeability of small molecules is often measured as an important performance property, numerous researchers have found that a deeper analysis of the transport characteristics provides insight into polymer morphology, especially if used in combination with more usual characterization techniques. The transport of small gas molecules senses the permeable amorphous structure and probes the nature of the free volume. In recent years, our interest in the gas barrier of polyesters has resulted in an unusual opportunity to investigate the nature of the free volume in the polymer glassy state. This effort has been aided by access to aromatic polyesters with designed variations in their chemical structure. This review focuses on oxygen transport, supplemented with other methods of physical analysis, as a probe of the excess-hole free volume. The review addresses the profound effects of orientation and crystallization on the free volume of the glassy state. The discussion also presents a simple odel for the gas permeability of the isotropic glass based on lattice concepts and tests more sophisticated models for the gas permeability of semicrystalline polymers. The final section addresses other opportunities for fruitful applications of oxygen transport as a solid-state structure probe.

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“…Fig. 1 shows a schematic of the multilayer coextrusion method of forced assembly and how the geometric constraints and the complex flow that includes biaxial stretching [23] may create the oriented graphene layers in the multilayer film.…”

Section: Introductionmentioning

confidence: 99%

“…In 1999, the Baer group reported incorporating talc micro-platelets into poly(ethylene terephthalate) micro-layer films to reduce oxygen permeability [23]. Very recently, Guo et al [24] reported that enhanced electrical conductivity can result from oriented carbon nanotubes in layers with carbon black in polypropylene films formed through multilayer coextrusion.…”

Section: Introductionmentioning

confidence: 99%

Forced assembly by multilayer coextrusion to create oriented graphene reinforced polymer nanocomposites

McKenna

Miquelard‐Garnier

et al. 2014

Polymer

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. t r a c tA potential advantage of platelet-like nanofillers as nanocomposite reinforcements is the possibility of achieving two-dimensional stiffening through planar orientation of the platelets. The ability to achieve improved properties through in-plane orientation of the platelets is a challenge and, here, we present the first results of using forced assembly to orient graphene nanoplatelets in poly(methyl methacrylate)/ polystyrene (PMMA/PS) and PMMA/PMMA multilayer films produced through multilayer coextrusion. The films exhibited a multilayer structure made of alternating layers of polymer and polymer containing graphene as evidenced by electron microscopy. Significant single layer reinforcement of 118% at a concentration of 2 wt % graphene was achieveddhigher than previously reported reinforcement for randomly dispersed graphene. The large reinforcement is attributed to the planar orientation of the graphene in the individual polymer layers. Anisotropy of the stiffening was also observed and attributed to imperfect planar orientation of the graphene lateral to the extrusion flow. Ó

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Oxygen barrier properties of crystallized and talc‐filled poly(ethylene terephthalate)

Cited by 132 publications

References 8 publications

Impact of crystallinity of poly(lactide) on helium and oxygen barrier properties

Impact of crystallinity of poly(lactide) on helium and oxygen barrier properties

Oxygen transport as a solid‐state structure probe for polymeric materials: A review

Forced assembly by multilayer coextrusion to create oriented graphene reinforced polymer nanocomposites

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