Oxygen and carbon dioxide permeability of EAA/PEO blends and microlayers

Pethe, V. V.; Wang, H. P.; Hiltner, A.; Baer, E.; Freeman, Benny D.

doi:10.1002/app.28193

Cited by 30 publications

(25 citation statements)

References 20 publications

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“…Materials containing polar ether oxygen linkages, such as poly(ethylene oxide), are known to have a high CO 2 solubility due to strong interactions between ether oxygens and quadrupolar CO 2 , resulting in high CO 2 to light gas selectivities and therefore demonstrating promise as solubility selective gas separation membranes . Although PEO has a high selectivity (∼15), a high amount of relatively impermeable crystalline phase (60 wt %) causes a low permeability that can be further reduced by formation of in‐plane single crystals when confined in layers at the nano‐scale . From this example and the study done by Robeson, it is evident that high permeability will come at a cost to the selectivity.…”

Section: Resultsmentioning

confidence: 92%

Co‐extruded polymeric films for gas separation membranes

Armstrong

Offord

Paul

et al. 2013

J of Applied Polymer Sci

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In recent years, gas separation has become an important step in many production process streams and part of final products. Through the use of melt co-extrusion and subsequent orientation methods, gas separation membranes were produced entirely without the use of solvents, upon which current methods are highly dependent. Symmetric three layer membranes were produced using poly(ether-block-amide) (PEBA) copolymers, which serve as a selective material that exhibits a high CO 2 permeability relative to O 2 . Thin layers of PEBA are supported by a polypropylene (PP) layer that is made porous through the use of two methods: (1) inorganic fillers or (2) crystal phase transformation. Two membrane systems, PEBA/(PP 1 CaCO 3 ) and PEBA/b-PP, maintained a high CO 2 /O 2 selectivity while exhibiting reduced permeability. Incorporation of an annealing step either before or after orientation improves the membrane gas flux by 50 to 100%. The improvement in gas flux was a result of either elimination of strain induced crystallinity, which increases the selective layer permeability, or improvement of the PP crystal structure, which may increase pore size in the porous support layer.

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Section: Resultsmentioning

confidence: 92%

Co‐extruded polymeric films for gas separation membranes

Armstrong

Offord

Paul

et al. 2013

J of Applied Polymer Sci

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“…Manipulation of materials via microlayer co‐extrusion has been utilized to systematically study the effect of confinement on composite material responses 3. Previous work by the Baer research group has shown that thin films of confined polymers exhibit unexpected physical properties, such as barrier,4 thermal,5 and mechanical6 when compared to their bulk counterparts 7. One of the most significant contributions, thus far, has been utilizing forced assembly to confine the crystallization of semicrystalline polymers 3.…”

Section: Introductionmentioning

confidence: 99%

Investigating Interfacial Contributions on the Layer‐Thickness‐Dependent Mechanical Response of Confined Self‐Assembly via Forced Assembly

Burt

Jordan

Korley

2013

Macro Chemistry & Physics

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Understanding block copolymer (BCP) self-assembly under confi nement via conventional melt extrusion is advantageous as technology moves towards thin fi lm applications. Previous research has revealed that confi ning elastomeric BCPs in thin fi lms with polystyrene (PS) via microlayering results in an increase in ductility with decreasing layer thickness and that the interfacial region dramatically infl uences the elastic modulus. This contribution investigated the role of interfacial width and layer thickness on deformation mechanics by comparing poly(methyl methacrylate) (PMMA) and PS as wetting layers in confi ned multilayers. The interfacial region was found to be crucial to tailoring the mechanical response of composite materials.group has shown that thin fi lms of confi ned polymers exhibit unexpected physical properties, such as barrier, [ 4 ] thermal, [ 5 ] and mechanical [ 6 ] when compared to their bulk counterparts. [ 7 ] One of the most signifi cant contributions, thus far, has been utilizing forced assembly to confi ne the crystallization of semicrystalline polymers. [ 3 ] The confi ned crystallization of poly(ethylene oxide) (PEO) via microlayer co-extrusion demonstrated that in thick layers, large spherulites developed, while the PEO chains crystallized into in-plane, single lamellae in thinner layers due to the constraint of the confi ning layer. This confi ned crystallization behavior resulted in a reduction in O 2 permeability by two orders of magnitude through the thickness of the multilayer fi lm. [ 8 ] Further research revealed that the nature of the confi ning layer alters the crystal lamellae size in these PEO layered composites, which further infl uences the oxygen permeability of the multilayer fi lms. [ 9 , 10 ] Similar research utilizing microlayering technology investigated the effect of layer thickness on the glass transition temperature ( T g ) of two immiscible polymers and revealed a critical layer thickness at which the fi lm becomes completely "interphase region," resulting in a merging of the two material T g s into a single T g for the composite. [ 5 , 11 ] The understanding of structure-property relationships of

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“…Having found a scholarly paper on the topic of 'Oxygen and Carbon Dioxide Permeability of EAA/ PEO Blends and Microlayers,' [4] I was able to extract relevant information and form the conclusion that cross-linked polyethylene (PEX) is the most impermeable elastopolymer to CO 2 diffusion. An added bonus to using PEX is the fact that it is quite cheap.…”

Section: Theory and Analysismentioning

confidence: 99%

Using ultrasound technology and computational analysis to develop an automated champagne pourer

Dua¹

2013

Young Scientists J

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Champagne overspill is a problem that is well-known for party hosts and sommeliers(wine waiters). In this project, I endeavored to develop a solution to this common problem, one that has the potential to revolutionise the catering market at home, in social bars, and in corporate events. I started by considering the feasibility of the product by conducting three vital experiments -the change in CO 2 concentration of the champagne over time, the ability of ultrasonic waves to reflect off the champagne in a feedback system, and finally, a test of the durability of the product by applying virtual forces to various faces of the body (using solid works and a self-made simulator). From these experiments, the final outcome was comfortably deemed feasible in a virtual but conceptual form. I then set out to develop the virtual product using electronic, structural, and mechanical prototyping as well as programming. The computer-aided design (CAD) of the product was also developed throughout the project. Having finally emerged with a successful outcome, I then evaluated my project against the 'desired outcomes' of my project. Not only does my research and design accomplish this small problem, but the underlying mechanical principles can be applied to many other areas of the catering market.

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Oxygen and carbon dioxide permeability of EAA/PEO blends and microlayers

Cited by 30 publications

References 20 publications

Co‐extruded polymeric films for gas separation membranes

Co‐extruded polymeric films for gas separation membranes

Investigating Interfacial Contributions on the Layer‐Thickness‐Dependent Mechanical Response of Confined Self‐Assembly via Forced Assembly

Using ultrasound technology and computational analysis to develop an automated champagne pourer

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