Porous Films via PE/PEO Cocontinuous Blends

Trifkovic, Milana; Hedegaard, Aaron T.; Huston, Kyle J.; Sheikhzadeh, M.; Macosko, Christopher W.

doi:10.1021/ma300293v

Cited by 53 publications

(62 citation statements)

References 37 publications

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“…Table 1 shows the polymer properties; experimental methods to determine molecular weight and functionality were reported previously. 31 One pristine unmodified montmorillonite (Cloisite Na + ) and four organically modified clays (Cloisite 15A, Cloisite 20A, Cloisite 10A, and Cloisite 30B) were used in these blends and were provided by Southern Clay Products, Inc., USA. Table 2 shows the chemical structure of the intercalating cations and the structural information on the nanoclays, provided by the material supplier.…”

Section: ■ Introductionmentioning

confidence: 99%

Stabilization of PE/PEO Cocontinuous Blends by Interfacial Nanoclays

et al. 2015

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Organomodified clays are known to be effective in polymer blend compatibilization if located preferentially at the domain interfaces, but little is known regarding the origin of their localization. In this study, we investigate the effect of organomodifier, clay loading, and shear environment on the compatibilization extent in nonreactive polyethylene (LDPE)/ poly(ethylene oxide) (PEO) and reactive maleic anhydride functional polyethylene (PE-g-MA)/PEO polymer blends. We pose important questions: If clay is to compatibilize blends by interfacial localization, how does organomodifier affect its localization? How does an increase in clay loading affect the shape and elasticity of the interface? What is the shear intensity needed to overcome the equilibrium distribution of clays and delaminate it from the interface? We utilize laser scanning confocal microscopy and 3D image analysis to calculate characteristic phase size and gain unique insights into the connection between the clay loading and the interfacial curvature. Our experiments demonstrate that 1 wt % of interfacially localized clay is sufficient to suppress coarsening and greatly reduce phase domains. However, further increase of clay loading only saw a marginal reduction in phase size compared to 1 wt % clay loading. The interfacial curvature calculations showed that with increase in clay loadings beyond 1 wt % the shape of the interface does not change significantly; however, slight broadening of curvature distribution and increasing asymmetry are observed from 3D images. This can be attributed to the multiple layers of clay jammed at the interface at higher clay loadings. When reactive PE-g-MA was substituted for LDPE, graft copolymers were generated via in situ coupling at the interface. These copolymers combined with clay resulted in the smallest phase domains. In addition, we show that clay dispersion and localization were largely independent of shear intensity, which suggests that clay does not delaminate from the interface even in high shear environments.

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Section: ■ Introductionmentioning

confidence: 99%

Stabilization of PE/PEO Cocontinuous Blends by Interfacial Nanoclays

et al. 2015

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“…The reduction in the PEO droplets is attributed to the interaction of the hydroxyl end group of PEO with the maleic anhydride group of maleated PE. 10 Among the different strategies adopted here to compatibilize PE/PEO blends, it is well evident from the earlier section that GO-NH 2 and the combination of GO-NH 2 and maleated PE were quite efficient. Hence, in order to assess the efficiency of the above mentioned reactive modiers, the morphology was evaluated by annealing the blends for different time scales.…”

Section: Resultsmentioning

confidence: 80%

Polyolefin based antibacterial membranes derived from PE/PEO blends compatibilized with amine terminated graphene oxide and maleated PE

et al. 2014

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In this study, various strategies like amine terminated GO (GO-NH 2 ), in situ formed polyethylene grafted GO (PE-g-GO) and their combinations with maleated PE (maleic anhydride grafted PE) were adopted to reactively compatibilize blends of low density polyethylene (LDPE) and polyethylene oxide (PEO). These blends were further explored to design porous, antibacterial membranes for separation technology and the flux and the resistance across the membranes were studied systematically. It was observed that GO-NH 2 led to uniform dispersion of PEO in a PE matrix and further resulted in a significant improvement in the mechanical properties of the blends when combined with maleated PE. The efficiency of various compatibilizers was further studied by monitoring the evolution of morphology as a function of the annealing time. It was observed that besides rendering uniform dispersion of PEO in PE and improving the mechanical properties, GO-NH 2 further suppresses the coalescence in the blends. As the melt viscosities of the phases differ significantly, there is a gradient in the morphology as also manifested from scanning acoustic microscopy. Hence, the membranes were designed by systematically reducing the thickness of the as-pressed samples to expose the core as the active area for flux calculations. Selected membranes were also tested for their antibacterial properties by inoculating E. coli culture with the membranes and imaging at different time scales. This study opens new avenues to develop PE based cost effective anti-microbial membranes for water purification.

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“…6,7 In some cases, several approaches are combined to get rid of the drawbacks of a single method. A large number of water-soluble polymers are available as sacrificial polymers, such as polyvinyl alcohol (PVA), 10,11 poly(ethylene oxide), [12][13][14] polyvinylpyrrolidone, 15 and sulfopolyester 16,17 to avoid any toxicity problem during the process. Among the technologies, melt blending is a nonsolvent, cost-effective, and highly efficient process.…”

Section: Introductionmentioning

confidence: 99%

Porous fibers surface decorated with nanofillers: From melt‐spun PP/PVA blend fibers with silica nanoparticles

Xiang

Cayla

Salaün

et al. 2019

J of Applied Polymer Sci

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Biphasic polypropylene (PP)-polyvinyl alcohol (PVA) fibers containing silica nanoparticles with various surface hydrophobicity were melt-spun. The localization of nanoparticles relates on the thermodynamic factors, and the design promotes a surface-decorated fibrous scaffold with nanoparticles after selective extraction. The influence of silica nanoparticles on the melt flow index was observed, and the interface-located Aerosil R972 silica nanoparticles lead to an increase in viscosity. The scanning electron microscopy (SEM) demonstrates the preponderant interfacial localization of Aerosil R972 nanoparticles within the biphasic fibers. The porous morphology of the obtained fibers was investigated by SEM, selective extraction experiment, X-ray diffraction analysis, and dynamical mechanical analysis. The specific interface area of PP 70 -PVA 30 fibers with a draw ratio (DR) of 2 is 3.2 m 2 g −1 and is further enlarged with the increase of DR. The incorporation of nanoparticles contributes to the increase of interconnectivity of the PVA phase. The further increment of DR modifies the crystalline structure, and results in better mechanical properties. The Aerosil R972-containing fibers with the DR of 3 provide almost completely accessible PVA phase, with enough mechanical strength to be transformed into textile products, and retains a good mechanical property after selective extraction.

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Porous Films via PE/PEO Cocontinuous Blends

Cited by 53 publications

References 37 publications

Stabilization of PE/PEO Cocontinuous Blends by Interfacial Nanoclays

Stabilization of PE/PEO Cocontinuous Blends by Interfacial Nanoclays

Polyolefin based antibacterial membranes derived from PE/PEO blends compatibilized with amine terminated graphene oxide and maleated PE

Porous fibers surface decorated with nanofillers: From melt‐spun PP/PVA blend fibers with silica nanoparticles

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