Microporous polypropylene sheets containing polymethylsilsesquioxane filler

Nagō, Satoshi; Mizutani, Yukio

doi:10.1002/app.1993.070501018

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…(4)- (6) to estimate the effective porosity ( e / q 2 ) and the tortuosity factor of pore (9): the pore structure of the outer layer containing relatively larger filler particles. Also, it is interesting that the porosities of Nos.…”

Section: Properties Of Microporous Pp Hollow Fibersmentioning

confidence: 99%

Microporous polypropylene hollow fibers with double layers

Nagō¹,

Mizutani²

1995

J of Applied Polymer Sci

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SYNOPSISMicroporous polypropylene hollow fibers with double layers were prepared by stretching double-layered polypropylene microtubes containing polymethylsilsesquioxane fillers: the relatively smaller filler in the inner layer and relatively larger filler in the outer layer. The resultant hollow fibers have a finely interconnected fibrous structure parallel to fiber axis. Their N2 gas permeabilities were measured to estimate the fibrous structure: tortuosity factor, effective porosity, and pore size. 0 1995 John Wiley & Sons, Inc.

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Section: Properties Of Microporous Pp Hollow Fibersmentioning

confidence: 99%

Microporous polypropylene hollow fibers with double layers

Nagō¹,

Mizutani²

1995

J of Applied Polymer Sci

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“…All these methods were commercially utilized. For instance, stretching thermoplastic sheets is well‐established for PTFE1–3 or Polyolefins 4–14. The effects of fillers, polmer mixtures, and process parameters on the forming of the micoporous system are intensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Nonrigid microporous PVC sheets: Preparation and properties

Trommer¹,

Morgenstern²

2009

J of Applied Polymer Sci

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The non-rigid microporous PVC films are prepared by mono-axially stretching nonporous sheets containing fillers which show an average particle size of 2 to 10 lm. The nonporous PVC film is generated from paste-like PVC. The influence of recipe components on the mechanical properties, morphological behavior and permeability to water vapor and water was investigated as well as the influence of the stretching ratio. Filled PVC pastes exhibit higher values for viscosity than those of pure polymer mixtures. For processing the compounded paste by means of a doctor blade a low viscosity is required meaning the amount of filler is limited by the resulting paste viscosity. Due to dewetting, the filler initiates the holes of the microporous system during the stretching process. Empirically, a minimum of about 15 vol % filler particles are necessary in order to achieve an interconnected air hole system. Varying the components PVC, plasticiser and filler, PVC membranes could be prepared with high water vapour permeability and high waterproofness simultaneously. To utilize the membranes commercially a continuous preparation process was developed.

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“…Microporous structures have previously been created by stretching films with CaCO 3 or another filler to create microvoids around the particles 19–24. Permeability measurements are a useful probe for characterizing the heterogeneous morphology 25, 26.…”

Section: Introductionmentioning

confidence: 99%

Breathable polymer films produced by the microlayer coextrusion process

Mueller

Topolkaraev

Soerens

et al. 2000

J. Appl. Polym. Sci.

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Fabrication of a breathable film by the microlayer coextrusion process is described. Poly(ethylene oxide) (PEO) was microlayered with a filled polyolefin, either CaCO3‐filled polyethylene or CaCO3‐filled polypropylene. The thickness of individual layers was varied by increasing the total number of layers in the microlayered film from 8 to 4096. The water vapor transport rate (WVTR) was measured for microlayer films that varied in composition and number of layers. Especially with the PP(CaCO3)/PEO system, systematic variation in composition and number of layers made it possible to obtain large changes in the WVTR. The results were related to the tortuousity of the pathway through the microlayer. The filled polyolefins acted as a barrier to water vapor transport through the hydrophilic PEO. As the individual layers were made thinner by increasing the total number of layers, the polyolefin layers changed from continuous to discontinuous. Tortuousity concepts were used to correlate the increase in WVTR with an effective aspect ratio of the discontinuous polyolefin layers. In addition to high WVTR values, the breathable films produced by microlayering PEO with a filled polyolefin exhibited excellent mechanical properties. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 816–828, 2000

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Microporous polypropylene sheets containing polymethylsilsesquioxane filler

Cited by 8 publications

References 10 publications

Microporous polypropylene hollow fibers with double layers

Microporous polypropylene hollow fibers with double layers

Nonrigid microporous PVC sheets: Preparation and properties

Breathable polymer films produced by the microlayer coextrusion process

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