Study of oxygen-permeable polyurethane ionomer. II

Wang, C. L.; Chao, D. Y.

doi:10.1002/1097-4628(20001209)78:11<1932::aid-app120>3.0.co;2-v

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…Because the dimethyl dimethoxysilane with a strong hydrophilic property due to intermolecular interactions between PU resin molecules may form an expanded conformation with large porosities, the dimethyl dimethoxysilane‐based PU resin has high water vapor permeability. According to our previous study on oxygen‐permeable PU ionomer,2 dimethyl dimethoxysilane‐based PU ionomers possess high oxygen permeability. Interestingly, the water vapor absorption for the PU film appears to be independent of the concentration of PEG 400 in the presence of a fixed concentration of dimethyl dimethoxysilane used to prepare the PU resin, but it drastically increases with an increasing concentration of PEG 400 in the absence of a fixed concentration of dimethyl dimethoxysilane, as shown in Figure 8.…”

Section: Resultsmentioning

confidence: 96%

“…To overcome this poor situation, the PU synthetic leather industries should upgrade their production technology and/or develop new products to meet various demands. Therefore, we have attempted to help our PU synthetic leather industry to improve water vapor permeability and oxygen or air permeability1, 2 for PU leather made with modified PU resins.…”

Section: Introductionmentioning

confidence: 99%

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Water‐vapor‐permeable polyurethane resin

Chwang

Lee

Yeh

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The reaction of methylene diphenylene diisocyanate with ethylene glycol, dimethyl dimethoxysilane, dimethyl diethyloxysilene, and other additives in the presence of N,N-dimethylformamide and toluene to form the structure of water-vapor-permeable polyurethane (PU) resin was proven with Fourier transform infrared spectra. Experimental results clearly showed that the amount of oxygen that permeated the film made with the PU resin increased with an increase in the concentration of ethylene glycol, diethylene glycol, or triethylene glycol. This was due to an increased number of hydrophilic groups attached to the backbone of the PU resin molecules. These hydrophilic groups, because of the intermolecular interactions between PU resin molecules, made PU resin molecules form an expanded conformation with large porosities. Interestingly, the water vapor permeability of the PU resin appeared to increase with an increasing concentration of ethylene glycol, dimethyl dimethoxysilane, or dimethyl diethoxysilane but not to increase with an increasing concentration of diethylene glycol, triethylene glycol, or poly(ethylene glycol) with dimethyl dimethoxysilane. The former was due to intermolecular interactions resulting in an expanded conformation with large porosities, but the latter was due to intramolecular interactions resulting in a compact conformation or a micellelike structure with small porosities. Therefore, the water vapor permeability of the former increased, but the latter remained unchanged or decreased. Our experimental results suggest that the use of poly(ethylene glycol) 400, ethylene glycol, dimethyl dimethoxysilane, and other strong hydrophilic compound in the preparation of modified PU resins substantially raises the amount of water vapor diffusing into films made with these resins.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Water‐vapor‐permeable polyurethane resin

Chwang

Lee

Yeh

et al. 2002

J of Applied Polymer Sci

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Ionomers

Kim¹,

Luqman²,

Song³

2010

Encyclopedia of Polymer Science and Technology

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Since the early 1950s, the introduction of ionic groups has been recognized as a tool that can change the polymer properties. Thus, ionomers, polymers that contain a small amount of ionic groups along the polymer backbone chains, have received considerable attention from industrial as well as academic arenas. It has been found that ionomers exhibit unique properties and morphology, such as two T g s, high melt viscosity, transport behavior, and SAXS “ionomer” peak. In this article, we set out with a introduction on ionomers, and then move on to multiplet/cluster concepts. Subsequently, the glass transition temperatures of ionomers have been discussed. The next section is devoted to a discussion of physical properties of various ionomers, that is, polyethylene‐based ionomers, polytetrafluoroethylene‐based ionomers, polystyrene‐based ionomers, block ionomers, telechelic ionomers, and star ionomers. In the following section, three different types of plasticization using polar, non‐polar, and amphiphilic plasticizers are discussed. Then, various ionic interactions as a tool for miscibility improvement are described. The last section deals with the applications of ionomers briefly.

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Water vapor‐permeable polyurethane ionomer

Luo

Liou

Chin

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:The reaction of toluene diisocyanate with 2,2,3,3-tetrafluoro-1-propanol (fluoro compound) or 3-glycidoxypropyl trimethoxysilane(siloxane compound) and other additives to form the structure of the fluoro-based or siloxanebased polyurethane (PU) ionomer has been proven by infrared spectra. Experimental results indicated that the amount of water vapor permeability of the film made by fluoro-based or siloxane-based PU ionomer appeared to gradually increase with increasing concentration of the siloxane compound or fluoro compound, as a result of the formation of more porosities. Our experimental results also showed that the water vapor absorption was seen to be larger for the film made by siloxane-based PU ionomer film than for the film made by fluoro-based PU ionomer film, as a result of increased hydrophilic groups attached to the backbone of the PU ionomer molecule. For the film prepared by siloxane-based PU ionomer, both tensile strength and elongation appeared to increase with an increase in the concentration of siloxane compound. This may be the result of the intermolecular interaction between siloxane-based PU ionomer molecules themselves, thus enhancing the crosslinking capability of the ionomer molecules. On the other hand, both tensile strength and elongation for the film prepared by fluoro-based PU ionomer decreased with increasing concentration of the fluoro compound, as a result of intramolecular interaction greatly reducing the crosslinking capability of the ionomer molecules.

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Study of oxygen-permeable polyurethane ionomer. II

Cited by 6 publications

References 9 publications

Water‐vapor‐permeable polyurethane resin

Water‐vapor‐permeable polyurethane resin

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Water vapor‐permeable polyurethane ionomer

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