Selected topics in biomedical polyurethanes. A review

Gogolewski, Sylwester

doi:10.1007/bf01410115

Cited by 223 publications

(154 citation statements)

References 154 publications

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“…그 중에서 폴리우레 탄 아크릴레이트는 우수한 물리적 화학적 물성으로 인하여 다양하게 사용되어 왔다 5,6) . 또한 무공해, 무 독성, 난가연성 등의 특성이 각광받고 있다 7,8) .…”

Section: 서 론unclassified

Solventless UV Curable Material for Low Cost System

Kim¹,

Lee²,

Lee³

et al. 2017

Transactions of the Korean hydrogen and new energy society

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>> In this study, Poly-urethane acrylate (PUA) was synthesized by the reaction between Polycaprolactonetriol (PCLT) and Isophorone dissocyanate (IPDI) and hybridized with inorganic materials. Tetraethylortho silicate (TEOS) and nano clay (Closite 20A) were used as inorganic particles. For the hybridization of TEOS with PUA, sol-gel method is used, in which TEOS is made into spherical particle in the firsthand. In the case of Nano clay, hybridization is carried out through the dispersion as Nano clay has a layered structure. The solution of PUA hybrid was made into a film after UV curing and its thermo and electrical properties were measured. The experimental analysis and result demonstrate that the PUA hybrid shows an improved thermal properties and lower dielectric constant than that of the non-hybrid PUA. The trend of improved properties was different depending on structure of inorganic materials.

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Section: 서 론unclassified

Solventless UV Curable Material for Low Cost System

Kim¹,

Lee²,

Lee³

et al. 2017

Transactions of the Korean hydrogen and new energy society

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“…This means that they may be processed using methods typical of thermoplastics, i.e. extrusion, calendaring or injection [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…TPUs are polyaddition reaction products involving aromatic (mainly 1,1 0 -methylenebis (4-isocyanatobenzene) (MDI)) or aliphatic diisocyanates (predominantly 1,1 0 -methylenebis (4-isocyanatocyclohexane) (HMDI) and 1,6-diisocyanatohexane (HDI)), aliphatic linear polymer diols (polyetherdiols, polyesterdiols or polycarbonate diols) as well as the chain extenders (usually butane-1,4-diol), which in the case of less reactive substrates require the presence of a catalyst [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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New thermoplastic polyurethane elastomers based on aliphatic diisocyanate

Puszka

Kultys

2016

J Therm Anal Calorim

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New segmented polyurethanes (SPURs) were synthesized by one-step melt polyaddition from a poly (oxytetramethylene)diol of M n = 1000 g mol -1 (PTMO) or a poly(hexamethylene carbonate)diol of M n = 860 g mol -1 (PHCD) as soft segments, 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane (IPDI), and 2,2 0 -methylenebisas an unconventional chain extender. Furthermore, some of SPURs were modified by the addition of a carboxylic group by means of 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid. The effects of the kind and amount of the polymer diol and chain extender used on the structure and properties of the polymers were studied. The polymers were examined by attenuated total reflection Fourier transform infrared spectroscopy, gel permeation chromatography, thermogravimetric analysis (TG), TG-FTIR, differential scanning calorimetry (DSC), Shore A/D hardness and tensile testing. The obtained SPURs were amorphous, colourless, high molar mass materials which showed elastomeric or plastic properties. Their T g s were in the range of -51 to 29°C. It was observed that the polymers with a PHCD demonstrated a better segmental miscibility (higher T g s), as well as greater hardness and tensile strengths, but smaller elongations at break than PTMO-based ones. All of the polymers exhibited a relatively good thermal stability.

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“…Polyurethanes (PUs) first found a niche in biomedical applications mainly because of their unique mechanical properties, particularly fatigue resistance, tensile strength, and abrasion Graig 1983;Gogolewski 1989;Hepburn 1992;Furukawa 1997), but also because of their good bio-and hemocompatibility properties (Boretos 1980;Wang and Cooper 1983;Yoon and Ratner 1988;Gogolewski 1989). PU membranes are a good candidate for blood oxygenation devices as the type, length, ratio, and crystallinity of the different monomers as well as the method of membrane preparation determine the bulk properties responsible for the final mass transfer properties (Yilgör and Yilgör 1999;Hoshi et al 2000;Jonquières et al 2002) and the surface properties that affect bio-and hemocompatibility (Yoon and Ratner 1988;Gogolewski 1989). …”

Section: Introduction To Extracorporeal Blood Oxygenationmentioning

confidence: 99%

Electrodialysis with Bipolar Membranes

Strathmann¹

2016

Encyclopedia of Membranes

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Quite often during the operation of a system for the treatment of gases, it is necessary to expand it for treating greater streams. In some cases, future expansion is contemplated even during the initial phase of a project. In other cases, it could be a necessity not foreseen during system design phase (Miller and Stöcker 1989; Brunetti et al. 2010).Membrane system expansion is very easy, since this only requires the addition of identical modules. This is the advantage offered by the modularity of membrane units and the reduced equipment and control systems required for operating it. In comparison, considering the other reference technologies for gas separation, PSA and absorption systems can also be expanded, but it requires additional design considerations and adds cost in the initial phase of the project.The cryogenic units cannot be expanded if it is not foreseen during the design phase. Generally they can be over-dimensioned, and a capacity increase is often obtained without modification to the cold box itself through addition of a tail gas compressor. ReferencesBrunetti A, Bernardo P, Drioli E, Barbieri G (2010) Membrane engineering progresses and potentialities in gas separations. In: Yampolskii Y, Freeman B (eds) Membrane gas separation. Wiley, New York, pp 281-312 Miller GQ, Stöcker J (1989) Selection of a hydrogen separation process NPRA annual meeting, 19-21 Mar, San Francisco Effective DiffusivityRenzo Di Felice University of Genova, Genova, ItalyEffective diffusivity is a convenient parameter which is introduced when diffusion takes place in non-homogenous media. Consider, for example, the case where a species is diffusing through porous particles, such as reactant diffusing inside a catalytic solid. In this case, the molecules have to travel for a longer distance given that the pores of the catalytic particles are not straight, and moreover diffusion takes place over a smaller area due to the solid being wall impermeable. These effects are taken into account by defining an effective diffusivity as where e is the particle void fraction and thereby takes into account the reduced flow area available and t is the tortuosity which considers the longer distance traveled by the molecules. It should be stressed, however, that more often than not, the parameter inside the parenthesis is utilized as a fitting factor derived from experimental data rather than predicting factor from the solid physical characteristics. These result in the reported tortuosity factor, for example, to assume rather wild values, as high as ten, which are difficult to justify with geometrical arguments alone. The concept of effective diffusivity is also applied for the case of species diffusing in heterogeneous media, such a polymer filled with a second, less permeable, material. Maxwell (1873) has obtained an exact expression, in the case of composite media filled with spheres, for the effective diffusivity given aswhere D is the diffusion coefficient in the primary media, D s the diffusion coefficient through the spheres, and f th...

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Selected topics in biomedical polyurethanes. A review

Abstract: Published literature on biomedical polyurethanes is reviewed. Selected topics concerning chemistry, structure-property relations, tissue-material interactions, surface properties, applications, processing, and sterilization, etc., are discussed.

Cited by 223 publications

References 154 publications

Solventless UV Curable Material for Low Cost System

Solventless UV Curable Material for Low Cost System

New thermoplastic polyurethane elastomers based on aliphatic diisocyanate

Electrodialysis with Bipolar Membranes

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