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Silicone-urethane copolymers

Yilgor, E. Tulpar, A. Kara, S. Yilgor, I. High Strength Silicone-Urethane Copolymers Synthesis and Properties. In Silicones and Silicone-Modified Materials Clarson, S. J., Fitzgerald, J. J., Owen, M. J., Smith, S. D., Eds. ACS Symposium Series 729 American Chemical Society Washington, DC, 2000 pp 395—407. [Pg.688]

Yilgor E, Tulpar A, Kara S et al. (2000) High strength silicone-urethane copolymers synthesis and properties. ACS Symp. Ser. 729 395 07. [Pg.97]

Angioflex Abiomed (Danvers, MA) Silicone-urethane copolymer MDI-PTMEG BD-Sil Good blood compatibility Difficult to make... [Pg.326]

High Strength Silicone-Urethane Copolymers Synthesis and Properties... [Pg.395]

Investigation of the tensile behavior of silicone-urethane copolymers and thek compari n with those of silicone-urea copolymers (18) or THF based polyether-urethai bomologs yielded mteresting and mewhat unexpected results. Tte data on... [Pg.402]

As expected, the moduli and the ultimate strengths of silicone-urethane copolymers increase with increask bard segment content in the copolymer. On the other hand there is a small drop in the elongation at break as the amount of the hard segment is increased. [Pg.404]

High molecular weight silicone-urethane copolymers with urethane hard segment contents of up to 50% by weight were synthesized in high yields. Thermal, thermomechanical and microscopic characterization of these copolymers clearly indicated the formation of two-phase systems with very good phase separation. [Pg.405]

Thermal analysis (TGA) data of these siliconated block copolymers revealed that they are thermally more stable than the reference materials, poly(tetrahydrofuran block urethane) and poly(ethyleneglycol block urethane) copolymers. The thermal stability was found to depend on the silicone content, with stability increasing as the silicone content in the structure increases. [Pg.188]

ChronoSil AdvanSource Biomaterials Silicone-polycarbonate—urethane copolymer... [Pg.352]

Table I gives the compositions of silicone-urethane and pob ether-urethane segmented copolymers prepared in this study. Table I gives the compositions of silicone-urethane and pob ether-urethane segmented copolymers prepared in this study.
In some applications silicone polyethers are used as cell openers to achieve a desired content of open cells within the foam. Silicone polyethers with nonpolar polyethers can act in this way. Their solubility decreases during the course of urethane formation, finally giving the silicone polyethers a eell opening incompatibility. Aromatically substituted polyether side ehains as a building a block in silicone polyether copolymers have reeently been deseribed for this application [42],... [Pg.599]

Hydroxyl-containing silicon material with the hydroxyl groups attached directly to a silicon atom are combined together to react to form silanol-functionalised urethane prepolymers that can cure at ambient temperatures in the presence of moisture to form polysiloxane polyurethanes. For instance, physical blends of a polypropyleneoxide polyol intermediates and an organic-silicone block copolymer-based polyol intermediates have been prepared to improve elongation and reduced... [Pg.114]

Scheme 29 illustrates the synthetic routes to three classes of silicone-urethane block copolymers that were reported by Benrashid et al. It is interesting that the solvents from which the siloxane-urethane block coplymers were cast have a significant influence on microphase segregation. For example, films cast from THF had a higher siloxane concentration at the surface relative to polymers cast from DMAc/ CH2CI2 or dioxane. [Pg.190]

The principal kinds of thermoplastic resins include (1) acrylonitrile-butadiene-styrene (ABS) resins (2) acetals (3) acrylics (4) cellulosics (5) chlorinated polyelliers (6) fluorocarbons, sucli as polytelra-fluorclliy lene (TFE), polychlorotrifluoroethylene (CTFE), and fluorinated ethylene propylene (FEP) (7) nylons (polyamides) (8) polycarbonates (9) poly elliylenes (including copolymers) (10) polypropylene (including copolymers) ( ll) polystyrenes and (12) vinyls (polyvinyl chloride). The principal kinds of thermosetting resins include (1) alkyds (2) allylics (3) die aminos (melamine and urea) (4) epoxies (5) phenolics (6) polyesters (7) silicones and (8) urethanes,... [Pg.1316]

Surfactants for urethane and related polymer foams are usually silicone-surfactants. These surfactants generally are copolymers of poly(dimethylsiloxane) [-Si(CH3)2-0-] , oxyalkylene chains, e.g., polyethylene oxide chain (EO) , and polypropyene oxide chains, (PO) . The copolymers can be linear, branched or pendant types. The surfactants have different functions, i.e., emulsifying, foam stabilizing, and cell-size control. [Pg.38]

Surfactants. Silicone surfactants, which are used in rigid urethane foams, can be used as surfactants for pyranyl foam jn-eparation. The silicone surfactants are block copolymers of polydimethylsiloxane-polyoxyalkylene ether in either linear or pendant structures. [Pg.141]

See other pages where Silicone-urethane copolymers is mentioned: [Pg.396]    [Pg.401]    [Pg.396]    [Pg.401]    [Pg.275]    [Pg.5456]    [Pg.604]    [Pg.660]    [Pg.165]    [Pg.285]    [Pg.395]    [Pg.401]    [Pg.402]    [Pg.404]    [Pg.404]    [Pg.296]    [Pg.559]    [Pg.1280]    [Pg.14]    [Pg.135]    [Pg.86]    [Pg.20]    [Pg.309]   


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