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Urethanes copolymers

Synthesis of siloxane-urethane copolymers from various hydroxyalkyl-terminated PDMS oligomers and aliphatic diisocyanates, such as tetramethylene- and hexame-thylene diisocyanate and HMDI was reported 333,334). Reactions were conducted either in chloroform or 1,4-dioxane and usually low molecular weight, oily products were obtained. No data were available on the molecular weights or the thermal and mechanical properties of the copolymers obtained. These products were later cross-linked by a peroxide. Resulting materials were characterized by IR spectroscopy and water contact angle measurements for possible use as contact lenses. [Pg.41]

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]

Garret, J. T., X. Ruijian, J. Cho, and R. James. "Phase Separation of Diamine Chain Extended Poly(Urethane) Copolymers FTIR Spectroscopy and Phase Transions." Polymer 44 (2003) 2711-2719. [Pg.144]

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]

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]

High purity and high molecular weight siloxane-urea/urethane copolymers, (1), were prepared by Kuepfer [ 1] at ambient temperature using dibutyl tin diacetate as catalyst under anhydrous conditions. Additional siloxane-urea/urethane copolymer derivatives were prepared by Schafer [2]. [Pg.26]

Random Urea-Urethane Copolymer of Polyether Glycol,... [Pg.259]

Entry Polyisobutylene cis Content (%) Mw (daltons) PDI Urethane Copolymer (daltons) PDI... [Pg.540]

The results for a Py-GC/MS analysis of a carbonate urethane copolymer are shown below for poly[(1,6-hexyl-1,2-ethyl carbonate)diol 4,4 -methylenebis(phenyl isocyanate)]-co-[1,4-butandiol 4,4 -methylenebis(phenyl isocyanate)]. The idealized structure for this copolymer is shown below ... [Pg.567]

Aminimides can also be copolymerized with other vinyl monomers, yielding acrylic resins. Hence, either urethane homopolymers or urethane copolymers can thus be obtained. [Pg.1017]

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

Example 5.6 The tendency for hard segment-soft segment phase separation in urethane copolymers increases in the order polybutadiene and/or polyisoprene soft segment polyether soft segment > polyester soft segment. Explain. [Pg.154]

Storage Hygroscopic air-sensitive store under nitrogen Uses Soft segment for elastomer formulation for coatings, adhesives, sealants, fibers, thermoplastic and cast urethanes, copolymers ManufJDistrib. Aldrich BASF Trade Names PolyTHF 1000 PolyTHF 2000... [Pg.1294]

Uses Soft segment for elastomer formulation for coatings, adhesives, sealants, fibers, thermoplastic and cast urethanes, copolymers Manuf./Distrib. Aldrich http //www.sigma-aidrich.com, BASF http //www.basf.com Trade Name Synonyms PolyTHF 1000 [BASF http //www.basf.com, BASF AG http //www.basf.de], PolyTHF 2000 [BASF http //www.basf.com, BASF AG http //WWW. basf. de]... [Pg.3473]

Wang and co-workers [4] have discussed the thermal stability of PDMS-urethane copolymers using a combination of differential scanning calorimetry, dynamic mechanical analysis and cone calorimetry. [Pg.179]

Garrett JT, et al. Phase separation of diamine chain-extended poly(urethane) copolymers FTIR spectroscopy and phase transitions. Polymer 2003 44(9) 2711-9. [Pg.19]

CarboSil TSPCU DSM Corporate S ilicone-polycarbonate—urethane copolymer... [Pg.352]

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

In this study siloxane-urethane copolymers were prepared by the reaction of a,(o-hydroxyhexyl terminated PDMS oligomers, 4,4 -isocyanatocyclohexylmethane and 1,4-butanediol, which was used as the chain extender. Influence of the reaction solvent, PDMS molecular weight and hard segment content on the overall molecular weight and thermal and mechanical properties of the products were investigated. Performance of PDMS based polyurethanes were compared with those of PTMO based systems, with similar structures and compositions. [Pg.397]

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]

See other pages where Urethanes copolymers is mentioned: [Pg.40]    [Pg.40]    [Pg.40]    [Pg.41]    [Pg.254]    [Pg.38]    [Pg.402]    [Pg.218]    [Pg.224]    [Pg.189]    [Pg.66]    [Pg.297]    [Pg.165]    [Pg.6696]    [Pg.396]    [Pg.401]    [Pg.402]   
See also in sourсe #XX -- [ Pg.96 ]



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