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Effect of Hard Segment

The hard segments are formed from diisocyanates and low molecular weight diols or diamine chain extenders. Higher functional isocyanates and/or chain extenders may be used to provide chemical crosslinking. The hard segment domains are mainly responsible for reinforcing the soft polymer matrix and for the ultimate high-temperature performance of the urethane polymer. [Pg.188]

Miller J.A., Lin S.B., Hwang K.K.S., Wu K.S., Gibson P.E., and Cooper S.L. Properties of polyether-polyurethane block copolymers Effect of hard segment length distribution. Macromolecules, 18, 32, 1985. [Pg.161]

Yoshino M, Ito K, Kita H et al (2000) Effects of hard-segment polymers on C02/N2 gas-separation properties of polyethylene oxide)-segmented copolymers. J Polym Sci Part B Polym Phys 38(13) 1707-1715... [Pg.52]

Figure 9. Effect of hard-segment content on storage modulus and loss tangent of compression-molded FTMO/FTMT-segmented copolymers... Figure 9. Effect of hard-segment content on storage modulus and loss tangent of compression-molded FTMO/FTMT-segmented copolymers...
Effects of Hard-Segment Concentration on Copolymer Properties... [Pg.136]

Table III. Effect of Hard Segment Content and Diol Structure on Transition Properties... Table III. Effect of Hard Segment Content and Diol Structure on Transition Properties...
Figure 14. Effect of hard-segment weight fraction on the tensile stress at 100% elongation and tear strength of 4GT/PTMEG-T copolymers tensile stress is represented by solid line, tear strength by dashed line... Figure 14. Effect of hard-segment weight fraction on the tensile stress at 100% elongation and tear strength of 4GT/PTMEG-T copolymers tensile stress is represented by solid line, tear strength by dashed line...
Hergenrother, R.W., H.D. Wabers, and S.L. Cooper, Effect of hard segment chemistry and strain on the stability of polyurethanes in vivo biostability. Biomaterials, 1993, 14, 449 58. [Pg.332]

Z.S. Petrovic, J. Ferguson, N. Hudson, I. Javni, M. Vranes, The effect of hard segment structure on rheological properties of solutions of segmented polyurethanes. Ear. Polym. J. 28 (6) (1992) 637-642. [Pg.143]

M. Yoshino, K. Ito, H. Kita, K-1. Okamoto, Effect of hard-segment polymers on CO2/N2 gas separation properties of poly(ethylene oxide)-segmented copolymers, J. Polym. Sci. Part B Polym. Phys., 38, 1707-1715 (2000). [Pg.250]

C.P. Buckley, C. Prisacariu, A.A. Caraculacu, Effects of hard segment crystallinity on constitutive response of copolyurethane elastomers (Cambridge, UK, 2003), pp. 349-352. 12th International Conference on Deformation, Yield and Fracture of Polymers... [Pg.246]

Figure 14 Effect of hard segment content on mechanical properties. Figure 14 Effect of hard segment content on mechanical properties.
Several studies have been conducted on biostable polyurethanes to elucidate the effects of hard segment chemistry on polyurethane degradation rate. Tang et al. [104,105] observed the effects of hard segment chemistry and hard segment content... [Pg.15]

Miller J, et al. Properties of polyether-polyurethane block copolymers effects of hard segment length distribution. Macromolecules 1985 18 32 4. [Pg.18]

Santerre J, Labow R. The effect of hard segment size on the hydrolytic stability of polyether-urea-urethanes when exposed to cholesterol esterase. J Biomed Mater Res 1997 36(2) 223-32. [Pg.19]

Nakamae K, Nishino T, Asaoka S. Microphase separation and surface properties of segmented polyurethane—Effect of hard segment content. Int J Adhes Adhes 1996 16(4) 233-9. [Pg.20]

Wagener K, Matayabas Jr J. Quantitative determination of microphase separation effect of hard-segment length. Macromolecules 1992 25(21) 5591-6. [Pg.20]

Madhavan K, Reddy BSR. Synthesis and characterization of poly(dimethylsiloxane-ure-thane) elastomers effect of hard segments of polyurethane on morphological and mechanical properties. J Polym Sci Part A Polym Chem 2006 44(9) 2980-9. [Pg.21]

Fig. 3 Stress-strain curves showing the effect of hard segment content on the tensile behavior of various segmented polyurethane-urea copol3nners. (1) PTMO-2000-MDI-41-CA, (2) PTMO-2000-MDI-31-CA, and (3) PTMO-2000-MDI-23.3-CA. Fig. 3 Stress-strain curves showing the effect of hard segment content on the tensile behavior of various segmented polyurethane-urea copol3nners. (1) PTMO-2000-MDI-41-CA, (2) PTMO-2000-MDI-31-CA, and (3) PTMO-2000-MDI-23.3-CA.
The dynamic mechanical results in Figure 5 demonstrate the effect of hard segment content for a fixed molecular weight of the polyether soft segment. A rubbery plateau, from the E curves, is observed to be composition-dependent and extends to 200 C for 23.3 hard segment content material and near 300 C for the sample with hard segment... [Pg.112]

LEE Lee, H.K., Kim, J.Y., Kim, Y.D., Shin, J.Y., and Kim, S.C., Liquid-liquid phase separation in a ternary system of segmented polyethenuethane/dimethylformamide/ water effect of hard segment content. Polymer, 42, 3893,2001. [Pg.748]

Turner R B, Spell H L and Vanderhider J A (1982) The Effect of Hard Segment Content on a Crosslinked Polyurethane RIM System, in Reaction Injection Molding and Fast Polymerization Reactions (Ed. Kresta J E) Plenum Press, New York, pp. 63-70. [Pg.103]

Birch A J, Stanford J L and Ryan A J (1989) The effects of hard segment content on microphase sepai ation and physical properties of non-lineai , segmented copolyureas formed by RIM, Polym Bu//22 629-635. [Pg.104]

Ryan A J, Bergstrom T B, Willkomm W R and Macosko C W (1991) Thermal, mechanical, and fracture properties of copolyureas formed by reaction injection molding Effects of hard segment structure, J Appl Polym Sci 42 1023-1039. [Pg.104]

Nakamae K, Nishino T, Asaoka S and Sudaryaiito S (1996) Microphase Separation and Surface Properties of Segmented Polyurethane - Effect of Hard Segment Content, Int J Adhesion and Adhesives 16 233-239. [Pg.104]

See other pages where Effect of Hard Segment is mentioned: [Pg.135]    [Pg.68]    [Pg.292]    [Pg.625]    [Pg.135]    [Pg.592]    [Pg.188]    [Pg.14]    [Pg.15]    [Pg.16]    [Pg.402]    [Pg.14]    [Pg.15]    [Pg.16]   


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