Amorphous phase-segregated copoly(ether)esterurethane thermoset networks with oligo(propylene glycol) and oligo[(rac-lactide)-co-glycolide] segments: synthesis and characterization.
Completely amorphous copoly(ether)ester networks based on oligo(propylene glycol) and oligo[(rac-dilactide)-co-glycolide] segments were synthesized by crosslinking star-shaped hydroxyl-telechelic cooligomers using an aliphatic low-molecular weight diisocyanate. Two different network architectures were applied exhibiting differences in the phase-separation behavior. For networks from oligo(propylene glycol)-block-oligo[(rac-lactide)-co-glycolide] triols (G(3)OPG-bl-OLG) only one glass transition was obtained. However, networks from a mixture of oligo(propylene glycol) triols (G(3)OPG) and oligo[(rac-lactide)-co-glycolide] tetrols (P(4)OLG) with a ratio of components in a certain range show two glass transition temperatures (T (g)) being attributed to two segregated amorphous phases. In this way a wide spectrum of mechanical properties can be realized and adjusted to the requirements of a specific application.
Centre of Biomaterial Development, Institute of Polymer Research, GKSS Research Center, Kantstr. 55, 14513, Teltow, Germany.
Jörg
J
Zotzmann
Armin
A
Alteheld
Marc
M
Behl
Andreas
A
Lendlein
D002621:Chemistry / Q000379:methods; D003432:Cross-Linking Reagents / Q000737:chemistry; D003460:Crystallization; D005898:Glass; D017953:Isocyanates / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry*; D011098:Polyglactin 910 / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D019946:Propylene Glycol / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature; D014508:Urea / Q000737:chemistry*; D014520:Urethane / Q000138:chemical synthesis / Q000737:chemistry*
D003432:Cross-Linking Reagents; D017953:Isocyanates; D011091:Polyesters; D011108:Polymers; D011098:Polyglactin 910; D014520:Urethane; D019946:Propylene Glycol; D014508:Urea