Segmented polyurethanes based on poly(l-lactide), poly(ethylene glycol) and poly(trimethylene carbonate): Physico-chemical properties and morphology

Electrospun nanofibrous scaffolds of segmented polyurethanes based on PEG, PLLA and PTMC blocks: Physico-chemical properties and morphology

“…3a) and can be understood as an overlapping of β relaxations of each block [21]. The glass transitions of PEG and PTMC were not observed in the temperature range expected for neat homopolymers (−50°C to −25°C), whereas the samples present wide glass transitions above in the region denoted "SPU relaxations" (− 25°C to 25°C), as observed in both the E′ and E″ modulus curves ( Fig.…”

“…First, PLLA and PTMC homopolymers were obtained by ring-opening polymerization reactions from L-lactide and trimethylene carbonate monomers (purchased from Sigma Aldrich and Boehringer Ingelheim, respectively), using 1,4-butanediol as an initiator [20]. SPUs were synthesized as previously reported via a standard two-step polymerization [21]. Briefly, PEG, PLLA and PTMC macrodiols in a desired ratio were reacted with HDI at 40°C in a toluene solution.…”

“…SPUs based on PEG, PLLA, and PTMC were successfully synthesized using a two-step methodology described in previous studies [21,22]. The composition of the SPU was determined using 1 H NMR and expressed by the mass fraction of the macrodiol block content (PEG, PLLA and PTMC).…”

Synthesis and structure-property relationships of biodegradable polyurethanes

“…The intrinsic properties of each block, such as the hydrophilicity of PEO, stiffness of PLLA and elasticity of PTMC, are combined and modulated in the PUs. PTMC confers unique properties to ternary PUs owing to its partial miscibility with both PEO and PLLA [57].…”

Fully bio-renewable multiblocks copolymers of poly(lactide) and commercial fatty acid-based polyesters polyols: Synthesis and characterization

“…In one case, telechelic PLA diols are chain extended with one (or more) dihydroxyl terminated soft segments, by means of reaction with di-isocyanate [20,29,[32][33][34]37,39,43].…”