Amorphous phase-segregated copoly(ether)esterurethane thermoset networks with oligo(propylene glycol) and oligo[(rac-lactide)-co-glycolide] segments: synthesis and characterization

Zotzmann, J.; Alteheld, Armin; Behl, Marc; Lendlein, Andreas

doi:10.1007/s10856-009-3761-x

Cited by 20 publications

(11 citation statements)

References 20 publications

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“…Shape‐memory polymer networks were derived using oligo‐(caprolactone) dimethacrylate as crosslinker for n ‐butylacrylate . Amorphous copoly(ether)ester networks based on oligo(propylene glycol) and oligo[( rac ‐dilactide)‐ co ‐glycolide] segments resulted in shape memory systems . Many of these systems are reported to possess shape memory properties by virtue of the PCL or poly(propylene) segments incorporated chemically into the matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of phenol end functional switching segments on the shape memory properties of epoxy‐cyanate ester system

Biju

Nair²

2014

J of Applied Polymer Sci

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The effect of phenol end functional shape memory oligomers on the shape memory properties of an epoxy‐cyanate ester resin system was examined. The basic resin system consisted of diglycidyl ether of bisphenol A (DGEBA) cured with bisphenol A dicyanate (BADC). For conferring the shape memory properties, the switching segment (SS) components selected are α, ω‐phenol‐terminated poly(tetramethyleneoxide) (PPTMO), poly(ε‐caprolactone) (PPCL), and poly(propylene glycol) (PPPG). Epoxy‐cyanate ester blend of defined composition was analyzed for thermal, mechanical, thermo‐mechanical, and shape memory properties at two concentrations of the three SSs. The transition temperature of heavily SS loaded matrix increased in the order: PPTMO < PPCL < PPPG commensurate with crystallizability of SS segments at ambient. For same reason flexural property showed an increasing trend. This is in league with the increased crystallizability of the shape memory polymer components. The shape fixity, recovery extent, and recovery time followed a reverse order: PPPG < PPCL < PPTMO. In contrast to the alcohol terminated shape memory components, phenol terminal groups were helpful in integrating the shape memory segments into the matrix by way of reaction with both epoxy and cyanate groups. The coreaction was conducive for achieving better shape memory properties and decreasing the transition temperature. A direct relation existed between the modulus ratio and the shape recovery property. Higher concentration of the SSs caused a diminution in transition temperature but enhanced the shape memory properties, though the mechanical properties were adversely affected. The shape recovery increased with increase in temperature. All polymers possessed good mechanical properties and thermal stability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41196.

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Section: Introductionmentioning

confidence: 99%

Effect of phenol end functional switching segments on the shape memory properties of epoxy‐cyanate ester system

Biju

Nair²

2014

J of Applied Polymer Sci

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“…Incorporation of poly(propylene glycol) led to microscopic phase segregation within the amorphous networks and thus resulted in two distinct glass transitions with one T g between − 59 and − 25 ° C and the second T g between 39 and 53 ° C as well as good elastic properties at ambient temperature with ε R up to 500%. The mechanical properties could be controlled by independently altering the two parameters, content and molecular weight of the poly(propylenglycol) segment [47] .…”

Section: Covalent Network With Amorphous Switching Domains T Trans mentioning

confidence: 99%

Biodegradable Shape‐Memory Polymers

Behl¹,

Zotzmann²,

Schroeter³

et al. 2011

Handbook of Biodegradable Polymers

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“…As the elastic properties of polymer networks are significantly influenced by the homogeneity of crosslinks [18], a control of the number of arms and the molecular weight of the PTHF precursors are highly desirable. In general, linear and star-shaped PTHF can be obtained by ringopening polymerization of tetrahydrofuran (THF) by living cationic polymerization, which enables a good control of the reaction and the polymer structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hydroxy-telechelic Four-arm Star-shaped Oligo(tetrahydrofuran), Their Crosslinking, and Thermomechanical Investigation of the Poymer Network

et al. 2012

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Here the synthesis of hydroxy-telechelic four-arm star-shaped oligotetrahydrofuran ( 4 PTHF) with controllable molecular weight was explored, which was perfomed as living cationic ringopening polymerization of THF using pentaerythritol and trifluoromethanesulfonicanhydride as initiation system. The molecular weights of the 4 PTHF were a function of the reaction time. A polymer network was prepared from the hydroxy-telechelic 4 PTHF precursor by crosslinking with diisocyanate and the shape-memory properties were determined. High values for R f and R r > 98% were obtained even at high programmed elongations, which suggest the 4 PTHF-network as a promising shape-memory material. These materials might have a great potential, as the upscaling of synthesis could be successfully demonstrated.

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Amorphous phase-segregated copoly(ether)esterurethane thermoset networks with oligo(propylene glycol) and oligo[(rac-lactide)-co-glycolide] segments: synthesis and characterization

Cited by 20 publications

References 20 publications

Effect of phenol end functional switching segments on the shape memory properties of epoxy‐cyanate ester system

Effect of phenol end functional switching segments on the shape memory properties of epoxy‐cyanate ester system

Biodegradable Shape‐Memory Polymers

Synthesis and Characterization of Hydroxy-telechelic Four-arm Star-shaped Oligo(tetrahydrofuran), Their Crosslinking, and Thermomechanical Investigation of the Poymer Network

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