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001-es BibID:	BIBFORM062341
Első szerző:	Lakatos Csilla (környezetmérnök)
Cím:	Segmented linear shape memory polyurethanes with thermoreversible Diels-Alder coupling: Effects of polycaprolactone molecular weight and diisocyanate type / Cs. Lakatos, K. Czifrák, R. Papp, J. Karger-Kocsis, M. Zsuga, S. Kéki
Dátum:	2016
ISSN:	1788-618X
Megjegyzések:	Segmented linear polyurethanes (PUs) containing Diels-Alder (DA) adduct were synthesized in toluene solutionfrom poly("-caprolactone) (PCL, Mn = 10, 25 and 50 kg/mol), diisocyanate (methylene diphenyl diisocyanate (MDI), 2,4-toluene diisocyanate (TDI), 1,6-hexamethylenediisocyanate, (HDI)), furfurylamine (FA) and bismaleimide (BMI). Theorder of the segments in the PUs was -PCL-MDI-FA-BMI-. The PUs were characterized by size-exclusion chromatography(SEC), different spectroscopic (1H-NMR, attenuated total reflectance Fourier-transform infrared, AT-FTIR), thermal andmechanical analysis (differential scanning calorimetry, DSC, dynamical mechanical analysis, DMA). The DA and retro-DAreactions were identified by 1H-NMR for both the synthesized PU and the coupling components (i.e. FA and BMI). Tensilemechanical and shape memory (SM) properties of the PUs were also determined. The DA coupling in the PU was improvedby heat treatment above the melting temperature (Tm) of PCL. DMA traces showed a plateau-like region above Tm of PCLconfirming the presence of a physical network the netpoints of which are given by the hard segments including the DA couplers.This feature suggested good SM behavior that was confirmed both qualitatively and quantitatively.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény hazai lapban smart polymers polyurethanes Diels-Alder adduct mechanical properties thermal properties
Megjelenés:	Express Polymer Letters. - 10 : 4 (2016), p. 324-336. -
További szerzők:	Czifrák Katalin (1978-) (vegyész) Papp R. Karger-Kocsis József (1950-) (vegyészmérnök) Zsuga Miklós (1944-) (polimer kémikus) Kéki Sándor (1964-) (polimer kémikus)
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