TY - JOUR A1 - Tsonev, Tsvetomir A1 - Herzog, Michael A1 - Nenkova, Sanchi T1 - Shape memory polyurethanes based on recycled polyvinyl butyral. I. Synthesis and morphology JF - Central European Journal of Chemistry N2 - Shape memory polyurethanes (SMPUs) were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), hexane-1,6-diol (HD), polypropylene glycol (PPG), and recycled polyvinyl butyral (PVB). Dynamic mechanical analysis, differential scanning calorimetry and Fourier transformation infrared attenuated total reflection spectroscopy was used to characterize the poly (vinylbutyral-urethanes). Micro-phase domain separation of hard and soft segments and phase inversion were investigated. Increasing the hard segment content, i.e., average hard segment molecular weight, leads to an increase in the degree of micro-phase separation, hard domain order and crystallinity. The crystalline hard segment structures combined with the elastic nature of soft segment matrix provide enough physical and chemical crosslinks to have shape memory effect. Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9664 SN - 2391-5420 VL - 11 IS - 12 SP - 2058 EP - 2065 ER - TY - JOUR A1 - Tsonev, Tsvetomir A1 - Herzog, Michael A1 - Nenkova, Sanchi T1 - Shape memory polyurethanes based on recycled polyvinyl butyral. I. Synthesis and morphology JF - Central European Journal of Chemistry N2 - Shape memory polyurethanes (SMPUs) were synthesized by 4,4′-diphenylmethane diisocyanate (MDI), hexane-1,6-diol (HD), polypropylene glycol (PPG), and recycled polyvinyl butyral (PVB). Dynamic mechanical analysis, differential scanning calorimetry and Fourier transformation infrared attenuated total reflection spectroscopy was used to characterize the poly (vinylbutyral-urethanes). Micro-phase domain separation of hard and soft segments and phase inversion were investigated. Increasing the hard segment content, i.e., average hard segment molecular weight, leads to an increase in the degree of micro-phase separation, hard domain order and crystallinity. The crystalline hard segment structures combined with the elastic nature of soft segment matrix provide enough physical and chemical crosslinks to have shape memory effect. KW - polyvinyl butyral KW - shape memory KW - polyurethane KW - thermal analysis KW - IR spectroscopy Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-20052 VL - 11 IS - 12 SP - 2058 EP - 2065 PB - Versita ER -