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Shape memory polyurethanes based on recycled polyvinyl butyral. I. Synthesis and morphology

100%

Tsonev T., Herzog M., Nenkova S.

Open Chemistry

2013

vol. 11

issue 12

2058-2065

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.

Methylcellulose/SiO2 hybrids: sol-gel preparation and characterization by XRD, FTIR and AFM

76%

Rangelova N., Radev L., Nenkova S., Miranda Salvado I., Vas Fernandes M., Herzog M.

Open Chemistry

2011

vol. 9

issue 1

112-118

Methylcellulose (MC) / SiO2 organic / inorganic hybrid materials have been prepared from MC and methyltriethoxysilane or ethyltrimethoxysilane, and characterized by XRD, FTIR and AFM. XRD showed peak shifts. FTIR shows intermolecular hydrogen bonding between MC and SiO2. AFM depicts surface roughness which depends on the silica precursor and MC content. [...]

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2 Open Chemistry

1 2013

1 2011

2 Herzog M.

2 Nenkova S.

1 Miranda Salvado I.

1 Radev L.

1 Rangelova N.

1 Tsonev T.

1 Vas Fernandes M.

Search results

Shape memory polyurethanes based on recycled polyvinyl butyral. I. Synthesis and morphology

Methylcellulose/SiO2 hybrids: sol-gel preparation and characterization by XRD, FTIR and AFM