Synthesis and mechanical properties of organic-inorganic hybrid materials from lignin and polysiloxanes.
The preparation of silica-containing organic-inorganic hybrid materials composed of kraft lignin, alkoxysilanes, and organic linkers was investigated. 3-Glycidyloxypropyltrimethoxysilane, 3-(triethoxysilyl)propylisocyanate (IPTES), and bis(trimethoxysilyl)hexane were selected as the most promising linkers. The best materials obtained showed improved mechanical and thermal properties compared with lignin itself. The reaction of the hydroxyl groups with IPTES and the sol-gel reaction between the organic linker molecules were studied by attenuated total reflectance FTIR and solid-state ²⁹Si magic-angle spinning NMR spectroscopy. The homogeneous composition was demonstrated by electron microscopy and energy-dispersive X-ray spectroscopy mapping. The mechanical properties were investigated by microindentation and dynamic mechanical thermal analysis.
Technische Chemie, Universität des Saarlandes, 66123 Saarbrücken, Germany.
Andreas K W
AK
Lippach
Ramona
R
Krämer
Michael R
MR
Hansen
Stephan
S
Roos
Klaus
K
Stöwe
Markus
M
Stommel
Gerhard
G
Wenz
Wilhelm F
WF
Maier
D060326:Chemistry Techniques, Synthetic; D008031:Lignin / Q000737:chemistry*; D055595:Mechanical Phenomena; D012821:Silanes / Q000737:chemistry; D012833:Siloxanes / Q000138:chemical synthesis* / Q000737:chemistry*
D012821:Silanes; D012833:Siloxanes; D008031:Lignin; C071717:trimethoxysilane