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ITS » Scientific Articles » Luar ITS Posted by firstname.lastname@example.org at 16/12/2014 17:12:08 • 1034 Views
ENZYMATIC SYNTHESIS OF LIGNIN SILOXANE HYBRID FUNCTIONAL POLYMERS
Author : PRASETYO, ENDRY NUGROHO; KUDANGA, TUKAYI ( 197310142000121001; none ) FISCHER, ROMAN; EICHINGER, REINHARDNYANHONGO, GIBSON S; GUEBITZ, GEORG M
This study combines the properties of siloxanes and lignin polymers to produce hybrid functional
polymers that can be used as adhesives coating materials and for multi functionalized thin-coating films. ligninsilica hybrid copolymers were synthesized by using a sol-gel process. Laccases from Trametes hirsuto were used to oxidize lignosulphonates to enhance their reactivity towards siloxanes and then were incorporated into siloxane precursors undergoing a sol-gel process. In vitro copoly merization studies using pure lignin monomers with aminosilanes or ethoxytrimethylsilane and analysis by 29Si NMR spectroscopy revealed hybrid products. Except for kraft lignin an increase in lignin concentration positively affected the tensile strength in all samples. Similarly the viscosity gen erally increased in all samples with increasing lignin concentration and also affected the curing time.