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A series of dipeptides of l-proline-l-amino acid and l-proline-d-amino acid were synthesized to evaluate the catalytic effect for asymmetric direct aldol reactions. In the direct aldol reaction, a catalyst of l-proline-l-amino acid achieves better enantioselectivity than the corresponding l-proline-d-amino acid catalyst. Solubility of the dipeptide catalysts in the solvents is a key point for achieving...
Graft interpenetrating polymeric networks of epoxy resin and polydimethylsiloxane (PDMS) were synthesized using 3-aminopropyltrimethoxysilane (γ-APS) as coupling agent. The dynamic mechanical analysis shows partially mutual compatibility between these two thermodynamically immiscible polymers. Due to the inappropriate domain size and the poor cohesive properties between epoxy resin and PDMS domain,...
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