Plasma-enhanced synthesis of maltodextrin-polydimethylsiloxane graft copolymers

Ether-extracted maltodextrin (MD) powder was surface functionalized under 1 3.56-MHz RF-SiCl4-plasma conditions, and consecutively in situ aminated and grafted using dichlorodimethylsilane. Survey and high-resolution X-ray pho toelectron spectroscopy, FTIR evaluations, fluorescence-labeling technique, SEM, and DTA/TG analyses prove the presence of a graft-copolymer layer on the modified starch-granule surfaces and the existence of a significantly c hanged surface morphology of the starch granules, as a result of the grafti ng reactions. The hydrophobic nature of the polydimethylsiloxane-grafted st arch and its significantly changed thermal behaviors were also evaluated. P otential applications of modified maltodextrins are discussed. (C) 2001 Joh n Wiley & Sons, Inc.