Synthesis and studies on starch-g-quaternary amino polysiloxane graft copolymers

The functional quaternary amino polydimethylsiloxane, e.g. 3-chloro-2-hydro xypropyl, methyl, n-propyl, quaternary amino polydimethylsiloxane was prepa red and reacted with starch to obtain water soluble starch-g-quaternary ami no polydimethylsiloxane (SQPDMS) copolymer. Monofunctional epoxy terminated polydimethylsiloxane (PDMS) was reacted with n-propylamine to give n-propy l aminohydroxy polydimethylsiloxane which on further reaction with epichlor ohydrin followed by quaternization using methyliodide gave 3-chloro-2-hydro xypropyl, methyl, n-propyl quaternary amino polydimethylsiloxane (QPDMS). S QPDMS copolymer has higher surface activity than quaternary amino PDMS and cationic starch derivatives containing hydrocarbon moieties.