U okviru ovog rada sintetisani su termoplastični poli(uretan-urea-siloksanski) kopolimeri sa mekim segmentima na
bazi hidroksipropil-terminiranog poli(dimetilsiloksana) (PDMS, Mn=1000 g/mol) i tvrdim segmentima na bazi 4,4′-
metilendifenildiizocijanata (MDI), dok je kao produživač lanca korišćen etilen-diamin (ED). Za sintezu je primenjen
postupak dvostepene poliadicije u rastvoru u prisustvu kalaj-bis-(2-etilheksanoata) kao katalizatora. Molski odnos
reaktanata iznosio je 1:2:1 (PDMS:MDI:ED), dok je kao rastvarač korišćena smeša THF/DMAc, 1/1, v/v. Ispitan je
uticaj temperature, koncentracije katalizatora i koncentracije monomera na obe faze reakcije. Struktura i sastav
sintetisanih kopolimera potvrđena je NMR i IR spektroskopijom. Veličina makromolekula okarakterisana je
viskozimetrijom razblaženih rastvora, [η]. The synthesis of thermoplastic poly(urethane-urea-siloxane)s based on hidroxypropyl-terminated poly(dimethylsiloxane)
soft segments (PDMS, Mn=1000 g/mol) is described in this paper. Hard segments consisted of 4,4′-methylene diphenyl
diisocyanate (MDI) wich was chain extended with ethylene diamine (ED). The syntheses were performed by two-step
polyadition method in the solution with stannous bis-(2-ethylhexanoate) as a catalyst. The molar ratio of the reactants was
1:2:1 (PDMS:MDI:ED), while the reactions were conducted in mixture of solvents, THF/DMAc, 1/1 v/v). The effects of
the experimental conditions (a temperature, catalyst and monomer concentrations) on the reaction were studied. The
structure, composition and size poly(urethane-urea-siloxane)s were investigated by NMR and IR spectroscopy and
viscometry of the dilute solutions [η].
