So. Hammouch et al., SYNTHESIS AND CHARACTERIZATION OF MONOFUNCTIONAL POLYDIMETHYLSILOXANES WITH A NARROW MOLECULAR-WEIGHT DISTRIBUTION, Polymer, 36(2), 1995, pp. 421-426
Polydimethylsiloxanes (PDMSs) with a narrow molecular weight distribut
ion and fitted at one chain end with a hydrogenodimethylsilyl or a dim
ethylvinylsilyl function were prepared by the anionic ring-opening rea
ction of hexamethylcyclotrisiloxane in a 50 vol% benzene-tetrahydrofur
an solution, followed by endcapping with chlorodimethylsilane or chlor
odimethylvinylsilane. The experimental conditions were chosen on the b
asis of preliminary experiments in order to minimize the contribution
of reshuffling reactions and it was checked that the possible formatio
n of difunctional species was negligible. The functionalization was qu
antitative. The functional polymers were characterized by i.r. spectro
scopy and by s.e.c. alpha-Hydrogenodimethylsilyl and alpha-dimethylvin
ylsilyl PDMS were prepared in the molecular mass range between 2500 an
d 40 000 g mol(-1).