Aromatic acetals as new initiators for cationic polymerization of isobutylvinyl ether

Citation
K. Satoh et al., Aromatic acetals as new initiators for cationic polymerization of isobutylvinyl ether, MACROMOLEC, 33(3), 2000, pp. 748-753
Citations number
17
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULES
ISSN journal
00249297 → ACNP
Volume
33
Issue
3
Year of publication
2000
Pages
748 - 753
Database
ISI
SICI code
0024-9297(20000208)33:3<748:AAANIF>2.0.ZU;2-S
Abstract
A series of aromatic acetals (1) from substituted phenols [CH3CH(OiBu)OAr; Ar = C6H5, p-CH3OC(O)C6H4, p-CH3C(O)C6H4, p-NO2C6H4, 4-NO2-2,6-di-C6H5-C6H2 , o-CH3C(O)C6H4] were employed as new initiators in conjunction with Lewis acids (MtX(n)) for the living cationic polymerization of isobutyl vinyl eth er (IBVE). Most of them were quantitatively synthesized by the addition of the corresponding phenols to IBVE. When coupled with aluminum chloride (AlC l3), 1 gave polymers with broad molecular weight distributions (MWDs), wher eas the addition of ethyl acetate (10 vol %) to these systems led to the fo rmation of controlled polymers whose number-average molecular weights (M-n) were directly proportional to monomer conversion, with relatively narrow d istributions (M-w/M-n similar to 1.2). The aromatic acetals in conjunction with tin halides (SnX4; X = Cl, Br) gave relatively high meso contents (81% ) in toluene at -78 degrees C.