PREPARATION OF PYRIDYL-TERMINATED OLIGODIMETHYLSILOXANE AND SILOXANE-GRAFTED COPOLYMERS CONTAINING PYRIDYL GROUPS AT THE SIDE-CHAIN ENDS

Citation
T. Aoyagi et al., PREPARATION OF PYRIDYL-TERMINATED OLIGODIMETHYLSILOXANE AND SILOXANE-GRAFTED COPOLYMERS CONTAINING PYRIDYL GROUPS AT THE SIDE-CHAIN ENDS, Polymer, 33(7), 1992, pp. 1530-1536
Citations number
15
Journal title
ISSN journal
00323861
Volume
33
Issue
7
Year of publication
1992
Pages
1530 - 1536
Database
ISI
SICI code
0032-3861(1992)33:7<1530:POPOAS>2.0.ZU;2-7
Abstract
The preparation of hetero difunctional oligodimethylsiloxanes (ODMSs) was carried out. The ODMSs contained 2-(4-pyridyl)ethyl (Py) or 2-(2,6 -di-t-butyl-4-pyridtl)ethyl (DBPy) at one end and a reactive group, su ch as 3-methacryloxypropyl (MP) or hydrosilyl (H), at the other end. T hese oligosiloxanes were prepared by anionic ring-opening polymerizati on of hexamethylcyclotrisiloxane (D3) initiated with silanolate anions containing pyridyl groups. To obtain the initiators, novel silanol co mpounds containing Py or DBPy groups were prepared from 4-methylpyridi ne and 2,6-di-t-butyl-4-methylpyridine, respectively. The average degr ee of polymerization could be controlled by changing the ratio of D3 a nd the initiator. Py-ODMS-MP and DBPy-ODMS-MP were copolymerized with methyl methacrylate or butyl methacrylate hydrosilylation of DBPy-ODMS -H with vinyldimethylsilated polysulphone (PSF) was carried out to aff ord PSF/DBPy-ODMS graft copolymer. The gas permeability coefficients o f nitrogen, oxygen and carbon dioxide for the copolymer membranes were evaluated.