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-pyridyl)ethyl (DBPy) at one end and a reactive group, such as 3-methacryloxypropyl (MP) or hydrosilyl (H), at the other end. These oligosiloxanes were prepared by anionic ring-opening polymerization of hexamethylcyclotrisiloxane (D3) initiated with silanolate anions containing pyridyl groups. To obtain the initiators, novel silanol compounds containing Py or DBPy groups were prepared from 4-methylpyridine and 2,6-di-t-butyl-4-methylpyridine, respectively. The average degree of polymerization could be controlled by changing the ratio of D3 and the initiator. Py-ODMS-MP and DBPy-ODMS-MP were copolymerized with methyl methacrylate or butyl methacrylate to yield the desired graft copolymers containing pyridyl groups at the side chain ends. Also, the hydrosilylation of DBPy-ODMS-H with vinyldimethylsilylated polysulphone (PSF) was carried out to afford PSF/DBPy-ODMS graft copolymer. The gas permeability coefficients of nitrogen, oxygen and carbon dioxide for the copolymer membranes were evaluated.
Посилання на статтю:
Preparation of pyridyl-terminated oligodimethylsiloxane and siloxane-grafted copolymers containing pyridyl groups at the side chain ends / Takao Aoyagi, Yuriko Takamura, Tomoko Nakamura and Yu Nagase // Polymer. – 1992. – Vol 33. – P. 1530-1536.