期刊
MACROMOLECULES
卷 43, 期 17, 页码 7165-7172出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma100656e
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资金
- European Community [FP7/2007-2013, NMP3-SL-2009-228631]
- Russian Foundation of Basic Research [09-03-00342-a]
- NWO-RFBR
Addition polymerization of two tricyclononene monomers bearing one and two Si(CH3)(3) groups was performed in the presence of Pd-containing catalysts. The polymers were obtained with high yields and were completely saturated. Good mechanical and film forming properties are observed for the polymers prepared in the presence of Pd(OAc)(2)/B(C6F5)(3) catalyst. Their glass transition temperature was not observed until the onset of thermal decomposition (>370 degrees C) and the molecular weights are high (M-w up to 7 x 10(5)). Study of gas permeation parameters of the obtained poly[3-(trimethylsilyptricyclononene-7] and poly[3,4-bis(trimethylsilyl)tricyclononene-7] showed that both glassy polymers revealed substantially high gas permeability. Other transport characteristics (increase in permeability in the series C-1-C-4 alkanes and negative activation energies of permeation) indicate that these polymers reveal so-called solubility controlled permeation, which is typical for some extra-high permeability polymers. Positron annihilation lifetime spectroscopy indicated that both polymers are characterized by very large sizes of free volume elements.
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