Author： Kawakami Yusuke Kishimoto Norihisa Takeshita Kosuke Watanabe Tsuyoshi
Publisher： Taylor & Francis Ltd
ISSN： 1568-5551
Source： Designed Monomers & Polymers, Vol.2, Iss.1, 1999-01, pp. : 93-101
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Abstract
Poly[(4-oligodimethylsiloxanyl)styrene]s were synthesized by radical polymerization of the corresponding monomers. Poly[4-{3-trimethysiloxy-1,1,1,5,5,5-hexamethyl-1 ,3,5-trisi)oxan-3-yl}styrene] with a controlled molecular weight was also obtained by anionic polymerization. Quantitative evaluation of the spin-lattice relaxation time (T1) was made at each silicon atom of the side-chains by solid-state 29Si-NMR. The influence of the degree of polymerization on T1 was not significant when the degree of polymerization was high enough. It was found that the closer the silicon atom to the main chain, the longer the T1, value of the silicon atom. T1 values at a temperature 35 °C below the glass transition temperature (Tg) were measured in order to obtain some quantitative insight into the mobility of the side-chains.
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