H-Bonding Self-assembled Template-directed Synthesis of a Reactive Amide-bridged Ladder Polyvinylsiloxane

A novel, reactive amide-bridged ladder polyvinylsiloxane (abbr. LP) with Mn = 2.4×104 was synthesized for the first time by means of aryl amide H-bonding self-assembled template. The regularity of LP was characterized by the XRD, 29Si NMR and DSC methods. XRD analysis demonstrated the ladder width w = 9.09 ? and the ladder thickness t = 3.89 ?, respectively, which are approximately consistent with the molecular simulation-calculated ones: w’= 10.60 ? and t’= 3.06 ?. 29Si NMR displayed a resonance peak with small half peak width, ?1/2 ~ 4 ppm, for the moiety [=Si(Vi)O2/2–]n of LP. Besides, as a collateral evidence, DSC measurement revealed a high glass transition temperature Tg = 225°C, suggesting high stiffness of the ladder main chain of LP.