Synthesis and study of silylene-diacetylene polymers

Abstract

Synthesis and Study of Silylene-Diacetylene PolymersRecently we reported1 that trichloroethylene, C12C= CHC1, is cleanly converted by n-butyllithium to dilithioacetylene, LiC=CLi, from which in situ quenching with R2SiCl2 produced the silylene-acetylene polymers, fR2SiC=CK• Thermal conversion of these polymers to silicon carbide/carbon revealed that neither the acetylenic carbons nor the silicon volatilized and thus always remained in the char. We now report that silylenediacetylene polymers of relatively high molecular weights can be conveniently prepared by a similar "one-pot" route.

Synthesis and functionalization of Poly[5,5′-(silylene)-2,2′-dithienylene]s using silyl triflate intermediates†

“…S cm 1 (17). On the basis on these data, the number of silicon atoms which are present between two dithienylene units exerts no significant influence on conductivities.…”

“…Organosilicon polymers containing a regular alternating arrangement of silylene or polysilylene units and p-electron systems, such as phenylene, [1][2][3][4][5][6][7] ethynylene, [8][9][10][11][12][13][14][15] diethynylene, [16][17][18][19] furylene 20,21 and oligothienylene [22][23][24][25][26][27][28][29][30][31][32] sequences, in the main chain have received increasing attention, because these polymers can be used as functional materials such as photoresists, semiconducting materials and precursors of silicon-containing ceramics.…”

Synthesis and characterization of novel silicon-containing aromatic bispropargyl ether resins and their composites

“…[1][2][3][4][5][6][7][8][9][10][11] Some silicon-containing thermosetting polymers with ethynyl or ethynylene groups have been explored and developed. Itoh et al [12][13][14][15] prepared poly(phenylsilyleneethynylene-1,3-phenyleneethynylene) [-Si(Ph)H-C C-C 6 H 4 -C C-] n (abbreviated MSP) by a dehydrogenative coupling polymerization reaction between phenylsilane and m-diethynylbenzene in the presence of magnesium oxide.…”

Thermal cure behavior and pyrolysis of methyl‐tri(phenylethynyl)silane resin

“…[3][4][5] Many studies of silicon-containing organic-inorganic hybrid polymers composed of [ASiR 2 ACBCA](R ¼ alkyl or phenyl) units have been reported because of their excellent thermal and oxidative properties. [6][7][8][9][10][11] Itoh reported that poly[(phenylsilylene)ethynylene-1,3-phenyleneethynylene] [ASi(ph) HACBCAC 6 H 4 ACBCA] (abbreviated MSP), which was prepared by the dehydrogenative coupling polymerization reaction between phenylsilane and mdiethynylbenzene in the presence of magnesium oxide, had extremely high thermal stability. [12][13][14] In our previous article, [15][16][17] synthesis, characterization, and thermal cure kinetics of methyl-tri(phenylethynyl) silane (MTPES) had been reported and thermoset possessed excellent thermal and oxidative properties.…”