Surface Tension of Polysilanes Having Oxyethylenic Side Chains

Abstract

Polysilanes having oxyethylenic side chains, {CH3-Si-CH2CH2CH2O(CH2CH2O)mR1}n where (m = 0,1,2,3) and R1 = CH3 and C2H5, have been prepared. A polysilane of m = 3 and R = CH3 is soluble in alcohols, acetonitrile, and water. Surface tensions of these polysilanes are larger than those of the polysilanes ever reported. While dispersion component stays almost constant(ca. 30–40 dyn/cm), polar component increases with increasing oxygen atom numbers in the side chain. Copolymers also keep the high values of surface tension.

Intuitive Understanding of σ Delocalization in Loose and σ Localization in Tight Helical Conformations of an Oligosilane Chain

“…[1][2][3][4] They are sensitive to the backbone conformation and as ar esult lead to phenomena such as thermochromism, [5][6][7][8][9] piezochromism, [10,11] electrochromism, [12] ionochromism, [13,14] and solvatochromism. [15] Also their single-molecule electrical conductivity appearst od epend on conformation.…”

Near-UV, circular dichroism, and fluorescence spectra of a rigid rodlike helical polysilane bearing trietheral moiety in ethanol/water

“…An introduction of oligoetheral pendant to flexible coiled polysilane backbone is well known to afford the great solubility to alcohol and, in some cases, to water, 21,22 whereas a family of 2's is soluble only in hydrocarbons and tetrahydrofuran. Polysilane 1, as expected, was readily soluble in ethanol, hydrocarbons, and a mixture of ethanol and water, but was insoluble in pure water.…”

Silicon-Containing Polymers

“…Schwesinger's non-ionic phosphazene base [131] has recently been explored as an extremely effective initiator of the ROP of cyclosiloxanes [132,133]. An interaction with a proton donor, such as methanol, leads to the formation of silanolate with a very bulky phosphazenium cation, having a positive charge effectively delocalised by the resonance effect, Equation 38 [132].…”