Synthesis and characterization of tetramethyl-p-silphenylene siloxane/dimethylsiloxane multiblock copolymer

Synthesis and Thermal Properties of Fully Aromatic Polysilarylenesiloxanes

“…[4][5][6] In addition, PDMS derivatives, polymethacrylates having bulky substituents like a tris(trimethylsiloxy)silyl group, poly(1-trimethylsilylpropyne) and so on, have been studied as pervaporation membranes, oxygen-enriching membranes and selectively transporting membranes in the fields of chemical and medicinal chemistry because of their high permeability of gases and organic components. 7 On the other hand, polysilarylenesiloxanes 8,9 and their copolymers [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] have been studied as high temperature elastomers whose thermal degradation temperatures (T d ) were greatly higher than those of PDMS.…”

“…[9][10][11][12][13][14][15] We had also reported their preparations and thermal properties. 10,[16][17][18][19] These copolymers have two major transi-tions at around À120 C corresponding to the T g of PDMS moiety and at À10 C related to the amorphous TMPS moiety. 19 And their T d was estimated at 300 C, lower than that of TMPS homopolymer.…”

Preparation of Fully Aromatic Polysilarylenesiloxanes by Melt Polycondensation and Their Thermal Properties

“…The common characteristics of these polymers are their high thermal degradation temperatures (T d 's) and low glass transition temperatures (T g 's), which are attributed to their flexible tetramethyldisiloxane units in the main chain. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] These characteristics are desirable for an elastomer, and are, however, undesirable for the heat-resistant materials such as a high-temperature coating and a low dielectric insulation material in semiconductor devices because the thermomechanical stability of these polymers is not enough at high temperature. Therefore, polysilarylenesiloxanes and their copolymers have never been used nothing but elastomers.…”

“…It was revealed that the melt polycondensation and simultaneous cross-linking reaction were effective to obtain the polysilarylenesiloxanes which have high thermal degradation temperature and high thermomechanical stability. [doi:10.1295/polymj.PJ2006004] KEY WORDS Polysilarylenesiloxane / Melt Polycondensation / Thermal Stability / Glass Transition / Thermomechanical Stability / Polysilarylenesiloxanes 1,2 and their copolymers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] have been investigated as high temperature elastomers. The common characteristics of these polymers are their high thermal degradation temperatures (T d 's) and low glass transition temperatures (T g 's), which are attributed to their flexible tetramethyldisiloxane units in the main chain.…”