Silicon-containing poly(amide-ether)s

Abstract

New aromatic poly(amide‐ether)s (II) have been synthesized by solution polycondensation of various aromatic diamines having two ether bridges (I) with a diacid chloride containing silicon, namely bis(chlorocarbonylphenyl)‐diphenylsilane. These polymers are easy soluble in polar amidic solvents such as N‐methylpyrrolidinone or dimethylformamide and can be cast into thin flexible films or coatings from such solutions. They show high thermal stability with initial decomposition temperature being above 400°C. Their glass transition temperatures lie in the range of 220–250°C, except for polymer IIe which did not show a clear Tg when heated in a differential scanning calorimetry experiment up to 300°C. The large interval between the glass transition and decomposition temperatures of polymers Ia–Id could be advantageous for their processing via compression molding. The polymer coatings deposited by the spin‐coating technique onto silicon wafers showed a very smooth, pinhole‐free surface in atomic force microscopy investigations. The free‐standing films of 20–30 μm thickness show low dielectric constant, in the range of 3.65–3.78, which is promising for future application as high performance dielectrics. © 1998 John Wiley & Sons, Ltd.

Synthesis, characterization, and thermal studies of polyamides and polyimides containing two silarylene units in the main chain

“…Silicon‐containing polymers such as polycarbonates, polythiocarbonates, polyesters, polyurethanes, polyamides (PAs), and polyimides (PIs) in which the silicon atom is bonded to four organic groups have been described by several authors1–5 and also by our research group 6–10…”

“…Silicon-containing polymers such as polycarbonates, polythiocarbonates, polyesters, polyurethanes, polyamides (PAs), and polyimides (PIs) in which the silicon atom is bonded to four organic groups have been described by several authors [1][2][3][4][5] and also by our research group. [6][7][8][9][10] In this sense, in the last years we have focused our attention on the synthesis and characterization of condensation polymers derived from monomers containing a silicon atom in the main chain, describing the synthetic process, studying the thermal properties, glass-transition temperatures (T g 's), and thermal decomposition temperatures (TDTs), and relating the results to the presence of the silicon atom and the aliphatic or aromatic units bonded to it.…”

Silicon-containing poly(esters) with halogenated bulky side groups. Synthesis, characterization and thermal studies

“…[10][11][12][13] Cardo or bulky side groups have the objective of to reduce the intermolecular interactions between the polymeric chains due to the higher free volume, and consequently it is possible to improve the solubility and to decrease the T g due to the higher internal mobility of the polymeric chains. 13,16,17 In this sense, Thames 16,18 and Bruma 19,20 have described siliconcontaining polymers, with good solubility in common organic solvents and low T g values, but maintaining the thermal stability. 2,5,14 On the other hand, the introduction of exible groups in the repeating unit also has been used in order to improve the processability.…”

Polyesters based on two silarylene or germarylene moieties: Synthesis under phase‐transfer conditions

“…Silicon‐containing polymers in which the Si atom is bonded to four organic groups have been described by several authors. In this sense, the properties of polyamides, polyimides, polyesters (PEs), polycarbonates, polythiocarbonates, and others have been described and related to the molecular structure of the polymer chain 1–13. These works have reported a higher electronegativity of the Si atom in front of the C atom; as a result, the CSi bond has an ionic character with an increase in the solubility of polymers with silyl aromatic groups, but high thermal stability is maintained 3, 7.…”