Preparation and characterization of polyimide/mesoporous silica hybrid nanocomposites based on water-soluble poly(amic acid) ammonium salt

Effect of nanosilica on the dielectric properties and thermal stability of polyimide/SiO2nanohybrid

“…Nowadays, polymer-inorganic hybrid materials become a popular topic in material science because they inherit the suitable properties from both inorganic component (heat resistance, retention of mechanical properties at high temperatures, and low thermal expansion) and those of organic polymer (toughness, ductility, and processability) [1][2][3][4][5]. Polyimides (PIs) as high-performance organic matrix are used in the preparation of hybrids due to having excellent thermal stability with respect to decomposition, good mechanical properties, chemical stability against oxidation, and low dielectric constant.…”

Synthesis and Polymerization of Several New Maleimides Linked to Schiff Bases and Their Copolymers with Acrylonitrile

“…Subsequently the newly synthesized monomer (3-7) were introduced in free radical chain growth homopolymerization [20] using THF as solvent and AIBN (Azo bis iso butyronitrile) as initiator to produce the target new polymers (8-12) polymaleimides with pendent bulk Schiff base groups. Physical properties of monomers (3-7) and homopolymers (8)(9)(10)(11)(12) are shown in Tables-1 and 2. It was noticeable that incorporation of bulk pendent group in the new polymers exhibit them good solubility in all organic solvents beside most of them are either gummy products or solids with low softening points and these properties are fitted with the expected ones besides these properties made the polymer suitable for many applications like coating, adhesives , molding and as plasticizers.…”

“…respectively. Details of FTIR spectral data of homopolymers (8)(9)(10)(11)(12) are listed in Table-4. 1 H-NMR spectrum of homopolymer (10) showed signals at(=1.56)ppm and (3.89)ppm belong to aliphatic protons in imide ring and OCH 3 protons respectively.…”

“…Many efforts have been made to solve these problems since developing these properties can be an important approach to their use in many new fields [7][8][9][10][11][12][13]. Thus in the present work we try to improve polymaleimides properties by two ways the first one involved introducing of bulk Schiff base moieties as pendant groups in polymeric chains of polymaleimides ,while the second way involved introducing of maleimides substituted with Schiff bases into copolymerization with acrylonitrile since copolymerization is the most efficient method for modifying polymer properties [14][15][16][17].…”

Preparation and thermal properties of mesoporous silica/phenolic resin nanocomposites via in situ polymerization

“…Recently, mesoporous silica reinforced polymer composites have attracted considerable interests due to the possibility of improving the mechanical and thermal properties of polymers [9][10][11][12][13][14][15][16][17], and have even generated certain properties, for example, low dielectric constant [10, 12-14, 16, 17], low thermal expansion property [18][19][20][21], excellent friction and wear performance [22], and so on. It is a key factor that the incorporation of guest-monomer or polymer into the channels of mesoporous materials contributed to the dispersion of the additives in polymer matrix and the advancement of the properties of as-prepared composites.…”