High-pressure synthesis and properties of aliphatic-aromatic polyimides via nylon-salt-type monomers derived from aliphatic diamines and benzophenonetetracarboxylic acid

Abstract

Aliphatic polyimides (P‐XBTA) having inherent viscosities of 0.4–1.4 dL/g were readily synthesized by the high‐pressure polycondensation of the salt monomers, composed of aliphatic diamines having various methylene chain lengths (X = 4–12) and 3,3′,4,4′‐benzophenonetetracarboxylic acid (BTA), under 200–250 MPa at 200–320°C. The salt monomers with odd‐numbered methylene units were found to be more susceptible to crosslinking than those containing even‐numbered methylene chains. The polyimides having even‐numbered methylene units were highly crystalline, whereas those with odd‐numbered methylene chains were crosslinked and therefore amorphous with only one exception, i.e., P‐11BTA. The thermal behavior of these polymers was also studied. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 39–47, 1998

Preparation and Characterization of 4,4′‐Bis(4‐aminophenoxy)diphenyl Sulfone Based Fluoropoly(ether‐imide)/Organo‐Modified Clay Nanocomposites

“…[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The most common procedure used in this investigation is a simplified one-pot-two-step polymerization process [40] as shown in Scheme 2. The polymerization was carried out until completion of the 1 st step shown in reaction scheme, and (6FDA þ p-SED) poly(ether-amic acid) (6F-PEAA) was successfully synthesized from 2,2 0 -bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 4,4 0 -bis(4-aminophenoxy)diphenyl sulfone (p-SED), as follows.…”

“…Several procedures for the preparation of polyimides are reported in the literature 25–39. The most common procedure used in this investigation is a simplified one‐pot‐two‐step polymerization process40 as shown in Scheme .…”

Development of functional polymers with cyclic ether moieties. I. Synthesis and properties of polyesters with dioxane moiety in the main chain

“…A typical procedure is given for polycondensation with 1 and suberoyl chloride to obtain the polyester 3 6 with six methylene units. 1 (0.5 g, 3.38 mmol) and suberoyl chloride (0.71 g, 3.38 mmol) were placed into a vessel equipped with a magnetic stirring bar.…”

“…Peaks of 2 ranging from 5 to 7°suggest some smecticlike ordered structures in 3 3 -3 7 . 6 These results support the consideration of the role of dioxane moiety in enhancing the tendency toward orientated structures of the corresponding polymers in their solid states.…”

Semiaromatic Polyimides based on Bis(Aminomethyl)Bicyclo[2.2.1]Heptane

“…As most aromatic polyimides, including Kapton ® , are insoluble in organic solvents and strongly coloured yellow or reddish-yellow, much effort has been concentrated on achieving greater solubility and colourlessness [1][2][3][4][5][6][7][8]. As a result of these endeavours a number of literature reports have appeared describing the preparation of polyimides incorporating non-aromatic monomers [9][10][11][12][13][14][15][16][17], such as cycloaliphatic dianhydrides and/or non-aromatic diamines. In recent years we have synthesized soluble and colourless semiaromatic polyimides using dianhydrides with a polyalicyclic structure (figure 1) and aromatic diamines [18][19][20][21][22][23].…”