Aromatic diacids, poly

The Suzuki reaction was also used to prepare the polyketone since this particular reaction tolerates the subsequent step (Scheme 6.19).135 Palladium-catalyzed cross-coupling of aromatic diacid chlorides and bis(trimethylstannane) monomers was utilized to prepare poly(arylene ether ketone)s.136... 

Poly (anhydrides) based on aliphatic-aromatic diacids. Macromolecules. In Press. 

High-molecular-weight fluorine-containing aromatic poly(benzoxazole)s have not been obtained either by the direct solution polycondensation in PPA at 200°C or by the low-temperature solution polycondensation in DMAc at 0 to 5°C from 2,2-bis(3-amino-4-hydroxyphenyl)-l,l,l,3,3,3-hexafluoropropane and aromatic diacid derivatives because the fluorine-containing monomer has low nucleophilicity owing to the presence of the electron-withdrawing hexafluoroiso-propylidene unit. 

Mamyama et al.25 have obtained high-molecular-weight poly(benzoxazole)s by the low-temperature solution polycondensation of A,A 0,0 -tetrais(trimethyl-silyl)-substituted 2,2-bis(3-amino-4-hydroxyphenyl)-l,l,l,3,3,3-hexafluoro-propane (25) with aromatic diacids and subsequent thermal cyclodehydration of the resulting poly(o-hydroxy amide)s in vacuo. In this method, aromatic diamines with low nucleophilicity are activated more positively through the conversion to the /V-silylated diamines, and the nucleophilicity of the fluorine-containing bis(o-aminophenol) can be improved by silylation. 

Domb, A., and Langer, R. Poly(anhydrides) III. (Polyanhydrides) based on aliphatic-aromatic diacids. Macromolecules 22 3200—3204, 1989. 

Several different approaches to the construction of poly(arylene-carborane)s were initially considered (Scheme 1). These included (i) nucleophilic polycondensation between a bis-phenol and an activated, carborane-based dihalide in the presence of base, a reaction used for the synthesis of commercial polyetherketones and polyethersulfones,4 (ii) electrophilic polycondensation between an aromatic diacid and a carborane-based diarylether in the presence of a strong-acid catalyst,5 and (iii) direct, homogeneously-catalysed coupling of a carborane-based dihalide.6 However,... 

The first aromatic polyanhydrides synthesized were poly(isophthalic acid) (IPA) and poly(terephthalic acid) (TA). A few common aromatic polyanhydrides are shown in Table 1. Homopolymers of aromatic diacids... 

Polyanhydrides of diacid monomers containing aliphatic and aromatic moieties, poly[p-carboxyphenoxyalkanoic anhydride], were synthesized by either melt or solution polymerization with molecular weights of up to 44600 (Table 8) [52]. 

Blends of liquid crystal polymer (LCP) polyester, LCP poly(ester amide) and PAS exhihit a reduced melt viscosity.LCP polyesters are made hy polymerizing aromatic diacids with diols or hy polymerizing aromatic hydroxy acids, e.g. 4-hydroxyhenzoic acid and 6-hydroxy-2-naphthoic acid. In LCP poly(ester amide)s, some of the hydroxyl groups in the monomers are replaced with amino groups. 

The idea to substitute aliphatic diacids with aromatic diacids goes back to the mid 1950s. In the literature, PPAs are not always explicitly declared as such, but are rather treated as a group of PAs. For this reason, a literature search using poly(phthalamide) will not cover all relevant entries. 

Fully aromatic polyamides form from reactions of aromatic diacid chlorides and aromatic diamines. An example is formation of poly(m-phenylenediamine isophthalamide) ... 

An aramid polymer can be crosslinked in the presence of polymers from acrylic acid or methacrylic acid [48]. The crosslinked polymer is obtained by polymerizing a monomeric aromatic diamine with a monomeric aromatic diacid in the presence of poly(meth) acrylic acid, followed by a curing step. The curing step is simply a thermal curing. The crosslinked aramid polymer is then crosslinked via its amide bonds. Here it is not necessary to modify the aramid backbone with other monomers. 

S. Mallakpour, H. Seyedjamali, One-pot poly-amidation reaction of optically active aromatic diacid containing methionine and phthalimide moieties with aromatic diamines under micro-wave irradiation and traditional heating, Eur. Polym. J. 44 (11) (2008) 3615-3619. 

Jiang, H.L., Zhu, K.J., 2001. Synthesis, characterization and in vitro degradation of a new family of alternate poly(ester-anhydrides) based on aliphatic and aromatic diacids. Biomaterials 22, 211-218. 

Aliphatic polyesters and polyesters formed from aromatic diacids and aliphatic diols eg, poly(ethylene terephthalate) and poly(butylene terephthalate) (3) cannot decompose by reversion of the polymerization, because the water, or alcohol, eliminated in the synthesis is no longer available. They initially decompose by /3-C—H transfer reactions via a six-membered transition state ... 

The reactants concentration also plays a determinant role. It has been stated that on plotting the inherent viscosity of poly(amic acid) against the initial concentration of monomers, a curve with a maximum can be attained. This maximum is presumably different for each monomers combination and solvent, but from the available data it is accepted that for high molecular weight to be obtained 0.4 to 0.8mol/L monomer concentration is to be used [22-24]. The figures correlate well with data reported for the synthesis of aromatic polyamides from aromatic diamines and aromatic diacid chlorides [25]. 

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