Isophthaloyl chloride polycondensation

The AICI3-catalyzed polycondensation of diphenyl ether with a mixture of terephthaloyl chloride and isophthaloyl chloride is a relatively inexpensive route to poly(ether ketone)s. The polymerizations were carried out in chlorinated solvents... 

The polyamide-hydrazide 7 was prepared by solution polymerization in anhydrous dimethylacetamide from terephthaloyl chloride and p-amino-benzhydrazide at ca. 10 °C. The polyamide 8 resulted from the polycondensation of m-phenylenediamine with isophthaloyl chloride at —20 °C, whereas 9 was prepared by the reaction of terephthaloyl chloride with the complex diamine l,3-bis(3-aminobenzamide)benzene at —20 °C. The water flux and salt rejection through these membranes were summarized in Table 5. The polyamide-hydrazide (7) membranes were prepared from polymer solutions containing 6 7% polymer (Mv 3 34,000) by casting on glass plates. The material was placed in an oven for 30 60 min and coagulated in deionized... 

Polymers based on two different repeated units, compound 3, can be synthesised via polycondensation of the diamine with isophthaloyl chloride. The diamine resulted... 

Aromatic polyamide fibers, better known as aramid fibers, have been defined as a long chain synthetic polyamide in which at least 85% of the amide linkages are attached directly to two aromatic rings [42] The first significant material of this type was introduced in 1961 by Du Pont as Nomex. It is poly(m-phenyleneisophthalamide), prepared from m-phenylenediamine and isophthaloyl chloride by interfacial polycondensation. 

Lu et al. [2] fabricated TFC NF membranes, in which the skin layer was either polyesters or polyamides. The monomers used in the polycondensation reactions are as follows (1) alcohol (bisphenol-A, BPA), (2) amine (metaphenylene diamine and piperazine), and (3) acid chloride (isophthaloyl chloride, terephthaloyl chloride [3,4], and trimesoyl chloride). They reported that the composite layer (active layer) was smoother than that of the substrate membrane. Upon formation of the active layer, the pore size decreased, which resulted in a flux decrease and a retention increase. Although it is unclear, they seem to maintain that their results confirm Hirose et al.s conclusion, i.e., the flux increases with an increase in surface roughness [Ij. 

With a few exceptions, interfacial polycondensation has remained a laboratory method for the synthesis of polymers, since diacyl chlorides are too expensive for commercial production. The exceptions include the polycondensation of bisphenols with phosgene (see Section 26.5.1) and the synthesis of aromatic polyamides, from m-phenylene diamine, isophthaloyl chloride, and terephthaloyl chloride (Section 28.2.4). The method is also used to give wool a fluff-free finish by producing a polycondensate from sebacoyl chloride and hexamethylene diamine on the wool fiber. 

Matsuda and co-workersproduced products of form 5 from the inter-facial polycondensation of isophthaloyl chloride in chloroform with 1,2-bis-(4-carboxyphenoxy) ethane in aqueous sodium hydroxide. 

Cholesteric LC homo/copolyesters can be synthesized from isosorbide, methyl hydroquinone, and isophthaloyl chloride by solution polycondensation method in presence of mild organic base. The properties of the polymers by this method conform to any other method in terms of molecular weight, LC texture, stability etc. [58]. 

When 02 + 2 polycondensations have the purpose to prepare high molar mass polymers, three experimental procedures may be considered (in contrast to a-b monomers). These three procedures should here be discussed for pyridine-promoted polycondensations of 1,6-hexanediol and isophthaloyl chloride (IPCl) [12], because these polycondensations are the only systematic study known to the author. 

A polyether-amide with a heat distortion temperature of 198°C has been prepared by Hitachi by interfacial polycondensation of 2,2-bis-[4-(4-aminophen-oxy)phenyl]propane (VIII) with a mixture of isophthaloyl- and terephthaloyl-chloride (IX and X) (Figure 18.29). 

In this study, polyesters [XII] having syringyl-type biphenyl units were synthesized from 4,4 -dihydroxy-3,3, 5,5 -tetramethoxybiphenyl (XI) which was prepared from 2,6-dimethoxyphenol (11). As shown in Scheme 6, poly esterification of XI with terephthaloyl, isophthaloyl and sebacoyl chloride were carried out by the low temperature solution polycondensation and by the interfacial polycondensation. The polyterephthalate with jjinh = 1.42 dl/g was obtained by the interfacial poly condensation. The polyisophtha-late with f7 nh = 0.73 dl/g and the polysebacate with Jj nh = 0.43 dl/g were obtained by the low temperature solution polycondensation. 

For example, the method for production of aromatic polyketones by means of Friedel-Craft polycondensation of bis (arylsilanes) with chlorides of aromatic dicarboxylic acids (isophthaloyl-,terephthaloyl-,4,4 -oxydibenzoylchloride) at 20 °C in environment of dissolvent (1,2-dichlor-ethane) in the presence of aluminum chloride is proposed in Ref [331], The polyketones have the intrinsic viscosity more than 0.37 deciliter/gram (at 30 °C, in concentrated H SO ), glass transition temperature is 120-231 °C and melting point lies within 246-367 °C. The polyketones start decomposing at a temperature of 400 °C, the temperature of 10% loss of mass is 480-530 °C. 

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