Polycondensation polymers containing

Polycondensation polymers containing pendant carbazolyl groups have been prepared by polymerization of the N-carboxyanhydride of P-[2-(9-carbazolyl)ethyl]-... 

New heat-resistant polymers containing -iiitrophenyl-substituted quinoxaline units and imide rings as well as flexible amide groups have been synthesi2ed by polycondensation reaction of a dianainoquinoxaline derivative with diacid dichlorides (80). These polymers are easily soluble in polar aprotic solvents with inherent viscosities in the range of 0.3—0.9 dL/g in NMP at 20°C. AH polymers begin to decompose above 370°C. 

Polytitanosiloxane (PTS) polymers containing Si—O—Ti linkages have also been synthesized through hydrolysis—polycondensation or hydrolysis—polycondensation—pyrolysis reactions involving clear precursor sol solutions consisting of monomeric silanes, TYZOR TET, methanol, water, and hydrochloric acid (Fig. 2). These PTS polymers could be used to form excellent corrosion protection coatings on aluminum substrates (171). 

Reaction of polyhydroxy compounds with polybasic acids gives rise to condensation polymers containing ester (—COO—) groups. Because of the presence of these groups such polycondensates are known as polyesters and find use in such diverse applications as fibres, surface coatings, plasticisers, rubbers and laminating resins. These materials are discussed in detail in Chapter 25. 

In addition, polymers containing an odd number of silicon atoms in the siloxanylene segment can be prepared by this approach. However, reaction conditions employed in condensation of bis-silanols, III, with diaminosilanes (41) or siloxazanes (42) led to the cleavage of the carbonate group. Consequently, the recently reported silanol-acetoxysilane polycondensation reaction (43) was investigated for the polycondensation of bis-silanols, III, with diacetoxysilanes or diacetoxydisiloxanes (reaction 3). 

Carbazole-containing PODs have been obtained (53) by cyclodehydration (in the presence of POCl3) of polyhydrazides prepared by polycondensation of IV-ethyl-3,6-carbaZoledicarbonyl chloride with dihydrazides of the corresponding dicarboxylic acids. Thermal decomposition of the polymers containing aliphatic units occurs at 365-380°C, compared to 400-405°C for polymers containing aromatic units. 

A number of organometallic polymers containing metallocenes and metallocene analogues has been well-known for some time2. Because of the features of high-temperature stability and radiation resistance of the ferrocene nucleus, ferrocene-containing polymers are of special interest. Basically, these polymers may be divided into two classes the metallocene moiety is either located in a pendant group or in a backbone of the polymer chain. The former polymers have been synthesized by vinyl polymerization of vinyl metallocene monomers such as vinylferrocene. The latter polymers have been prepared by polycondensation of l,l -disubstituted metallocenes or metallocene dihalides with a.w-disubstituted monomers, and fell into two main types, (A) and (B). 

Recently, Shirai and Hojo25) have reported the synthesis of the soluble coordinate polymers containing metal-phthalocyanines in the main chain according to Scheme 2 (Eq. 7). The polymers obtained by polycondensation of metal-phthalocyanines bearing peripheral carboxy groups attached to various aromatics, -QH4-, -CsHr-CHz-CgH, exhibit higher conductivities (10-11 10-6 Q cm-1) than the corresponding monomer complexes. 

Polymers of benzoquinone, some tin-containing polymers, like poly(dialkyl tin maleate), zinc or cadmium containing polycondensates of 8-hydroxyquinoline with formaldehyde, polymers containing phosphorus, Ar,Ar -diphenylguanidine, 4-ami-no-1,2,3-triazole, benzothiazole, benzimidazole, benzothiazolone or dithiocarba-mate moieties were reported as thermostabilizers for PVC [67, 325-327]. 

The first linear polymers containing [2]catenanes in their backbones (mechanically linked main chain polymers, architecture A) were based on the Sauvage transition metal-coordinated catenanes. Polycondensation reactions were carried out between a diacid and a catenane diol to give a poly[2]catenane with Mn (600000) and Mw (4200000) based on polystyrene standards (Figure 4). 

Hereby, poly(p-phenylene) polymers containing ether and carbonyl linkages in the polymer backbone are accessible. By polymerization of the AB2 monomer 3,5-dibromobenzene boronic acid in a biphasic aqueous/organic medium, Kim and Webster obtained hyperbranched polyphenylenes [233]. Suzuki polycondensation in aqueous systems has proven to be a versatile method, which has been applied to the synthesis of various polymer types ]234]. 

Wang and co-workers reported the polycondensation of ferrocene with aromatic diazonium salts to give polymers containing iron in their backbones 115.199 The polymers were obtained in 38-69% yield and were insoluble in all organic solvents. The polymers did not display Tg and decomposed between 100 and 510°C. All the polymers showed ferromagnetism except for one that displayed paramagnetism. 

Mapolie and co-workers have reported the synthesis of polymers containing cyclopentadi-enylmetal complexes in their side chains.293,294 The polymers were prepared by homopolymerization of iron- or tungsten-containing vinyl monomers or copolymerization with styrene.293 Low molecular weight polyesters containing rhenium and iron complexes in their side-chains have also been prepared via polycondensations (Scheme 2.66).294 It was determined that by increasing the reaction time of the polymerization, the amount of insoluble material recovered increased. 

Various piperidine-functionalized polymers were obtained by polyaddition or polycondensation and contain ether, ester, siloxane, carbonate, amine, amide, urea or urethane construction units [8], Oligomeric siloxane 36 having n = 4 and analogous HAS-functionalized siloxanes [291] or polymers like 189 obtained by... 

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