Dicarboxyl terminated poly

Further, a dispersed second phase minimizes the residual stress and reduces detrimental craze formation. A series of formulations have been described. The components of the PAI are trimellitic acid anhydride, MDI, adipic acid, isophthalic acid, dicarboxyl terminated poly(acrylonitrile-co-butadiene). The solvent is NMP. A slurry of poly(tetrafluoroethyl-ene) is added to the polymer. 

Gopakumar et al. [10] reported the in situ compatibilization of poly(phenylene sulfide) (PPS)/wholly aromatic thermotropic liquid crystalline polymer (TLCP) Vectra A950 blends by reactive extrusion. The authors prepared the in situ compatibilized PPS/TLCP blends in a twin-screw extruder by reactive blending of PPS and TLCP in the presence of dicarboxyl-terminated poly(phenylene sulfide) (DCTPPS). Block copolymer was formed during reactive blending, by transesterification reaction between carboxyl... 

Fully aromatic polyamides are synthesized by interfacial polycondensation of diamines and dicarboxylic acid dichlorides or by solution condensation at low temperature. For the synthesis of poly(p-benzamide)s the low-temperature polycondensation of 4-aminobenzoyl chloride hydrochloride is applicable in a mixture of N-methylpyrrolidone and calcium chloride as solvent. The rate of the reaction and molecular weight are influenced by many factors, like the purity of monomers and solvents, the mode of monomer addition, temperature, stirring velocity, and chain terminators. Also, the type and amount of the neutralization agents which react with the hydrochloric acid from the condensation reaction, play an important role. Suitable are, e.g., calcium hydroxide or calcium oxide. 

Carbodiimides are also used as catalysts in the formation of polyamides from dicarboxylic acids and diisocyanates. The carbodiimide catalyst is generated in situ from the diisocyanate using dimethylphospholene oxide as the catalyst. In this manner segmented thermoplastic poly(ether amides) and poly(ester amides) are obtained from the acid terminated monomers and diisocyanates by reaction polymerization processes. This reaction is best conducted in a vented extruder because carbon dioxide is the byproduct. 

The segmented polyamide elastomers are synthesized from MDI (4,4 -diisocyanato-diphenylmethane) and dicarboxylic acids and a carboxylic acid terminated aliphatic polyester, polycarbonate or polyether prepolymer with an average molecular weight of M = 500-5000. The dicarboxylic acids used as hard segment extenders are adipic and azelaic acid. Also, poly(ester amide) alloys are obtained using nylon-6,6 or polyesters (PEA/PBT). 

The synthesis and properties of poly(imide-siloxane) polymers and copolymers based on 5,5 bis(lyly3,3-tetramethyl-l,3-disiloxane-diyl)norbornane dicarboxylic anhydride are described. High-molec-ular-weight thermoplastics and elastoplastics were prepared readily in solution from aromatic diamines, organic dianhydrides, and this unique anhydride-terminated siloxane. The thermal and mechanical properties of a variety of copolymer compositions are described. Average siloxane block length and overall siloxane content had the greatest effect on these properties. 

CCT of benzyl methacrylate leads to a mixture of poly(benzyl methacrylate) macromonomers from which the dimer macromonomer could be isolated.516 When the benzyl dimer is used as a RAFT chain-transfer agent, PMMA with a- and co-terminal benzyl methacrylate units is obtained. Catalytic hydrogenation of the a,co-benzyl terminal methyl methacrylate polymer results in the evolution of toluene and formation of a,co-dicarboxyl functional telechelic PMMA. 

Aliphatic dicarboxylic acid dichlorides were applied to the surface-saponified blend of 50 wt% poly(ethylene-co-propene) and 50 wt% poly(ethylene-co-vinyl acetate) (PP/EVA). After coupling without cyclization, the second carboxylic acid group is available for the covalent binding of the protein via the W-terminal amino group [ 140]. The use of anhydrides, e.g. glutaric acid anhydride, is another possibility to introduce free carboxyl groups into the polymer surface. 

A group of acid-terminated unsaturated oligoesters having molecular weights of 500 to 1400 and incorporating a lactone as co-reactant with an aromatic, or partially or fully hydrogenated aromatic, dicarboxylic acid and an aliphatic diol are valuable plasticizers for poly(vinyl chloride) [56-59]. 

The thermoplastic PCL-related bioelastomers were prepared as shown in Scheme 8.10, which were poly(L-lactide)-PCL (PLLA-PCL) multiblock copolymers.The bischloroformates of carboxylated PLLA were first synthesized mainly by two steps, preparing PLLA diols initiated by 1,6-hexanediol with starmous octoate as catalyst at 130 °C for 5 h, and synthesizing acylhalide (COCl) group terminated PLLA at 60 °C for about 3 h from dicarboxylated PLLA which was prepared from PLLA diol and succinic anhydride. Then,... 

Poly(N-acylimino)ethylene/poly(ethylene oxide)/poly(Nacylimino) ethylene ABA block copolymers have been prepared from polyoxyethylene dicarboxylic acid (199). ABA block copolymers have also been prepared from poly(l-proline) and amino-terminated polyoxyethylene (200). 

Baigude, H. Katsuraya, K. Okuyama, K. Yachi, Y. Sato, S. Uryu, T. S3mthesis of dicarboxylate oligosaccharide multilayer terminal functionality upon poly(lysine) dendrimer scaffolding. J. Polymer Sci. Part A 2002, 40, 3622-3633. 

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