α‐Hydroxy and α‐chloroformyl oligomers of poly(butylene terephthalate) (PBT) were prepared in 1,1,2,2‐tetrachloroethane by condensing terephthaloyl chloride and 1,4‐butanediol and using benzoyl chloride and 4‐hydroxybutyl benzoate as chain limitator. The average molecular weight was determined by 1H NMR analysis, and thermal properties were assessed by differential scanning calorimetry (DSC). Preparation of α‐thiol oligomers of PBT was also investigated by esterification of α‐hydroxy oligomers with thioglycolic acid and using p‐toluenesulfonic acid as catalyst. The DSC and TGA analyses pointed out that the introduction of a thiol group by esterification has no influence on the thermal properties of the PBT oligomers.

The synthesis of a new block copolymer was investigated by the condensation of terephthaloyl chloride, hydrogenated α,ω‐dihydroxy polybutadiene and butanediol. The resulting (PBT) product is termed as the hard segment, and the hydrogenated α,ω‐dihydroxy poly‐butadiene is termed as the corresponding soft segment. This block copolymer was characterized by FTIR, 1H and 13C‐NMR, DSC, and SEC. Quantitative estimations of the contents of block segments have been carried out by NMR. The product was used either to increase the properties of PBT/PP blends or the impact strength of PBT. In both cases the mechanical properties are described. © 1995 John Wiley & Sons, Inc.

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The synthesis of aromatic telechelic monodisperse diols produced from the radical-initiated addition reation of a two-fold excess of 10-undecen-1-01 and new qwdithiols is presented. The dithiols were prepared by esterification of thioglycolic acid with monodisperse telechelic diols obtained by fractionation of oligo(ethy1ene terephthalate)s and oligo(tetramethy1ene terephthalate)s. In all the cases, the long-chain a,odiols were produced selectively and quantitatively. The diols are soluble in most organic solvents, contrary to classical oligo(ethy1ene terephtha1ate)s and oligo(tetramethy1ene terephtha1ate)s.

Oligomers with poly(buty1ene terephthalate) (PBT) containing organosilane extremities were prepared by reacting an a-allylic oligomer of PBT with silanethiols or with silanes. The a-allylic oligomer of PBT was synthesized by condensation of ally1 alcohol, 1,4-butanediol and terephthaloyl dichloride. All the oligomers were characterized by means of proton nuclear magnetic resonance, Fourier-transform infrared spectroscopy, size-exclusion chromatography, gas chromatography and high-performance liquid chromatography. Their thermal properties were also investigated.