Abstract A simple chain‐extension reaction using diisocyanate as a chain extender was adopted to increase the molecular weight of low‐molecular‐weight (LMW) poly(lactic acid) (PLA) synthesized via direct polycondensation and recover commercial PLA after service life. The slow between carboxylic acid terminus successfully accelerated Mg(II) catalyst, affording linear chain‐extended (cePLA) conne...

Oxidative polycondensation of 3,4-ethylenedioxythiophene and (-)-myrtenal was carried out with POCl₃. A p-conjugated system thus constructed consists of aromatic and quinoidal alternating structure linked via methine groups. We examined iodine doping effect for the resultant material with electron spin resonance spectroscopy. Circular dichroism spectra in chloroform solution showed blue-shift w...

Novel poly(arylene ethynylene)s comprising a cinnoline core were prepared in high yields via a three-step methodology. A Richter-type cyclization of 2-ethynyl- and 2-(buta-1,3-diynyl)aryltriazenes was used for cinnoline ring formation, followed by a Sonogashira coupling for the introduction of trimethylsilylethynyl moieties and a sila-Sonogashira coupling as the polycondensation technique. The ...

A new series of copolyester chalcone derivatives were synthesised from 1, 3-bis (4-hydroxy-3methoxyphenyl) propenone (BHMPP) and 1(3, 5-dihydroxyphenyl)-3-(4-methoxyphenyl) propenone (DHPMPP) with adipoyl, suberoyl, azeloyl and sebacoyl chlorides by phase transfer catalysed polycondensation method. The microstructure of the repeating unit was confirmed by IR, 1 H and 13 C NMR. These copolyester...

Thirteen polyamides were synthesized by polycondensation using phosphorylation, low temperature solution and interfacial solution methods from 2, 2’-Dichloro-4, 4’-diaminoazobenzene condensed with different aliphatic diacids. These were characterised by inherent viscosity, solubility and spectral studies like UV-visible and IR. Moisture regain and dyeing properties have also been studied. TGA a...