New catalysts for poly(butylene terephthalate) synthesis. 2. Kinetic comparison using model compounds

Poly(ethylene terephthalate), modified with bisphenol S units, with increased glass transition temperature

“…The degree of randomness obtained for the polymer with 30% of BHEBS units was 0.92 and therefore, analogously to what observed for PBT‐ co ‐BHEBST copolymers,23 the structure of the copolymers can be considered random. This was also expected as the reaction was conducted for a reaction time comprised between 75 and 165 minutes at high temperature (275°C) with a catalyst (TBT) that is well known26 to promote the exchange reactions that give rise to copolymer randomization.…”

Telechelic polyesters of ethane diol and adipic or sebacic acid by means of bismuth carboxylates as non-toxic catalysts

“…This approach was also used for many decades for the technical syntheses of poly(ethylene terephthalate) and poly(butylene terephthalate). The most efficient and most widely used catalyst for this type of polycondensation is titaniumtetrabutoxide (or other tetraalkoxides) alone or in combination with additives [3][4][5][6][7]. For temperatures below 200 8C, tin(II) salts and tin(II) alkoxides have proven to be excellent transesterification catalysts particularly useful for ring-opening polymerizations of lactones and lactides [8][9][10].…”

One-pot melt synthesis of resorcinol based polyarylates for UV-stable coatings

“…Titanium butoxide was chosen as catalyst since it is active in trans-esterification and esterification reactions [31][32][33]. The second model reaction was conducted reacting DPC with resorcinol in the presence of titanium butoxide (Fig.…”