Reactions induced by triphenyl phosphite addition during melt mixing of poly(ethylene terephthalate)/poly(butylene terephthalate) blends: influence on polyester molecular structure and thermal behaviour

Synthesis of a deoxybenzoin derivative and its use as a flame retardant in poly(trimethylene terephthalate)

“…As shown in Table , the IV of the PTT–BDPP (95/5) blend was about 4% higher than that of the neat PTT resin at the same blending temperature; this might have been due to the stabilization effect of BDPP on the PTT resin during melt blending. Similar results have also been reported for other polyesters and polyester–polycarbonate alloys with phosphorus‐containing additives . As shown in Tables decreased about 5% when the processing temperature increased from 250 to 260 °C in both the neat PTT and PTT–BDPP (95/5); this demonstrated that the processing temperature was a critical factor affecting the molecular weight of the PTT and PTT blend.…”

“…Similar results have also been reported for other polyesters and polyester-polycarbonate alloys with phosphorus-containing additives. [22][23][24] As shown in Tables III and IV decreased about 5% when the processing temperature increased from 250 to 260 8C in both the neat PTT and PTT-BDPP (95/5); this demonstrated that the processing temperature was a critical factor affecting the molecular weight of the PTT and PTT blend. Table III indicate that the decrease in the melt viscosity in the PTT-BDPP (95/5) blend did not result from the degradation of the PTT resin but from the introduction of BDPP, which had a much lower viscosity than the PTT resin because of its low molecular weight.…”

Model Studies of Transreactions in Condensation Polymers

“…PET/PBT systems were used in the study of transreactions [15] because these polyesters are miscible in the melt. 13C FT-NMR [42] made it possible to determine sequence length distributions but some degradation was also observed.…”

Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

“…Triphenyl phosphite (TPPi), as a chain extender, has been used to increase the viscosity of poly(ethylene terephthalate) (PET) and poly(butylene terephthalate), whereas the chain structures of PET and poly(butylene terephthalate) could be maintained. 8,9 The reactive extrusion process is a very attractive approach for the preparation of high-molecular-weight PLLA. Jacobsen et al 10 studied the polymerization of lactide in a twin-screw extruder and obtained PLLA with a molecular weight of 100,000 after 7 min.…”