Formation of poly(butylene terephthalate): growing reactions studied by model molecules

Pilati, Francesco; Manaresi, P.; Fortunato, Bruno; Munari, Andrea; Passalacqua, V.

doi:10.1016/0032-3861(81)90018-5

Cited by 48 publications

(23 citation statements)

References 6 publications

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“…This is usually assigned to the formation of catalyst dimers or oligomers. 277,280,281 The catalytic activity of metal acetates has been examined with respect to their acidity factor β, which corresponds to the stability constant of dibenzoylmethane complex for the considered metal species. 282 The results indicate that very strong or very weak carbonyl-metal interactions are unfavorable factors with regard to catalytic activity.…”

Section: Reaction Mechanisms and Catalysismentioning

confidence: 99%

Polyesters

Fradet

Tessier

2003

Synthetic Methods in Step‐Growth Polymers

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Section: Reaction Mechanisms and Catalysismentioning

confidence: 99%

Polyesters

Fradet

Tessier

2003

Synthetic Methods in Step‐Growth Polymers

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“…This variation agreed well with that of the esterification ratio depicted in Figure 3, confirming that esterification reaction was the key step to determine the molecular weights of the prepared products. 21 The polycondensation reaction mechanism of PBST was similar to that of poly(butylene terephthalate) (PBT) reported by Pilati et al 22 It was generally described in terms of coordination of the transition metal to the carbonyl group, or alternatively of basis catalysis. That is to say, the complex reaction was determined to be dominant in the polycondensation reaction.…”

Section: Influence Of Catalyst On the Synthesismentioning

confidence: 88%

Synthesis of poly(butylene succinate‐co‐butylene terephthalate) (PBST) copolyesters with high molecular weights via direct esterification and polycondensation

Luo

et al. 2009

J of Applied Polymer Sci

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In this article, biodegradable poly(butylene succinate-co-butylene terephthalate) (PBST) copolyesters with high molecular weights were synthesized by direct esterification and polycondensation route. The reaction conditions and catalytic systems were investigated in detail. Through balancing the reaction efficiency and the costs of reactants, the proper molar ratio of diol to diacid was determined. Titanium tetraisopropoxide (TTiPO) was found to be an effective catalyst both in esterification and polycondensation reaction, and its content was optimized based on the esterification ratio and amount of formed by-products. The complex reaction was determined to be the dominant catalytic reaction mechanism. By importing the additives of metal oxides coupled with TTiPO, the weight-average molecular weights of PBST increased sharply from 8.51 Â 10 4 to 14.38 Â 10 4 , manifesting the additives promoted the polymerization reaction greatly. The enhancement of carbonyl polarization and provision of suitable reaction space arose from the metal oxides were the reasons for promoting the polymerization reaction. With respect to thermal properties, the same melting point and heat of fusion were found, while thermal stability increased with the import of additives. The result was prone to be interpreted by the higher molecular weights of PBST in the presence of additives.

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“…The ac- Figure 2 Accumulative THF amount vs. reaction time curves in the presence of various salts. (1) Sodium phosphate, ( 2 ) Sodium citrate, ( 3 ) Potassium terephthalate, ( 4 ) Sodium carbonate, (5) Blank.…”

Section: Resultsmentioning

confidence: 99%