Mechanism and kinetics of transesterification in poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalene dicarboxylate) polymer blends

Medina, Rosa; Likhatchev, D.; Alexandrova, Larissa; Sanchez-Solis, A.; Manero, Ο.

doi:10.1016/j.polymer.2004.09.076

Cited by 16 publications

(16 citation statements)

References 11 publications

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“…Several authors have given attention to the kinetics of thistransesterification reaction describing it as a second order reversible reaction [Chen et al 1996, Lee et al, 1999, Alexandrova et al 2000. However, the equilibrium constant was considered in those works as equal to one, which presumes that the reaction of equimolar amounts of thereactants leads to equal concentrations of molar fractions of the species when the transesterification reaction reaches equilibrium.…”

Section: Wwwintechopencommentioning

confidence: 99%

“…However, the equilibrium constant was considered in those works as equal to one, which presumes that the reaction of equimolar amounts of thereactants leads to equal concentrations of molar fractions of the species when the transesterification reaction reaches equilibrium. Based on the results above mentioned, the mechanism and kinetics of the transesterification reaction in poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalene dicarboxylate) polymer blends was simulated using model compounds of ethylenedibenzoate (BEB) and ethylene dinaphthoate (NEN) [Alexandrova et al 2000]. An additional investigation dealt with the actual melt extrusion of the blend below the critical reaction temperature in the extruder [Medina et al 2004] Prior to melt compounding in the extruder, the PET and PEN polymers were previously dried in a Cole-Palmer vacuum oven at 120 °C with-45mm Hg pressure during 10 h. Extrusion was carried out in a Haake-Rheocord 90 TW-100 twin-screw conical counter-rotating extruder of 331 mm length, with temperature profile of 230, 240 and 250 °C and screw speed of 30RPM.…”

Section: Wwwintechopencommentioning

confidence: 99%

“…Alexandrova, L., Cabrera, A., Hernández, M.A., Cruz, M.J, Abadie, M.J.M., Manero, O., Likhatchev, D.,(2000). Mechanism and kinetics of transesterification in …”

Section: Referencesmentioning

confidence: 99%

See 2 more Smart Citations

PET-MMT and PET-PEN-MMT Nanocomposites by Melt Extrusion

Calderas¹,

Sánchez-Olivares²,

Herrera‐Valencia³

et al. 2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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Section: Wwwintechopencommentioning

confidence: 99%

Section: Wwwintechopencommentioning

confidence: 99%

See 1 more Smart Citation

PET-MMT and PET-PEN-MMT Nanocomposites by Melt Extrusion

Calderas¹,

Sánchez-Olivares²,

Herrera‐Valencia³

et al. 2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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“…In this state, there is a simple relation between the forward and backward rate constants which simplifies the situation. [13] However, assuming an equilibrium state under the melt mixing processing conditions is far from reality. Therefore, in this work, an attempt has been made to solve the above equation from the first stage of mixing till it reaches to the equilibrium state.…”

Section: Mathematical Approach For Calculation Of the X And Rdmentioning

confidence: 99%

An Improved Non‐Isothermal Kinetic Model for Prediction of Extent of Transesterification Reaction and Degree of Randomness in PET/PEN Blends

Golriz

Khonakdar

Jafari

et al. 2008

Macro Theory & Simulations

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An improved non‐isothermal kinetic model was developed based on mass balance and Arrhenius laws using a second‐order reversible reaction capable of predicting the extent of transesterification reaction (X) and the degree of randomness (RD) in poly(ethylene terephthalate) (PET)/poly(ethylene naphthalene‐2,6‐dicarboxylate) (PEN) blends prepared by a twin screw micro‐compounder over a full composition range under different processing conditions. The experimental values of X and RD were determined by 1H‐NMR and a direct relationship between them developed. The model constants were tuned by an optimization method using half of the experimental data, with the other half used for verification. Good agreement was found between the experimental and theoretical data in the verification stage and, therefore, it was concluded that the model is capable of predicting the extent of transesterification reaction with a high level of confidence for a wide range of processing conditions. Similarly to the experimental results, the model showed that, among all parameters affecting the extent of transesterification reaction, the time and temperature play the major role, whereas the blend composition does not have a significant role.magnified image

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“…By controlling the extent of the interchange reactions, tailored block and random copolyesters can be formed with desirable properties. Several examples of transesterification reactions in polyester blends have been reported in literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

Canetti

Castellano

2012

J Polym Res

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Wide-Angle X-ray Diffraction (WAXD) and Small-Angle X-ray Scattering analyses were carried out to evaluate the evolution of the crystalline and supermolecular structure of poly(ethylene terephthalate) (PET) blended with poly(trimethylene terephthalate) (PTT). The conditions adopted in preparing the PET/PTT 50/50 blend induce transesterification between the polyesters; these reactions produce a new molecular characteristics based on PET/PTT copolymer that exhibits its own WAXD profile. The PET/ PTT 50/50 copolymers prepared by melt mixing of the homopolymers for increasing times evidence spherulitic morphology and an evolution of the crystalline structure in terms of crystallinity and crystal dimensions. The periodicity of the transesterificated samples is intermediate between the long periods observed for pure PET and pure PTT. For the PET/PTT 50/50 copolymers the value of periodicity and lamellar thickness increase with the increasing of the processing time.

show abstract

Mechanism and kinetics of transesterification in poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalene dicarboxylate) polymer blends

Cited by 16 publications

References 11 publications

PET-MMT and PET-PEN-MMT Nanocomposites by Melt Extrusion

PET-MMT and PET-PEN-MMT Nanocomposites by Melt Extrusion

An Improved Non‐Isothermal Kinetic Model for Prediction of Extent of Transesterification Reaction and Degree of Randomness in PET/PEN Blends

Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

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