On specific factors affecting the crystallization of PET: the role of carboxyl terminal groups and residual catalysts on the crystallization rate

Pilati, Francesco; Toselli, Maurizio; Messori, Massimo; Manzoni, Celestina; Turturro, Antonio; Gattiglia, E.

doi:10.1016/s0032-3861(96)01046-4

Cited by 49 publications

(44 citation statements)

References 52 publications

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“…Carboxyl terminal group content ([COOH]) was measured by titration, according to the methods reported in literatures [37,38]. In a nitrogen atmosphere, a sample of about 0.3 g of nanocomposites was dissolved in 10 ml of benzyl alcohol under heating and titrated with 0.01 N KOH-EG solution with phenol red as an indicator.…”

Section: Determination Of Molecular Weightmentioning

confidence: 99%

Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension

Ding

Qian

et al. 2009

Polymer Degradation and Stability

140

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Section: Determination Of Molecular Weightmentioning

confidence: 99%

Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension

Ding

Qian

et al. 2009

Polymer Degradation and Stability

140

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“…The presence of metal was reported to affect the thermal properties [19] and the degradation behaviour [4] of PET, as it is reported to be involved in thermal degradation pathways. In fact the metal complexation to the adjacent carbonyl group can affect the electronic distribution at the carbon involved in the electrocyclic hydrogen transfer of thermal degradation [20] thus favouring chain scission.…”

Section: Introductionmentioning

confidence: 99%

Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Coltelli

Bianchi

Aglietto

2007

Polymer

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“…Nevertheless, the catalysts may have some influence on the crystal structure and crystallization behavior. [14][15][16][17][18] Study on the effect of catalyst on the crystallization behavior of PTT has not yet been investigated until recently.…”

Section: Introductionmentioning

confidence: 99%

Non‐Isothermal Crystallization Behavior of Poly(trimethylene terephthalate) Synthesized with Different Catalysts

Chen

Tang

Shen

et al. 2004

Macro Materials & Eng

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Summary: Non‐isothermal crystallization behavior of PTT resins synthesized with different catalysts was studied by using differential scanning calorimetry (DSC) and polarized light microscopy (PLM). The results showed that with the increase of the cooling rate, the crystallization temperature for poly(trimethylene terephthalate) (PTT) resin decreased, which indicated that the crystallization process was controlled by the nucleation. Catalyst had no effect on the crystallization development process, but had somewhat effect on the non‐isothermal crystallization mechanism. The average values of Avrami exponent, for PTT with different catalysts were between 3 and 4. It was assumed that the non‐isothermal crystallization mechanism for PTT with or without catalyst was the combination of homogenous and heterogeneous nucleation and spherulite growth, but it mainly depended on the latter. For sample 4, the non‐isothermal crystallization underwent secondary crystallization process when cooling rate was over 20 °C/min. At the same cooling rate, the crystallization temperature, the crystallization ability and the crystallization rate of PTT resins followed the sequence as: sample 2 > sample 1 ≈ sample 3 ≈ sample 4, which proved that catalysts could significantly prompt crystallization. The cooling rate had significant effect on the crystallization ability parameters of PTT, i.e., with the increase of cooling rate, the crystallization ability declined. Although catalyst could increase the crystallization ability of PTT, the effect was very limited because the effect of the molecular weight on the crystallization ability would be superior to the catalyst when the molecular weight of PTT was significantly high. The specific surface area of catalyst had also a great influence on the spherulitic morphology of PTT formed in the cooling process. The spherulite dimensions decrease with increasing the specific surface area of catalyst because of an increase in the nucleation rate, which produces more and smaller spherulites that can not grow larger before impinging on each other. magnified image

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On specific factors affecting the crystallization of PET: the role of carboxyl terminal groups and residual catalysts on the crystallization rate

Cited by 49 publications

References 52 publications

Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension

Degradation of poly(ethylene terephthalate)/clay nanocomposites during melt extrusion: Effect of clay catalysis and chain extension

Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Non‐Isothermal Crystallization Behavior of Poly(trimethylene terephthalate) Synthesized with Different Catalysts

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