A Possible Means to Assist the Processing of PET, PTT and PBT

Alessi, Matteo; Conzatti, Lucia; Hodge, Philip; Scafati, Santolo Taglialatela; Stagnaro, Paola

doi:10.1002/mame.200900307

Cited by 12 publications

(23 citation statements)

References 13 publications

(19 reference statements)

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“…18,23,24 However, due to the limited availability of cyclic derivatives, only a few semi-aromatic polyesters have been synthesized to date by ring opening polymerizations. Extraction 17 and cyclo-depolymerization 18,[24][25][26] result in the formation of cyclic derivatives. Nevertheless, these procedures also imply the use of solvents and catalysts which result in additional cost and toxicity issues.…”

Section: Introductionmentioning

confidence: 99%

Single‐step solution polymerization of poly(alkylene terephthalate)s: synthesis parameters and polymer characterization

Giol

Brande

Mele

et al. 2018

Polymer International

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Poly(alkylene terephthalate)s represent one of the most frequently used polymer classes worldwide. Well‐known examples include poly(ethylene terephthalate) (n = 2) and poly(butylene terephthalate) (n = 4). The conventional synthesis method for these polymers is based on melt polycondensation, a two‐stage process performed under harsh conditions that includes the synthesis of an intermediate prepolymer and the presence of a catalyst, which may induce toxicity issues. The present work reports on a straightforward single‐step solution polycondensation method performed under mild conditions and in the absence of a catalyst. A homologous series of poly(alkylene terephthalate)s (n = 5 − 10) of molar masses up to 20 000 g mol−1 and dispersity <2.4 was synthesized and characterized thoroughly. Great attention was given to the thermal properties assessment by using state‐of‐the‐art techniques and a highly sensitive prototype technique called rapid heat − cool DSC. Similar to melt‐synthesized polyesters, a particular odd − even trend of the thermal properties versus the number of methylene groups within the monomer unit was revealed. To the best of our knowledge, this is the first report covering a single‐step solution‐based polycondensation performed in the absence of a catalyst that results in highly reproducible polyesters possessing unaltered thermal properties compared to polyesters synthesized through industrially applied conventional routes. © 2017 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Single‐step solution polymerization of poly(alkylene terephthalate)s: synthesis parameters and polymer characterization

Giol

Brande

Mele

et al. 2018

Polymer International

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“…Analytical scale size exclusion chromatography (SEC) analyses were carried out using a Perkin‐Elmer chromatograph (Diode Array Detector 235C) operating at a flow rate of 1 mL/min. A good separation of MCO mixtures was obtained using tetrahydrofuran as the eluant 23, 24. As the polyesters studied are poorly soluble in common solvents, they were introduced onto the column and then eluted with a mixture of CHCl 3 /CH 2 Cl 2 /HFIP (60/30/10 v/v/v) 23.…”

Section: Methodsmentioning

confidence: 99%

“…A good separation of MCO mixtures was obtained using tetrahydrofuran as the eluant 23, 24. As the polyesters studied are poorly soluble in common solvents, they were introduced onto the column and then eluted with a mixture of CHCl 3 /CH 2 Cl 2 /HFIP (60/30/10 v/v/v) 23. In both cases, a 10 5 (μ‐Styragel HR5, 30 cm, 15 μm), 10 4 , 10 3 , 500 Å (PL GEL, 30 cm, 5 μm) column set was used, and it was calibrated using polystyrene standards.…”

Section: Methodsmentioning

confidence: 99%

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Syntheses of random PET‐co‐PTTs and some related copolyesters by entropically‐driven ring‐opening polymerizations and by melt blending: Thermal properties and crystallinity

Conzatti¹,

Alessi²,

Stagnaro³

et al. 2011

J. Polym. Sci. A Polym. Chem.

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A library of random poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate) (PTT), and seven PET-PTT copolymers has been prepared in a high throughput manner by entropically-driven ring-opening polymerizations of the corresponding macrocyclic oligomers. The products have been investigated by differential scanning calorimetry and wide angle X-ray diffraction. They show that the 50:50 copolymer displays a crystalline phase. The same phase can be formed by in situ transesterification when a 50:50 mixture of PET and PTT is melt blended. Poly(butylene terephthalate) (PBT)-PET and PTT-PBT 50:50 copolymers also show crystal phases. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [995][996][997][998][999][1000][1001][1002][1003][1004][1005] 2011 An alternative synthetic approach to copolyesters is entropically-driven ring-opening polymerization (ED-ROP). [18][19][20] This involves the ring-opening polymerization of macrocycles at high concentrations. Recently, we have developed a novel method for the high throughput (HTP) synthesis of libraries of polyesters. 21

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“…(1-column fitting image) ED-ROP can be considered as a green process because to push the equilibrium towards the linear polymer generally no solvent is required, and, since the starting MCOs have no end groups and are strainless, no small molecules are released and little or no heat is evolved. Furthermore, highmolecular-weight polymers can be prepared in relatively short reaction times under atmospheric pressure, and the lower melt viscosity of the MCOs with respect to the polymer being formed allows easier processing by various techniques, such as pultrusion, resin-transfer moulding, reaction injection moulding, either concurrent with or just prior to polymerization [5][6][7]. ED-ROP has potential application in the preparation of composite materials [3], as voids due to the release of small volatile compounds are not created in the final products and the control of temperature throughout the reaction course is relatively facile.…”

Section: Introductionmentioning

confidence: 99%

Macrocyclic oligomers as compatibilizing agent for hemp fibres/biodegradable polyester eco-composites

Conzatti

Brunengo

Utzeri

et al. 2018

Polymer

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Ring:chain equilibria (RCE), existing under appropriate reaction conditions, between a linear polyester and the corresponding family of macrocyclic oligomers (MCOs), were exploited to develop an original compatibilizing pathway for preparing eco-composites based on hemp fibres and a biodegradable random co-polyester, namely poly(1,4-butylene adipate-co-terephthalate) (PBAT) with 50:50 adipate:therephthalate proportion. Cyclo-depolymerization (CDP) of PBAT was successfully carried out at high dilution using various solvents, catalysts, and reaction times. The reconversion of MCOs into linear chains by entropically-driven ring-opening polymerization (ED-ROP) occurs by simple heating in the bulk. This reaction, after optimization of catalyst amount, temperature, and reaction time, was used for the surface modification of hemp fibres. PBAT-based eco-composites containing hemp fibres as such or pre-modified by treatment with the MCOs were then prepared and characterized by morphological and mechanical analysis.

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A Possible Means to Assist the Processing of PET, PTT and PBT

Cited by 12 publications

References 13 publications

Single‐step solution polymerization of poly(alkylene terephthalate)s: synthesis parameters and polymer characterization

Single‐step solution polymerization of poly(alkylene terephthalate)s: synthesis parameters and polymer characterization

Syntheses of random PET‐co‐PTTs and some related copolyesters by entropically‐driven ring‐opening polymerizations and by melt blending: Thermal properties and crystallinity

Macrocyclic oligomers as compatibilizing agent for hemp fibres/biodegradable polyester eco-composites

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