Neue Erkenntnisse in der Chemie des Terylene und verwandter Polyester

Goodman, I.

doi:10.1002/ange.19620741603

Cited by 38 publications

(21 citation statements)

References 18 publications

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“…Thus, the polymers from the odd series (PPntT, PHepT and PNT) exhibited overall lower T m values compared with their even counterparts (PHT, POT and PDT). Similar trends were previously reported for poly(alkylene terephthalate)s synthesized via melt polycondensation …”

Section: Resultssupporting

confidence: 89%

“…Similar trends were previously reported for poly(alkylene terephthalate)s synthesized via melt polycondensation. 43,44 An odd − even trend regarding the peak shape of T m was also recorded. The odd polyester series presented only one melting peak in the DSC trace (PPntT after a cold crystallization), while the even series presented two melting peaks during the heating cycle (denoted T m1 and T m2 ) and a sharp crystallization peak during the cooling cycle (T c ).…”

Section: Glass Transition and Melting Temperature Assessment By Dsc Amentioning

confidence: 83%

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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: Resultssupporting

confidence: 89%

Section: Glass Transition and Melting Temperature Assessment By Dsc Amentioning

confidence: 83%

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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Section: Introductionmentioning

confidence: 99%

“…Although poly(octamethylene terephthalate) (POT) as a member of PAT is also expected to be one of promising semicrystalline polymeric materials for various applications, its fundamental studies on crystalline structures, thermal, and mechanical properties have been investigated limitedly 30–32. It was just reported by Goodman that the c ‐axis length of POT crystal structure is 18.1 Å, without detailed crystalline structural analysis 30. For systematic understanding of the structure‐property relationship of POT, in this study, we synthesized a POT sample with high molecular weight via the direct melt‐polycondensation reaction and first investigated the crystal structure of POT by using X‐ray diffraction, molecular modeling and mechanics.…”

Section: Introductionmentioning

confidence: 99%

Characterizing flexible and intrinsically unstructured biological macromolecules by SAS using the Porod‐Debye law

2011

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Unstructured proteins, RNA or DNA components provide functionally important flexibility that is key to many macromolecular assemblies throughout cell biology. As objective, quantitative experimental measures of flexibility and disorder in solution are limited, small angle scattering (SAS), and in particular small angle X-ray scattering (SAXS), provides a critical technology to assess macromolecular flexibility as well as shape and assembly. Here, we consider the Porod-Debye law as a powerful tool for detecting biopolymer flexibility in SAS experiments. We show that the Porod-Debye region fundamentally describes the nature of the scattering intensity decay, which captures information needed for distinguishing between folded and flexible particles. Particularly for comparative SAS experiments, application of the law, as described here, can distinguish between discrete conformational changes and localized flexibility relevant to molecular recognition and interaction networks. This approach aids insightful analyses of fully and partly flexible macromolecules that is more robust and conclusive than traditional Kratky analyses. Furthermore, we demonstrate for prototypic SAXS data that the ability to calculate particle density by the Porod-Debye criteria, as shown here, provides an objective quality assurance parameter that may prove of general use for SAXS modeling and validation.

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“…[8][9][10] The crystal structures and the structure transformations occurring under mechanical deformation between two forms (a, b) in PBT and PPT have been widely investigated. [4,[13][14][15][16] In particular, the polymer chain normally Summary: The polymorphisms in poly(hexamethylene terephthalate) (PHT), along with their associated melting and spherulite morphologies, were examined by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and polarized-light microscopy (PLM). The morphology and crystal cells were dependent on the temperature of crystallization.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Polymorphism and Dual Crystalline Morphologies in Poly(hexamethylene terephthalate)

Woo

Chiang

et al. 2004

Macromol. Rapid Commun.

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Summary: The polymorphisms in poly(hexamethylene terephthalate) (PHT), along with their associated melting and spherulite morphologies, were examined by differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), and polarized‐light microscopy (PLM). The morphology and crystal cells were dependent on the temperature of crystallization. When melt‐crystallized at low temperatures (90–135 °C), PHT showed at least five melting peaks and two re‐crystallization peaks upon DSC scanning, and the samples displayed various fractions of both α and β crystals. However, only a single melting peak was obtained in PHT melt‐crystallized at 140 °C or above, which displayed a single type of β crystal. In addition, two different forms of spherulites were identified in melt‐crystallized PHT, with one being a typical Maltese‐cross spherulite containing the α crystal, and the other being a dendrite‐type packed mainly with the β crystal. This study provides timely evidence for a critical interpretation of the relationship between multiple melting and polymorphisms (unit cells and spherulites) in polymers, including semi‐crystalline polyesters.

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Neue Erkenntnisse in der Chemie des Terylene und verwandter Polyester

Cited by 38 publications

References 18 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

Characterizing flexible and intrinsically unstructured biological macromolecules by SAS using the Porod‐Debye law

Analysis of Polymorphism and Dual Crystalline Morphologies in Poly(hexamethylene terephthalate)

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