Cyclische ester in poly(alkylenterephthalaten)

Burzin, Klaus; Holtrup, Wolfgang; Feinauer, Roland

doi:10.1002/apmc.1978.050740107

Cited by 18 publications

(4 citation statements)

References 12 publications

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“…Terephthalic acid and several of its esters have been isolated from plants . Pharacine ( 5 ) is the first cyclic terephthalic acid ester from a natural source; however, it has already been described as a cyclization product from terephthaloyl chloride and butanediol or as trace components of poly(1,4-butylene terephthalate) . To the best of our knowledge, NMR data have not been published; however, our mass spectra were nearly identical with those in the literature .…”

Section: Resultssupporting

confidence: 69%

Pharacine, a Natural p-Cyclophane and Other Indole Derivatives from Cytophaga sp. Strain AM13.1

et al. 2002

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From the ethyl acetate extract of the bacterial strain Cytophaga sp. AM13.1, among many known compounds, the new natural products 2,5-bis(3-indolylmethyl)pyrazine (2) and a highly symmetrical p-cyclophane named pharacine (5) were identified. In addition, tryptamine isovalerate (1) and p-hydroxyphenylacetamide (4), known as plant metabolites, were isolated and characterized from a microorganism for the first time. The new natural products showed no activity against three microalgae, the fungus Mucor miehei, the yeast Candida albicans, and the bacteria Staphylococcus aureus, Bacillussubtilis, Escherichia coli, and Streptomyces viridochromogenes.

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Section: Resultssupporting

confidence: 69%

Pharacine, a Natural p-Cyclophane and Other Indole Derivatives from Cytophaga sp. Strain AM13.1

et al. 2002

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“…These peaks are attributed to cyclic dimer, cyclic trimer, and cyclic tetramer of PET oligomer, respectively. As for the thermal oligomation of PET, Burzin et al 13 and Cooper and Semlyen 14 extracted the produced cyclic oligomer and analyzed them by gel permeation chromatography. Walker and Semlyen 15 calculated the produced quantity of the cyclic oligomer by the Jacob- of high molecular weights of 230 and 345 amu, respectively.…”

Section: Discussionmentioning

confidence: 99%

Laser ablation of poly(ethylene terephthalate)

Watanabe

Yamamoto

1997

J. Appl. Polym. Sci.

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Laser ablation of a poly(ethylene terephthalate) (PET) film with an excimer laser beam, 248 nm, was analyzed by various analysis methods, and the mechanism was studied. The ablation was carried out in an argon gas atmosphere at room temperature. Produced gases and some fragments were collected and analyzed by GC-MS. The photochemical fragmentation of PET through the Norrish type I reaction was dominant, but above the threshold fluence, ca. 30 mJ/cm 2 , thermal reactions such as cyclic oligomerization occurred and photochemical fragmentation was accelerated by the thermal energy.

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“…50 und Poly(1 ,4-dimethylencyclohexanterephthalat)51~ 52 wurden bereits einige Oligomerenklassen praparativ bearbeitet. Bei Poly(propylenterephtha1at) 54 und Poly(butylenterephtha1at) 9 9 54 liegen auch Arbeiten uber die Konzentrationsverteilung der cyclischen Oligomeren vor. Beim Poly( 1 ,Cdimethylencyclohexanterephthalat) 51, 9 und beim Poly(hexylenterephtha1at) 55 wurden nur Extraktbestimmungen durchgefuhrt.…”

Section: Einleitung Und Problemstellungunclassified

Cyclische oligomere in polyestern aus diolen und aromatischen dicarbonsäuren

Wick¹,

Zeitler²

1983

Angew. Makromol. Chem.

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Herrn Prof. Dr. K. Weissermel zum 60. Geburtstag gewidmet ZUSAMMENFASSUNG:In einer Reihe von Polyestern aus Diolen und aromatischen Dicarbonsauren wurden die cyclischen Oligomeren isoliert und mit Hilfe der Hochdruckflussigkeitschromatographie quantitativ bestimmt.Der Gehalt an cyclischen Oligomeren hangt von der chemischen Struktur der Polyester und vom Kondensationsverfahren ab. Hauptkomponente ist das cyclische Dimere, bei Poly(ethylenterephthalat), Poly(l,4dimethylencyclohexanterephthalat) und Poly(l,4-dimethylenbenzolterephthalat) aus Ringspannungsgriinden das cyclische Trimere.Bei technischem Poly(1 &dimethylencyclohexanterephthalat) gelang eine Auftrennung der stereoisomeren cyclischen Oligomeren, die durch die Verwendung eines trans/cis-l,4-Cyclohexandimethanol-Gemisches entstehen.Die cyclischen Oligomeren der Copolyester mit Diolethern enthalten bei niedrigem Modifizierungsgrad nur einen Dioletherrest. SUMMARY:Cyclic oligomers have been separated and determined quantitatively by high pressure liquid chromatography on a number of polyesters of the diol-aromatic dicarbonk acid-type.Percentage of cyclic oligomers is related to the chemical structure of the polyesters as well as to the technology of polycondensations. Main component proved to be the cyclic dimer except in case of poly(ethyleneterephthalate), poly(1 ,Cdimethylenecyclohexaneterephthalate) and poly(l,4dimethylenebenzeneterephthalate). Heredue to reasons of ring tensioncyclic trimers are predominant.Separation of stereoisomer cyclic oligomers, resulting from use of a trans/cis-l,4 cyclohexanedimethanol blend, could be achieved. Cyclic oligomers of copolyesters with diolethers, if modified to a low degree, only have one diolether group. 0 1983 Htithig & Wepf Verlag, Base1 0003-3146/83/%03.00/0

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Cyclische ester in poly(alkylenterephthalaten)

Cited by 18 publications

References 12 publications

Pharacine, a Natural p-Cyclophane and Other Indole Derivatives from Cytophaga sp. Strain AM13.1

Pharacine, a Natural p-Cyclophane and Other Indole Derivatives from Cytophaga sp. Strain AM13.1

Laser ablation of poly(ethylene terephthalate)

Cyclische oligomere in polyestern aus diolen und aromatischen dicarbonsäuren

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