INTERPRETATION OF THE TRANS FRACTION AND FINE STRUCTURE OF MELT-QUENCHED POLY (ETHYLENE TEREPHTHALATE) Article Swipe

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YOU? · · 1981 · Open Access · · DOI: https://doi.org/10.2115/fiber.37.2_t59

In a preceding paper we determined the absolute trans fraction of CH2-CH2 bonds in melt-quenched poly (ethylene terephthalate) (PET) by means of infrared spectroscopy. The obtained fraction was an unexpectedly small value, 0.2, which is inconsistent with the probability of trans conformers, 0.3, averaged over all internal bonds of the unperturbed chain. From this fact and density consideration, we suggested that each chain in melt-quenched PET does not possess the random coil conformation but the folded chain conformation containing specially preferable conformers. In order to obtain the reasonable local conformation for the sequence CO-O-CH2-CH2-O-CO, we calculated the intramolecular potential energy. From this and a consideration of the intermolecular chain packing, the trans fraction of the ethylene glycol moiety and the fine structure of melt-quenched PET were discussed. In conclusion we suggest that the fine structure of meltquenched PET is very close to that in the crystals and is characterized as such that the crystallographic requirement between parallel folded chains is not satisfied owing to the irregular foldings.

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Conformational Isomerism

Infrared Spectroscopy

Concepts

Conformational isomerism Intramolecular force Intermolecular force Ethylene Materials science Moiety Crystallography Ethylene glycol Volume fraction Chain (unit) Spectroscopy Infrared spectroscopy Fraction (chemistry) Chemistry Molecule Stereochemistry Organic chemistry Physics Catalysis Composite material Quantum mechanics Astronomy

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Type: article
Language: en
Landing Page: https://doi.org/10.2115/fiber.37.2_t59
PDF: https://www.jstage.jst.go.jp/article/fiber1944/37/2/37_2_T59/_pdf
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DOI: https://doi.org/10.2115/fiber.37.2_t59

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Title: INTERPRETATION OF THE TRANS FRACTION AND FINE STRUCTURE OF MELT-QUENCHED POLY (ETHYLENE TEREPHTHALATE)

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Type: article

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Language: en

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Publication year: 1981

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Publication date: 1981-01-01

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Authors: Yuhiko Yamashita, Kazuo Monobe

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Landing page: https://doi.org/10.2115/fiber.37.2_t59

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Concepts: Conformational isomerism, Intramolecular force, Intermolecular force, Ethylene, Materials science, Moiety, Crystallography, Ethylene glycol, Volume fraction, Chain (unit), Spectroscopy, Infrared spectroscopy, Fraction (chemistry), Chemistry, Molecule, Stereochemistry, Organic chemistry, Physics, Catalysis, Composite material, Quantum mechanics, Astronomy

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abstract_inverted_index.unperturbed	50
abstract_inverted_index.conformation	72, 77, 89
abstract_inverted_index.inconsistent	35
abstract_inverted_index.meltquenched	136
abstract_inverted_index.unexpectedly	29
abstract_inverted_index.characterized	148
abstract_inverted_index.consideration	104
abstract_inverted_index.melt-quenched	14, 64, 123
abstract_inverted_index.spectroscopy.	23
abstract_inverted_index.consideration,	57
abstract_inverted_index.intermolecular	107
abstract_inverted_index.intramolecular	97
abstract_inverted_index.terephthalate)	17
abstract_inverted_index.crystallographic	153
abstract_inverted_index.CO-O-CH2-CH2-O-CO,	93
cited_by_percentile_year
countries_distinct_count	1
institutions_distinct_count	2
sustainable_development_goals[0].id	https://metadata.un.org/sdg/7
sustainable_development_goals[0].score	0.6499999761581421
sustainable_development_goals[0].display_name	Affordable and clean energy
citation_normalized_percentile.value	0.27540778
citation_normalized_percentile.is_in_top_1_percent	False
citation_normalized_percentile.is_in_top_10_percent	False