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Volumn 280, Issue 5364, 1998, Pages 714-717

Elucidation of the chain conformation in a glassy polyester, PET, by two-dimensional NMR

Author keywords

[No Author keywords available]

Indexed keywords

POLYETHYLENE TEREPHTHALATE;

EID: 0032076265     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5364.714     Document Type: Article
Times cited : (121)

References (44)
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    • Trans is also known as (fully staggered) anti or antiperiplanar, and gauche is also known as synclinal. The trans conformation of PET is shown in Fig. 1
    • Trans is also known as (fully staggered) anti or antiperiplanar, and gauche is also known as synclinal. The trans conformation of PET is shown in Fig. 1.
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    • The 2D spectra were rotated by 90° from the traditional representation to simplify the comparison of the intensity patterns along the double-quantum dimension
    • The 2D spectra were rotated by 90° from the traditional representation to simplify the comparison of the intensity patterns along the double-quantum dimension.
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    • note
    • 1 components yielded 3 ± 2.5% crystallinity.
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    • The trans fraction of the amorphous phase was obtained as (18.5% - 5%)/0.95 = 14%
    • The trans fraction of the amorphous phase was obtained as (18.5% - 5%)/0.95 = 14%.
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    • The sample obtained by crystallizing the amorphous PET at 160°C for 2 hours had a crystallinity of 32 ± 4% by thermal analysis and 28 ± 4% by CP-MAS NMR. WAXS showed strong crystalline reflections
    • The sample obtained by crystallizing the amorphous PET at 160°C for 2 hours had a crystallinity of 32 ± 4% by thermal analysis and 28 ± 4% by CP-MAS NMR. WAXS showed strong crystalline reflections.
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    • note
    • 13C spectrum was attenuated by 0.88 during the cross-polarization spin lock of 0.5 ms. Thus, the 47/ 53 (±6) trans/gauche ratio found in the spectrum had to be corrected slightly to 44/56 (±6).
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    • note
    • Generous financial support for K.S.-R. by a Beckman Young Investigator Award is gratefully acknowledged. Partial support was also provided by the NSF Materials Research Science and Engineering Center and by NSF grant DMR-9703916. K.S.-R. thanks M. Hong for stimulating discussions on data quantification.


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