A route to quantitative 13C NMR analysis of multicomponent polyesters

Publication: ResearchJournal article – Annual report year: 1991

Standard

A route to quantitative 13C NMR analysis of multicomponent polyesters. / Hvilsted, S.

In: Makromolekulare Chemie. Macromolecular Symposia, Vol. 52, No. 1, 1991, p. 199-208.

Publication: ResearchJournal article – Annual report year: 1991

Harvard

APA

CBE

MLA

Vancouver

Author

Hvilsted, S. / A route to quantitative 13C NMR analysis of multicomponent polyesters.

In: Makromolekulare Chemie. Macromolecular Symposia, Vol. 52, No. 1, 1991, p. 199-208.

Publication: ResearchJournal article – Annual report year: 1991

Bibtex

@article{6ee57b8b52f34932952a6ece16d4da7d,
title = "A route to quantitative <sup>1</sup><sup>3</sup>C NMR analysis of multicomponent polyesters",
publisher = "Wiley",
author = "S. Hvilsted",
year = "1991",
doi = "10.1002/masy.19910520118",
volume = "52",
number = "1",
pages = "199--208",
journal = "Makromolekulare Chemie. Macromolecular Symposia",
issn = "0258-0322",

}

RIS

TY - JOUR

T1 - A route to quantitative <sup>1</sup><sup>3</sup>C NMR analysis of multicomponent polyesters

A1 - Hvilsted,S.

AU - Hvilsted,S.

PB - Wiley

PY - 1991

Y1 - 1991

N2 - <p>A protocol for quantitative sequential <sup>13</sup>C NMR analysis is developed for polyesters composed of trimethylol propane (TMP), neopentyl glycol (NPG), and adipic and isophthalic acids. TMP centred, structural models with methyl adipate and isophthalate branches in all possible combinations are synthesized and purified. A detailed <sup>13</sup>C NMR investigation of the models unequivocally allows the identification of the TMP polyester structural sequences through the quaternary TMP carbon multiplicity. Spin-lattice relaxation times, T<sub>1</sub>, of model quaternary TMP carbons are in the 2.3–5.2 s range, depending on the size of the specific model. This relaxation behaviour defines the experimental conditions for obtaining the quantitative assessment of all polyester polyol structural sequences based on quaternary TMP and NPG carbons. The special case dealt with here additionally centers all acid moieties between poyols in triads and thus makes quantitative determinations of all polyester constituents possible.</p>

AB - <p>A protocol for quantitative sequential <sup>13</sup>C NMR analysis is developed for polyesters composed of trimethylol propane (TMP), neopentyl glycol (NPG), and adipic and isophthalic acids. TMP centred, structural models with methyl adipate and isophthalate branches in all possible combinations are synthesized and purified. A detailed <sup>13</sup>C NMR investigation of the models unequivocally allows the identification of the TMP polyester structural sequences through the quaternary TMP carbon multiplicity. Spin-lattice relaxation times, T<sub>1</sub>, of model quaternary TMP carbons are in the 2.3–5.2 s range, depending on the size of the specific model. This relaxation behaviour defines the experimental conditions for obtaining the quantitative assessment of all polyester polyol structural sequences based on quaternary TMP and NPG carbons. The special case dealt with here additionally centers all acid moieties between poyols in triads and thus makes quantitative determinations of all polyester constituents possible.</p>

KW - Avancerede materialer og materialeteknologi

U2 - 10.1002/masy.19910520118

DO - 10.1002/masy.19910520118

JO - Makromolekulare Chemie. Macromolecular Symposia

JF - Makromolekulare Chemie. Macromolecular Symposia

SN - 0258-0322

IS - 1

VL - 52

SP - 199

EP - 208

ER -