Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR

A.M. Aerdts; J.W. Haan, de; A.L. German; G.P.M. Velden, van der

doi:10.1021/ma00007a007

Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR

A.M. Aerdts, J.W. Haan, de, A.L. German, G.P.M. Velden, van der

Chemical Engineering and Chemistry

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Abstract

The methoxy 1H NMR signals in the 8 2.10-3.70 region for statistical styrene-methyl methacrylate copolymers have been reassigned for several methyl methacrylate centered triad/pentad resonances. Former literature assignments for statistical copolymers were inconsistent with experimental results. New peak assignments are completely based on pentad sequence distributions. Supporting evidence for these reassignments is 2-fold: First, comparison of theoretically calculated and experimentally observed peak areas, and the use of various independent procedures for the determination of the coisotacticity parameter u, yields consistent results (u = 0.44). Second, 2D-NOESY (Nuclear Overhauser effect spectroscopy) NMR experiments were carried out for alternating as well as for statistical copolymers. The results supported the proposed reassignments.

Original language	English
Pages (from-to)	1473-1479
Journal	Macromolecules
Volume	24
Issue number	7
DOIs	https://doi.org/10.1021/ma00007a007
Publication status	Published - 1991

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title = "Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR",

abstract = "The methoxy 1H NMR signals in the 8 2.10-3.70 region for statistical styrene-methyl methacrylate copolymers have been reassigned for several methyl methacrylate centered triad/pentad resonances. Former literature assignments for statistical copolymers were inconsistent with experimental results. New peak assignments are completely based on pentad sequence distributions. Supporting evidence for these reassignments is 2-fold: First, comparison of theoretically calculated and experimentally observed peak areas, and the use of various independent procedures for the determination of the coisotacticity parameter u, yields consistent results (u = 0.44). Second, 2D-NOESY (Nuclear Overhauser effect spectroscopy) NMR experiments were carried out for alternating as well as for statistical copolymers. The results supported the proposed reassignments.",

author = "A.M. Aerdts and {Haan, de}, J.W. and A.L. German and {Velden, van der}, G.P.M.",

year = "1991",

doi = "10.1021/ma00007a007",

language = "English",

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journal = "Macromolecules",

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T1 - Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR

AU - Aerdts, A.M.

AU - Haan, de, J.W.

AU - German, A.L.

AU - Velden, van der, G.P.M.

PY - 1991

Y1 - 1991

N2 - The methoxy 1H NMR signals in the 8 2.10-3.70 region for statistical styrene-methyl methacrylate copolymers have been reassigned for several methyl methacrylate centered triad/pentad resonances. Former literature assignments for statistical copolymers were inconsistent with experimental results. New peak assignments are completely based on pentad sequence distributions. Supporting evidence for these reassignments is 2-fold: First, comparison of theoretically calculated and experimentally observed peak areas, and the use of various independent procedures for the determination of the coisotacticity parameter u, yields consistent results (u = 0.44). Second, 2D-NOESY (Nuclear Overhauser effect spectroscopy) NMR experiments were carried out for alternating as well as for statistical copolymers. The results supported the proposed reassignments.

AB - The methoxy 1H NMR signals in the 8 2.10-3.70 region for statistical styrene-methyl methacrylate copolymers have been reassigned for several methyl methacrylate centered triad/pentad resonances. Former literature assignments for statistical copolymers were inconsistent with experimental results. New peak assignments are completely based on pentad sequence distributions. Supporting evidence for these reassignments is 2-fold: First, comparison of theoretically calculated and experimentally observed peak areas, and the use of various independent procedures for the determination of the coisotacticity parameter u, yields consistent results (u = 0.44). Second, 2D-NOESY (Nuclear Overhauser effect spectroscopy) NMR experiments were carried out for alternating as well as for statistical copolymers. The results supported the proposed reassignments.

U2 - 10.1021/ma00007a007

DO - 10.1021/ma00007a007

M3 - Article

SN - 0024-9297

VL - 24

SP - 1473

EP - 1479

JO - Macromolecules

JF - Macromolecules

IS - 7

ER -

Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR

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