Effect of Annealing on the Main-Chain Motions of Poly(butylene terephthalate)

Joel R. Garbow; Jacob Schaefer

doi:10.1021/ma00170a020

Effect of Annealing on the Main-Chain Motions of Poly(butylene terephthalate)

Joel R. Garbow, Jacob Schaefer

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30 Scopus citations

Abstract

Spin-lattice T₁(C) and T₁ _p(C) relaxation and C-H dipolar line shapes have been obtained for the ring and aliphatic carbons of quenched and annealed poly(butylene terephthalate) by¹³C NMR. At room temperature the rings in a fraction of the amorphous regions undergo large-amplitude motions consistent with 180° flips superimposed on wiggles and oscillations. Amplitudes of the motions of the two types of methylene carbon of the butylene moiety are smaller and differ in the annealed but not in the quenched material. This contrast suggests the importance of interchain packing in determining cooperative main-chain motions in the amorphous regions of the polymer.

Original language	English
Pages (from-to)	819-822
Number of pages	4
Journal	Macromolecules
Volume	20
Issue number	4
DOIs	https://doi.org/10.1021/ma00170a020
State	Published - Jul 1 1987

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abstract = "Spin-lattice T1(C) and T1 p(C) relaxation and C-H dipolar line shapes have been obtained for the ring and aliphatic carbons of quenched and annealed poly(butylene terephthalate) by13C NMR. At room temperature the rings in a fraction of the amorphous regions undergo large-amplitude motions consistent with 180° flips superimposed on wiggles and oscillations. Amplitudes of the motions of the two types of methylene carbon of the butylene moiety are smaller and differ in the annealed but not in the quenched material. This contrast suggests the importance of interchain packing in determining cooperative main-chain motions in the amorphous regions of the polymer.",

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AU - Garbow, Joel R.

AU - Schaefer, Jacob

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N2 - Spin-lattice T1(C) and T1 p(C) relaxation and C-H dipolar line shapes have been obtained for the ring and aliphatic carbons of quenched and annealed poly(butylene terephthalate) by13C NMR. At room temperature the rings in a fraction of the amorphous regions undergo large-amplitude motions consistent with 180° flips superimposed on wiggles and oscillations. Amplitudes of the motions of the two types of methylene carbon of the butylene moiety are smaller and differ in the annealed but not in the quenched material. This contrast suggests the importance of interchain packing in determining cooperative main-chain motions in the amorphous regions of the polymer.

AB - Spin-lattice T1(C) and T1 p(C) relaxation and C-H dipolar line shapes have been obtained for the ring and aliphatic carbons of quenched and annealed poly(butylene terephthalate) by13C NMR. At room temperature the rings in a fraction of the amorphous regions undergo large-amplitude motions consistent with 180° flips superimposed on wiggles and oscillations. Amplitudes of the motions of the two types of methylene carbon of the butylene moiety are smaller and differ in the annealed but not in the quenched material. This contrast suggests the importance of interchain packing in determining cooperative main-chain motions in the amorphous regions of the polymer.

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Effect of Annealing on the Main-Chain Motions of Poly(butylene terephthalate)

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