Bimodal Distribution of Relaxational Modes for the Helix-Coil Transition in Poly(oxymethylene)

Ivet Bahar; Wayne L. Mattice; Wayne L. Mattice

doi:10.1021/ma00004a011

Bimodal Distribution of Relaxational Modes for the Helix-Coil Transition in Poly(oxymethylene)

Ivet Bahar
, Wayne L. Mattice
, Wayne L. Mattice

Laufer Center for Physical and Quantitative Biology

Bogazici University
University of Akron

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The helix-coil transition in poly(oxymethylene) has been investigated by using the recently developed dynamic rotational isomeric state (DRIS) model and the related matrix multiplication technique. The conditional probability P_τ(h/h) that a chain originally in the perfect helical form will preserve its state unchanged at a later time τ is evaluated for various chain lengths and temperatures. The transition to the coiled structure in an originally fully ordered helix is found to exhibit a bimodal relaxation, indicated by a plateau in the time decay curves of the conditional probabilities, before restoration of equilibrium distribution. This intermediate quasi-steady state preceding full relaxation is attributed to an equilibrium between perfect helices and chains possessing a single defect in the form of a trans bond, interrupting sequences of gauche bonds of the same sign.

Original language	English
Pages (from-to)	877-882
Number of pages	6
Journal	Macromolecules
Volume	24
Issue number	4
DOIs	https://doi.org/10.1021/ma00004a011
State	Published - Jul 1 1991

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title = "Bimodal Distribution of Relaxational Modes for the Helix-Coil Transition in Poly(oxymethylene)",

abstract = "The helix-coil transition in poly(oxymethylene) has been investigated by using the recently developed dynamic rotational isomeric state (DRIS) model and the related matrix multiplication technique. The conditional probability Pτ(h/h) that a chain originally in the perfect helical form will preserve its state unchanged at a later time τ is evaluated for various chain lengths and temperatures. The transition to the coiled structure in an originally fully ordered helix is found to exhibit a bimodal relaxation, indicated by a plateau in the time decay curves of the conditional probabilities, before restoration of equilibrium distribution. This intermediate quasi-steady state preceding full relaxation is attributed to an equilibrium between perfect helices and chains possessing a single defect in the form of a trans bond, interrupting sequences of gauche bonds of the same sign.",

author = "Ivet Bahar and Mattice, \{Wayne L.\} and Mattice, \{Wayne L.\}",

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T1 - Bimodal Distribution of Relaxational Modes for the Helix-Coil Transition in Poly(oxymethylene)

AU - Bahar, Ivet

AU - Mattice, Wayne L.

PY - 1991/7/1

Y1 - 1991/7/1

N2 - The helix-coil transition in poly(oxymethylene) has been investigated by using the recently developed dynamic rotational isomeric state (DRIS) model and the related matrix multiplication technique. The conditional probability Pτ(h/h) that a chain originally in the perfect helical form will preserve its state unchanged at a later time τ is evaluated for various chain lengths and temperatures. The transition to the coiled structure in an originally fully ordered helix is found to exhibit a bimodal relaxation, indicated by a plateau in the time decay curves of the conditional probabilities, before restoration of equilibrium distribution. This intermediate quasi-steady state preceding full relaxation is attributed to an equilibrium between perfect helices and chains possessing a single defect in the form of a trans bond, interrupting sequences of gauche bonds of the same sign.

AB - The helix-coil transition in poly(oxymethylene) has been investigated by using the recently developed dynamic rotational isomeric state (DRIS) model and the related matrix multiplication technique. The conditional probability Pτ(h/h) that a chain originally in the perfect helical form will preserve its state unchanged at a later time τ is evaluated for various chain lengths and temperatures. The transition to the coiled structure in an originally fully ordered helix is found to exhibit a bimodal relaxation, indicated by a plateau in the time decay curves of the conditional probabilities, before restoration of equilibrium distribution. This intermediate quasi-steady state preceding full relaxation is attributed to an equilibrium between perfect helices and chains possessing a single defect in the form of a trans bond, interrupting sequences of gauche bonds of the same sign.

UR - https://www.scopus.com/pages/publications/0026105384

U2 - 10.1021/ma00004a011

DO - 10.1021/ma00004a011

M3 - Article

AN - SCOPUS:0026105384

SN - 0024-9297

VL - 24

SP - 877

EP - 882

JO - Macromolecules

JF - Macromolecules

IS - 4

ER -

Bimodal Distribution of Relaxational Modes for the Helix-Coil Transition in Poly(oxymethylene)

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