Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin-spin relaxation time

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Abstract

To identify components with different spin-spin relaxation times, T 2, in the solid-echo pulse proton nuclear magnetic resonance ( 1H-NMR) spectra of crude acrylonitrile (AN)-butadiene rubbers (NBRs) with five different AN contents, we tried to understand the inhomogeneity in the crude NBRs in terms of their microstructures and molecular mobilities. The results of small-angle X-ray scattering, differential scanning calorimetry and dynamic mechanical analysis showed that crude NBRs have a single-phase and homogeneous morphology on the nanoscale. The microstructure of the crude NBRs shows alternately copolymerized AN-butadiene (BU) and BU block sequences, as indicated by 1H-NMR spectra. The T2 of the crude NBRs revealed three components with different molecular mobilities, even in homogeneous samples. The content of the highest-mobility component with T 2l is negligible. Judging from the AN content dependence of the 1H ratio of these components, the low-mobility component with T 2s and high-mobility component with T2m were assigned to the alternately copolymerized AN-BU sequences and BU block sequences, respectively.

Original languageEnglish
Pages (from-to)1027-1032
Number of pages6
JournalPolymer Journal
Volume45
Issue number10
DOIs
Publication statusPublished - Oct 1 2013

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Polyacrylonitriles
Butadiene
Relaxation time
Acrylonitrile
Rubber
Nuclear magnetic resonance
polyacrylonitrile
1,3-butadiene
Microstructure
Dynamic mechanical analysis
X ray scattering
Differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin-spin relaxation time",
abstract = "To identify components with different spin-spin relaxation times, T 2, in the solid-echo pulse proton nuclear magnetic resonance ( 1H-NMR) spectra of crude acrylonitrile (AN)-butadiene rubbers (NBRs) with five different AN contents, we tried to understand the inhomogeneity in the crude NBRs in terms of their microstructures and molecular mobilities. The results of small-angle X-ray scattering, differential scanning calorimetry and dynamic mechanical analysis showed that crude NBRs have a single-phase and homogeneous morphology on the nanoscale. The microstructure of the crude NBRs shows alternately copolymerized AN-butadiene (BU) and BU block sequences, as indicated by 1H-NMR spectra. The T2 of the crude NBRs revealed three components with different molecular mobilities, even in homogeneous samples. The content of the highest-mobility component with T 2l is negligible. Judging from the AN content dependence of the 1H ratio of these components, the low-mobility component with T 2s and high-mobility component with T2m were assigned to the alternately copolymerized AN-BU sequences and BU block sequences, respectively.",
author = "Hiroaki Ono and Hirotada Fujiwara and Shin Nishimura",
year = "2013",
month = "10",
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doi = "10.1038/pj.2013.37",
language = "English",
volume = "45",
pages = "1027--1032",
journal = "Polymer Journal",
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T1 - Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin-spin relaxation time

AU - Ono, Hiroaki

AU - Fujiwara, Hirotada

AU - Nishimura, Shin

PY - 2013/10/1

Y1 - 2013/10/1

N2 - To identify components with different spin-spin relaxation times, T 2, in the solid-echo pulse proton nuclear magnetic resonance ( 1H-NMR) spectra of crude acrylonitrile (AN)-butadiene rubbers (NBRs) with five different AN contents, we tried to understand the inhomogeneity in the crude NBRs in terms of their microstructures and molecular mobilities. The results of small-angle X-ray scattering, differential scanning calorimetry and dynamic mechanical analysis showed that crude NBRs have a single-phase and homogeneous morphology on the nanoscale. The microstructure of the crude NBRs shows alternately copolymerized AN-butadiene (BU) and BU block sequences, as indicated by 1H-NMR spectra. The T2 of the crude NBRs revealed three components with different molecular mobilities, even in homogeneous samples. The content of the highest-mobility component with T 2l is negligible. Judging from the AN content dependence of the 1H ratio of these components, the low-mobility component with T 2s and high-mobility component with T2m were assigned to the alternately copolymerized AN-BU sequences and BU block sequences, respectively.

AB - To identify components with different spin-spin relaxation times, T 2, in the solid-echo pulse proton nuclear magnetic resonance ( 1H-NMR) spectra of crude acrylonitrile (AN)-butadiene rubbers (NBRs) with five different AN contents, we tried to understand the inhomogeneity in the crude NBRs in terms of their microstructures and molecular mobilities. The results of small-angle X-ray scattering, differential scanning calorimetry and dynamic mechanical analysis showed that crude NBRs have a single-phase and homogeneous morphology on the nanoscale. The microstructure of the crude NBRs shows alternately copolymerized AN-butadiene (BU) and BU block sequences, as indicated by 1H-NMR spectra. The T2 of the crude NBRs revealed three components with different molecular mobilities, even in homogeneous samples. The content of the highest-mobility component with T 2l is negligible. Judging from the AN content dependence of the 1H ratio of these components, the low-mobility component with T 2s and high-mobility component with T2m were assigned to the alternately copolymerized AN-BU sequences and BU block sequences, respectively.

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