Influence of average monomer sequence length on molecular mobility of acrylonitrile butadiene rubber

Hiroaki Ono; Hirotada Fujiwara; Shin Nishimura

doi:10.1295/koron.71.149

Influence of average monomer sequence length on molecular mobility of acrylonitrile butadiene rubber

Hiroaki Ono, Hirotada Fujiwara, Shin Nishimura

Research Center for Hydrogen Industrial Use and Storage

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

2 Citations (Scopus)

Abstract

The dominant factor of inhomogeneous molecular mobility (T₂) of acrylonitrile butadiene rubber (NBR), has been studied by pulsed ¹H NMR spectroscopy. We investigated the influence of the number-average molar mass of chain length between crosslinks (M_c) and average monomer sequence length of butadiene (LnBU), which is an inhomogeneity of the first ordered structure. The FID analysis shows that vulcanized samples are composed of 3 components with different molecular mobility, T_2S, T_2M and T_2L. Moreover, we evaluated the M_c dependency of T_2S, T_2M and the ¹H ratio and the change of T_2S, T_2M and the ¹H ratio of before and after vulcanization against LnBU. According to the results, the LnBU showed a more dominant correlation to T₂ and the ¹H ratio than M_c. That implies that the NBR molecular chain with almost the same average monomer sequence length of acrylonitrile mobility at 30°C originates from the inhomogeneity of the first ordered structure of NBR.

Original language	English
Pages (from-to)	149-158
Number of pages	10
Journal	KOBUNSHI RONBUNSHU
Volume	71
Issue number	4
DOIs	https://doi.org/10.1295/koron.71.149
Publication status	Published - 2014

All Science Journal Classification (ASJC) codes

Chemical Engineering (miscellaneous)
Materials Science (miscellaneous)
Environmental Science(all)
Polymers and Plastics

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title = "Influence of average monomer sequence length on molecular mobility of acrylonitrile butadiene rubber",

abstract = "The dominant factor of inhomogeneous molecular mobility (T2) of acrylonitrile butadiene rubber (NBR), has been studied by pulsed 1H NMR spectroscopy. We investigated the influence of the number-average molar mass of chain length between crosslinks (Mc) and average monomer sequence length of butadiene (LnBU), which is an inhomogeneity of the first ordered structure. The FID analysis shows that vulcanized samples are composed of 3 components with different molecular mobility, T2S, T2M and T2L. Moreover, we evaluated the Mc dependency of T2S, T2M and the 1H ratio and the change of T2S, T2M and the 1H ratio of before and after vulcanization against LnBU. According to the results, the LnBU showed a more dominant correlation to T2 and the 1H ratio than Mc. That implies that the NBR molecular chain with almost the same average monomer sequence length of acrylonitrile mobility at 30°C originates from the inhomogeneity of the first ordered structure of NBR.",

author = "Hiroaki Ono and Hirotada Fujiwara and Shin Nishimura",

note = "Publisher Copyright: {\textcopyright} 2014, The Society of Polymer Science, Japan.",

year = "2014",

doi = "10.1295/koron.71.149",

language = "English",

volume = "71",

pages = "149--158",

journal = "KOBUNSHI RONBUNSHU",

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T1 - Influence of average monomer sequence length on molecular mobility of acrylonitrile butadiene rubber

AU - Ono, Hiroaki

AU - Fujiwara, Hirotada

AU - Nishimura, Shin

PY - 2014

Y1 - 2014

N2 - The dominant factor of inhomogeneous molecular mobility (T2) of acrylonitrile butadiene rubber (NBR), has been studied by pulsed 1H NMR spectroscopy. We investigated the influence of the number-average molar mass of chain length between crosslinks (Mc) and average monomer sequence length of butadiene (LnBU), which is an inhomogeneity of the first ordered structure. The FID analysis shows that vulcanized samples are composed of 3 components with different molecular mobility, T2S, T2M and T2L. Moreover, we evaluated the Mc dependency of T2S, T2M and the 1H ratio and the change of T2S, T2M and the 1H ratio of before and after vulcanization against LnBU. According to the results, the LnBU showed a more dominant correlation to T2 and the 1H ratio than Mc. That implies that the NBR molecular chain with almost the same average monomer sequence length of acrylonitrile mobility at 30°C originates from the inhomogeneity of the first ordered structure of NBR.

AB - The dominant factor of inhomogeneous molecular mobility (T2) of acrylonitrile butadiene rubber (NBR), has been studied by pulsed 1H NMR spectroscopy. We investigated the influence of the number-average molar mass of chain length between crosslinks (Mc) and average monomer sequence length of butadiene (LnBU), which is an inhomogeneity of the first ordered structure. The FID analysis shows that vulcanized samples are composed of 3 components with different molecular mobility, T2S, T2M and T2L. Moreover, we evaluated the Mc dependency of T2S, T2M and the 1H ratio and the change of T2S, T2M and the 1H ratio of before and after vulcanization against LnBU. According to the results, the LnBU showed a more dominant correlation to T2 and the 1H ratio than Mc. That implies that the NBR molecular chain with almost the same average monomer sequence length of acrylonitrile mobility at 30°C originates from the inhomogeneity of the first ordered structure of NBR.

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Influence of average monomer sequence length on molecular mobility of acrylonitrile butadiene rubber

Abstract

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