Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy
Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy
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通过正电子湮灭寿命光谱研究炭黑填充异戊二烯橡胶的自由体积
DOI:
10.1002/app.52857
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发表时间:
2022
影响因子:
3
通讯作者:
Fujinami Masanori
中科院分区:
文献类型:
--
作者:
Chiari Luca;Nippa Madoka;Ikeda Yuko;Sato Tomoyuki;Tsujimoto Yuji;Kato Atsushi;Chiba Naomichi;Fujinami Masanori
The free volume in the amorphous phase of a simple carbon‐black‐filled peroxide cross‐linked isoprene rubber (IR) is investigated by positron annihilation lifetime spectroscopy to clarify the structural changes in the rubber phase by the carbon black (CB) fillers. Theortho‐positronium (o‐Ps) pick‐off annihilation lifetime measured in the rubber without CB is around 2.8 ns and is found to be almost constant even after CB filling. This result indicates that in a portion of the rubber phase the free volume remains similar in size to that in the cross‐linked IR without CB. Theo‐Ps intensity drastically decreases from 37% without CB to 15% with a CB loading as high as 80 phr. This decline is revealed to exceed the contribution, which is expected only from the decrease in the fraction of the amorphous phase by CB addition, by a factor of 0.37 at the highest CB loading. The additional reduction is related to the generation of a bound rubber layer surrounding the CB fillers with low molecular‐chain mobility where positronium formation is inhibited. The decrease rate is found to represent the volume of this rigid rubber phase and strongly depend on the formation of the CB network structure.
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DOI:
10.1002/pssc.200675783
发表时间:
2007
期刊:
Physica Status Solidi (c)
影响因子:
--
作者:
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DOI:
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DOI:
10.1002/polb.1058
发表时间:
2001
期刊:
Journal of Polymer Science Part B
影响因子:
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