Open spaces and molecular motions in carbon‐black‐ and silica‐loaded SBR investigated using positron annihilation
Open spaces and molecular motions in carbon‐black‐ and silica‐loaded SBR investigated using positron annihilation
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使用正电子湮灭研究炭黑和二氧化硅负载 SBR 中的开放空间和分子运动
DOI：
10.1002/polb.1058
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
S. Tanigawa
中科院分区：
文献类型：
--
作者：
A. Uedono;S. Fukui;M. Muramatsu;T. Ubukata;S. Kimura;S. Tanigawa
测量了填充炭黑（CB）或二氧化硅的丁苯橡胶（SBR）硫化橡胶的正电子寿命光谱。在 10 至 420 K 之间的温度下，未观察到 CB/SBR 硫化橡胶中的开放空间尺寸与不含填料的样品中的开放空间尺寸之间存在较大差异。高于玻璃化转变温度（Tg = 230 K）时，二氧化硅/SBR 硫化橡胶的情况也是如此。然而，在玻璃化转变温度以下，由于加入二氧化硅抑制了 SBR 中的局部分子运动，因此开放空间的尺寸减小。通过加入填料降低了开放空间的密度。然而，超过 400 K 时，二氧化硅/SBR 硫化胶的温度开始增加。对于 CB/SBR 硫化胶，即使在 420 K 的温度下，开放空间的引入也得到了很好的抑制。 © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 835–842, 2001
Lifetime spectra of positrons were measured for styrene–butadiene rubber (SBR) vulcanizates filled with carbon black (CB) or silica. At temperatures between 10 and 420 K, no large difference between the size of the open spaces in the CB/SBR vulcanizate and that in the specimen without the filler was observed. Above the glass-transition temperature (Tg = 230 K), the same was true for the silica/SBR vulcanizate. Below Tg, however, the size of the open spaces was reduced by the incorporation of silica as a result of the suppression of local molecular motions in the SBR. The density of the open spaces was reduced by the incorporation of the fillers. However, above 400 K it started to increase in the silica/SBR vulcanizate. For the CB/SBR vulcanizate, the introduction of open spaces was well suppressed, even at 420 K. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 835–842, 2001