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首页> 外文期刊>Journal of Applied Polymer Science >Continuous ultrasonic devulcanization of unfilled butyl rubber
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Continuous ultrasonic devulcanization of unfilled butyl rubber

机译：未填充丁基橡胶的连续超声波脱硫

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The devulcanization of resin-cured unfilled butyl rubber with a grooved-barrel ultrasonic reactor under various processing conditions was carried out. The experiments indicated that, because of the lower unsaturation and good thermal stability of butyl rubber, its devulcanization could be successfully accomplished only under severe ultrasonic-treatment conditions. Gel permeation chromatography measurements were carried out for the virgin gum and sol part of devulcanized samples to study the changes in the rubber network during the devulcanization process. The obtained data showed a significant molecular weight reduction and a broadening of the molecular weight distribution upon devulcanization, which indicated that the devulcanization and degradation of butyl rubber occurred simultaneously. The rheological properties showed that devulcanized butyl rubber was more elastic than the virgin gum. The vulcanizates of the devulcanized butyl rubber showed mechanical properties comparable to those of the virgin vulcanizate. The thermal behaviors of the virgin and devulcanized butyl rubber were different and were correlated to the double-bond content. The structural characteristics of the devulcanized butyl rubber were simulated with the Dobson-Gordon theory of rubber network statistics. A fairly good agreement between the experimental data and theoretical prediction was achieved. The simulation of devulcanized butyl rubber indicated that the rate of crosslink rupture was much higher than that of the main chain. (C) 2004 Wiley Periodicals, Inc.
机译：在各种加工条件下，利用开槽式超声波反应器对树脂固化的未填充丁基橡胶进行脱硫。实验表明，由于丁基橡胶的低不饱和度和良好的热稳定性，只有在严格的超声处理条件下才能成功完成脱硫。对脱硫样品的原始胶和溶胶部分进行了凝胶渗透色谱测量，以研究脱硫过程中橡胶网络的变化。所得数据表明，脱硫后分子量显着降低，分子量分布变宽，这表明丁基橡胶的脱硫和降解同时发生。流变性质表明，脱硫丁基橡胶比原始胶更具弹性。脱硫丁基橡胶的硫化橡胶显示出与原始硫化橡胶相当的机械性能。原始和脱硫丁基橡胶的热行为不同，并且与双键含量相关。用Dobson-Gordon橡胶网络统计理论模拟了脱硫丁基橡胶的结构特征。实验数据和理论预测之间取得了相当好的一致性。脱硫丁基橡胶的模拟表明，交联断裂的速率远高于主链。 （C）2004年Wiley Periodicals，Inc.

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