Chemically crosslinked yet reprocessable epoxidized natural rubber via thermo-activated disulfide rearrangements
Chemically crosslinked yet reprocessable epoxidized natural rubber via thermo-activated disulfide rearrangements
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DOI：
10.1039/c5py00459d
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发表时间：
2015-01-01
影响因子：
4.6
通讯作者：
Leibler, L.
中科院分区：
文献类型：
--
作者：
Imbernon, L.;Oikonomou, E. K.;Leibler, L.
研究了化学交联环氧化天然橡胶（ENR）的热活化后处理性能。使用二硫代二丁酸（DTDB）作为交联剂将二硫醚基团引入橡胶中。DTDB固化的ENR由于橡胶的高分子量和有效的交联而呈现出强的弹性体特性。该材料在100摄氏度之前表现得像标准天然橡胶，并且由于二硫化物重排，在150摄氏度以上变得可再加工。在研磨成细粉后，交联橡胶可以再加工并恢复其大部分初始机械性能。热触发的二硫化物重排的特征在于应力松弛，蠕变/恢复，粘附力测试，和溶胀实验。与通过永久连接交联的ENR样品进行比较。
The thermo-activated reprocessing ability of a chemically crosslinked epoxidized natural rubber (ENR) is investigated. Disulfide groups are introduced into the rubber using dithiodibutyric acid (DTDB) as a crosslinker. DTDB-cured ENR presents strong elastomeric properties due to the high molecular weight of the rubber and efficient crosslinking. The material behaves like a standard natural rubber until 100 degrees C and becomes reprocessable above 150 degrees C, owing to disulfide rearrangements. After grinding to a fine powder, the crosslinked rubber can be reprocessed and recovers most of its initial mechanical properties. The heat-triggered disulfide rearrangements are characterized in terms of stress relaxation, creep/recovery, adhesion tests, and swelling experiments. Comparison is made with ENR samples crosslinked by permanent links.