Aloui Sahbi, Deckmann Horst, Trimbach Jürgen, Lacayo-Pineda Jorge
NETZSCH-Gerätebau GmbH, Schulstraße 6, 29693 Ahlden, Germany.
Hansen & Rosenthal KG, Am Sandtorkai 64, 20457 Hamburg, Germany.
Polymers (Basel). 2022 May 23;14(10):2126. doi: 10.3390/polym14102126.
Four styrene butadiene rubber (SBR) compounds were prepared to investigate the influence of the plasticizer polarity on the mechanical stability of the filler network using simultaneous mechanical and dielectric analysis. One compound was prepared without plasticizer and serves as a reference. The other three compounds were expanded with different plasticizers that have different polarities. Compared with an SBR sample without plasticizer, the conductivity of mechanically unloaded oil-extended SBR samples decreases by an order of magnitude. The polarity of the plasticizer shows hardly any influence because the plasticizers only affect the distribution of the filler clusters. Under static load, the dielectric properties seem to be oil-dependent. However, this behavior also results from the new distribution of the filler clusters caused by the mechanical damage and supported by the polarity grade of the plasticizer used. The Cole-Cole equation affirms these observations. The Cole-Cole relaxation time and thus, the position of maximal dielectric loss increases as the polarity of the plasticizer used is also increased. This, in turn, decreases the broadness parameter α implying a broader response function.
制备了四种丁苯橡胶（SBR）化合物，以通过同时进行机械和介电分析来研究增塑剂极性对填料网络机械稳定性的影响。制备了一种不含增塑剂的化合物作为参考。其他三种化合物用具有不同极性的不同增塑剂进行了扩展。与不含增塑剂的SBR样品相比，机械卸载的充油丁苯橡胶样品的电导率降低了一个数量级。增塑剂的极性几乎没有显示出任何影响，因为增塑剂仅影响填料聚集体的分布。在静态负载下，介电性能似乎取决于油。然而，这种行为也是由机械损伤引起的填料聚集体的新分布导致的，并由所用增塑剂的极性等级所支持。科尔-科尔方程证实了这些观察结果。随着所用增塑剂极性的增加，科尔-科尔弛豫时间以及最大介电损耗的位置也增加。这反过来又降低了展宽参数α，这意味着响应函数更宽。
