Abstract

The research described in the present work investigated the effect of thermal and photoaging and rubber waste content on the properties of acrylonitrile–butadiene rubber modified with montmorillonite (MMT). The MMT was mixed with plasticizer before the compounding in two roll mills. The modulus at 300% strain of samples without scrap maximally increased by 50% and 30% after thermal and photoaging, respectively, most probably due to an increase in the crosslink density. The maximum increases of the modulus, measured at 300% strain, of the unaged and aged rubber nanocomposite were exhibited by samples which each contained 10 wt.% of rubber waste. The MMT nanoparticles, well dispersed in the matrix, combined with good interfacial interaction between the different components, led to relative retention of the thermal and photo-oxidation aging coefficients and the large shape retention coefficient of the tested samples. Fourier transform infrared spectra showed that the crosslinking of the rubber nanocomposites containing waste occurred through the nitrile groups and C = C double bonds under the influence of aging. Scanning electron microscopy micrographs indicated that the MMT nanoparticles were uniformly embedded and well dispersed in the matrix. The rough and homogeneous fracture surfaces of the nanocomposite samples were not affected by incorporated waste. As a result of UV irradiation and thermal heating, aggregates were less visible and the fracture surfaces more homogeneous and compact.

摘要

本工作中描述的研究调查了热老化和光老化以及橡胶废料含量对蒙脱石 (MMT) 改性丙烯腈-丁二烯橡胶性能的影响。MMT在两台辊磨机中混炼前与增塑剂混合。在热老化和光老化后，不含废料的样品在 300% 应变下的模量分别最大增加了 50% 和 30%，这很可能是由于交联密度的增加。未老化和老化橡胶纳米复合材料在 300% 应变下测量的模量的最大增加由每个包含 10 wt.% 橡胶废料的样品显示。MMT纳米颗粒在基体中分散良好，结合不同组分之间良好的界面相互作用，导致热和光氧化老化系数的相对保留以及测试样品的较大形状保留系数。傅里叶变换红外光谱表明，在老化的影响下，含有废物的橡胶纳米复合材料通过腈基和C=C双键发生交联。扫描电子显微镜显微照片表明，MMT 纳米颗粒均匀嵌入并分散在基质中。纳米复合材料样品的粗糙和均匀的断裂表面不受掺入废物的影响。由于紫外线照射和热加热，聚集体不那么明显，断裂表面更加均匀和紧凑。傅里叶变换红外光谱表明，在老化的影响下，含有废物的橡胶纳米复合材料通过腈基和C=C双键发生交联。扫描电子显微镜显微照片表明，MMT 纳米颗粒均匀嵌入并分散在基质中。纳米复合材料样品的粗糙和均匀的断裂表面不受掺入废物的影响。由于紫外线照射和热加热，聚集体不那么明显，断裂表面更加均匀和紧凑。傅里叶变换红外光谱表明，在老化的影响下，含有废物的橡胶纳米复合材料通过腈基和C=C双键发生交联。扫描电子显微镜显微照片表明，MMT 纳米颗粒均匀嵌入并分散在基质中。纳米复合材料样品的粗糙和均匀的断裂表面不受掺入废物的影响。由于紫外线照射和热加热，聚集体不那么明显，断裂表面更加均匀和紧凑。纳米复合材料样品的粗糙和均匀的断裂表面不受掺入废物的影响。由于紫外线照射和热加热，聚集体不那么明显，断裂表面更加均匀和紧凑。纳米复合材料样品的粗糙和均匀的断裂表面不受掺入废物的影响。由于紫外线照射和热加热，聚集体不那么明显，断裂表面更加均匀和紧凑。