Natural rubber (NR) has been extruded without and with ultrasonic treatment at various ultrasonic amplitudes. The effect of ultrasonic treatment on structure of NR, its compounds with silica and silica/silane and their vulcanizates have been studied. Processing‐structure‐properties relationship of untreated and treated materials has been established. With the increase of ultrasonic amplitude power consumption is increased and die pressure is reduced. Size exclusion chromatography measurements show that the NR molecular weight is reduced with the ultrasonic treatment. The storage modulus and loss modulus, complex viscosity and loss tangent results also confirmed the degradation of NR chains by imposition of ultrasound, especially after treatment at high amplitude. After mixing with silica and silica/silane, it was found that degradation of NR caused a reduction in the rubber–filler interaction, an increase in the filler–filler interaction and flocculation upon heating. Physical properties of vulcanizates including M100, ultimate elongation, and stress at break are also deteriorated. POLYM. ENG. SCI., 60:925–934, 2020. © 2020 Society of Plastics Engineers

中文翻译：

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NR口香糖的超声挤压及其对未填充和填充二氧化硅的NR的结构和性能的影响

天然橡胶（NR）在不经过超声波处理和以不同超声波振幅进行超声波处理的情况下被挤出。研究了超声波处理对NR，其与二氧化硅和二氧化硅/硅烷的化合物及其硫化橡胶的结构的影响。建立了未处理和已处理材料的加工-结构-性能关系。随着超声振幅的增加，功耗增加，模具压力降低。尺寸排阻色谱法测量表明，通过超声处理，NR分子量降低。储能模量和损耗模量，复数粘度和损耗角正切结果还证实了通过施加超声波，尤其是在高振幅处理后，NR链的降解。与二氧化硅和二氧化硅/硅烷混合后，结果发现，NR的降解会导致橡胶与填料之间的相互作用降低，填料与填料之间的相互作用增加以及加热时的絮凝。包括M100在内的硫化胶的物理性能，极限伸长率和断裂应力也会降低。POLYM。ENG。SCI。，60：925–934，2020.©2020塑料工程师协会