Shafiee Sara, Bazli Leila, Karrabi Mohammad, Ghoreishy Mir Hamid Reza, Bazli Milad
Rubber Group, Processing Department, Iran Polymer and Petrochemical Institute, Tehran 1497713115, Iran.
College of Engineering, IT and Environment, Charles Darwin University, Darwin 0801, Australia.
Polymers (Basel). 2022 Apr 3;14(7):1463. doi: 10.3390/polym14071463.
In this study, the effects of NBR polarity and organoclay addition on the curing, rheological, mechanical, and thermal properties of an NBR/phenolic resin blend were investigated. The samples were prepared using a two-roll mill. The results showed that rheological and tensile properties improved due to the good distribution of nanoparticles, as well as the good compatibility of nitrile butadiene rubber with phenolic resin. The addition of 1.5 phr of nanoparticles to blends containing 33% and 45% acrylonitrile increased the curing torque difference by approximately 12% and 28%, respectively. In addition, the scorch time and curing time decreased in nanocomposites. Adding nanoparticles also increased the viscosity. The addition of phenolic resins and nanoparticles has a similar trend in modulus changes, and both of these factors increase the stiffness and, consequently, the elastic and viscous modulus of the specimens. Adding 1.5 phr of organoclay increased the tensile strength of the blends by around 8% and 13% in the samples with low and high content of acrylonitrile, respectively. Increasing the temperature of the tensile test led to a reduction in the tensile properties of the samples. Tensile strength, elongation at break, modulus, and hardness of the samples increased with increasing organoclay content. In addition, with increasing nanoparticle concentration, the samples underwent lower deterioration in tensile strength and Young's modulus at different temperatures compared to the blends. In the samples containing 1.5 phr of organoclay, the thermal decomposition temperatures were enhanced by around 24 and 27 °C for low and high acrylonitrile content.
在本研究中，研究了丁腈橡胶（NBR）极性和有机黏土添加量对NBR/酚醛树脂共混物的硫化、流变、力学和热性能的影响。使用双辊炼胶机制备样品。结果表明，由于纳米粒子的良好分散以及丁腈橡胶与酚醛树脂的良好相容性，流变性能和拉伸性能得到改善。向含有33%和45%丙烯腈的共混物中添加1.5份纳米粒子，分别使硫化扭矩差值提高了约12%和28%。此外，纳米复合材料的焦烧时间和硫化时间缩短。添加纳米粒子还增加了粘度。酚醛树脂和纳米粒子的添加在模量变化方面具有相似的趋势，这两个因素均提高了样品的刚度，进而提高了弹性模量和粘性模量。添加1.5份有机黏土分别使低丙烯腈含量和高丙烯腈含量样品的共混物拉伸强度提高了约8%和13%。拉伸试验温度升高导致样品拉伸性能下降。样品的拉伸强度、断裂伸长率、模量和硬度随有机黏土含量的增加而提高。此外，与共混物相比，随着纳米粒子浓度的增加，样品在不同温度下的拉伸强度和杨氏模量劣化程度更低。在含有1.5份有机黏土的样品中，低丙烯腈含量和高丙烯腈含量样品的热分解温度分别提高了约24℃和27℃。
