Effect of sol–gel modified nano calcium carbonate (CaCO3) on the cure, mechanical and thermal properties of acrylonitrile butadiene rubber (NBR) nanocomposites

Abstract

The main goal of this work is to modify surface of nano CaCO 3 with silica by an elegant approach of solgel method and also to compare the influence of sol-gel modified nano CaCO 3 with unmodified nano CaCO 3 in the cure, mechanical and thermal properties of acrylonitrile butadiene rubber (NBR) nanocomposites. The surface modification of nano CaCO 3 is characterized by Fourier transform infrared spectra and Field emission scanning electron microscopy. The modified nano CaCO 3 causes significant improvement in the maximum rheometric torque (R ? ) and cure rate index value of NBR nanocomposites in comparison to unmodified nano CaCO 3 . More importantly, incorporation of surface modified nano CaCO 3 provides substantial enhancement in the mechanical properties of NBR nanocomposites and at 4 phr (parts per hundred parts of rubber) filler loading level tensile strength of modified nano CaCO 3 filled NBR vulcanizate shows a large increment by 37.33 % compare to that of unmodified nano CaCO 3 filled NBR vulcanizate. Thermogravimetric analysis reveals that sol-gel modified nano CaCO 3 delivers greater thermal stability in NBR nanocomposites than unmodified nano CaCO 3 . The fantastic enrichment in the cure, mechanical and thermal properties of NBR nanocomposites containing surface modified nano CaCO 3 will be the part of great interest for rubber researcher regarding the broad application of sol-gel modified nano CaCO 3 as important filler in rubber industry.

Understanding the reinforcing efficiency of waste eggshell‐derived nano calcium carbonate in natural rubber composites with maleated natural rubber as compatibilizer

“…. FTIR spectrum of WESNCC showed some characteristic peaks of CaCO 3 at about 872 and 712 cm −1 . The peak around 2,517 cm −1 was due to the presence of HCO 3 .…”

Development of a suitable nanostructured cure activator system for polychloroprene rubber nanocomposites with enhanced curing, mechanical and thermal properties

“…Cure parameters of CR vulcanizates (mix no [1][2][3][4][5] in presence of both nanostructured and conventional cure activators in different combinations are measured at 160°C and the results are presented in Table 2. The cure curves of various CR composites are shown in Fig.…”

“…Nowadays, the commercialization of nanotechnology becomes the part of great attention for the modern researchers as nanotechnology brings the proper advancement of rubber chemistry from industrial point of view. The properties of nanocomposites are greatly influenced by the size of nanoparticle and the degree of mixing between different phases [1][2][3][4][5]. The main reasons for the extraordinary improvement in the properties of rubber nanocomposites are low particle size, large surface area and uniform distribution of nanomaterials within the rubber matrix [1,2].…”

“…Our research group has been working on the development of rubber chemistry by the significant use of nanotechnology [1,11]. In the present study, nano-ZnO andMgO particles are prepared, and then the effect of nano-ZnO as cure activator in combination with nano-MgO on the vulcanization of CR is studied.…”

Preparation of PMMA grafted calcium carbonate whiskers and its reinforcement effect in PVC

“…Therefore, there is a need to improve the interfacial affinity of CaCO 3 for PVC. There are many methods for this purpose, such as the use of coupling agent , stearic acids , sol‐gel method , surfactant , and grafting and coating . In recent years, in situ polymerization has become a method of choice for preparing nanoparticle‐filled composites .…”