Comparison of morphology and mechanical properties of peroxide‐cured acrylonitrile butadiene rubber/LDH composites prepared from different organically modified LDHs

Abstract

Rubber compounds based on acrylonitrile butadiene rubber (NBR) containing organically modified layered double hydroxides (LDHs) were prepared using peroxide as a curing agent. The LDHs intercalated by organic compounds including sodium styrene sulfonate (SSS) and sodium dodecylbenzene sulfonate (SDBS) were investigated using thermogravimetric analysis (TGA) and X‐ray diffraction (XRD) while the unmodified LDHs were used as contrast. Experimental results from TGA and XRD showed that both SSS‐ and SDBS‐intercalated LDHs were successfully obtained. The morphology of the LDH composites was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and XRD. The chemical structure of NBR/LDHs compounds were measured by Fourier transform infrared spectrum. The thermal properties were measured by TGA and differential scanning calorimetry. Other properties such as mechanical and swelling properties were also investigated. The results showed that a chemical bonding between organically modified LDHs and rubber matrix through SSS was built during vulcanization, which leads to improved interfacial strength of the cured compound. A high‐performance acrylonitrile butadiene rubber/SSS‐modified LDH compound, which has two times higher tensile strength than cured pure rubber without significant loss of elongation, was obtained. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Aging-Resistant Functionalized LDH–SAS/Nitrile-Butadiene Rubber Composites: Preparation and Study of Aging Kinetics/Anti-Aging Mechanism

“…These typical LDH absorption bands are attributed to the stretching vibration of hydroxyl groups [ 43 ], the bending vibration of metal hydroxide sheets [ 49 ] and the stretching vibration of NO 3 − in the LDH interlayer [ 41 , 49 ], respectively. The stretching bands at 1623 and 1635 cm −1 are attributed to the bending vibration of the LDH interlayer–water interaction [ 16 , 37 , 41 ]. It should be noticed that the interlayer–water absorbing peak shifted from 1635 to 1623 cm −1 when LDH–NO 3 was changed to LDH–SAS.…”

“…For LDH–SAS, the absorption peaks at about 3411 and 3223 cm −1 were mainly related to the primary amine bending vibration of N–H. The peaks at about 1183, 1122 and 1036 cm −1 of LDH–SAS are attributed to the stretching vibration of sulfonate groups [ 41 ], and the peak at about 833 cm −1 is the bending vibration of 1,4-substituted benzene rings. X-ray diffraction and FTIR spectroscopy thus indicated the successful preparation of LDH–SAS.…”

“…In addition, organically modified LDHs can also be applied to rubber composite materials [ 39 ]. NBR has similarly been modified with LDHs to improve its mechanical, thermal and optical properties [ 32 , 40 , 41 , 42 , 43 , 44 , 45 ], with just previous one report on the influence of LDHs on the thermal oxidative aging resistance in NBR materials existing in the literature [ 7 ]. NBR complexes using modified LDHs have also been prepared to improve mechanical properties.…”

“…NBR complexes using modified LDHs have also been prepared to improve mechanical properties. For example, the influence of sodium lignosulfonate-modified LDHs (SLS-LDH) and sodium styrene sulfonate-modified LDHs (LDH-SSS) on the mechanical properties of NBR has been investigated [ 41 , 43 ]. In our previous study [ 7 ], double bond-containing organic fillers LDH-SSS (sodium styrene sulfonate modified LDHs) were successfully prepared and used in NBR composites.…”

Exploring the role of stearic acid in modified zinc aluminum layered double hydroxides and their acrylonitrile butadiene rubber nanocomposites

“…LDH based on zinc and aluminum is one such material that qualifies itself as MFA, having the ability to replace zinc oxide in rubbers and also participating in mechanical reinforcement of the rubber matrix. Research works on rubber LDH composites are ample, yet the treatment of LDH as a MFA is not very much looked upon …”