Effect of different ionic liquids on the dispersion and phase selective wetting of carbon nanotubes in rubber blends

Rubber blends are widely used for combining the advantages of each rubber component. However, to date, how to determine and distinguish the vulcanization kinetics for each single rubber phase in rubber blends during the co‐vulcanization process is still a challenge. Herein, high‐resolution pyrolysis gas chromatography–mass spectrometry (HR PyGC‐MS) was employed for the first time to investigate the vulcanization kinetics of natural rubber (NR) and styrene–butadiene rubber (SBR) in NR/SBR blends filled with modified silica (SiO2). The reaction rates of crosslinking of each rubber phase in NR/SBR were calculated, which showed that the crosslinking rates of NR were much lower than those of SBR phase in the unfilled blends and blends filled with unmodified and silane modified silica. Interestingly, the vulcanization rates of NR and SBR phase were approximately same in the vulcanization accelerator modified silica filled blends, showing better co‐vulcanization. In addition, the vulcanization accelerator modified silica was uniformly dispersed and endowed rubber blends with higher mechanical strength compared to the untreated silica. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48838.

Section: Introductionmentioning

confidence: 99%

Effects of modified silica on the co‐vulcanization kinetics and mechanical performances of natural rubber/styrene–butadiene rubber blends

Dong

Luo

Lin

et al. 2019

“…On the other hand, the interaction among the IL, the filler, and the substrate determines whether the filler can function in the matrix. Le et al . studied the effect of ILs (alkylimidazolium salts) with respect to their anion type and the length of alkyl chain as dispersing and coupling agent in CNT‐filled styrene butadiene rubber (SBR)/natural rubber (NR) blends.…”

Section: Introductionmentioning

confidence: 99%

High‐performance natural rubber latex composites developed by a green approach using ionic liquid‐modified multiwalled carbon nanotubes

Zhang

et al. 2018

The effect of multiwalled carbon nanotubes (MWCNTs) modified by a hydrophilic ionic liquids (ILs), including 1‐ethyl‐3‐methylimidazolium bromide and 1‐hexyl‐3‐methylimidazolium bromide, was studied. The obtained water‐suspensible carbon nanotubes (CNTs) were still homogeneously distributed in water a month after sonication. The microstructural development of filler networks and the uniform dispersion of MWCNTs in the presence of IL were analyzed by TEM. The apparent physical (cation–π/π–π) interaction between the MWCNTs and the IL was characterized by Raman spectroscopy, DSC, and TGA. Furthermore, high‐performance composites of natural rubber latex (NRL) and CNTs modified with IL were obtained by the liquid latex blending method. The CNTs were homogeneously distributed in the matrix and CNT–ILs improved the fatigue resistance and mechanical properties of the NRL/CNT–IL composites. This study demonstrates a simple and eco‐friendly approach to develop multifunctional advanced materials based on IL‐modified MWCNT elastomer composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46588.

“…The silver mapping revealed an improvement in the distribution of the silver particles when using IL‐1 regardless of the quantity of IL used. Le et al ., obtained similar morphological changes in rubber composites with carbon nanotubes (CNT) in the presence of various ionic liquids. They reported that the presence of ionic liquids improved the interaction between both phases.…”

Section: Resultsmentioning

confidence: 80%

Influence of ionic liquid on graphite/silver nanoparticles dispersion and antibacterial properties against Escherichia coli of PP/EPDM composite coatings

Nuñez‐Figueredo¹,

Sánchez-Valdés²,

Ramı́rez-Vargas³

et al. 2019

In this work, graphite doped with silver nanoparticles are synthesized and coated onto a PP/EPDM blend surface. Three nanoparticles deposition methods are used. In one method, the nanoparticles are directly deposited on previously corona discharge‐treated TPO surface. Another method is by compression deposition of nanoparticles in a thin layer forming a segregated coating. In the last method, a nanoparticle‐polymer composite is deposited and then treated by corona discharge to expose the deposited nanoparticles. These last two methods show excellent antimicrobial activity (R = 2.8 and 3.9, respectively) and higher inhibition values (85% and 89%, respectively) against Escherichia coli strains. The effect of using HMIMPF6 and BMIMBF4 ionic liquids on particle dispersion and antibacterial activity against E. coli is evaluated. Using ionic liquids enhance the antibacterial activity (from R = 3.9 to 5.4) and inhibition rates (from 89% to 99.8%) of the samples. As a result, a thermoplastic elastomer (TPE) material with enhanced antibacterial properties against E. coli is obtained using ionic liquids, which offer significant promise as a material for medical applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48714.