Enhancement of mechanical and tribological properties in ring‐opening metathesis polymerization functionalized molybdenum disulfide/polydicyclopentadiene nanocomposites

Pei

Advanced Composite Materials

et al. 2014

In this paper, either graphite (Gr) or carbon nanotubes (CNTs), or both of them were incorporated into carbon fabric reinforced phenolic (CFRP) composites, preparing by a dip-coating and heat molding process, the tribological properties of the resulting composites were investigated using a block-on-ring arrangement. The worn surfaces were observed by scanning electron microscope to understand the mechanism. Experimental results showed that the optimal Gr was more beneficial than CNTs in improving the tribological properties of the CFRP composites when they were singly incorporated. It is well worth noting that the friction and wear behavior of the CNTs-filled CFRP composites were improved further when Gr was added, indicating that there is a synergistic effect between them. Tribological tests under different sliding conditions revealed that the Gr and CNTs-filled CFRP composites seemed to be the most suitable for tribological applications under higher sliding speed and load, and oil lubrication.

Section: Introductionmentioning

confidence: 99%

The friction and wear properties of carbon nanotubes/graphite/carbon fabric reinforced phenolic polymer composites

Pei

Advanced Composite Materials

et al. 2014

“…In view of the above, the tribological properties of carbon fabric composites filled with PTW have been studied under different 1 sliding conditions in the present investigation. The influence of the PTW content, load, and sliding speed on the tribological behavior of the carbon fabric composites was examined.…”

Section: Introductionmentioning

confidence: 99%

“…Polymers based composite materials are extensively used in mechanical engineering because of their outstanding properties, such as high strength, light weight, excellent thermal stability, combined with wear and solvent resistance [1][2][3]. Pure polymer is often reinforced with desired properties by various reinforcing elements such as metallic oxide powder, fibers, nanoparticles, graphene, and organic materials to improve its wear resistance [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear of Potassium Titanate Whisker Filled Carbon Fabric/Phenolic Polymer Composites

Pei

et al. 2015

Journal of Tribology

Carbon fabric/phenolic composites modified with potassium titanate whisker (PTW) were prepared by a dip-coating and hot-press molding technique, and the tribological properties of the resulting composites were investigated systematically using a ring-on-block arrangement under different sliding conditions. Experimental results showed that the optimal PTW significantly decreased the wear-rate. The worn surfaces of the composites and the transfer film formed on the counterpart steel ring were examined by scanning electron microscopy (SEM) to reveal the wear mechanisms. The transfer films formed on the counterpart surfaces made contributions to the improvement of the tribological behavior of the carbon fabric composites. The friction and wear of the filled carbon fabric composites was significantly dependent on the sliding conditions. It is observed that the wear-rate increased with increasing applied load and sliding speeds.

“…Culver et al 20 used BiTO 3 nanocrystals functionalized with 10undecenoic acid to enhance the nanocrystal−polymer interface and mitigate losses in breakdown strength, as well as investigate the dielectric properties of PDCPD/BiTO 3 nanocomposites. Peng et al 21 successfully prepared MoS 2 /PDCPD nanocomposites to improve mechanical and wear resistance properties of PDCPD by means of in situ ring-opening metathesis polymerization (ROMP) using the RIM process. In addition, they successfully obtained a homogeneous dispersion by grafting dialkyldithiophosphate onto the MoS 2 surface by an in situ surface grafting method.…”

Section: Introductionmentioning

confidence: 99%

Dramatic Toughness Enhancement of Polydicyclopentadiene Composites by Incorporating Low Amounts of Vinyl-Functionalized SiO₂

Sun

et al. 2017

Ind. Eng. Chem. Res.

A dramatic improvement of the toughness of polydicyclopentadiene (PDCPD) composite containing low amounts of vinyl-functionalized SiO 2 was achieved, and the toughening mechanism was investigated. Considering the nonpolarity of the DCPD monomer and the probability of covalent bonding between SiO 2 and DCPD, vinyl-functionalized SiO 2 (V-SiO 2 ) with a high content of vinyl groups was prepared by a facile, reproducible, one-step, remodeled synthetic sol−gel process. The V-SiO 2 was characterized with respect to the content of vinyl groups, particle size, and morphology by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), dynamic light scattering (DLS), and field-emission scanning electron microscopy (FE-SEM). PDCPD/V-SiO 2 composites were prepared by in situ polymerization. The mechanical properties of the PDCPD/V-SiO 2 composites were investigated by universal testing machine (UTM) and dynamic mechanical analysis (DMA). A slight decrease in the yield strength was observed with increasing loading of V-SiO 2 , whereas the elongation at break increased substantially from 9.0% to 143.4% and the tensile toughness increased by a factor of 14 compared to that of neat PDCPD when just 0.2 wt % V-SiO 2 had been added. The dramatic toughness enhancement is attributed to the formation of microvoids and microcracks during the process of stretching, which can absorb a great deal of energy.