Mechanical properties of in situ modified graphene nanosheets‐reinforced polypropylene

Abstract

Despite the great potential of graphene as a nanofiller, its inhomogeneous dispersion in polymers remains a key challenge for the effective reinforcement of polymer. Herein, we exfoliated worm graphite into graphene by in situ liquidphase exfoliation, and the graphene was coated on the surface of polypropylene (PP) pellets by stirring. Further, we examined several treatment conditions and graphene contents. When graphene was centrifuged at 1000 rpm and the extrusion temperature of the composite was 230 C, the composite achieved optimal overall performance with the addition of only 0.2 wt% graphene. Compared to those of pure PP, the yield strength, bending modulus, and impact strength of the composites increased by 8.71%, 18.32%, and 45.75%, respectively. The thermal conductivity is increased by 29.5%. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) showed that the PP sample exhibited a significant heterogeneous nucleation effect due to graphene addition, improving the crystallization temperature and crystallinity of the composites. Contact angle measurement and scanning electron microscopy (SEM) revealed that the surface energy of graphene and PP are close to each other, and the graphene was well-dispersed in the PP matrix. Thus, this technique can optimize the processing properties and interface structure of graphenepolymer nanocomposites.

Antiviral capacity of polypropylene/(1‐Hexadecyl) trimethyl‐ammonium bromide composites against COVID‐19

“…[5] Due to these characteristics, it is also considered for the production of composite materials using different reinforcing that provides improved characteristics. [6][7][8] Quaternary ammonium salts (QAS) represent an accessible antiseptic with antiviral properties that could be used against SARS-CoV-2 due to their ability to form active bonds capable of breaking the protein capsid of different viruses and bacteria. [9][10][11][12][13][14] Ogilvie et al formulated different quaternary ammonium disinfectants, demonstrating that their formulations rapidly inactivate SARS-CoV-2, making them potentially useful for controlling SARS-CoV-2 spread in hospitals and the community.…”

“…[ 5 ] Due to these characteristics, it is also considered for the production of composite materials using different reinforcing that provides improved characteristics. [ 6 , 7 , 8 ]…”

Molybdenum disulfide of modified in situ as a nanofiller for enhanced mechanical properties and thermal properties of polypropylene composites

“…This is similar to the experimental results of Su et al [ 5 ] and confirms the SEM observations., indicating that the MoS 2 was successfully exfoliated and well bound together. [ 34 ]…”

Evaluation of specific total work of fracture in polypropylene/ethylene‐propylene diene monomer nanocomposites based on various graphene derivatives: Optimization by response surface methodology technique and correlation with microstructure properties

“…Despite the fact that PP is classified in semicrystalline polymers, the crystallization study of PP/EPDM nanocomposites is a contributing factor to fully understand their performances. [ 48 ] Hence, the effect of graphene type and PP/EPDM ratio on the crystallization behavior of the PP/EPDM nanocomposites was studied by DSC. The nonisothermal crystallization and melting parameters for all the specimens are listed in Table 8.…”