Reinforcement of polychloroprene by grafted silica nanoparticles

Abbas, Zaid M.; Tawfilas, M; Khani, Mohammed M.; Golian, Karl; Marsh, Zachary M.; Jhalaria, Mayank; Simonutti, Roberto; Stefik, Morgan; Kumar, Sanat K.; Benicewicz, Brian C.

doi:10.1016/j.polymer.2019.03.031

Cited by 34 publications

(33 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the possible ways to get around this behavior is to graft polymer chains on the surface of the nanoparticles. Achieving a proper dispersion of nanoparticles inside the polymer melt is associated with a considerable enhancement of its properties [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Potential of Mean Force between Bare or Grafted Silica/Polystyrene Surfaces from Self-Consistent Field Theory

et al. 2021

View full text Add to dashboard Cite

We investigate single and opposing silica plates, either bare of grafted, in contact with vacuum or melt phases, using self-consistent field theory. Solid–polymer and solid–solid nonbonded interactions are described by means of a Hamaker potential, in conjunction with a ramp potential. The cohesive nonbonded interactions are described by the Sanchez-Lacombe or the Helfand free energy densities. We first build our thermodynamic reference by examining single surfaces, either bare or grafted, under various wetting conditions in terms of the corresponding contact angles, the macroscopic wetting functions (i.e., the work of cohesion, adhesion, spreading and immersion), the interfacial free energies and brush thickness. Subsequently, we derive the potential of mean force (PMF) of two approaching bare plates with melt between them, each time varying the wetting conditions. We then determine the PMF between two grafted silica plates separated by a molten polystyrene film. Allowing the grafting density and the molecular weight of grafted chains to vary between the two plates, we test how asymmetries existing in a real system could affect steric stabilization induced by the grafted chains. Additionally, we derive the PMF between two grafted surfaces in vacuum and determine how the equilibrium distance between the two grafted plates is influenced by their grafting density and the molecular weight of grafted chains. Finally, we provide design rules for the steric stabilization of opposing grafted surfaces (or fine nanoparticles) by taking account of the grafting density, the chain length of the grafted and matrix chains, and the asymmetry among the opposing surfaces.

show abstract

Section: Introductionmentioning

confidence: 99%

Potential of Mean Force between Bare or Grafted Silica/Polystyrene Surfaces from Self-Consistent Field Theory

et al. 2021

View full text Add to dashboard Cite

show abstract

“…High‐temperature water vapor steam was sprayed during the process of friction and on the rubber compound with a traditional mixing to wet mixing ratio of 1:1.65. Due to its volatility, high‐temperature steam was continuously sprayed to keep the mixing rubber surface moist, which would maintain the accuracy of indoor rubber mixing with the analog mixer 18–23 …”

Section: Methodsmentioning

confidence: 99%

“…The second‐stage reaction is an intermolecular concentration reaction between silanes on the silica surface produced by adjacent ethoxy groups that do not react with silanes. The reaction rate of the first stage is very low compared with the second stage 18–21 …”

Section: Silanization Mechanism Of Silicamentioning

confidence: 99%

A comparison of the effects of traditional and wet mixing processes of rubber on metal friction and wear

Han

Zhang

Wang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Prolonged operations of mixers cause wear of mixer rotors and chamber walls and affect the clearances between the rotors and chamber walls, which reduce the mixing effect, weaken the dispersion of the packing, and affect the quality of rubber products. In this study, the effects of traditional mixing and wet mixing on the friction and wear of the chamber, and the properties of rubber were compared by using 60 phr of a silica natural rubber formulation system. The results show that a silanization reaction occurs between silica and the silane coupling agent during the mixing process and that the reaction rate is fastest when the temperature of the mixing chamber is maintained between 145 and 155°C for 1 min during the mixing process. The products of silanization reaction are ethanol and water; the water vapor that forms at high temperatures corrodes the mixing chamber of the internal mixer and aggravates wear and tear. Due to the high dispersion of silica during wet mixing, the silanization reaction is more complete and water vapor is produced at a high temperature. Hence, the rubber compound obtained by wet mixing has more significant wear on the mixing chamber.

show abstract

“…Three are the most exploited protocols for the synthesis of inorganic-polymeric materials: (i) grafting to, (ii) grafting from, and (iii) grafting through whose mechanisms are already fully reviewed [ 71 , 72 ]. RAFT polymerization has been already applied for surface modification of several inorganic compounds, few examples are gold [ 73 ], iron oxide [ 74 ], silica [ 75 ], and titanium dioxide [ 76 ] nanoparticles. For instance, our group [ 77 ] developed TiO 2 @PS nanocomposite in a fashionable controlled way through grafting-from polymerization, but only a little research is available on PET-RAFT.…”

Section: Applicationsmentioning

confidence: 99%

New Light in Polymer Science: Photoinduced Reversible Addition-Fragmentation Chain Transfer Polymerization (PET-RAFT) as Innovative Strategy for the Synthesis of Advanced Materials

Bellotti

Simonutti

2021

Polymers

Self Cite

View full text Add to dashboard Cite

Photochemistry has attracted great interest in the last decades in the field of polymer and material science for the synthesis of innovative materials. The merging of photochemistry and reversible-deactivation radical polymerizations (RDRP) provides good reaction control and can simplify elaborate reaction protocols. These advantages open the doors to multidisciplinary fields going from composite materials to bio-applications. Photoinduced Electron/Energy Transfer Reversible Addition-Fragmentation Chain-Transfer (PET-RAFT) polymerization, proposed for the first time in 2014, presents significant advantages compared to other photochemical techniques in terms of applicability, cost, and sustainability. This review has the aim of providing to the readers the basic knowledge of PET-RAFT polymerization and explores the new possibilities that this innovative technique offers in terms of industrial applications, new materials production, and green conditions.

show abstract

Reinforcement of polychloroprene by grafted silica nanoparticles

Cited by 34 publications

References 40 publications

Potential of Mean Force between Bare or Grafted Silica/Polystyrene Surfaces from Self-Consistent Field Theory

Potential of Mean Force between Bare or Grafted Silica/Polystyrene Surfaces from Self-Consistent Field Theory

A comparison of the effects of traditional and wet mixing processes of rubber on metal friction and wear

New Light in Polymer Science: Photoinduced Reversible Addition-Fragmentation Chain Transfer Polymerization (PET-RAFT) as Innovative Strategy for the Synthesis of Advanced Materials

Contact Info

Product

Resources

About