Synthesis of organic‐inorganic hybrid nanocomposites based on the acrylate monomers and investigation of scratch resistance of these nanocomposites

Abstract

Organic‐inorganic hybrid nanocomposites can be used as polymer coatings in order to improve their scratch resistance. These nanocomposites consist of a polymer matrix that provides flexibility and lightweight, and inorganic nanoparticles that are responsible for high thermal stability and improving scratch resistance. In this study, the polymer matrix, methyl methacrylate‐butyl acrylate (MMA‐BA) copolymer, was synthesized by conventional emulsion polymerization. To get the highest conversion percentage of the copolymer, various parameters, including reaction temperature, weight ratio of monomers, mechanical stirrer speed, type and amount of initiator, total amounts, and weight ratio of emulsifiers were investigated. For the synthesis of nanocomposites, nanoparticles of titanium dioxide, iron oxide, silver sulfide, and modified and unmodified nanosilica were added to the copolymer with the highest conversion percentage. According to the data, the best conditions for the synthesis of a copolymer with the highest conversion percentage were as follows: weight ratio of MMA:BA = 60:40 with a total amount of 10 g monomers, mechanical stirrer speed of 250 rpm, thermal initiator water‐soluble ammonium persulfate with amount of 0.12 g, emulsifiers such as sodium dodecyl sulfate and Triton X‐100 with a weight ratio of 1:3 and a total value of 1 g, and the reaction temperature of 80°C. According to the results of thermal gravimetric analysis, the samples with the highest thermal stability were selected for nanoscratch test. Nanoscratch test results suggested that Ag2S nanocomposite including 0.03 g AgNO3 and 0.0072 g thiourea had the highest scratch resistance with the lowest coefficient friction (0.48) and the lowest coefficient scratch (0.113 μN–1/2). Chemical structures of synthesized compounds were confirmed by Fourier transform infrared spectroscopy. The morphology of synthesized Ag2S nanocomposite was investigated by scanning electron microscopy and energy dispersive X‐ray spectroscopy analyses.

A review of solid lubrication based on polyurethane composites

“…The preparations of inorganic–organic composites have always attracted a lot of attention so far. Many pioneers have offered various combined methods upon inorganic fillers and organic polymers to gain excellent properties [ 92 ] In the pursuit of optimum lubricating properties, researchers have tried to add inorganic lubricants (e.g., GO, CFs, MoS 2 , nano‐SiC, nano‐ZrO 2 , and nano‐SiO 2 ) and organic lubricants (e.g., PTFE, PFW and caged polyhedral oligomeric sesquisiloxane [POSS]) together for modifying the PU matrix to achieve excellent lubrication performances by synergistic effect.…”

Synthesis of Polyurethane/TiO2 Hybrid with High Encapsulation Efficiency Using One‐Step Miniemulsion Polymerization for Methylene Blue Degradation and its Antibacterial Applications

“…The integration of inorganic NPs into a polymer matrix allows the properties of both inorganic NPs and polymers to be combined/enhanced with high performance, which can lead to many industrial and even photocatalytic applications. [5,[7][8][13][14][15][16] The functionalization of hybrid inorganic colloidal particles has become an inherent part of the developing research on the surface modification, structure interface, and bonding mechanism of hybrid colloidals. [8,[17][18] Therefore, it is not surprising that the encapsulation of NPs was found to play a key role in this.…”

“…Encapsulation technology has led to the development of several processes for the preparation of inorganic NPs with well-defined structures. A variety of synthetic approaches, typically using heterophase polymerization methods, have been employed to create hybrid polymers in colloid systems, such as miniemulsions, [8,[17][18][19] emulsions, [13] and dispersion polymerization. [20][21] Generally, the hybrid particle structure consists of a heterogeneous distribution of inorganic and organic NPs in a polymer matrix of different natures.…”