Study On Unsaturated Polyester Resin Nano-hybrid Materials Synthesized By In-situ Polymerization

Nano-silica and copper nanowire were introduced into the condensation reaction of dibasic acidsbetween dihydric alcohols or into the process of the reaction of copolymerization for cross-linkingmonomers to prepare unsaturated polyester resin (UPR) nano-hybrid materials by in-situ polymerization,respectively. With reactive functional groups, the silicon dioxide could play a role in polymerization ofUPR as a monomer. And nano-SiO2/UPR hybrid materials with different structures were obtained by in-situpolymerization. IR, TEM and TG were adopted to analyze on the bond of nano-silica/unsaturated polyesterresin hybrid materials, mechanical properties and the corrosion resistance behavior of hybrid materialswere evaluated, moreover, and tribological behavior of hybrid materials were analyzed. And the reactionmechanism of the unsaturated polyester resin between the surface chemical functional groups of nano-silicawas preliminary studied. Mechanical properties and tribological behaviors of copper nanowire/UPR hybridmaterials were also discussed in this paper.In this thesis, the work and results were as follows:1. The nanosilica with epoxy group on surface could react with the hydroxyl or carboxyl in unsaturatedpolyester chains, and the nanosilica (RNS-D) with carbon-carbon double bond on surface could react withcarbon-carbon double bond from unsaturated polyester chains or styrene monomer. The above twonano-particles were selected to add in the unsaturated polyester by in-situ polymerization. Different newhybrid materials with excellent mechanical properties could be synthesized by changes structure ofnano-particles between UPR.2. Copper nanowire could be dispersed well in copper nanowire/UPR hybrid materials which wereprepared by in-situ polymerization. Good tribological properties of nano-hybrid materials with wereobtained because of the oxidation stability of copper protected in the reduction of the reaction system.3. The mechanical properties of RNS-E/UPR and RNS-D/UPR hybrid materials were analyzed. Itshowed that different nanoparticles could strengthen and toughen the UPR matrix. When RNS-E wasintroduced into the UPR at a dosage of0.6%, the tensile strength of RNS-E/UPR hybrid materials wasimproved by about30.1%than that of pure UPR, and the impact strength of RNS-E/UPR hybrid materials was about93.8%higher than that of pure UPR. When RNS-D was introduced into UPR matrix at a contentof0.6%, the tensile strength of RNS-D/UPR hybrid materials was increased by about6.35%than that ofneat UPR, while the content of RNS-D was0.4%, and the impact strength of RNS-D/UPR hybrid materialswas about57.8%higher than that of pure UPR. When copper nanowire was introduced into the UPR at adosage of0.4%, the tensile strength of copper nanowire/UPR hybrid materials was stronger by29.05%than that of pure UPR, and the impact strength of RNS-E/UPR hybrid materials was about44.88%higherthan that of pure UPR.4. The tribological behavior of pure UPR, RNS-E/UPR, RNS-D/UPR and copper nanowire/UPR hybridmaterials was evaluated. It had been found that the friction coefficient and the wear lost of hybrid materialsdecreased with the content of nanoparticles (≤0.6%) increasing, whlie the friction coefficient and the wearlost of hybrid materials increased with nanoparticles the content of (>0.6%) increasing. Moreover, thefriction coefficient of hybrid materials was decreased and the wear lost in moderately creased when theloading force was increased.5. The water absorbing capacity and acid and alkali resistant of pure UPR and RNS-E/unsaturatedpolyester resin hybrid materials were analyzed.The results showed that the water absorption of hybridmaterials decreased with the content of RNS-E (≤0.8%) increasing, and resisting alkali properties of hybridmaterials can be improved accordingly, but the influence on resisting acid properties of hybrid materialscan hardly be not improved.