Preparation and characterization of Si3N4/SBR nanocomposites with high performance

Tai, Yanlong; Qian, Jiasheng; Miao, Jibin; Xia, Ru; Zhang, Yuchuan; Yang, Zhen‐Guo

doi:10.1016/j.matdes.2011.05.002

Cited by 34 publications

(35 citation statements)

References 31 publications

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“…Therefore, we suggest that the behaviour of T g is predominantly governed by the stoichiometric effect of the nanofiller. Since the surface of Si 3 N 4 is primarily covered by amine groups [7][8][9], its presence would be expected to increase the effective amine content and, thus, result in an effective HP that is higher than the nominal HP. Indeed, as shown in Fig.…”

Section: Glass Transition Temperaturementioning

confidence: 99%

“…More interestingly, the surface chemistry of Si 3 N 4 is characterized by the existence of amine and, to a lesser extent, hydroxyl groups [7][8][9]. Both of these groups, particularly the amine groups, can react with the epoxy groups in the resin matrix; while the hydroxyl groups usually react only at higher temperatures ([ 120°C), they can, nevertheless, act to catalyse amine/epoxy reactions [10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites

et al. 2017

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The addition of nanofillers can have a significant influence on the resin stoichiometry of thermosetting polymer systems. Based on differential scanning calorimetry (DSC) results, it is estimated that the inclusion of 2 and 5 wt% of silicon nitride nanofiller displaces the resin/hardener stoichiometry of an epoxy/amine network by 6.5 and 18%, respectively. Dielectric spectroscopy results confirm the above findings, in that the spectra of the nanocomposite samples were found to be equivalent to the spectra of unfilled samples when the above stoichiometric effect was taken into account. Therefore, this study provides clear evidence that the presence of a nanofiller can directly and significantly affect the curing process of an epoxy network. Consequently, this should always be considered when introducing nanofillers into thermosetting matrices. These results indicate the presence of covalent bonding between the nanoparticles and the surrounding polymer and, therefore, provide an opportunity to explore the influence of this bonding on the molecular dynamics of the polymer layer around the particles. However, the obtained DSC and dielectric spectroscopy results suggest that, in the system considered here, either the covalent bonding does not have an appreciable influence on the segmental dynamics of the polymer, as revealed by these techniques, or that the thickness of the affected layer is less than 1 nm and therefore too small to be distinguished from experimental uncertainties.

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Section: Glass Transition Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites

et al. 2017

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“…It is attributed to the grafted VTES content will cause more chemical interaction between polar silica and SBR chains, consequently, when TEOS was added during the graft copolymerization, the silica formed by the hydrolysis and condensation of TEOS in the SBR-g-VTES latex may be chemical bond onto the SBR-g-VTES chains, therefore, when the coagulated silica has been added into this in situ TEOS reinforced SBR-g-VTES latex, the coagulated silica may be most likely to be chemical bond onto the modified SBR chains. As a result, with the increasing content of TEOS, more and more coagulated silica will be chemical bond onto the SBR molecular chains, and this silica will cause the SBR chains more and more rigidity to improve the young's modulus and stress significantly [27,29].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…9b and d). Tai [29] reported that the lower the tan d value is, the less the mechanical losses are. These losses are related to the energy input required for the motion of the polymer chains as the transition is being approached.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Preparation, properties of In‐situ silica modified styrene‐butadiene rubber and its silica‐filled composites

et al. 2016

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In this work, native emulsion polymerization styrene butadiene rubber (SBR) were first grafted by vinyltriethoxysilane (VTES) to SBR-g-VTES (VTES grafted SBR), second, the SBR-g-VTES were modified by different amount of TEOS (tetraethoxysilane) using in situ sol-gel method, at the last, the extra silica was added into the in situ modified SBR system to get the modified SBR/ silica composites using latex coagulation technology. The effect of different amount of TEOS on modified SBR/silica composites was also systematically studied, including the content of silica and utilization of silica, cure characteristics, physical mechanical properties and dynamic mechanical properties. The surface properties of modified SBR/silica composites were characterized by scanning electron microscope (SEM). It can be got that the grafting of VTES and in situ hydrolysis and condensation of TEOS can effectively inhibit the agglomeration and improve the mechanical properties of modified SBR/silica. It also can be found that modified SBR brings well physical and dynamic mechanical properties, wear resistance, and low rolling resistance to SBR, especially, when the TEOS is 3.0 g, the best overall performance of modified SBR/silica can be achieved. POLYM. COMPOS., 39:22-28, 2018. V C 2016 Society of Plastics Engineers INTRODUCTIONSynthetic rubbers are now commonly used in pneumatic tires. Tires must have a lot of requirements, especially for sufficient grip on the road, transmit steering forces to guide the vehicle and have as low as possible impact on fuel consumption [1]. According to investigation statistics, in the process of vehicle driving, the rolling resistance of tire is 20-30% of the total energy consumption of automobile. Furthermore, the rolling loss of tread is about 50% of the total energy consumption of tire [2].In the prevailing paper, carbon black (CB) and silica have been used as the main reinforcing fillers to resolve these problems that increase the usefulness of rubbers in tire [3,4].As discussed previously, silica can yield a lower rolling resistance at equal wear resistance and wet grip than CB. However, nano silica has a number of hydroxyl groups (silanol, Si-OH), which results in strong filler-filler interactions and adsorption of polar materials by hydrogen bonds [5]. The effective way is to use a coupling agent to modify the surface of silica, which can increase the filler-rubber interaction and improve silica dispersion in the composites, whereas, this method has two shortcomings, the first is that it is difficult to ensure each silica particle is organically modified by the molecules of silane coupling agent, the second is that the chemical bonding between rubber and silica cannot actually work quite right. As a result, researchers reported that in order to lower the rolling loss and higher wet resistance, introducing the functional groups which can either "passivate" free terminals or react with reinforcing filler into the macromolecular chains becomes a research focus in recent years [2].Up to now, there ...

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“…However, inorganic nano-particles are very prone to agglomerate in media and show poor dispersion capacity in organic solvents and oil due to their high surface energy. Because of the inconsistent interfacial interaction, the combination of the inorganic nano-particles with the polymer matrix is weak, which limits the wide application of nano-particles [1][2][3]. How to disperse the inorganic nano-particles in organic polymer matrices and improve their interfacial interaction are the main issues to be solved.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of nano-TiN by using silane coupling agent

Cheng¹,

Luo

Qian

et al. 2014

Materials Science-Poland

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Titanium nitride (TiN) nano-particles were subjected to graft modification by silane coupling agent (KH-570) via a direct blending method. The hydroxyl groups on the surface of TiN nano-particles can interact with silanol groups [-Si-OCH 3 ] of KH-570 forming an organic coating layer. The covalent bonds (Ti-O-Si) formation was testified by Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). Through transmission electron micrograph (TEM) observations, it was found that KH-570 could improve the dispersibility of nano-TiN particles in ethyl acetate. Thermo gravimetric analysis (TGA) and contact angle measurements indicated that KH-570 molecules were adsorbed or anchored on the surface of nano-TiN particle and the net efficiency of it was 22.76 %, which facilitated to hinder the aggregation of nano-TiN particles.

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Preparation and characterization of Si3N4/SBR nanocomposites with high performance

Cited by 34 publications

References 31 publications

Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites

Influence of filler/matrix interactions on resin/hardener stoichiometry, molecular dynamics, and particle dispersion of silicon nitride/epoxy nanocomposites

Preparation, properties of In‐situ silica modified styrene‐butadiene rubber and its silica‐filled composites

Surface modification of nano-TiN by using silane coupling agent

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