Isopropyl Tri Research Articles

Reinforcing interfacial compatibility of LLZTO/PVDF-HFP composite electrolytes by chemical interaction for solid-state lithium metal batteries

Composite electrolytes (CEs) have a significant potential for achieving excellent safety and energy density in solid-state lithium metal batteries owing to applicable ionic conductivity, easy fabrication, and good electrochemical properties. However, achieving good interfacial compatibility between inorganic fillers and polymer matrix remains challenging. Herein, we design a Li6.4La3Zr1.4Ta0.6O12 filler modified with isopropyl tri(dioctyl pyrophosphate) titanate for poly (vinylidene fluoride-co-hexafluoropropylene) electrolyte (denoted as Ti@LLZTO/PVDF-HFP). We reveal the enhanced mechanism of a modified interface on the electrochemical performance by combining experimental results and theoretical calculations. The reinforced interface can facilitate the uniform dispersion of filler in the polymer matrix as well as dissociate more lithium salt, which enables enhanced ionic conductivity (6.86 × 10−5 S cm−1 at 30 °C). Besides, the Ti@LLZTO can immobilize the anions in lithium salt via hydrogen bonding interactions and the Ti–O chemical bonding. Consequently, the Li||Ti@LLZTO/PVDF-HFP||Li cell shows great cyclability over 1550 h at 0.1 mA cm−2, 0.1 mAh cm−2. Moreover, the Li||Ti@LLZTO/PVDF-HFP||LFP cell achieves superior cycling stability at 0.5 C with a high Coulombic efficiency of 98.8 %. This work provides an insightful understanding of designing good interfacial compatibility for advanced composite electrolytes.

Flexible and thermally conductive epoxy‐dispersed liquid crystal composites filled with functionalized boron nitride nanosheets

AbstractIn view of the problem of heat accumulation in electronic devices, the development of new composites with high thermal conductivity (TC) is the current research focus. Nowadays, improving TC often lead to inevitable deterioration of the mechanical properties of materials. In this work, the E‐functionalized boron nitride nanosheets (f‐BNNS)/liquid crystal monomer (LCM)/Epoxy‐thiol films with high TC were prepared by using flexible epoxy‐thiol polymer as matrix and LCM and f‐BNNS as thermal fillers via high voltage orientation molding. The epoxy‐thiol polymer possessed high intrinsic TC due to the regular arrangement of molecular chains and the f‐BNNS showed favorable dispersibility because of the modification by isopropyl tri(dioctylpyrophosphate) titanate (ITDPT). The results show that TC of E‐f‐BNNS/LCM/Epoxy‐thiol films with 30 wt% f‐BNNS content achieves 1.65 W/m·K and is 511.11% higher than that of pure epoxy‐thiol polymer (0.27 W/m·K). The tensile strength and elongation at break increase to 24.9 MPa and 47.41%, respectively. The favorable results are attributed to the ordered arrangement of f‐BNNS and molecular chains, resulting from the hydrogen‐bonding interaction between OH group in f‐BNNS, LCM and epoxy‐thiol polymer. This research provides a simple and feasible method for preparing flexible epoxy polymer films with high TC.Highlights The functional BNNS was achieved by isopropyl tri(dioctylpyrophosphate) titanate. Effects of matrix thermal conductivity on films thermal conductivity are probed. High voltage orientation molding are used for preparing epoxy composite films. The films demonstrate excellent thermal conductivity and favorable tensile strength.

Curing Behavior of UV-Initiated Surface-Modified Nano-TiO2/Epoxy Resin Prepolymers and the Properties of Cured Composites.

Nano-titanium dioxides (nano-TiO2) surface modified with isopropyl tri(dioctylpyrophosphate) titanate (NDZ-201), a titanate coupling agent, and 3-glycidoxypropyltrimethoxysilane (KH-560), a silane coupling agent, were separately mixed with bisphenol A epoxy resin (DEGBA) prepolymer and then cured using a UV-normal temperature synergistic curing process. Then, the isothermal curing process of the system was investigated by differential scanning calorimetry (DSC). The relationship between the organization structures, mechanical properties, and heat resistance properties of the cured composites and material formulation was studied, and the DSC results showed that the addition of nano-TiO2 reduced the curing reaction rate constant k1 and increased the k2 of the prepolymer, while the activation energy of the curing reaction after UV irradiation Ea1 decreased, and the activation energy in the middle and later periods Ea2 increased. The characterization results of the composite material showed that nano-TiO2 as a scattering agent reduced the photoinitiation efficiency of UV light, and due to its obvious agglomeration tendency in the epoxy resin, the mechanical properties of the composite material were poor. The dispersibility of the coupling-agent-modified nano-TiO2 in the epoxy resin was greatly enhanced, and the mechanical and heat resistance properties of the composite material improved remarkably. The comparison results of the two coupling agents showed that NDZ-201 had better performance in increasing the impact strength by 6.8% (minimum value, the same below) and the maximum thermal decomposition rate temperature by 4.88 °C of the composite, while KH-560 improved the tensile strength by 7.3% and the glass transition temperature (Tg) by 3.34 °C of the composite.

Characteristics of organic titanate modified titanium dioxide nanoparticles and its dispersibility in acrylic emulsion coating

AbstractThis work presents the characteristics of rutile TiO2 nanoparticles modified by isopropyl tri[di(octyl) phosphato] titanate (KR‐12) with the content of 3, 5 and 10 wt.% as compared to TiO2 nanoparticles weight. The infrared (IR) spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), and thermal gravimetry analysis (TGA) methods were used to evaluate the surface modification efficiency of the TiO2 nanoparticles with KR‐12. The TGA and IR analysis results indicated that the organic coupling agent (KR‐12) was grafted to the surface of the nanoparticles. The TiO2 nanoparticles after modification could disperse stably in water easily. The modification caused the shift of surface charge of the TiO2 nanoparticles to more positive region. The average particle size of TiO2 nanoparticles modified with 0, 3, 5, and 10 wt.% of KR‐12 was 443.9 nm, 295.3 nm, 334.8 nm, and 392.3 nm, respectively. The hydrophobic ability of TiO2 nanoparticles was improved significantly after modification. The modified TiO2 nanoparticles could well disperse in acrylic emulsion coating with dispersed phase size of 200‐400 nm.

Preparation of flame-retardant HDPE composites with synergistic strategy by the combination of phosphorus-containing modifier and magnesium oxychloride cement

Magnesium oxychloride cement (MOC), as an inorganic gel material with 5Mg(OH)2·MgCl2·8H2O as its main component, has higher heat absorption and water yield during thermal decomposition than that of magnesium hydroxide (MH). It can also be used in flame-retardant polymer materials like MH. The flame retardancy of HDPE/MOC composites increases with the addition of MOC. Compared with pure HDPE, when the MOC filling amount is 60 wt%, the total heat release and total smoke production decrease by 50.6% and 50.8% respectively, and the total heat release per mass for HDPE decreases from 53 kJ/g to 32.2 kJ/g. Phosphoric acid (PA) shows a good synergistic flame-retardant effect with MOC while improving the water resistance of MOC. After adding 1 wt% PA, the peak heat release rate and peak smoke production rate of HDPE/MOC/PA (50/49/1) decrease by 30% and 25.6% respectively, and the fire growth index (FGI) decreases by 24.6%. Phosphorus-containing coupling agent (isopropyl tri(dioctylpyrophosphate) titanate) can improve the size distribution of MOC, and also has synergistic flame-retardant effect with MOC in HDPE/MOC composites.

Effects of different interfacial modifiers on the properties of digital printing waste paper fiber/nanocrystalline cellulose/poly(lactic acid) composites

AbstractDigital printing waste paper fiber/nanocrystalline cellulose/poly(lactic acid) composites, modified through γ‐methacryloxy propyl trimethoxy silane (KH570), isopropyl tri(dioctylpyrophosphate) titanate, sodium hydroxide, polyethylene glycol 6000 (PEG6000), and a composite silane coupling agent (KH570/PEG6000), were fabricated by melt blending and injection molding, and the effects of different modifiers on the properties of composites were studied. The results show that the mechanical properties of the modified composites were improved, and the best flexural strength, tensile strength, and impact strength were obtained by PEG6000, KH570/PEG6000, and KH570, respectively. Thermogravimetric analysis showed that the thermal decomposition performance of the composites treated by KH570 was relatively superior. Differential scanning calorimetry analysis demonstrated that the melting enthalpy and crystallinity of the modified material increased, while the cold crystallization temperature decreased. After modification, both water absorption and degradation showed a decreasing trend, especially KH570/PEG6000. Under the action of several modifiers, the diffusion coefficient, thermodynamic solubility, and permeability of composites were reduced to varying degrees. Furthermore, scanning electron microscopy demonstrated that interfacial adhesion and composite compatibility were improved with significantly fewer and smaller pores, as well as a fuzzy boundary among the three phases.

Impact of titanate coupling agent on properties of high density polyethylene composite filled with coal gangue

In this study, surface modification of coal gangue (CG) was performed with titanate coupling agent 201 (isopropyl tri(dioctylpyrophosphate) titanate), and the effects of surface modifier on mechanical properties and thermal stability of high‐density polyethylene filled with CG (HDPE/CG) and high‐density polyethylene filled with modified CG (HDPE/mCG) composites were investigated. The coupling agent was successfully grafted on CG surface through chemical reaction according to the analyses of Fourier transform infrared spectroscopy (FT‐IR) and X‐ray photoelectron spectroscopy (XPS), and the coupling agent can effectively enhance the hydrophobicity of surface that was verified by water contact angle beyond 90° of modified CG sample. With the introduction of coupling agent, some enhancements of tensile strength, flexural strength, and impact strength were observed in HDPE/mCG compared with HDPE/CG, due to the improved compatibility between mCG fillers and matrix. The increased storage modulus and decreased loss factor of HDPE/mCG composite further confirm the stronger interface adhesion after modification. Moreover, it is found that titanate coupling agent 201 can improve the thermal stability of HDPE/mCG composite to some extent.

Interface interaction and compatibility molecular dynamics verification of Scutellaria baicalensis Georgi extracts/PBS dyeing and antibacterial composites

Scutellaria baicalensis Georgi extracts (SBGE) have the dyeing and antibacterial component and could provide poly(butylene succinate) (PBS) functionality. Isopropyl tri (dioctylpyrophosphate) titanate (NDZ-201) was used to improve the compatibility of the two-phases by utilizing Ti–O–C bonds to obtain SBGE+N/PBS bifunctional composites. The results indicated that the mixing energy (Emix) and Huggins parameters (χ) of the SBGE+N/PBS composites were close to 0, and the cohesive energy density and solubility parameter (δ) were larger than those associated with SBGE/PBS composites. When the NDZ-201 reached 2.0%, the thermal performance of the composite exceeded that of PBS, and the mechanical properties reached theirmaximum value. With an increase in the amount of NDZ-201, the degradation and antibacterial rate increased.

Enhanced Electrochemical Performance of Li4Ti5O12 Anode for Lithium Ion Batteries with Titanate Coupling Reagent As Electrolyte Additive

With the increasing applications of lithium ion batteries in energy storage, electric vehicles and hybrid electric vehicles, it’s required to improve the energy density, safety, rate capability and cycling stability of the batteries. Spinel Li4Ti5O12 is a promising anode material for lithium-ion batteries which possesses good Li+ insertion and de-insertion reversibility with negligible structure change, high safety and rate capability, excellent cycle stability1-2. While the theoretical capacity of it, 175 mAh g-1, is slightly low. Meanwhile, it’s observed gassing during storage or cycling3, limitting its application.It was found that the surface coating could be an effective method to solve the swelling problem and be beneficial to the electrochemical performance4. In this paper, we investigated the effect of titanate coupling reagent TCA-K38S as electrolyte additive on the performance of Li4Ti5O12. TCA-K38S, isopropyl tri-(dioctylpyrophosphate) titanate, is a liquid monoalkoxy pyrophosphate titanate, usually used as coupling agent not only finorganic fillers with resins, but also fnon-polar materials with polar materials, the structural formula is shown in Fig.1. The electrolyte used in this work are 1.2 mol LiPF6 in EC/ EMC solvents ((3:7 by volume), the TCA-K38S was added at 1wt.% and 3 wt.% to the electrolyte solution. Fig.2 shows the cycling performance of Li4Ti5O12 batteries with different amounts of the TCA-K38S additive at various rates. It can be seen that the specific capacity of batteries with 1wt.% additive is 180 mAh g-1 at the first discharge and stable in 170mAh g-1 at 0.2 C, comparied to 162mAh g-1 and 158mAh g-1 at 0.2 C when it’s without additives. Acknowledgements The project was supported by the National High Technology Research and Development Program of China (863) (2013AA050902) and Shanghai Science and Technology Development Fund (15DZ2282000, 14JC1491800) .

Preparation of UV-curing polymer-ZrO2 hybrid nanocomposites via auto-hydrolysis sol-gel process using zirconium oxychloride octahydrate coordinated with organic amine

The precursor zirconium oxychloride octahydrate (ZrOCl2·8H2O) was firstly used to prepare clear and transparent zirconia sol via an auto-hydrolysis sol-gel method without the water. Triethylamine (TEA) and dimethylaminoethyl methacrylate (DMAM) were used as acid binding agents to control the pH value in the sol-gel process. Silane coupling agent, acetylacetone (acac) and isopropyl tri(dioctyl)pyrophosphato titanate (titanate coupling agent, NDZ-201) were utilized to protect the zirconia nanoparticles and improve the interaction between the organic network and inorganic component in UV-curing hybrid coatings. The hydrolysis and condensation processes were monitored by FT-IR. The particle size and distribution of zirconia sol with different coupling agents were evaluated by the transmission electron microscopy (TEM). The Scanning electron microscopy (SEM) indicated that the particle size was smaller and had a more uniformity dispersion when NDZ-201 was used. An organic/inorganic interpenetrating network (IPN), which was based on polyacrylate and zirconia nanoparticles, was probably formed by the proper ratio of acrylates to zirconia sol during the UV-curing process. Thermal Mechanical Analysis (TMA) results showed that the IPN structure had a higher Tg. Notably, the hardness and flexibility of the UV-curing hybrid coatings were simultaneously improved compared with the UV-curing pure organic polymer.

Effect of CaCO3 contents on the properties of polyethylene nanocomposites sheets

Nanocomposites of high-density polyethylene/linear low-density polyethylene (HDPE/LLDPE) filled with untreated and surface treated nano-calcium carbonate (nCC) were prepared. The influence of isopropyl tri-(dioctylpyrophosphato) titanate (JN114) treatment of nCC on the morphology, mechanical, crystallization and flow properties of the nanocomposites were studied. The results of scanning electron microscopy (SEM) showed that JN114 treated nCC was better dispersion in the matrix than the untreated one. A fine dispersion of the treated nanoparticles in the nanocomposites was observed by transmission electron microscopy (TEM). The FTIR spectrum analysis revealed that the JN114 could change the surface properties of nCC, resulting in greater hydrophobicity of the surface and enhanced compatibility with nonpolar matrices. The tensile elastic modulus (E c ) and Izod impact strength (SIC) of nanocomposites increased with the increasing of nCC content while tensile fracture strength (σ b ) decreased. The JN114 treated nanocomposites had superior mechanical properties to those of the untreated ones. The compatibility of these nanocomposites was examined by DSC to estimate melting point (T m ) and crystallization temperature (T c ). Furthermore, the melt flow index (MFI) of the nanocomposite materials were measured. It was found that the MFI decreased with the addition of weight fraction of the nCC particles.

Effects of a titanate coupling agent on the mechanical and thermo‐physical properties of talc‐reinforced polyethylene compounds

ABSTRACTAn experimental study was carried out to investigate the effects of a titanate coupling agent on the mechanical properties, moisture absorption, and thermal conductivity of talc‐filled high‐density polyethylene (HDPE). Talc (0–35 wt %) was used as reinforcement particulate filler in an HDPE matrix and samples were prepared in a micro‐compounder and an injection molding machine. Isopropyl tri(dioctyl)phosphate titanate (0.5 wt %) was used as coupling agent. Composites with and without coupling agent were evaluated for changes in mechanical and thermo‐physical properties, morphology, and void content. Addition of the titanate coupling agent most often resulted in an increase in stiffness and tensile strength. Furthermore, both the void content and the elongation at break of composites were reduced. Results also showed that the coupling agent had no effects on the thermal conductivity, thermal diffusivity, and specific heat capacity of the composites. In addition, it was observed that the coupling agent was more effective at low concentrations of filler. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40449.

Study on Structure and Properties of Degradable Polymer/Modified Nano-Si0<sub>2</sub> Composites

By using Isopropyl tri (dioctylpyrophosphate) titanate modified nanoSi02. Poly (ε-caprolactone)(PCL) and Poly (Butylene Succinate Adipate)(PBSA) blends was prepared by melt mixing. Its structure and mechanical properties were studied respectively with infrared spectrometer (FT-IR), universal material testing machine and scanning electron microscope (SEM),and analysis the degradation behavior by soil buried experiment The results showed that the modified nanoSi02 content is 4%, the mechanical properties of composite degradation material is improved obviously. The SEM results showed that a low amount of modified nanoSi02 can be dispersed evenly in the blends, while agglomeration of was observed in blends with increasing modified nanoSi02 content. Compared with SEM image after degradation, the degradation behavior of the composites was good.

Feasibility and properties of polypropylene composites reinforced with down feather whisker

Polypropylene (PP) composites reinforced with down feather whisker (DFW) with and without surface modification were prepared and characterized through a series of tensile tests. The reaction of isopropyl tri(dioctylpyrophosphate) titanate (NDZ-201) on the surface of DFW was investigated to improve the compatibility between PP and DFW. The chemical reaction between DFW and NDZ-201 was characterized using the attenuated total reflection attachment on the Fourier transform infrared spectroscopy. PP/modified DFW (MDFW) composites showed more uniform whisker dispersion in the PP matrix, higher compatibility and good tensile strength than pure PP and PP/DFW composites. It was worth noting that the Young’s modulus of PP/DFW composites was higher than that of pure PP but lower than that of PP/MDFW composites. Furthermore, the effects of DFW and MDFW on the microstructural and thermal properties of different composites were also investigated, respectively. These results indicated that DFW could be a potential natural reinforcement for the PP matrix achieved with the use of NDZ-201.

Comparison of effect of surface-modified micro-/nano-mineral fillers filling in the polypropylene matrix

Effect of unmodified and surface-modified micro-/nano-calcium carbonate particles on the mechanical properties, crystallization behavior, and thermal properties of polypropylene (PP)/microscale calcium carbonate (micro-CaCO3 (mCC)) and PP/nanoscale calcium carbonate (nano-CaCO3 (nCC)) composites has been comparatively investigated via melt mixing. Mechanical tests indicated that PP/nCC composite with the addition of 5–10 wt% nCC is higher than that of virgin PP and even higher than that of PP/mCC composite with the addition of 5–15 wt% mCC. In addition, incorporation of titanate-coupling agent (isopropyl tri-(dioctylpyrophosphato) titanate (JN114)) further increased the mechanical properties of the composites. This improvement in the mechanical properties was evidenced by scanning electron microscopy. The addition of small amounts of JN114 into PP/mCC and PP/nCC induces the great change in crystallization behavior of PP matrix. Improved distribution of CaCO3, enhanced crystallization temperature, largely increased the degree of crystallinity, Xc (%), and the heat deformation temperature are achieved for PP/modified-nCC samples.

Effect of coupling agents on the thermal conductivity of aluminum particle/epoxy resin composites

In this study, four kinds of coupling agents (CA), i.e., γ-aminopropyltriethoxysilane (KH-550), (3-glycidyloxypropyl)trimethoxysilane (KH-560), isopropyl tri(di(2-ethylhexyl)pyrophosphate)titanate (NDZ-201), isopropyl tri(di(2-ethylhexyl)phosphate)titanate (NDZ-102), were used to investigate their influences on the thermal conductivity and morphology of aluminum (Al) particle reinforced epoxy composite. The results indicate that the thermal conductivity of the composites increases with increasing Al particles concentration up to 48 vol.%; the surface modification of Al particles has an appreciable effect on the thermal conductivity. The thermal conductivities of the composite containing 48 vol.% Al particles treated with the KH-550, KH-560, NDZ-201, and NDZ-102 couplers, are 1.29, 1.48, 1.27, and 1.36 W/m K, respectively, corresponding to 1.03 W/m K of that without surface treatment. Furthermore, the concentration of CA has an influence on the thermal conductivity of the composites.

Incorporation of nano-sized mesoporous MCM-41 material used as fillers in natural rubber composite

The nano-sized mesoporous MCM-41 (without template), and the modification of MCM-41 (without template) were used to prepare natural rubber (NR) composites. The effects of coupling agents γ-aminopropyltriethoxysilane (KH-550), γ-methacryloxypropyltrimethoxysilane (KH-570), bis-(γ-triethoxysilylpropyl)-tetrasulfide (Si-69), isopropyl tri-(dioctylpyrophosphate)titanate (NDZ-201) on the mechanical properties of the composites were also investigated. The results showed that the tensile properties of Natural rubber/mesoporous MCM-41 nanocomposite were improved as compared with those of NR compound. KH-570 had good effect on enhancing the overall properties of the composites. Scanning electron microscopy (SEM) observations revealed that the modified nano-sized MCM-41 material was well dispersed in the polymer matrix and the enhancement of the interface between the matrix and fillers was obtained.

Effect of Surface Structure of Nano-CaCO3 Particles on Mechanical and Rheological Properties of PVC Composites

To study the effect of different surface structures on resultant mechanical and rheological properties, nano-CaCO3 particles were treated with isopropyl tri-stearyl titanate (H928), isopropyl tri-(dodecylbenz-enesulfonyl) titanate (JN198), and isopropyl tri-(dioctylpyrophosphato) titanate (JN114). Scanning electron microscopy (SEM) and dynamic mechanic analysis (DMA), carried out to characterize the effective interfacial interaction between the nano-CaCO3 particles and a poly(vinyl chloride) (PVC) matrix, indicated that JN114 treated nano-CaCO3 particles had the strongest interfacial interaction with a PVC matrix, while H928 treated nano-CaCO3 had the weakest. The rheological and mechanical properties of PVC/nano-CaCO3 composites were investigated as a function of surface structure and filler volume fraction. The tensile yield stress and elongation at break decreased with the increasing of calcium carbonate content while tensile modulus increased. PVC filled with JN114 treated nano-CaCO3 had the highest tensile modulus and tensile yield stress, while those filled with H928 treated nano-CaCO3 had the highest elongation at break at the same filler content. The impact strength of PVC/nano-CaCO3 composites increased with the increasing of CaCO3 content, and PVC composites filled with JN198 treated nano-CaCO3 particle had a higher impact strength than those with JN114 or H928 treated, with the value reaching 23.9 ± 0.7 kJ/m2 at 11 vol% CaCO3, four times as high as that of pure PVC. Rheological properties indicated that a suitable interfacial interaction and a good dispersion of inorganic filler in a PVC matrix could reduce the viscosity of PVC/nano-CaCO3 composites. The interfacial interaction was quantitatively characterized by semiempirical parameters calculated from the tensile strength of PVC/nano-CaCO3 composites to confirm the results from the SEM and DMA experiments.

Incorporation of modified soy protein isolate as filier in BR/SBR blends

The surface modification of soy protein isolate (SPI) and the use of modified SPI as reinforcing filler replaced carbon black in BR/SBR composites were studied. The effects of coupling agents γ-aminopropyltriethoxysilane (KH-550), γ-methacryloxypropyltrimethoxysilane (KH-570), bis-(γ-triethoxysilylpropyl)-tetrasulfide (Si-69), isopropyl tri-(dioctylpyrophosphate) titanate (NDZ-201) on the physical and mechanical properties of the composites were also investigated. Modified SPI was analyzed by Infrared spectra, scanning electron microscopy, and X-ray diffraction. The results showed that the optimal reaction conditions were determined, that is, the optimal reactions were 4 g SPI, 50% Glycidyl methacrylate (by SPI weight), 3 h of reaction time and 80 °C reaction temperature. Through the physical and mechanical properties of composite, the results showed that when a small number of modified SPI (3–5 phr) as reinforcement agent was used, the mechanical properties were improved. KH-550 had good effect on enhancing the overall properties of the composites.

Comparison of cure, mechanical, electric properties of EPDM filled with Sm 2O 3 treated by different coupling agents

Composites based on ethylene–propylene–diene rubber (EPDM) were prepared. EPDM was reinforced with 100 phr Sm 2O 3 treated with coupling agents: stearic acid (SA), isopropyl tri(dioctylphosphate) titanate (NDZ102), bis-[-3-(triethoxysilyl)propyl]tetrasulfide (KH845-4), and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane (SG-Si602), respectively. Cure, mechanical and electrical properties of the composites were investigated. It was found that carboxyl in coupling agents could retard EPDM cure while amino groups, P O bonds and S atoms could accelerate EPDM cure. Amino groups enhanced composite mechanical properties by forming additional rigid C–C linkages, whilst S atoms boosted composite mechanical properties by generating flexible S–C linkages. P O bonds might be subject to cleavage during vulcanization and form flexible P–C linkage. Thus, composites with NDZ102 and KH845-4 treated filler exhibited better mechanical properties than that with SG-Si602 treated filler. In addition, treatment of filler could reduce composite electrical properties due to interfacial improvement.