JOURNAL OF RHEOLOGY
·
2021
·Vol. 65
·期 5
·807-820
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IF 4.408
Song Yihu,Xu Zhongjia,Wang Wanjie,Zheng Qiang
Rubber nanocomposites experiencing dynamic shears at large strain amplitudes ( γ ) exhibit the nonlinear Payne effect featured by decays of storage and loss moduli ( G′ and G″ ) or by G′ decay accompanied with G″ overshoot near a critical strain amplitude. The occurrence of the Payne effect has been assigned to damages of “filler network” and rubber-filler interfacial interactions for a long time and to Rouse dynamics of rubber chains recently. To solve the dispute, influences of extraction, crosslinking, and paraffin swelling on the Payne effect of carbon black filled natural rubber nanocomposites are investigated systematically. Master curves of G′ as a function of γ could be always created, and overshoot of G″ in the filled vulcanizates weakens with increasing filler content and intensifies by dilution via paraffin swelling, suggesting that the Payne effect is not mainly rooted in the “filler network” and rubber-filler interfacial interactions. The filler reduces the onset strain amplitude of the Payne effect by amplifying microscopic strain amplitude of the rubber phase, irrespective of whether the matrix is crosslinked or not and whether the crosslinked matrix is swollen or not. Partial removal of bound rubber by compounding the paraffin swollen compounds could lower modulus and eliminate G″ overshoot of the deswollen vulcanizates without influence on the mechanism of G′ decay accompanying Payne effect. The overshoot is found to be closely related to the overall viscous characteristic of the vulcanizates in the linear viscoelastic regime. Provided herein are new insights for recognizing the important roles of the viscoelastic rubber phase on the Payne effect of the nanocomposites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Mingyue Wu,Linchuan Yang,Haijun Lei,Mengmeng Zhang,Rui Zhang,Rui Liu,Tongtong Zhao,Xiaoyang Xu,Yaxin Guo,Yuheng Zhu,Gang Liu,Qingzeng Zhu
Silver-filled polydimethylsiloxanes (PDMS) are expected to be used as various advanced materials . The role of silver particles on the reinforcement and rheological behaviors of PDMS composites has not been sufficiently investigated. In addition, the processing of highly viscous PDMS mixed Ag particles is a difficult work. In this work, uniformly dispersed filled PDMS composites with macro-nano Ag were prepared by an in-situ polymerization method. The viscoelasticity and strain amplitude ( ε ) dependent rheology, also known as Payne effect, of the Ag in-situ filled PDMS composites were studied in compared with those of fumed silica-filled PDMS systems, helping to comprehend the microcosmic deformation mechanisms . Bound rubber in Ag-filled PDMS was at a low level. Ag provided a reinforcement effect and introduced a rheological nonlinearity in the PDMS composites at a critical loading of 6.10 wt%. The critical strain ( ε c = 76.5%) of vulcanized Ag-filled PDMS was insusceptible with Ag contents in the range of 3.04 wt% to 14.70 wt%. Ag and fumed silica in the composites showed different rheological behaviors.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 62
·38915-38922
·
IF 3.108
Zheng Sun,Qiang Huang,Liqun Zhang,Youzhi Wang,Youping Wu
The filler–rubber interface is crucial in preparing ideal filled rubber composites. Interface modifiers are typically used for enhancing silica–rubber interactions and facilitating silica dispersion. In this work, trimethylolpropane tris(3-mercaptopropionate) (TMPMP) was found to be particularly effective in dispersing silica and the mechanism was investigated. Furthermore, the mercapto groups of TMPMP were reacted in gradient with the vinyl groups of vinyltriethoxysilane (VTES), which formed a series of interface modifiers with enhanced modifier–silica interactions and reduced modifier–rubber interactions. After applying the modifiers in silica filled rubber composites, the Payne effect, bound rubber content, dispersion morphology, mechanical and viscoelastic properties were studied. The results indicated that the interface modifiers with multiple functional groups were capable of purposefully balancing the interactions between rubber and silica, which brought about flexibility to optimize composite properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Fengyi Hou,Yihu Song,Qiang Zheng
While many works focus on aging mechanisms and mechanical performances of aged vulcanizates, rare is performed to investigate the influences of aging induced network variation on the Payne effect and energy dissipation. Herein the influence of thermo-oxidative aging on Payne effect of isoprene rubber (IR) gum vulcanized with conventional vulcanization (CV) and efficient vulcanization (EV) systems at similar crosslinking densities was investigated, in order to disclose the roles of the crosslink types and therefore the thermo-oxidative degradation on the Payne effect. The results indicate that the crosslink structure and thus the Payne effect are highly susceptible to the thermo-oxidative aging. The aging induced degradation is more severe in CV than that in EV systems, which greatly improves the dissipation of accompanying the Payne effect. This work is helpful for understanding the contribution of network structure to the Payne effect for design rubber materials with optimized aging and dynamic properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·4030-4038
·
IF 3.108
Weiyang Lv,Miao Du,Jianliang Xiao,Yihu Song,Qiang Zheng
To gain insight into nonlinear viscoelastic behavior, e.g. the Payne effect, and in situ visualize the filler structure in a rubber matrix under strain, a methodology was developed to detect and track structural evolution based on fluorescent labeling. As a model system, layered double hydroxides (LDHs) with different lateral sizes (nanosheets and microsheets) were labeled with fluorescein (FLU) and then uniformly introduced into the rubber matrix through solution blending. The strain-induced deformation and destruction of the three-dimensional LDH filler structure were directly observed for the first time through laser scanning confocal microscopy (LSCM). The contributions of the breakdown of the filler network, strain softening of the glassy layer and macromolecular disentanglement to the Payne effect were qualitatively determined and analyzed in detail based on the structural information probed via LSCM together with transmission electron microscopy, rheometry and modulated differential scanning calorimetry. The primary mechanism for the Payne effect in this system was then proposed and the macromolecular disentanglement in the rubber matrix played a key role. Furthermore, the enhanced Payne effect with increasing LDH content was ascribed to the strain amplification effect induced by the filler network for the LDH nanosheet filled system and the chain sliding on orientated LDHs for microsheet filled compounds, respectively.
研究领域:
材料科学
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高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 40
·期 1
·85-92
·
IF 3.603
Li Zhi-Yun,Song Yi-Hu,Zheng Qiang
Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude oscillations. Herein, Payne effect in diverse filled vulcanizates is investigated for generalizing the common characteristics. Master curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix, revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler, crosslinking density and sol fraction of matrix and filler-rubber interfacial interactions. However, carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous silica. The investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.
研究领域:
材料科学
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 9
·49907
·
IF 2.52
Junfei Mei,Haoran Geng,Han Yu,Jia Shi,Yanfang Zhao,Rentong Yu,Jianhe Liao,Yongping Chen
Oleylamine (OA) modified silica (SiO 2 -g-OA) was prepared using γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) and OA, silica/natural rubber (NR) and SiO 2 -g-OA/NR composites were prepared by mechanical blending in an internal mixer, and SiO 2 -g-OA was characterized by Fourier transform infrared spectroscopy, thermal gravimetric analyzer, and contact angle analyzer. The mechanical properties, abrasion resistance, curing characteristics, Payne effect, and morphology of silica/NR and SiO 2 -g-OA /NR composites were investigated using universal testing machine, Akron abrasion tester, rubber processing analyzer, and scanning electron microscope, respectively. The results showed that SiO 2 -g-OA became more hydrophobic and had better compatibility with NR. Moreover, SiO 2 -g-OA/NR had weaker Payne effect, better vulcanization performance, and more excellent mechanical properties. As the content of filler was more than 30 phr, SiO 2 -g-OA/NR had lower rolling resistance and higher wet skid resistance. Compared with silica modified by other coupling agents, SiO 2 -g-OA had the best reinforcement effect on NR.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 109
·64354-64363
·
IF 3.708
Liangliang Qu,Lijing Wang,Ximing Xie,Guozhu Yu,Shaohua Bu
A series of modified solution-polymerized styrene butadiene rubbers (M-S-SBRs) with different molar contents of polar groups were prepared through grafting 3-mercaptopropionic acid into solution-polymerized styrene butadiene rubber (S-SBR) chains. The molar contents of the polar groups in M-S-SBR were calculated using 1H nuclear magnetic resonance (1H NMR) spectroscopy. Thermodynamic analytical methods, including the surface energy of M-S-SBR and filler flocculation, show that the introduction of polar groups increases the work of adhesion of filler–rubber (Wrf), which is an indicator for the compatibility of the filler with rubber. The thermodynamic results can be further proved by TEM micrographs. Strain sweep experiments were carried out to investigate the temperature dependent nonlinear strain-dependence of elastic moduli, referred to as the Payne effect. The filler–filler network and interfacial strength were studied in terms of critical strain γc and activation energy Ea. Dynamic mechanical measurements show that a combination of higher energy dissipation in the low temperature range and higher elasticity in the high temperature region were achieved for M-S-SBR/Silica when compared with their non-modified counterpart.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 1
·153-165
·
IF 3.815
Fan Xin-Peng,Song Yi-Hu,Zheng Qiang,Wang Wan-Jie
To illustrate mechanisms of Payne effect in rubbers and their nanocomposites experiencing large amplitude oscillatory shear (LAOS), comparison studies were performed in styrene-isoprene-styrene (SIS) copolymers and their selectively crosslinked materials at temperatures below and above glass transition temperature of the polystyrene (PS) phase. It was found that under periodic dynamic shear, the strain softening is reversible when the polyisoprene (PI) phase, either crosslinked or not, is restricted by hard PS domains but it shows hysteresis once the PS domains disassociate. The strain softening can happen at the time scale of intrinsic Rouse relaxation of elastically active network strands. Critical stress of strain softening scales with number density of elastically active network strands, a simple relation being verified not only in the selectively crosslinked SIS copolymers but also in PI gum vulcanizates and carbon black filled PI compounds. Payne effect is traditionally used to term strain softening of highly filled rubber vulcanizates under LAOS deformation while evidenced herein is that the Payne effect of highly filled rubber vulcanizates shares the mechanism being common to the strain softening of SIS copolymers.
研究领域:
材料科学
·
高分子物理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Yao Xiao,Zhenchun Xu,Chuansheng Wang,Huiguang Bian
In order to realize the high value-added utilization of natural clay materials in natural rubber composites , an environment-friendly animal glycerol potassium salt was introduced to modify kaolin, and the natural rubber with excellent performance were prepared by high-energy ball milling combined with gas-phase spray drying technology . The impact of the ball milling reduced the particle size and increased the specific surface area of kaolin, promoting the chemical modification of kaolin by potassium oleate. The gas-phase spray technology effectively broke the filler aggregates, and the high-temperature roller realized the instantaneous drying, reducing the oxidation and fracture of the rubber molecular chains . In this paper, the gas barrier properties , mechanical properties, anti-aging properties, dynamic mechanical properties and Payne effect of the composites were investigated. The FTIR , XPS and interfacial contact angle demonstrated the existence of a stable chemical bonding in the process of potassium oleate-modified kaolin, and the hydrophilicity of kaolin was reduced. Kaolin was uniformly and finely dispersed in the rubber matrix by spray drying technology. Compared with the traditional dry mixing, the composites prepared by the technology improved the gas barrier properties , processing properties, comprehensive mechanical properties, and the aging coefficient increased by 23.1%, and had excellent wet skid resistance and rolling resistance.
研究领域:
材料科学
·
化学工程
·
橡胶工业
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）