Polymers
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2022
·Vol. 14
·期 5
·903
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IF 4.967
Zhe Liu,Hua Wang,Chuanjian Zhou
An elastomer with mechanical adaptability is a new kind of polymer material in which the increasing stress under continuous deformation is significantly inhibited in a large deformation area. Liquid crystal-based organosilicone elastomers, which can dissipate energy through reversible internal phase transition under external stimulation and have recoverable large deformation capacity, have drawn much interest as mechanical adaptability materials. However, there is no good way to control the mechanical adaptability at present. For this purpose, we prepared a new liquid crystal-based phenyl silicone rubber (LCMVPQ) using two-step click reactions and systematically explored the effect of phenyl content on its mechanical adaptability to achieve the regulation of mechanical adaptability. With an increase in phenyl content in the LCMVPQs, phenyl can hinder the rearrangement of the mesogenic units along the applied stress direction, which enables the adjustment of mechanical adaptability to meet the needs of different situations. In addition, the introduction of the liquid crystal phase impedes the internal friction of the molecular chain movement of the LCMVPQs and reduces the damping performance of silicone rubber. This research achieves the regulation of elastomers with mechanical adaptability and is expected to be applied in practical application fields.Keywords:liquid crystal-based phenyl silicone rubber;phenyl content;the regulation of mechanical adaptability;damping performance
研究领域:
高分子科学
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材料科学
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机械工程
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 19
·6962-6967
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IF 5.101
Min Wang,Chen Chen,Jiping Ma,Jie Xu
A new superhydrophobic material with cauliflower morphology was prepared with a one-step introduction of organic groups on the materials surface. Rough surface structure and heterogeneous surface chemical composition could be directly obtained. Adjustment of the phenyl group content was utilized to modulate the surface wettability, and different hydrophilic, hydrophobic, and superhydrophobic materials could be obtained by simply controlling the ratio of phenyl groups and silanols. The dynamic wettability of the superhydrophobic materials could be flexibly tuned between water repellent and water adhesive by the adjustment of the surface chemical composition. Especially the unique water-adhesive superhydrophobic material demonstrates capacity in solid and water transfer, and it may show wide application in the future.
研究领域:
材料科学
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表面化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Shaoji Wang,Fan Zhang,Yang Zhang,Lulu Wang,Shuanglong Xiao,Jilin Wang
Aryl ether-free aromatic polyelectrolytes featuring π-π stacking interaction exhibit remarkable conductivity and alkaline stability. This is attributed the formation of well-ordered ion-conducting channels and the prevention of backbone cleavage. However, the π-π stacking units usually consist of multiple phenyl groups. This characteristic results in significant adsorption of phenyl groups onto hydrogen oxidation catalysts, consequently impeding the performance of fuel cell. Herein, fluoranthene units with low phenyl content are employed in aryl ether-free backbones to prepare novel π-π stacking based anion exchange membranes (AEMs) and anion exchange ionomers (AEIs). The low-density phenyl content π-π stacking units effectively construct ion transport channels and weaken the phenyl group adsorption on hydrogen oxidation catalysts. The as-prepared polyelectrolyte works as AEI and AEM achieving both outstanding conductivity (143.69 mS/cm) and single cell performance (1.527 W/cm 2 ) at 80 °C. Furthermore, the membrane prepared in this study demonstrates outstanding mechanical strength (39.5 MPa) and alkaline stability. Specifically, it maintains 92 % of its initial conductivity after being exposed to 3 M KOH at 80 °C for 1000 h. This remarkable performance can be attributed to the rigid fluoranthene units and the aryl-ether-free backbones, which contribute to the membrane's structural integrity and resistance to degradation under alkaline conditions.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 9
·1187
·
IF 4.9
Ao Liu,Linlin Ouyang,Depeng Gong,Chaocan Zhang
To enhance the high-temperature resistance of silicone rubber and meet the application requirements of flexible conductive silicone rubber under elevated temperature conditions, this study adopts a chemical modification strategy by introducing phenyl groups into the molecular chains of silicone rubber to improve its thermal resistance. High-phenyl-content hydroxyl-terminated silicone oil (MPPS) was used as the polymer backbone, and vinylmethyldimethoxysilane (VDMS) served as the chain extender. Through a silanol condensation reaction, vinylmethylphenyl polysiloxane (VMPPS) with a crosslinkable structure was synthesized, providing reactive sites for subsequent vulcanization and molding. Subsequently, needle-like silver-coated glass fiber (AGF) conductive fillers were prepared via a green and environmentally friendly electroless silver plating method. These fillers were incorporated into the phenyl polysiloxane matrix to impart electrical conductivity to the phenyl silicone rubber while synergistically enhancing its thermal resistance. Finally, thermally resistant conductive silicone rubber was fabricated through high-temperature vulcanization, and the key properties of the material were systematically characterized. The synthesized phenyl polysiloxane exhibited a number-averaged molecular weight of up to 181,136, with a PDI of 2.43. When the loading of AGF reached 25 phr, the phenyl silicone rubber composite achieved the electrical percolation threshold, exhibiting a conductivity of 7.12 S/cm. With a further increase in AGF content to 35 phr, the composite demonstrated excellent thermal stability, with a 5% weight loss temperature of 478 °C and a residual mass of 37.36% at 800 °C. Moreover, after thermal aging at 100 °C for 72 h, the conductivity degradation of the phenyl silicone rubber was significantly lower than that of commercial silicone rubber, indicating outstanding electrical stability. This study provides an effective approach for the application of flexible electronic materials under extreme thermal environments.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
LANGMUIR
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2023
·
IF 3.9
Lei Tan,Yukun Chen,Wenxin Fu,Jinfeng Tian,Yuan Wang,Xiaohui Li,Yilin Zhou,Shuang Xia,Mei Liang,Huawei Zou
We present a facile chemical method for fabricating bioinspired microadhesives with significant improved reversible adhesion strength. Four kinds of polysiloxane with gradient varying phenyl contents were synthesized and used to fabricate microadhesives. The chemical structures and mechanical properties, as well as surface properties of the four microadhesives, were confirmed and characterized by ATR-FTIR, DSC, XPS, low-field NMR, tensile tests, and SEM, respectively. The macroadhesion test results revealed that phenyl contents showed remarkable and positive impacts on the macroadhesion performance of microadhesives. The pull-off adhesion strength of microadhesives with 90% phenyl content (0.851 N/cm2) was nearly 300% higher than that of pure PDMS (0.309 N/cm2). The macroadhesion mechanism analysis demonstrates that a larger bulk energy dissipation caused by massive π–π interaction, as well as the hydrophobic interaction and van der Waals forces at the interface synergistically resulted in a significant enhancement of the adhesion performance. Our results demonstrate the remarkable impact of chemical structures on the adhesion of microadhesives, and it is conducive to the further improvement of adhesion properties of bioinspired microadhesives.
研究领域:
材料科学
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化学工程
·
表面科学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Shengqiang Wang,Zhenbo Peng,Yanhua Huang,Mingquan Zhu,Yayun Liu,Yong Zhang
Phenyl-containing polysiloxanes have better thermal stability, low-temperature flexibility, and room-temperature damping performance than polydimethylsiloxanes. Poly [dimethylsiloxane- co -methyl (phenyl)siloxane] and poly (dimethylsiloxane- co -diphenylsiloxane) were synthesized through a bulk copolymerization of octamethylcyclotetrasiloxane and methylphenylcyclosiloxane mixture or octaphenylcyclotetrasiloxane, and the structure and properties of the copolysiloxanes were comparatively studied. The phenyl content in poly [dimethylsiloxane- co -methyl (phenyl)siloxane] can be as high as 50 mol%. With the increment of the phenyl content, the thermal stability of the copolysiloxanes is dramatically improved as evaluated by thermal gravimetric analysis. At a given phenyl content, poly [dimethylsiloxane- co -methyl (phenyl)siloxane] has higher thermal stability than poly (dimethylsiloxane- co -diphenylsiloxane). The former is more difficult to crystalline at low temperatures and has lower room temperature viscosity than the latter as confirmed by differential scanning calorimetry and rotational rheometer. The copolysiloxanes is mixed with hydrogen-containing polysiloxane and silica, and vulcanized at elevated temperature to get copolysiloxane composites with good damping properties, oil resistance, and low-temperature resistance. This study not only enriches the fundamental academic research on functional polysiloxanes, but also provides useful technical references for practical applications of phenyl silicone rubber.
研究领域:
高分子科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
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