MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 3
·2200681
·
IF 5.006
Yizhi Jiao,Zhihao Rong,Chuanhui Gao,Yumin Wu,Yuetao Liu
Silicone elastomers are widely used in aviation, electronics, automotive, and medical device fields, and their overuse inevitably causes recycled problems. In addition, the elastomers are subject to attack by bacteria and fire during use in some application scenarios, which is a safety hazard. Therefore, there is a great need to prepare silicone elastomers with improved antibacterial, flame retardant, self-healing, and recyclable functions. A new strategy is proposed to prepare silicone elastomers with bio-based tannic acid as cross-linkers to solve this problem by using polydimethylsiloxane as a soft chain segment and 2,2-bis(hydroxymethyl)propionic acid as an intermediate chain extender. Based on the phenol carbamate bonding and hydrogen bonding interactions, the elastomer has efficient self-healing ability and can achieve dynamic dissociation at 120 °C for complete recovery. In addition, due to the unique spatial structure and polyphenolic hydroxyl groups of tannic acid, the mechanical properties of the elastomer are greatly improved with an antimicrobial efficiency of over 90% and a final oxygen index of 25.5%. The multifunctional silicone elastomer has great potential applications in recyclable refractory materials and antimicrobial materials.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Wen Zhao,Meng Zhang,Huijin Li,Yao Du,Qiuxiang Bu,Lan Cao,Chengzhong Zong
An innovative bioinspired method is presented for the preparation of surface-modified nanodiamonds (ND) particles by poly(dopamine) (PDA). The process was aimed at improving the thermal conductivity and maintaining the insulating capability of silicone rubber (SiR). ND was successfully and effectively modified by dopamine in different hours, which was confirmed by HR-TEM, TGA, FTIR, and XRD . The poly(dopamine) coating on ND particles improved its interfacial interaction with silicon rubber and promoted the uniform dispersion of fillers, resulting in the ND-18/SiR composite that acquired a higher thermal conductivity (0.295 W/(m·K)) at the loading of 6 wt%, 81 % higher than that of pure silicone rubber (0.163 W/(m·K)). In addition, the composite materials still displayed an excellent insulating property with a resistance of ≈10 11 Ω·cm, which was a big advantage for thermal management.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Membranes
·
2023
·
IF 0
Zhihu Zhao,Guoke Zhao,Gongqing Tang,Yiqun Liu,Pei Li
In this study, a multi-layer pervaporation composite membrane was prepared by spray-coating a hydrophilic layer consisting of poly(allylamine hydrochloride) (PAH)/polyvinyl alcohol (PVA)/trimesic acid (BTA) onto a polyethersulfone (PES) porous substrate. The presence of amine groups facilitated the transport of water molecules, enabling the composite membrane to exhibit excellent water/ethanol separation properties. When a feed solution consisting of 90 wt% ethanol and 10 wt% water was dehydrated using the PV membrane at 70 °C, a flux of 1.46 kg m −2 h −1 with a water/ethanol separation factor of 3300 was realized. In addition, after coating a 267 nm silicone rubber layer on top of the membrane, the separation factor was further increased by 70.79 % to 5285, while the flux was slightly decreased by 12.33 % to 1.28 kg m −2 h −1 . This was because the hydrophobic silicone rubber layer reduced the water swelling effect of the selective layer and hindered the permeation of ethanol-water coupling molecules, resulting in a reduction in the ethanol flux of the composite membrane and an improvement in the separation factor. This simple but effective method to improve dehydration properties was very useful for fabricating PV composite membranes.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
DOI
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Xuan Guo,Hua Deng,Qiang Fu
Materials with low dielectric constant have drawn more and more attention due to their wide range of applications in electronic devices. Two type of methods are often used to reduce the dielectric constant of a given materials: introducing voids and replacing groups having higher polarizability with the ones having lower through copolymerization . Different from above methods, current study proposes a novel and efficient method by allow inorganic filler participating the curing process of polymer matrix , thus, consuming some of the functional groups with high polarizability. Nickel hydroxide (Ni(OH) 2 ) is selected as filler to be dispersed in room temperature vulcanized silicone rubber (SR). The addition of 1% Ni(OH) 2 into SR has resulted a decrease in dielectric constant from 3.1 to 2.1, and slightly reduced dielectric loss. With further increasing Ni(OH) 2 content, the dielectric constant increases gradually. From various characterizations, it is confirmed that Ni(OH) 2 is involved in the curing process of SR, thus, the hydroxyl group content in the final composites is reduced. Meanwhile, Ni(OH) 2 with different size and synthesized Ni(OH) 2 from hydrothermal process is also used to further confirm such observation. This method provides a novel route for the preparation of low dielectric constant materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Anna Bao,Xiang Sun,Paul Joseph,Meiling Zhong,Ri-Chao Zhang
In this work, we report on a successful method to fabricate phenyl silicone rubber (P-SR)/graphite composites, with superior viscoelastic properties over a wide temperature range, through an open roll mill mixer. The results obtained showed that the viscoelastic property of P-SR was greatly improved by the incorporation of graphite, as evidenced by the increases in tan δ of composites with the loading of graphite. Specifically, the effective damping temperature ranges of composites with the tan δ > 0.3 can reach 280°C for the 60 parts per hundred rubber (phr) graphite loadings. While the damping temperature ranges of the pure P-SR were only 30°C, thus showing that the incorporation of graphite can greatly improve the viscoelastic property of P-SR. Moreover, the tensile stress strength and elongation at break of the composites were found to be significantly improved compared to the pure P-SR. The enhancements in the properties can be attributed to a greater degree of homogeneous dispersion of the graphite in the composite matrices.
研究领域:
材料科学
·
声学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Ruirui Shi,Xinyi Han,Lin Zhu,Jinghao Hao,Hua Wang,Chuanjian Zhou
Fluorosilicone rubber (FSR) has become an indispensable sealing material due to its exceptional adaptability to extreme temperatures and non-polar media environments. In this study, the influence of interfacial interactions and fluorine content in FSR composites on their mechanical properties and oil resistance was investigated. Three modified M5s (@M5) were firstly prepared by surface modification of fumed silica M5 using three fluorinated silane coupling agents with different chain lengths. Among them, though 13F@M5 and 17F@M5 exhibit weaker interfacial interactions with the FSR matrix, they exhibit remarkable hydrophobicity (water contact angle >142°) and dispersibility. Additionally, among the three @M5/FSR composites, 13F@M5/FSR and 17F@M5/FSR exhibit excellent tensile strength (>11.1 MPa) and elongation at break (>490 %), while 3F@M5/FSR shows superior oil resistance, with only a 5.1 % decrease in tensile strength after 48 h of immersion in IRM 901 at 150 °C. The analysis of the interfacial structures reveals that interfacial interactions play a decisive role in the oil resistance of FSR composites, whereas the fluorine content indirectly affects the oil resistance by preventing the oil molecules from immersing into the interphase. The present study not only provides a comprehensive understanding of interfacial interactions and the influence of fluorine content on the properties of FSR composites, but also offers valuable insights for the design of high-performance composite interfaces.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiana Hu,Caiyun Liang,Jiadong Li,Chuanwei Lin,Yongjiu Liang,Dewen Dong
2D transition metal carbide/nitride (MXene) nanomaterials have prospective applications in high-performance microwave absorption (MA). However, the excessively high permittivity, absence of magnetic loss, and susceptible oxidizability of MXene severely hinder the enhancement of its MA properties. Here, we used a facile organic solution–phase thermal decomposition method to prepare dielectric–magnetic MXene@CoNi nanocomposites with heterojunctions , which can effectively prevent the oxidation of MXene . Subsequently, the MXene@CoNi nanocomposites were integrated with magnetic CoNi alloys, MXene microspheres (MXene MPs), and a silicon rubber (SR) matrix to construct multilayered CoNi/MXene@CoNi/MXene MPs/SR composites by casting and curing. Benefiting from the multilayered structure and complementary effects of the dielectric and magnetic components, the multilayered CoNi/MXene@CoNi/MXene MPs/SR composites composed of matching, absorbing, and reflective layers showed a remarkable minimum reflection loss of −53.3 dB and an ultra-broad effective absorption bandwidth up to 11.12 GHz at a thickness of 2.96 mm. These results demonstrated the developed multilayered composites are promising candidates for high-performance MA. Our study provides new insights into the development of ultra-broadband MXene-based absorbent materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 12
·e70018
·
IF 3.1
Xiaowen Wang,Jun Yan,Yan Yu,Haoyan Qiu,Xuanchuan Li,Paul Joseph,Meiling Zhong,Xinyue Hu,Ri-Chao Zhang
Generally, polymeric materials with superior damping characteristics are in great demand for many advanced functional applications, such as in building, aerospace, electronics, and transport sectors. However, it still remains a challenge to improve the damping characteristics of such materials owing to the lack of adequate practical knowledge in this area. Here, we report on the successful fabrication of silicon rubber (SR)/ferric oxide (Fe 3 O 4 ) composites with excellent damping characteristics. The results obtained from the study showed that the damping characteristics of the specimens increased with the loading of Fe 3 O 4 within a range of −105°C to 200°C. Specifically, the damping factor (tan δ ) is 0.45 at room temperature, and the effective working temperature, the temperatures that correspond to the tan δ > 0.3, ranged from −105°C to 165°C for the loading of Fe 3 O 4 at 60 phr. The scanning electron microscopy results showed that the excellent damping characteristics of composites can be attributed to the good dispersion of Fe 3 O 4 in the SR matrix. This work, therefore, opens up a pathway toward a relatively easy and up-scalable means for fabricating polymer composites that have superior damping characteristics and ones with a wider applicability.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 12
·e6591
·
IF 3.1
Chuanbo Cong,Mingyang Yuan,Han Wang,Rehan Umer,Daigang Peng,Jianglin Ouyang
In order to improve the thermal stability of silicone rubber (SR), cerium-tin composite oxides (CeSnO-x) are used as thermo-oxidative stabilizer in phenyl methyl vinyl silicone rubber (PVMQ). CeSnO-x are synthesized via the sol–gel method and characterized by scanning electron microscopy, x-ray diffraction, and X-ray photoelectron spectroscopy (XPS) showing that tin doping led to more oxygen vacancies in CeSnO-x compared to CeO 2 . Through thermogravimetric analyzer, differential scanning alorimetry (DSC) and average activation energy calculation of PVMQ with different thermo-oxidative stabilizer, it was found that CeSnO-8 is outperforming CeO 2 , SnO 2 , and their mixtures in improving the thermo-oxidative stability of PVMQ. In mechanical property tests, due to tin doping, CeSnO-8 exhibit superior performance at all stages during thermo-oxidative aging comparing the different effects of CeO 2 and SnO 2 in different aging stages. XPS of PVMQ composites investigate the mechanism by which CeSnO-8 exhibit different effects. Fourier transform infrared spectroscopy characterizing the Si-C and Si-O bond changes in PVMQ composite before and after aging and the measurement of Mc explore thermo-oxidative stabilizers' role during thermo-oxidative aging of PVMQ. Thermogravimetry-infrared spectroscopy comparisons between unstabilized PVMQ and CeSnO-8-stabilized PVMQ show that CeSnO-8 effectively quenched radicals produced by the oxidation of the PVMQ side group, but exacerbate degradation caused by molecular chain rearrangement.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56094
·
IF 2.7
Zhiting Tu,Weijian Wu,Zhifeng Hao,Xiang Chen,Qiuling Chen,Xiaonan Huang,Mohamed S. Selim,Jian Yu
In order to overcome the commercialized silicone-based thermal interface materials' issues such as oil leakage and mechanical damage, we developed a thermoset silicone rubber matrix (SR) achieved through the condensation reaction of hydroxyl silicone oil and tetraethyl silicate. Additionally, we constructed a self-healing and recyclable silicone rubber matrix (SCNR) by incorporating heat reversible ionic and hydrogen bonds between carboxyl and amino functionalized polydimethylsiloxane. Finally, the flexible, low oil leakage, self-healing, and recyclable composites Al 2 O 3 /BN@SR/SCNR was prepared by adjusting the ratio of SR/SCNR and the spherical alumina and boron nitride (BN) fillers. The results indicated that with SR/SCNR mass ratio of 1/0.075 and filler content of 70 wt%, the thermal conductivity of the composite reaches 1.866 W m −1 K −1 , 646% increasing over the SR/SCNR matrix. The self-healing efficiency reaches 97% and the thermal conductivity remains essentially unchanged after being recycled for three times. The composites can be bent and twisted multiple times and still return to their original shape. Notably, the oil leakage of the Al 2 O 3 /BN@SR/SCNR composites is significantly lower than that of additive silicone composites. Therefore, the recyclable thermal conductivity composite developed in this study provides a promising solution for improving the durability of heat dissipation materials in electronic devices.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
High Voltage
·
2024
·
IF 4.4
Shifang Yang,Zexuan Zhang,Qianpeng Hou,Yunpeng Liu,Chi Gong
The authors explore the limitations of silicone rubber (SR) in tropical environments due to its lack of antimicrobial activity. The use of a 2-methylisothiazol-3(2H)-one compound with 5-chloro-2-methylisothiazol-3(2H)-one is proposed as an efficient and environmentally friendly antimicrobial agent to enhance the fungistatic properties of SR. The fungicide added specimen was obtained by directly adding a quantitative amount of isothiazolinone to the polymer system. Through an in-depth analysis of the material properties of MCMSR, the form in which 2-methyl-4-isothiazolin-3-one/5-chloro-2-methyl-4-isothiazolin-3-one (MIT/CMIT) exists in the molecular structure of the SR crosslink system was carefully explored. The accelerated hydrolysis process of polysiloxane, which caused fungi secretion, was proven to be suppressed due to the effects of MIT/CMIT. The antimicrobial mechanism of isothiazolinone in preventing microbial growth was interpreted as the apoptosis and necrosis procedures of Aspergillus niger cells, which were verified by flow cytometry results. By choosing the appropriate concentration of isothiazolinone, the original properties of the SR were successfully maintained while effectively preventing the aggregation of isothiazolinone. This opens up a new research direction and application prospect for the antimicrobial modification of SR.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhaoqun Shao,Min Zhu,Yang Yang,Longjin Huang,Shichun Li,Xueyan Zhao,Chunhua Zhu,Yu Liu
Antioxidants are usually used to improve the anti-aging properties of rubber, however, which will hinder the vulcanization of rubber. It is great significance to reveal the hindrance mechanism for the preparation of high performance composites. There, a series of silica and dopamine modified silica filled silicone rubber compound were prepared, with benzoyl peroxide (BPO) as vulcanizator. The results show that, dopamine would inhibit the crosslinking of BPO, resulting in the decrease of the crosslinking density and the mechanical properties. Based on the vulcanization mechanism of BPO, it is speculated that dopamine hinders vulcanization by providing H atoms to consume BPO. The reaction product benzoic acid (BA) was detected on the surface, which was confirmed by mass spectrometry, 1 H NMR, FT-IR, and XPS, which confirms the conjecture. EPR and DFT analysis further explained the hindrance mechanism of polydopamine (PDA) on vulcanization, which indicates that BPO preferentially abstract hydrogen from PDA rather than rubber, due to the low bond dissociation energy of PDA. This leads to the consumption of BPO, and reduces the concentration of free radicals used for vulcanization, resulting in insufficient crosslinking. Understanding the reaction mechanism of dopamine and BPO is of great significance for screening antioxidants for peroxide crosslinking system.
研究领域:
材料科学
·
化学工程
✓ 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）