Journal of Rubber Research
·
2023
·Vol. 26
·期 5
·391-405
·
IF 1.3
Wang Xuebao,Huang Ao,Zhao Min,Li Jianhua,Li Sicheng,Li Xiaobin
Room temperature vulcanised (RTV) silicone rubber is widely used in daily life. Ordinary and traditional flame-retarding RTV silicone rubber are easy to turn into brittle char layer or ashes without any self-supporting and bonding ability after experiencing a combustion process, which could not inhibit the secondary disasters after fire. To improve the fire-resistance performances of RTV silicone rubber, a new single component ceramifiable RTV silicone rubber was prepared in this work. The tack-free time, mechanical properties and thermal properties of different formulations were tested. The flexural strength and adhesion strength of the ceramic residues were studied by orthogonal designed experiments, which exhibited the maximum of 8.80 and 0.300 MPa after sintering at 1000 °C, respectively. The ceramifying process of the single component ceramifiable RTV silicone rubber at high temperatures was also investigated. These results will provide a basis for the development of fire-resistant silicone adhesive with better performance that can meet the actual needs.
研究领域:
材料科学
·
防火材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Jinfeng Tian,Liwei Yan,Hao Zhang,Yuan Wang,Yuanbo Cai,Yisen Huang,Zhaohui Lu,Shuang Xia,Yang Chen,Zhengguang Heng,Huawei Zou,Mei Liang
To achieve uniform distribution of heteroatoms in silicone rubber, further simultaneously improving the flexibility and ablation resistance, polydimethylsiloxane with an interpenetrating zirconium-containing double-network (Zr-PDMS) was prepared. Compared to pure PDMS , the tensile strength and elongation-at-break of Zr-PDMS with interpenetrating double-network were increased by 615.33% and 124.23%, respectively, exhibiting significantly enhanced flexibility. Ablation analysis indicated that Zr-PDMS showed excellent anti-ablation performance, exhibiting obviously decreased mass ablation rate and charring rate. Most importantly, different from the crisp charred layers of pure PDMS as well as ZrO 2 blends, Zr-PDMS formed stable and coherent charred layers after ablation tests. The improvement correlated to the in-situ formation of tetragonal ZrO 2 in the char layer of Zr-PDMS, which could avoid the generation of defects in the ZrO 2 blends char layer were discussed in detail. This work provided a new strategy of high flexible silicon rubber with excellent ablative performance, which can be expected to be well applied in the hypersonic spacecrafts.
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 APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 19
·
IF 1.866
Honggang Mei,Guowen Chen,Qingzeng Zhu,Peng Dong,Dannan Zhao,Waqas Ahmed Raza
Two types of vinyl silicone oil (VSO), allyl-capped hyperbranched polycarbosilane (HBP), and triethoxysilane (TES) were employed to synthesize macromolecular silane coupling agent (MMSCA) by hydrosilylation. VSOs, HBP, and the hydrosilylated products were used as crosslinker, respectively, to improve weak mechanical properties of silicone rubber (SR). Structures of the crosslinkers were studied by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR). Crosslinking density test and scanning electron microscope (SEM) observation showed an increased interaction between silicone rubber and fumed silica by the use of MMSCA. Mechanical properties of the resulted composites using MMSCAs were increased to varying degrees compared with those possessing crosslinkers without ethoxy group. MMSCAs were effective for further property enhancements of composites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43415.
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
Materials Today Communications
·
2021
·
IF 3.383
Guangzhi Jin,Yonglai Lu,Peng Yu,Liqun Zhang
Carbon dots (CDs) have attracted increasing attention as fluorescent agents for elastomer composites. Bottom-up synthesis of carbon dots (CDs) from molecular precursors would inevitably produce crude carbon dots (CCDs), i.e., a mixture of CDs, quasi CDs, polymer clusters, and molecular fluorophores. The CCDs are normally subjected to purification processes to obtain the pure CDs, while the purification procedures are time-consuming, expensive, and difficult to be scale-up. Herein, we directly used the CCDs as the fluorescent agents for silicon rubber. To achieve a good CCDs dispersion within the polymer matrix , we firstly prepared the CCDs fluid by mixing the CCDs solid with water, then the CCDs fluid was melt-mixed with the SiR (with the silica as filler) by a two-roll mill. The results revealed that small amounts of CCDs (less than 1 phr) could endow the matrix with intriguing luminescent property. Overall, this work offers a green and facile strategy to use CCDs as low-cost fluorescent agents for the SiR through melt-milling of CCDs fluid and rubber, which can be extended to a variety of other melt-processable polymer matrices (such as millable polyurethane rubber) and enables a broad range of potential applications.
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
Polymers
·
2019
·Vol. 11
·期 7
·1142
·
IF 3.164
Jianye Ji,Xin Ge,Xiaoyan Pang,Ruoling Liu,Shuyi Wen,Jiaqi Sun,Weijie Liang,Jianfang Ge,Xunjun Chen
Methoxyl-capped MQ silicone resin (MMQ) was first synthesized by the hydrosilylation of vinyl-containing MQ silicone resin and trimethoxysilane and then used in condensed room-temperature vulcanized (RTV) silicone rubber as a self-reinforced cross-linker. Results show that modified silicone rubber exhibits good light transmission. Compared with unmodified silicone rubber, the hardness, tensile strength and elongation of MMQ at the break are increased by 26.4 A, 2.68 MPa and 65.1%, respectively. In addition, the characteristic temperature of 10% mass loss is delayed from 353.5 °C to 477.1 °C, the temperature at maximum degradation rate is also delayed from 408.9 °C to 528.4 °C and the residual mass left at 800 °C is increased from 1.2% to 27.7%. These improved properties are assigned to the synergistic effect of the rigid structure of MMQ, the formation of a dense cross-linking structure in polymers and the uniform distribution of MMQ cross-linking agent in RTV silicone rubber.Keywords:cross-linker;MQ silicone resin;hydrosilylation;silicone rubber;modified
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 3
·548-558
·
IF 4.8
Li Qiuying,Lu Yiheng,Shao Zhuoyan
A new type of composite filler was designed by a modified sol—gel method using fly ash (FA), Fe(NO 3 ) 3 ·9H 2 O, and Ni(NO 3 ) 2 ·6H 2 O as raw materials. The composite filler was a spherical core-shell structure composed of FA as the core and NiFe 2 O 4 as the shell. Further, the composite filler was added into the silicone rubber to fabricate the high temperature vulcanized microwave absorption materials; X-ray diffraction, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope confirmed that NiFe 2 O 4 was successfully coated on the surface of FA and formed a uniform and continuous coating layer. As expected, silicone rubber filled with the composite filler had a minimum reflection loss of −23.8 dB at 17.5 GHz with the thickness of 1.8 mm, while the effective absorption bandwidth was as high as 12 GHz. The addition of the composite filler greatly enhanced the microwave absorption properties of the system, which was resulted from multiple losses mechanism: interface polarization losses, magnetic losses, and multiple reflection losses. Also, silicone rubber filled with the composite filler exhibited excellent thermal stability, flexibility, environmental resistance, and hydrophobicity compared with traditional silicone rubber. Therefore, this work not only responds to the green chemistry to achieve efficient FA recovery, but also devises a new strategy to prepare microwave absorption materials with strong potential for civilian applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Haiyang Li,Xuanhe Ru,Ying Song,Huanping Wang,Chenhui Yang,Shuirong Zheng,Lei Gong,Xiaoguang Zhang,Hongji Duan,Zhenguo Liu,Qiuyu Zhang,Yanhui Chen
There is a pressing demand for efficient electromagnetic interference (EMI) shielding materials with strong electromagnetic wave absorption and low reflection for the protection of next-generation communication technologies and wearable electronic devices. In this work, silicone rubber/MXene/Fe3O4 (SRMF) composites with a sandwich-like structure were fabricated using vacuum-assisted dipping and curing. The top and bottom layers of the SRMF composites are magnetic layers containing Fe3O4 particles and silicone rubber (SR), while the middle layer is a 3D conductive network of MXene aerogel film and SR. This sandwich-like structure enables the composites to effectively shield incident electromagnetic waves and improve the absorption of electromagnetic waves through a mechanism of “absorption–reflection–reabsorption”. The electromagnetic shielding performance of a sandwich-structured SR composite containing 1.2 wt % MXene and 20 wt % Fe3O4 reached 55.5 dB, which was higher than that of a blended SRM1.2F20b composite containing the same proportion of MXene and Fe3O4 (23.1 dB), while the power coefficient of reflectivity was 0.65. The SRMF composites also retained their EMI shielding performance after 1000 bending cycles and displayed good tensile strength. These flexible SRMF composites have broad application prospects in the field of electromagnetic protection of wearable devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Shengping Dai,Meng Li,Hao Yan,Hao Zhu,Hongwei Hu,Yixing Zhang,Guanggui Cheng,Ningyi Yuan,Jianning Ding
Adhesive and self-healing elastomers are urgently needed for their convenience and intelligence in biological medicine, flexible electronics, intelligent residential systems, etc. However, their inevitable use in harsh environments results in further enhancement requirements of the structure and performance of adhesive and self-healing elastomers. Herein, a novel self-healing and high-adhesion silicone elastomer was designed by the synergistic effect of multiple dynamic bonds. It revealed excellent stretchability (368%) and self-healing properties at room temperature (98.1%, 5 h) and in a water environment (96.4% for 5 h). Meanwhile, the resultant silicone elastomer exhibited high adhesion to metal and nonmetal and showed stable adhesion in harsh environments, such as under acidic (pH 1) and alkaline (pH 12) environments, salt water, petroleum ether, water, etc. Furthermore, it was applied as a shatter-proof protective layer and a rust-proof coating, proving its significant potential in intelligent residential system applications.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Hongyan Zhang,Yingze Li,Naiyu Jiang,Nan Zhou,Xiaohu Zou,Dongxing Zhang
The primary challenges in utilizing thermoplastic poly(ether-ether-ketone) (PEEK) stem from its inherent lack of toughness in production settings. Traditional methods of enhancing toughness often compromise other essential properties of the material. This research focuses on optimizing the toughness of PEEK resin composites by integrating graphene oxide (GO) and silicone rubber (SR) particles into the PEEK matrix to formulate multiphase composites. A detailed investigation was carried out to assess the impact of these two distinct particles on the PEEK resin properties. In the evaluation of toughness across various composite materials, a notable enhancement was evident in the GO/PEEK, SR/PEEK, and GO/SR/PEEK ternary composites compared to the pristine PEEK. Furthermore, these composites maintained comparable stiffness and thermal resistance to standard PEEK. Tensile strength, fracture absorbed energy, and fracture toughness in GO/SR/PEEK ternary composites versus pure PEEK indicated increases of 18.38%, 174.53%, and 46.37%, respectively. Fracture analysis demonstrated that multi-particle modification methods significantly complicated toughening mechanisms, including rubber voiding, matrix shear band formation, crack deflection, and matrix plastic deformation. The findings from this study propose a viable material design principle for engineering materials that effectively balance strength and toughness. Highlights The GO/SR/PEEK composites with a balance between strength and toughness. GO and SR exert a synergistic effect on the mechanical properties balance of PEEK. The plastic deformation is promoted as the main toughening mechanism. GO and SR enhanced PEEK crystallization, improving its mechanical properties.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2024
·
IF 2.6
Qiang Li,Mingdong Lei,Ziyou Li,Qiang Gan,Yong Sun,Xiaoxing Wei
Neat high-temperature vulcanized silicone rubber (HTV SR) showed bad hydrophobicity due to the existence of a large number of inorganic reinforcing fillers on its surface, which affected its security application in outdoor insulation systems. In this work, hydrophobic silane chains were grafted onto the surface of inorganic particles on the skin layer of HTV SR by a one-step coupling modification to improve its hydrophobicity. The effects of coupling agent types and coupling reaction conditions on the hydrophobicity of HTV SR were investigated. It was determined that the perfluorooctane trichlorosilicon with a large number of low surface energy fluorine atoms was the preferred coupling agent. The contact angle of HTV SR was increased by 15.70% when the optimal coupling reaction conditions were determined to be a reaction temperature of 60°C, a reaction time of 4 h, and an amount of coupling agent of 0.5%. The study found that both etching reaction and grafting reaction occurred during the whole coupling modification process, which led to the disappearance or decrease of a lot of holes on the HTV SR surface. After the fluorination coupling reaction, the surface of HTV SR became smooth and dense that led to the decrease of water absorption. The result of Fourier-transform infrared spectroscopy analysis showed the formation of C-F bond in HTV SR after fluorination modification, and the energetic dispersive spectroscopy analysis showed that the fluorine content on the surface of the fluorinated HTV SR increased significantly. Moreover, the stability analysis showed that the fluorinated HTV SR still had a good thermal stability and mechanical property stability.
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 POLYMER RESEARCH
·
2024
·Vol. 31
·期 7
·1-11
·
IF 2.6
Yang Rui,Dai Zilin,Kong Zhenxing,Ou Juhua
Procuring silicone rubber composite with different content of vinyl MQ silicone resin was prepared and its thermal stability was evaluated. A total of 50 wt% MQ resin containing 5 wt% vinyl MQ exhibited optimal thermal stability and was consequently chosen. This silicone rubber composite was blended with TPU at high temperature using an internal mixer to produce a modified TPU. The TPU modified by silicone rubber was firstly investigated by Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). The FTIR results indicated that negligible chemical reactions occurred between TPU and silicone rubber during the mixing process. Furthermore, the TGA results demonstrated that the silicone rubber composite positively influenced the thermal stability of TPU. Additionally, the modified TPU displayed satisfactory thermal stability even after aging. Moreover, Scanning Electron Microscope (SEM) results indicated that uniform dispersion of silicone rubber was facilitated by the banburying method. The tensile strength of modified TPU initially increased and then decreased when the content of silicone rubber reached 3 wt%. On the other hand, the elongation at break of modified TPU demonstrated continuous improvement. Furthermore, the mechanical properties of the modified TPU were still acceptable after aging.
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
Materials
·
2020
·Vol. 13
·期 4
·894
·
IF 3.057
Yafang Zhang,Wang Li,Juhua Huang,Ming Cao,Guoping Du
In this work, expanded graphite/paraffin/silicone rubber composite phase-change materials (PCMs) were prepared by blending the expanded graphite (EG), paraffin wax (PW) and silicone rubber (SR) matrix. It has been shown that PW fully penetrates into the three dimensional (3D) pores of EG to form the EG/PW particles, which are sealed by SR and evenly embedded in the SR matrix. As a result of the excellent thermal stability of SR and the capillary force from the 3D pores of EG, the EG/PW/SR PCMs are found to have good shape stability and high reliability. After being baked in an oven at 150 °C for 24 h, the shape of the EG/PW/SR PCMs is virtually unchanged, and their weight loss and latent heat drop are only 7.91 wt % and 11.3 J/g, respectively. The latent heat of the EG/PW/SR composites can reach up to 43.6 and 41.8 J/g for the melting and crystallizing processes, respectively. The super cooling of PW decreased from 4.2 to 2.4 due to the heterogeneous nucleation on the large surface of EG and the sealing effect of the SR. Meanwhile, the thermal conductivity of the EG/PW/SR PCMs reaches 0.56 W·m−1·K−1, which is about 2.8 times and 3.73 times of pure PW and pristine SR, respectively. The novel EG/PW/SR PCMs with superior shape and thermal stabilities will have a potential application in heat energy storage and thermal interface materials (TIM) for electronic devices.Keywords:phase change material;expanded graphite;paraffin;silicon rubber;composite
研究领域:
材料科学
·
热能存储
·
电子器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）