JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54427
·
IF 3
Dingsong Wang,Jingjing Qin,Jiaming Liu,Mengqin Wu,Lifu Fu,Xiaohong Liu,Min Shi,Liyan Liang,Yonglu Dong
As reported herein, a novel addition-type liquid silicone rubber (LSR)/red mud (RM) composite has been synthesized. Triethoxyvinylsilane (KH151) was used as a surface modification agent to treat RM and form hydrophobic surfaces. The optimal formulation of the composite was determined by the mechanical properties of the LSR that were prepared at different crosslinker and filler contents. The reinforcement mechanism of modified RM on LSR was revealed by combining Fourier transform infrared (FTIR) spectroscopy, x-ray photoelectron spectroscopy and mechanical property tests. Thermal degradation behavior of RM/LSR at elevated temperature was investigated by the thermogravimetric analysis (TG), TG-FTIR and alteration of mechanical properties after thermal aging. The results of the experiment indicate that modified RM increased the tensile strength and Young's modulus of LSR dramatically and provides superior thermal stability to the LSR. With 100 phr RM added, the tensile strength of RM/LSR composite was almost 12 times greater than that of pure LSR, and pure LSR degrades completely after aging at 300°C for 24 h while RM/LSR retains its mechanical properties.
研究领域:
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
FIRE AND MATERIALS
·
2023
·Vol. 47
·期 8
·1082-1091
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IF 1.9
Ke Shang,Gui-De Lin,Hui-Jing Jiang,Xing Jin,Jing Zhao,Dan Liu,Bi Zhao,Jin-Jun Yang,Teng Fu,Jun-Sheng Wang
Two types of ceramifiable flame-retardant room temperature vulcanized (RTV) silicone rubber foam containing mica power (MP) were prepared by using glass powder (GP) as fluxing agents and aluminum hydroxide (ATH) as flame-retardant agent, respectively. The flame retardant, combustion behavior, and thermal stability of ceramifiable flame-retardant RTV silicone rubber foams were investigated. The results show that GP is not conducive to the flame retardancy and thermal stability improvement of the foams. On the contrary, MP and ATH can significantly improve the flame retardancy and thermal stability at high temperatures of the foams. The foams with addition of MP and ATH can reach to a high limiting oxygen index value of 35.8 with V-0 rating in the vertical combustion test, and the total heat release and total smoke production of the foams are 21.0% and 61.7% lower than of the pure RTV silicone rubber foam, respectively. Furthermore, the structural and morphological changes of the foams under different pyrolysis conditions were studied, so as to reveal its ceramifiable mechanism under different fire scenarios. The results show that GP does not promote the formation of more char residue during pyrolysis, but it can greatly lower the ceramifiable temperature, resulting in a superior ceramic phase char residue. The foams including MP and ATH have a high char residue content; nevertheless, a comparatively higher temperature is necessary to create ceramic phase char residue.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chengpeng Zhang,Tianyi Zhou,Guozhang Gu,Chaoyi Cai,Dongdong Hao,Guoxiang Zou,Jinchun Li,Rong Yang
Polymer modification using silicone rubber represents a promising avenue for enhancing physico-mechanical properties. However, achieving optimal performance through direct blending is hindered by the poor interface compatibility between silicone rubber and the matrix. In this study, we prepared super-tough thermoplastic vulcanizates (TPVs) of polylactic acid/silicone rubber through dynamic vulcanization with PLA, methyl vinyl silicone rubber (MVQ), glycidyl methacrylate grafted MVQ (MVQ- g -GMA), and fumed silica nanoparticles (SiO 2 ). The impact of the SiO 2 addition in MVQ on the morphology, mechanical properties, crystallization, and thermal properties of the TPVs was investigated. The results showed that MVQ- g -GMA and SiO 2 exhibited a synergistic compatibilization effect significantly improving the interfacial adhesion between PLA and MVQ. Therefore, the impact and tensile strength of the TPVs increased from 8.0 kJ/m 2 and 22.2 MPa to 62.6 kJ/m 2 and 36.7 MPa, respectively. Moreover, the TPVs also presented good low-temperature toughness with a maximum impact strength of 40.4 kJ/m 2 at −20 °C. Additionally, improvements in thermal stability and crystallization rate were also observed. Overall, combining organic and inorganic synergistic compatibilization is a feasible and effective method to fabricate outstanding low-temperature toughness to PLA.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 24
·2300359
·
IF 2.5
Kuan Zhang,Lin Dang,Junliang Zhang
Silicone rubbers are widely employed in various fields such as electronics, electrical engineering, mobile communications, aerospace, and automotive industries. However, silicone rubbers are typically challenging to reprocess and degrade. Moreover, with the advancement of technology, higher demands are placed on its thermal conductivity and dielectric properties. In this study, diglycidyl ether terminated polydimethylsiloxane is cured by 4,4′-dithiodibutyric acid which contains dual dynamic covalent disulfide and ester bonds with triazobicyclodecene as the ester exchange catalyst to prepare silicone rubber vitrimers (SRVs) through a casting method. The SRVs demonstrate a relatively higher intrinsic thermal conductivity of 0.26 W (m⁻ 1 K⁻ 1 ) compared to ≈0.20 W (m⁻ 1 K⁻ 1 ) of conventional silicone rubber. Besides, the SRVs exhibit very low and stable dielectric constant and dielectric loss at both low and high frequencies (X-band). The lowest dielectric constant and dielectric loss tangent at 10 GHz are 2.75 and 0.0650, respectively. Besides, the dual dynamic covalent bonds enable the SRVs to have excellent reprocessability and fast degradability. Moreover, the SRVs reveal UV-shielding capability, as the transmittance of the SRVs is 0% from 200 to 400 nm of UV light.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 20
·6736
·
IF 3.4
Jianan Song,Yicheng Fan,Anjun Shi
Effective thermal management and electromagnetic shielding have emerged as critical goals in contemporary electronic device development. However, effectively improving the thermal conductivity and electromagnetic shielding performance of polymer composites in multiple directions continues to pose significant challenges. In this work, inspired by the efficiency of interchange bridges in enabling vehicles to pass quickly in multiple directions, we employed a straightforward method to fabricate bidirectionally oriented carbon fiber (CF)/silicone rubber composites with an interchange-bridge-like structure. The high aspect ratio of CFs and their bidirectional orientation structure play a pivotal role in facilitating the formation of thermal and electrical pathways within the composites. Meanwhile, the bidirectionally oriented CF/silicone rubber composites showed a significant enhancement in tensile strength in both the vertical and horizontal directions, attributed to the cross-arrangement of CF arrays within the composites. At a filler content of 62.3 wt%, the bidirectionally oriented CF/silicone rubber composites had a high tensile strength of 6.18 MPa. The composites also exhibited an excellent thermal conductivity of 25.3 W/(m·K) and a remarkable electromagnetic interference shielding effectiveness of 61.6 dB. The bidirectionally oriented CF/silicone rubber composites show potential for addressing thermal management and electromagnetic shielding issues in electronic devices.Keywords:orientation;carbon fiber;thermal conductivity;electromagnetic interference shielding
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Jing Chen,Xu Liu,Xiao Liang Zeng,Huai Yu Ye,Guo Qi Zhang
Hexagonal boron nitride (BN) is often used as filler to improve the thermal conductivity of polymer matrix due to its high thermal conductivity. However, previously reported BN-based composites always have a high in-plane thermal conductivity, which is not beneficial for vertical heat dissipation. In addition, high BN content results in the deterioration of the mechanical properties. Here, we report a feasible method to prepare a BN/silicone rubber (SiR) composite with oriented BN in organosilicon matrix via a vacuum-assisted self-assembly technique. The BN/SiR composite displays a 1270% higher (2.74 W/(m·K)) thermal conductivity than that of neat organosilicon matrix (0.20 W/(m·K)). The oriented BN nanosheets increase the polymer's adhesive force and exhibit excellent compression cycle performance. In turn, these features support its superiority as thermal interface material in the light-emitting diode chips heat dissipation application.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
Heliyon
·
2023
·
IF 4
Yuanyuan An,Cuifang Lu,Mengmeng You,Xinshuo Liu,Wenqiang Yao,Yitao Li
Prior to crosslinking and vulcanization, fluorosilicone rubber is a linear polymer. This linear polymer contains 3,3,3,-trifluoropropyl methyl siloxane links, a few methyl vinyl siloxane links, and is formed by co-polymerization of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) cyclotrisiloxane (D 3 F) with 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (V 4 ) under alkaline conditions. To improve the performance of fluorosilicone rubber, three key points should be considered during the synthesis of vinyl-containing high-molecular-weight linear fluorosilicone polymers (fluorosilicone raw rubber): first, avoid the generation of low molecular weight equilibrium by-products; second, eliminate the influence of impurities; and third, increase the copolymerization participation rate of monomer V 4 . From the three aspects above, this study optimized the reaction conditions for the synthesis of high-molecular-weight linear fluorosilicone polymers containing vinyl. Various factors influencing polymerization were thoroughly investigated. These factors include the initiation system, accelerator, equilibrium reaction, feeding ratio, feeding sequence, neutralization mode, impurity content, etc.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 3
·035306
·
IF 1.62
Jiwan Ding,Ruobing Zheng,Yajie Zhang,Xian Zhang,Gang Liu,Kang Zheng
Silicone rubber (SR) composites filled with silicone rubber particles (SRP) and functionalized h-BN platelets were successfully prepared, which have high thermal conductivities and flexibility. The functionalization of h-BN adopts the combination of non-covalent and covalent modification. The Non-covalent functionalization of poly(dopamine) (PDA), which is deposited on the surface of h-BN platelets, improves the interfacial adhesion for grafting (3-aminopropyl) triethoxy-silan (KH550) by covalent modification (BN-PDA-KH550). To construct the thermal conductive pathway, silicone rubber particles are added. so that the fillers can distribute along the particle circumference by volume exclusion, which is advantageous for improving heat conduction of SR composites. The as-prepared 30 vol% BN-PDA-KH550@silicone rubber particles/silicone rubber composites (m-BN@SRP/SR) exhibited a relatively high thermal conductivity (2.24 W m−1·K−1), which is about 112 times of pure SR (0.20 W m−1·K−1). Besides, the m-BN@SRP/SR composites possessed satisfactory softness and excellent dielectric properties, which presented a broad application prospect in the field of electronic packaging.
研究领域:
材料科学
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热管理技术
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 13
·e202405461
·
IF 2
Shipeng Yuan,Peilong Jiang,Guiyou Zhu,Jianwei Guo
Graphical The ligands L1 – L3 were obtained by transesterification of three alkynyl alcohols with triisopropyl phosphite and complexed with Karstedt's catalyst to investigate the effect of catalysts on the curing of one-component silicone rubber. The test results showed that the catalyst synthesized by ligand L2 was the most effective. When added to one-component silicone rubber, the silicone rubber cured at 120 C for 6 min and at 150 C for 142 s. It could be stored at room temperature for more than 30 days and at 50 °C for 24 h. The thermal stability and mechanical properties of the silicone rubber are not affected by the catalyst and are enhanced. The development of wide-range temperature-stabilized catalysts for one-component silicone rubber is challenging because the high room temperature activity of Karstedt's catalyst greatly diminishes the storage stability period of one-component silicone rubber. In this work, three catalyst ligands were constructed based on a transesterification reaction between alkynyl alcohols and phosphite, then were complexed with Karstedt's catalyst. The results of research and testing showed that the platinum-alkynyl phosphite catalysts have better room temperature stability, in which the catalyst synthesized with the ligand tris(trimethyldodecynyl) phosphite ( L2 ) enabled the silicone rubber to be stored at room temperature for more than 30 days and cured rapidly at 120 °C. Adding this catalyst not only preserved the original performance properties of silicone rubber but also enhanced its thermal stability and mechanical properties. The ligand acted as a substituent to complex with Karstedt's catalyst to inhibit its activity, thus solving the problem of poor storage stability of one-component silicone rubber at room temperature.
研究领域:
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
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Daohang Cai,Yanhao Yu
Integrating silicone rubbers with carbon-based elastomers is a common practice in assembling stretchable electronics, but weak or rigid interfacial linkages often lead to structural failure under deformation. Here, we present a chemical and topological adhesive (CTA) composed of poly(styrene-isobutylene-styrene) (SIBS) and maleic anhydride-grafted polypropylene (PP-g-MAH) to bridge silicone rubbers and carbon-based elastomers. The CTA synergizes covalent bonding (via amine-anhydride reactions) with topological entanglement (enabled by matched chain reptation), achieves interfacial toughness >200 J m-2 through finger-pressing and can be further increased to >600 J m-2 via hot pressing. The adhered interface can endure 10,000 cycles of 100% stretch and 10 days of exposure to acidic/alkaline solutions (pH 1–13). The CTA applies to various silicone rubbers (e.g., PDMS and Ecoflex) and carbon-based elastomers (e.g., SEBS, SIBS, and SBS). This adhesion strategy significantly increases the interfacial toughness of stretchable devices in practical usage, offering a general solution for deformation-tolerant integration of stretchable electronics.
研究领域:
材料科学
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柔性电子器件
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yujie Jiang,Cancai Wang,Zhi Liu,Minghao Zhang,Jiayi Zhang,Qian Liu,Dejin Zhang,Yuetao Liu
At present, silicone superhydrophobic coatings are attracting much attention in the fields of anti-corrosion and antifouling, so they have a broad application prospect. In this paper, superhydrophobic surfaces with continuous micro/nano structure were prepared on various substrates using a simple blending method similar to the conventional preparation of RT vulcanized silicone rubber. The difference was that the new kinds of crosslinker (MF-S) was synthesized by 3-glycidyloxypropyltrimethocysilane and 3-aminopropyltriethoxysilane. Linear fluorinated copolymer (L-SF) was prepared by free radical polymerization of 3-mercaptopropyltriethoxysilane (MPTES) and 1H, 1H, 7H-dodecafluoroheptyl methacrylate (DFMA). And the condensation reaction with α, ω-dihydroxypodimethylsiloxane (PDMS), tetraethyl orthosilicate (TEOS), and inorganic nanoparticles constructed superhydrophobic coatings with continuous micro- and nanostructures. The coating had a water contact angle (WCA) of up to 162° and a sliding angle (SA) as low as 2°. What's more, the WCA of the coating remained around 160° and the SA stayed below 5° after sandpaper abrasion, UV irradiation, and hot and cold treatment. The adhesion of the coating on different substrates was higher than 2 MPa. Due to the synergistic effect of the superhydrophobicity of the coating and the photocatalytic activity of the TiO 2 nanoparticles , the coating achieves an antimicrobial efficiency of 97.8 % against Staphylococcus aureus . The synergistic effect of the air layer and the densification of the coating resulted in the electrical impedance modulus at the lowest frequency of the coating remaining two orders of magnitude higher than that of the bare carbon steel plate after several days of immersion in sodium chloride solution. The work showed great potential for application in anti-corrosion and anti-fouling coatings.
研究领域:
材料科学
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表面工程
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化学工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yijie Liu,Jintang Zhou,Zuolong Ning,Hexia Huang,Zhenyu Cheng,Lvtong Duan,Yucheng Wang,Xuewei Tao,Peijiang Liu,Yao Ma,Zhengjun Yao
In order to ensure the operation and longevity of electronic devices, the design of multifunctional composites integrating microwave absorption (MA) and thermal conduction has become the key to solving the problem. However, the superior MA properties and thermal conductivity are usually incompatible in the blend system. In this study, a modified carbon fiber/silicone rubber-oriented structure is designed based on the multiscale design concept of heterostructures with multiple interfaces. The forward deposition-reverse growth mechanism is utilized at the microscopic level to construct multi-interfacial heterogeneous structures on the surface of 1D carbon fibers (CFs). The magneto-electric coupling network of the multi-interfacial heterostructure induces interfacial polarization and enhances MA properties and heat transfer. Subsequently, the structural design of the modified CFs is carried out on a macroscopic scale using the ice template method. The directionally aligned modified CFs/silicone rubber aerogel composites are obtained by backfilling with silicone rubber (SR). The samples achieved an effective absorption bandwidth of 4.41 GHz and a maximum reflection loss of −42.29 dB with ultra-thin thickness (1.3 mm). The thermal conductivity of the sample is improved to 200% compared to pure silicone rubber. The composites with directional alignment have promising applications in lightweight and flexible electronic packaging.
研究领域:
材料科学
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电子工程
✓ 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）