Coatings
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2019
·Vol. 9
·期 10
·605
·
IF 2.33
Jianye Ji,Xin Ge,Weijie Liang,Xiaoyan Pang,Ruoling Liu,Shuyi Wen,Jiaqi Sun,Xunjun Chen,Jianfang Ge
To overcome the inherent limitation that the preparation of high molecular weight MQ copolymers (Mw ≥ 30,000 g/mol) via the hydrolysis and condensation of solicate salts generally results in an intractable gel, vinylphenyl-containing MQ silicone resin with a high molecular weight was designed and synthesized through the hydrosilylation reaction of vinyl-containing MQ silicone resin and linear poly(diphenylsiloxane) with two terminal Si–H bonds. The weight average molecular weight of these modified copolymers reported here is at least 30,000 dal·mol−1. These polymers have favorable thermal stability and a higher refractive index than that of the base resin due to the formation of novel regular macromolecular structures and the introduction of phenyl groups. These inorganic/organic hybrid materials could be used as a potential component for temperature-resistance electronics adhesive, heat-resistant coatings and high-performance liquid silicone rubber. Moreover, the proposed process also provides a possibility to choose higher molecular weight MQ silicones according to application requirements.Keywords:MQ silicone resin;modified;hydrosilylation;high molecular weight
研究领域:
材料科学
·
有机化学
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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
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化学工程
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产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2025
·
IF 5.1
Hailong Wang,Jialong Zhu,Haolan Gou,Wenyu Fang,Hong Fan
The demand for high-transparent functional coatings with excellent hardness and excellent anti-smudge properties has increased significantly, especially for display devices such as smartphones and tablets. In this work, epoxy MQ silicone resins with different epoxy values were synthesized by sol-gel method and hydrosilylation reaction, and then cured with methyl hexahydrophthalic anhydride to obtain an organic-inorganic hybrid coating with extraordinary transparency (99.3 % at 550 nm) and high hardness (0.21 GPa). By introducing fluorocarbon chains into MQ silicone resin, the surface energy of the coating is reduced from 31.9 ± 0.5 mJ/m 2 to 23.1 ± 0.3 mJ/m 2 and the water contact angle is increased from 84.0° to 107.9°, showing excellent self-cleaning properties while maintaining good mechanical properties (hardness, 0.19 GPa) and excellent transparency (98 % at 550 nm). Moreover, the coating could maintain its outstanding performance after 100 cycles of steel wool abrasion or heating at 60 °C for 60 h. Therefore, this work provides insights into the fabrication of multifunctional coatings integrated with high transparency, wear resistance, as well as anti-smudge properties for touch screens.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 9
·1389
·
IF 3.164
Jianye Ji,Xin Ge,Weijie Liang,Ruiyuan Liang,Xiaoyan Pang,Ruoling Liu,Shuyi Wen,Jiaqi Sun,Xunjun Chen,Jianfang Ge
MQ silicone resins represent a broad range of hydrolytic condensation products of monofunctional silane (M units) and tetrafunctional silane (Q units). In this work, a Bio-Phenol MQ silicone resin (BPMQ) was designed and synthesized by the hydrosilylation of hydrogen containing MQ silicone resin and eugenol in the presence of chloroplatinic acid. The structure, thermal property, and antibacterial property againstEscherichia coliof the modified MQ silicone resin were investigated. The results showed that BPMQ has been prepared successfully, and the thermal stability of this modified polymer improved significantly because of the introduction of phenyl in eugenol. The temperature at the maximum degradation rate increased from 250 °C to 422.5 °C, and the residual yields mass left at 600 °C were increased from 2.0% to 28.3%. In addition, its antibacterial property againstEscherichia coliwas also enhanced markedly without adding any other antimicrobial agents. This improved performance is ascribed to special functional groups in the structure of eugenol. The BPMQ polymer is expected to be applied to pressure-sensitive adhesives and silicone rubber products for the biomedical field due to its reinforcing effect and antioxidant quality.Keywords:Bio-Phenol MQ silicone resin;hydrosilylation;modified;thermal stability;antibacterial property
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 15
·47360
·
IF 1.901
Hongqiang Li,Yanping Li,Xuejun Lai,Hongwei Cao,Renxu Yuan,Xingrong Zeng
With the growing incidence of extreme climate and serious pollution, the capability to resist high-voltage arc discharge has been considered as one of crucial performances for silicone rubber in the field of electrical power. Herein, to enhance the tracking and erosion resistance of addition-cure liquid silicone rubber (ALSR), a kind of ureido-attached vinyl MQ silicone resin [hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q)] (U-VMQ) was synthesized. The chemical structure of U-VMQ was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the effects of U-VMQ on the mechanical properties, thermal stability, and tracking and erosion resistance of ALSR were investigated. The results showed that U-VMQ was beneficial for the improvement of mechanical properties and thermal stability of ALSR. With 2 phr of U-VMQ containing 2.5 wt % of vinyl content, the ALSR successfully passed the inclined plane tracking at 4.5 kV, and the electrical erosion rate was only 0.13%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47360.
研究领域:
材料科学
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电气工程
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化学工程
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 37
·5325-5336
·
IF 5.364
Jieyuan Zheng,Yuquan Cai,Yang Hu,Jialong Zhu,Jiao Wei,Yuanchuan Ma,Jintao Wan,Hong Fan
Conventional epoxy thermosets lack toughness, and conventional methods to toughen them are at the cost of decreasing other properties of the materials, such as the mechanical modulus, strength and transparency. Herein, hydrogenated MQ silicone resins (H–MQ) of various M/Q ratios, where M and Q denote R3SiO1/2 and SiO4/2, respectively, are synthesized from co-hydrolytic condensation of siloxane precursors. Then, these H–MQ resins are bonded with two epoxy monomers, bio-based eugenol glycidyl ether (EG) and allyl glycidyl ether (AG), through hydrosilylation to afford EG–MQ and AG–MQ, respectively, with tailored organic segments and M/Q ratios. The obtained epoxy-functionalized MQ silicone resins will have increased compatibility with the epoxy matrix. Compared with neat DGEBA thermosets, the addition of 20% EG-1.2MQ (M/Q ratio = 1.2 : 1) leads to marked increases in impact, tensile, and flexural strengths by 90%, 3%, and 3%, respectively, as well as increases in tensile and flexural strains by 55% and 100%. The epoxidized organic segments are found to be critical for enhancing the mechanical properties of the obtained epoxy composites. The EG–MQ/epoxy composites show better mechanical properties than AG–MQ/epoxy systems due to the improved compatibility of EG–MQ with DGEBA due to the aromatic EG moieties attached. Furthermore, the thermal stability and residual yield are increased by adding these silicone resins, with an increased water contact angle from 80 to as high as 110°. Our contribution provides a new avenue for integrating such good properties as impact toughness, mechanical properties, thermal stability and water repellance into the obtained epoxy thermosetting materials, without compromising the transparency.
研究领域:
材料科学
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高分子化学
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复合材料
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DOI
高影响因子
危险品化学品经营许可证（带存储）