PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Jingyu Xu,Yuhong Qi,Zhanping Zhang
Fluorosilicone polymers with a high fluorinated group content are shielded from their interactions with crosslinking agents and solvents by their closely arranged fluorinated groups on their surface. Herein, a series of poly(dimethyl-methylphenyl-methyltrifluoropropyl)siloxanes (PDPFSs) were synthesized using the hydrolysis–polycondensation method to reduce the shielding effect of the fluorinated groups. Dimethyl dimethoxy silane, phenyl methyl dimethoxy silane, and 3,3,3-trifluoropropyl methyl dimethoxy silane (TFMDS) were the main raw materials. The chemical structure of PDPFS and the thermal stability, surface properties, mechanical properties, and antifouling properties of the PDPFS coating were characterized. When the TFMDS content increased from 0 to 40 wt%, the number average molecular weight of PDPFS decreased from 43,380 to 38,433 g/mol and the chemical crosslinking rate of the PDPFS coating decreased from 81.25 % to 68.09 %. An analysis of the surface properties of the PDPFS coating revealed a decrease in surface free energy from 24.22 to 13.19 mJ/m 2 and an increase in roughness from 0.013 to 0.048 μm. The mechanical properties were examined, indicating that the Young's modulus of the PDPFS coating increased from 0.10 to 0.46 MPa and the average molecular weight between crosslinking points increased from 24,795 to 3285 g/mol. Experimental results revealed that the anti-adhesion efficiency and removal efficiency of the PDPFS coatings was mainly related to the TFMDS content. The anti-adhesion efficiency and removal efficiency were proportional to roughness, Young's modulus, and crosslinking density and inversely proportional to number average molecular weight and surface free energy. Further analysis of the comprehensive antifouling ability of the PDPFS coatings revealed that the antifouling efficiency of the PDPFS coating gradually increased from 16.83 % to 62.12 % with increasing TFMDS content. However, the 3,3,3-trifluoropropyl group exhibited an adverse effect on the hydrolysis–polycondensation and crosslinking reactions when the TFMDS content exceeded 35 wt%. Hence, PDPFS with a TFMDS content of 35 wt% was selected for further research.
研究领域:
材料科学
·
表面化学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yue Wu,Yukai Wu,Shuting Zhang,Shusen Wei,Chen Jin,Yang Zhang,Hong Dong,Yanjiang Song,Zhirong Qu,Chuan Wu
Hexamethylcyclotrisiloxane was polymerized by non-equilibrium anion living polymerization initiated by lithium dimethylsilanol, and bridged with methyltrifluoropropyldichlorosilane to prepare methyltrifluoropropylsiloxy-bridged α, ω-dimethylsiloxy-terminated polydimethylsiloxane (DTFP), and then methyltrifluoropropylsiloxy-bridged α, ω-dimethylacryloxybutylsiloxy-terminated polydimethylsiloxane (DAFP) was prepared through hydroxyl protection, hydrosilylation, deprotection of trimethylsiloxyl groups and condensation reaction with acrylic acid. DAFP was mixed with α , ω -bis[dimethyl-[3-[2,2-bis(acryloyloxy)butoxy]propyl]silyl]-terminated PDMS oligomer (DBABP), a crosslinking density modifier, at a mass ratio of 70: 30, and then 2 parts of a photoinitiator consisting of 2-hydroxy-2-methyl-1-phenyl-1-propanone and diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide blended at a mass ratio of 1: 1 were added, and a cured film was prepared under UV light irradiation. The effects of initiator composition, UV irradiation time, and molecular weight of DAFP oligomers on the gelation yield, water absorption, water contact angle, thermal stability, and dielectric properties of the UV-cured products were investigated. These findings are significant as they contribute to the understanding of the synthesis and characteristics of new materials in the field of materials science and polymer chemistry. DAFP oligomers can be copolymerized with the DBABP oligomer within 25 s of UV irradiation. The sample (DAFP-2) with the best performance has a gelation yield of about 87 %, its T5% in nitrogen can reach 377.7 °C, its water absorption rate is as low as 0.85 %, and its surface water contact angle can reach 116°. Under 2 GHz conditions, the dielectric constant of the UV-cured PDMS film containing 2.61 % F element is 2.71, which is 9.1 % lower than that of the pure PDMS. Meanwhile, its dielectric loss is also significantly reduced.
研究领域:
材料科学
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聚合物化学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 14
·8338-8346
·
IF 3.108
Xi Diao,Yun Hu,Yinyun He,Feng Quan,Chaohai Wei
In this study, 3,3,3-trifluoropropyltrimethoxysilane was first used as a modification agent to synthesize a highly hydrophobic mesoporous silica, TFP-MCM-41, using a refluxing method. The adsorption properties of TFP-MCM-41 for dibutyl phthalate (DBP) were studied by comparing its properties with that of the n-propyl-functionalized form of MCM-41, P-MCM-41, which contains three C–H bonds at the end of the organic chain instead of C–F bonds as in 3,3,3-trifluoropropyltrimethoxysilane, and unmodified MCM-41. TFP-MCM-41 showed much stronger hydrophobicity, higher adsorption affinity and better selectivity for adsorption of DBP than either P-MCM-41 or MCM-41. TFP-MCM-41 could preferentially uptake DBP from an aqueous solution containing a trace of DBP and large amounts of phenol. The excellent adsorption affinity and selectivity for DBP displayed by TFP-MCM-41 were ascribed to the hydrophobic and hydrogen bond interactions between the 3,3,3-trifluoropropyl groups and DBP molecules.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 30
·
IF 1.768
Chao Bian,Jinglin Tan,Depeng Ma,Yuling Li,Jie Zhang
The blending of polymethyltrifluoropropylsilicone-modified acrylonitrile–butadiene rubber (MNBR) and fluorosilicon rubber (FSR) at 70 : 30 ratio was investigated. The grafting of mercapto-functionalized polymethyltrifluoropropylsilicone onto acrylonitrile-butadiene rubber (NBR) by thiol-ene reaction was carried out with 2,2′-azobisisobutyronitrile as initiator in a Haake torque rheometer. The rheological properties of NBR grafting obtained at varying dosages of polymethyltrifluoropropylsilicone in a Haake torque rheometer were studied using torque curves. Grafting reaction was confirmed by 1 H nuclear magnetic resonance and energy-dispersive X-ray spectroscopy. Results of scanning electron microscopy and dynamic mechanical analysis showed better compatibility of MNBR/FSR blend than NBR/FSR reference blend. Meanwhile, the macro-mechanical properties of the blend significantly improved. The tensile strength and tear strength of MNBR/FSR blend were improved to 14.34 MPa and 44.94 KN/m, respectively, which were 2.92 MPa and 13.03 KN/m higher than those of NBR/FSR reference blend. The low-temperature brittleness of the blend was improved to −57°C, an increase of −6°C compared with that of NBR. These results indicated that MNBR/FSR blend at 70 : 30 ratio had improved compatibility because of the grafting chains that acted as interfacial agents. The low-temperature resistance of the blend was also enhanced. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42328.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2015
·Vol. 53
·期 8
·1023-1031
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IF 3.113
Hua-Feng Fei,Xiyin Gao,Xiaojie Han,Qian Wang,Tao Hu,Zhijie Zhang,Zemin Xie
Novel fluorine containing siloxane monomer, namely, 4-trifluoromethylphenylmethyl cyclosiloxane ( PF3 ) and mixed cyclosiloxane including both 4-trifluoromethylphenylmethyl siloxane ( P ) unit and trifluoropropyl siloxane ( F ) unit were successfully synthesized in this study. Furthermore, their series including vinyl-terminated copolymers with different compositions were synthesized. The microstructures of copolymers were investigated by 1 H NMR, 29 Si NMR, 19 F NMR, Fourier transform infrared spectroscopy, and differential scanning calorimetry (DSC). The results of characterizations confirmed that the copolymers exhibited random microstructure. Moreover, the analysis of the result of DSC also revealed that the copolymers had a low glass transition temperature. The thermogravimetric analysis indicated that poly(4-trifluoromethylphenylmethyl)siloxane ( PPF3 ) exhibited higher thermal stability than conventional fluorosilicones rubber ( FSR ). The dynamic mechanical analysis showed that the damping factors of these copolymers were greater than 0.3 in a wide range of temperature. The mass swelling ratios were less than 5.5% when the samples were immersed in No. 3 jet fuel for a month. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1023–1031
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yan Wang,Jiangxun Dou,Qingyuan Bian,Lifei Zhi,Zhiwang Han,Guoyong Wang
A series of polyether-modified fluorosilicone surfactants (FSiPEs) with different numbers of trifluoropropyl groups were synthesized in this paper, aiming to explore the constitutive law of pendant trifluoropropyl groups. The chemical compositions of the synthesized surfactants were characterized by FT-IR, 1H NMR, and 13C NMR. The physicochemical properties of the FSiPEs in aqueous and 75% ethanol solutions were systematically evaluated by transmission electron microscopy and equilibrium/dynamic surface tension, dynamic contact angle, foam scanning, and dynamic light scattering tests. The FSiPEs showed high surface activity in aqueous (γCAC = 28.86 mN/m) and 75% ethanol solutions (γCAC = 21.33 mN/m) along with excellent foaming properties and foam stability. Moreover, the FSiPEs showed good wetting properties on low-energy surfaces and could spontaneously assemble into vesicles in aqueous solution. The results of this study could guide future research on enhancing the scope of the applicability of trifluoropropyl-enhanced fluorosilicone surfactants.
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
POLYMER BULLETIN
·
2019
·Vol. 77
·期 6
·2855-2871
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IF 1.858
Zhang Yongjie,Fan Mingshuai,Li Xiaopei
Abstract Long-chain alkyl silicone is a type of modified silicones that finds potential applications in various areas. Long-chain alkyl fluorosilicone (LCAFS) can be considered as a modified long-chain alkyl silicone as it synergistically combines the properties of long-chain alkyl silicone and novel fluorosilicone. As far as we know, reports on the synthesis of LCAFS are rare. In this report, a facile method to synthesize LCAFS was explored. It was found that silicone bearing novel C30-45 alkyls and trifluoropropyl pendent groups, namely (C30-45 alkyl) methylsiloxane/trifluoropropylmethylsiloxane copolymer (TF-AMS), could be synthesized via a simple siloxane equilibration process between silanol-terminated polytrifluoropropylmethylsiloxane and (C30-45 alkyl)methyl silicone, a commercially available silicone that is generally considered as unreactive. The chemical structure of TF-AMS was characterized unambiguously by FTIR, NMR, GPC and DSC. The thermal stabilities of TF-AMS were investigated by TGA. Based on our experimental results, a plausible mechanism for the synthesis of TF-AMS was proposed. Graphic abstract A novel long-chain alkyl fluorosilicone was synthesized via a simple yet efficient siloxane equilibration process.
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 63
·39739-39747
·
IF 3.108
Huaijun Zhu,Zilin Dai,Weiping Tu
In order to overcome the defects of opacity, high gas permeability, poor heat and solvent oil resistance of methyl silicone rubber, optically transparent trifluoropropyl phenyl silicone rubber was prepared by introducing trifluoropropyl and phenyl to organic silicone molecules. Then organic polysilazane (OPSZ) was coated on the trifluoropropyl phenyl silicone rubber surface with tetramethylhexamethylenediamine as a catalyst and a dense coating with low gas permeability was achieved. This process realized low-temperature curing and siliceous transition. At the same time, optical performance, mechanical properties, oxygen permeation flux, and anti-sulfuration were measured. The results showed that the fluorine-containing phenyl silicone rubber had good optical transparency, tensile strength, elongation at break, tear strength, oil resistance and heat resistance. The OPSZ coating surface was continuous, uniform, dense and free of cracks and voids; meanwhile, the coating section was dense, uniform, seamless, without cracks. The interface between the coating and the silicone rubber exhibited good adhesion. Light transmission was over 92% between 400 and 800 nm. When the coating thickness was more than 12 μm, the oxygen permeation flux remained unchanged, lamps had good anti-sulfuration ability, and luminous flux was maintained at over 99.8%. when the mass fraction of tetramethyl hexamethylene diamine (w) was over 5%, siliceous transition was achieved under room temperature and 50% relative humidity for 24 h.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
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