Polymers
·
2022
·Vol. 14
·期 18
·3804
·
IF 4.967
Tong Wu,Yuhong Qi,Qi’an Chen,Chuanjun Gu,Zhanping Zhang
To improve the antifouling performance of silicone fouling-release coatings, some fluorosilicone and silicone fouling-release coatings were prepared and cured at room temperature with hydroxyl-terminated fluoropolysiloxane (FPS) or hydroxy-terminated polydimethylsiloxane (PDMS) as a film-forming resin, tetraethyl orthosilicate (TEOS) as a crosslinking agent, and dibutyltin dilaurate (DBTDL) as a catalyst. The chemical structure, surface morphology and roughness, tensile properties, and antifouling properties of the coating were studied by infrared spectroscopy, a laser confocal scanning microscope, contact angle measurement, tensile tests, and marine bacteria and benthic diatom attachment tests. The results showed that the FPS coatings were not only hydrophobic but also oleophobic, and the contact angles of the FPS coatings were larger than those of the PDMS coatings. The surface free energies of the FPS coatings were much lower than those of the PDMS coatings. Generally, the fluorine groups can improve the antifouling performance of the coating. Introducing nonreactive silicone oil into PDMS or FPS coatings can improve the antifouling performance of the coating to a certain extent. The prepared fluorosilicone fouling-release coatings showed good application prospects.Keywords:fluorosilicone;hydroxyl terminated fluoropolysiloxane;antifouling;silicone oil;coatings
研究领域:
材料科学
·
海洋生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Qi Yao,Hualin Chen,Henghui Huang,Bailing Liu
A combination chrome tanning technology which endows leather high chrome exhaustion and thermal property based on hydroxyl-terminated dendrimer (HTD) is reported. The chrome concentration in effluent, denaturation temperature (Td), enthalpy (ΔH), thermal degradation active energy (Ea), crosslinking degree of wet-blue leathers are determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES), differential scanning calorimetry (DSC), thermal gravimetry analysis (TG-DTG), and X-ray diffraction (XRD), respectively. The element (especially chromium) content and distribution of wet-blue leather are also obtained by scanning electron microscopy-energy dispersive spectrometer (SEM-EDS). The results show that the chrome uptake, Td, ΔH and Ea of wet-blue leather tanned with HTD and basic chrome sulphate (HTD-Cr) can reach 94.1%, 117.4 °C and 432.2 J/g, and 153.1 kJ/mol much higher than conventional chrome tanning which is 66.1%, 112.5 °C and 129.2 J/g and 147.2 kJ/mol, respectively. It is because HTD could act as excellent masking agent with good alkaline stability, which slows down the basifying process and promotes chrome penetration towards central of wet-blue leather, resulting in evenly dispersed along the grain layer, middle layer and flesh layer of wet-blue leather. Consequently, crosslinking density of collagen increased, thereby inhibiting the outward diffusion of chrome and improving the chrome uptake. In contrast, for blank trial, the chrome mainly aggregate at grain layer and flesh layer. These results illustrate the chrome tanning promotion mechanism of HTD and provide a valuable insight of developing high exhausted chrome agent based on dendrimer for more sustainable future of leather industry.
研究领域:
皮革化学与工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Yutong Xie,Xueyan Du,Qing Tian,Yuhua Dong,Qiong Zhou
Epoxy resin coatings are characterized by a high concentration of hydroxyl groups, making them inherently hydrophilic and prone to corrosion. Additionally, the brittleness of epoxy resin limits its practical uses. In this study, epoxy resin (EP-51) was modified using hydroxyl-terminated polydimethylsiloxane (HTPDMS), which possesses a low surface energy due to its -Si-O- bonds, to improve the hydrophobicity and toughness of the coating. The effect of varying HTPDMS concentrations on the properties of epoxy resin was evaluated in terms of mechanical, thermodynamic, and electrochemical properties , as well as contact angle measurements. The findings reveal that as the HTPDMS content increases, the tensile strength of the modified EP diminishes, while the elongation and impact strength are enhanced. However, higher HTPDMS levels lead to reduced compatibility with EP, causing phase separation and the formation of an “island structure”. The glass transition temperature of the EP declines with added HTPDMS, resulting in an increased swelling rate and reduced pencil hardness and adhesion grade of the coatings. Notably, the hydrophobicity of the EP improved significantly, with its contact angle rising from 74.8° to 99.0° post-modification. Electrochemical impedance spectroscopy and polarization curve analyses revealed optimal protective performance of the coating at an epoxy resin to HTPDMS mass ratio of 8:2.
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
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 6
·2100692
·
IF 5.006
Yongkai Zhao,Tao Shou,Siwei Fu,Xuan Qin,Shikai Hu,Xiuying Zhao,Liqun Zhang
Vibration and noise are ubiquitous in social life, which severely damage machinery and adversely affect human health. Thus, the development of materials with high-damping performance is of great importance. Rubbers are typically used as damping materials because of their unique viscoelasticity. However, they do not satisfy the requirements of different applications with various working conditions. In this study, the advantages of the high loss factor of styrene butadiene rubber (SBR) are combined with the strong designability of polyurethane. Hydroxyl-terminated solution-polymerized styrene butadiene rubbers (HTSSBRs) with different structures are prepared using anionic polymerization. HTSSBRs are then used as the soft segment during the synthesis of temperature-tunable high-damping performance polyurethanes (HTSSBR-polyurethanes (PUs)). The prepared HTSSBR-PUs with different structures exhibit excellent loss performance, a maximum loss factor (tan δ max ) of above 1.60, and an effective damping performance over a wide temperature range compared to traditional SBR and polyurethane. Therefore, this work offers an effective method for the design of damping materials with adjustable properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Bo Lv,Keheng Pan,Yuanyuan Zuo,Zhaoxia Liu,Junjie Tan,Hongye Yan,Yu Zhou,Hongxiang Chen,Minghua Yang
Rubber as a substrate exhibits very different surface physical and chemical characteristics from steel. It still remains challenging to achieve a complete interface stripping of steel while maintaining double-sided adhesion between rubber and steel. Hydroxyl-terminated polybutadiene (HTPB) possesses remarkable low-temperature flexibility that contributes to migration and orientation of molecular chains, and contains abundant C = C bonds that facilitate cross-linking reaction. In this work, the hydroxyethyl acrylate (HEA)-terminated waterborne polyurethane (WPUH) adhesive was prepared by introducing HTPB into polyurethane backbone. The impact of HTPB on the properties of WPUH adhesive was investigated by changing HTPB/poly(tetramethylene ether) glycol (PTMG) molar ratio. The reasons for such change were studied focusing on the structure and bonding mechanism of WPUH adhesive. When rubber and steel were bonded together by WPUH adhesive, the rubber would induce non-polar HTPB segments to approach the bonding interface while the steel would attract the polar carbamate groups to its surface. The adhesion was strengthened by the interfacial interaction once WPUH adhesive wetted two substrates. In addition, the 1,2-isomer C = C bonds of HTPB could undergo free radical polymerization with HEA to form a cross-linked network, which improved the cohesion. This study provides a feasible strategy for achieving the goal of effectively bonding rubber-to-steel without residual adhesive stripping.
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
·
2024
·Vol. 16
·期 16
·2246
·
IF 4.7
Wu Yang,Zhengmao Ding,Cong Zhu,Tianqi Li,Wenhao Liu,Yunjun Luo
In order to determine the curing reaction model and corresponding parameters of hydroxyl-terminated block copolyether (HTPE) and provide a theoretical reference for its practical application, the non-isothermal differential scanning calorimetry (DSC) method was used to analyze the curing processes of three curing systems with HTPE and N-100 (an aliphatic polyisocyanate curing agent), isophorone diisocyanate (IPDI), and a mixture of N-100 and IPDI as curing agents. The results show that the curing activation energy of N-100 and HTPE was about 69.37 kJ/mol, slightly lower than the curing activation energy of IPDI and HTPE (75.60 kJ/mol), and the curing activation energy of the mixed curing agent and HTPE was 69.79 kJ/mol. The curing process of HTPE conformed to the autocatalytic reaction model. The non-catalytic reaction order (n) of N-100 and HTPE was about 1.2, and the autocatalytic order (m) was about 0.3, both lower than those of IPDI and HTPE. The reaction kinetics parameters of the N-100 and IPDI mixed curing agent with HTPE were close to those of N-100 and HTPE. The verification results indicate a high degree of overlap between the experimental data and the calculated data.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Qinglong Luo,Yinqiu Wang,Liang Li,Xueli Huang,Zhongfu Cheng,Xueying Wang,Long He
Environmental boron removal and salt lake brine boron enrichment are important separation processes, which are of great significance to animal and plant health, environmental safety, and effective use of resources. Polymers are often used for boron separation due to their low cost and high performance. In this study, Tris(hydroxymethyl)methyl aminomethane (TRIS) and glucose functionalized polymer (P(GMA-co-TRIM)) were synthesized by hydrothermal method , and the polymer structure were characterized by FTIR, SEM, Mapping, XRD , XPS, PZC and TG-DSC-DTG. P(GMA-co-TRIM)-TRIS and P(GMA-co-TRIM)-Glu were used as boron adsorbents and the performance test were carried out. When the pH = 8 of boron solution, the two adsorbents have the best adsorption performance, with the adsorption capacity of 16.25 and 18.09 mg/g, respectively. The effects of initial concentration and contact time on boron adsorption were studied. Langmuir adsorption isothermal model and pseudo-second-order model were more consistent with the adsorption data, and the adsorption process was chemical adsorption . The two adsorbents have strong resistance to ion interference and cycle life, and have potential application value in environmental boron removal and boron extraction from salt lake.
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
Polymers
·
2017
·Vol. 9
·期 6
·200
·
IF 3.364
Chuyao Liang,Jie Li,Min Xia,Guoping Li,Yunjun Luo
Based on the Diels–Alder reaction and hydroxyl-terminated polybutadiene (HTPB) binders of solid propellants, two novel compounds—furfuryl-terminated polybutadiene (FTPB) and trifurfuryl propane (TFP)—were designed and synthesized, and their structures were characterized. A new kind of reversible Diels–Alder reaction system was formed by FTPB as main resin,N,N′-1,3-phenylenedimaleimide (PDMI) as curing agent and TFP as chain extender. The results showed that this system had good mechanical properties with a tensile strength of 1.76 MPa and a tensile strain of 284% after curing, and the repair efficiency of the crack was 88%. Therefore, it could be used as a novel binder of energetic materials such as solid propellant and PBX explosives to provide them with self-repairing characteristics and improve the reliability for application.Keywords:Diels–Alder reaction;hydroxyl-terminated polybutadiene;binder;self-repairing;solid propellant
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Jiawei Li,Zhao Ning,Weiming Yang,Bin Yang,Yanning Zeng
Hydroxyl-terminated polybutadiene (HTPB)-based polyurethane (PU) networks play indispensable roles in a variety of applications; however, they cannot be reprocessed, resulting in environmental problems and unsustainable industrial development. In this work, recyclable HTPB-based PU vitrimer (HTPB-PUV) networks are fabricated by introduction of a cross-linker 2,2′-(1,4-phenylene)-bis[4-mercaptan-1,3,2-dioxaborolane] (BDB) with dynamic boronic ester bonds into the network. Meanwhile, the BDB can stabilize the HTPB unit in the network by elimination of double bonds. The novel HTPB-PUV networks are constructed by a thiol-ene “click” reaction and an addition reaction between HTPB and cross-linker BDB and isocyanates (HDI). The dynamic HTPB-PUV networks are characterized by dynamic mechanical analysis (DMA) and Fourier transform infrared (FTIR). The obtained dynamic HTPB-PUV networks possess superior thermostability. Moreover, due to the presence of dynamic boronic ester bonds, the HTPB-PUV network topologies can be altered, contributing to the reprocessing, self-healing, and welding abilities of the final polymer. Through a hot press, the pulverized sample can be reprocessed for several cycles, and mechanical properties of the reprocessed samples are similar to those of the pristine one, with the tensile strength being even higher. The self-healed sample exhibits almost complete recovery from scratch after the healing treatment at 130 °C for 3 h. Moreover, a welding efficiency of 120% was achieved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Yuqin Zheng,Gang Chen,Hailin Shan,Jiarong He,Jiaheng Lei
By the esterification of benzoic anhydride (BA) with polyoxyethylene ether (HPEG), the modified macromonomer (BA-HPEG) with benzoate of HPEG was prepared. Then, BA-HPEG and HPEG were copolymerized with acrylic acid (AA) with an alkyd ratio of 2:1 to obtain three novel polycarboxylate superplasticizer BA-PCE-10, BA-PCE-20 and BA-PCE-30 with good flow retaining behaviors of cement mortars. The effects of the benzoate content in the copolymers on adsorption, dispersion, Zeta potential and hydrodynamic radius for cement suspensions were investigated to elucidate the governing dispersing mechanism. The absorption of the modified copolymers on the cement surfaces was controlled by COO― and hydrophobic phenyl content in copolymers and polymer conformation in solution. The fluidity of cement slurry increases with the adsorbed amount to increase dispersion effect. The copolymers grafted with benzoate exhibited a high dispersion performance than that of the unmodified molecule, which could be explained as the hydrophobic modified polycarboxylate superplasticizer mainly dispersing cement particles by the main repulsion of steric hindrance and electrostatic repulsion, so as to improve the dispersion performance of cement. The study shows that the flow retaining behaviors of polycarboxylate superplasticizer can be significantly improved by BA modified with hydroxyl-terminated of the side chains of polycarboxylic superplasticizer.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 5
·895
·
IF 3.164
Xiuzhong Zhu,Xiao Duan,Ting Bai,Xuan Zhang,Tong Wang,Tao Cao,Xiaodong Fan
In this study, a new pH-tunable thermoresponsive hydroxyl-terminated hyperbranched polyether (HTHP 2) was successfully prepared via a one-pot cationic polymerization technique and postmodification. In the first step, hydroxyl-terminated hyperbranched polyether containing double bonds (HTHP 1) were synthesized. Then, through thiol-ene “click” reaction, pH-responsive carboxyl groups were introduced to the target polymer of HTHP 2. The products were characterized via Fourier-transform infrared spectra (FTIR), nuclear magnetic resonance (NMR), and size-exclusion chromatography-multiangle laser light scattering (SEC-MALLS). Moreover, dynamic light scattering (DLS) and UV–Vis spectroscopy was employed to study the pH- and thermoresponsiveness in detail. Results showed that HTHP 2 possessed typical pH-controllable thermoresponsive behavior. By regulating the solution pH value range 3.0–5.4, LCST of HTHP 2 could be changed from 12.8 to 68.0 °C. Meanwhile, the cell viabilities of A549 cells were more than 80% for in vitro cytotoxicity tests of HTHP 2, suggested that HTHP 2 polymers are of good biocompatibility for up to 24 h.Keywords:hydroxyl-terminated hyperbranched polyether;cationic polymerization;thiol-ene “click” reaction;widely tunable LCST
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·994-1003
·
IF 3.603
Zhang Wan-Bin,Luo Jie,Wang Yan-Meng,Zhu Xiu-Zhong,Zhang Ce,Liu Jing,Ni Mei-Le,Zhang Guang-Hua
A series of hydroxyl-terminated polyethylenes (HTPE) bearing various functional side groups ( e.g. carboxyl, ester and butane groups) were synthesized by the combination of ring-opening metathesis polymerization (ROMP) and visible light photocatalytic thiol-ene reaction. The products are named as α, ω -dihydroxyl-poly[(propionyloxythio)methinetrimethylene] (HTPE carboxyl ), α, ω -dihydroxyl-poly[(methylpropionatethio) methinetrimethylene] (HTPE ester ) and α, ω -dihydroxyl-poly[(butylthio) methinetrimethylene] (HTPE butane ), respectively. The investigation of ROMP indicated that the molecular weight of resultant hydroxyl-terminated polybutadiene (HTPB) can be tailored by varying the feed ratios of monomer to chain transfer agent (CTA). The exploration of the photocatalytic thiol-ene reaction between HTPB precursor and methyl 3-mercaptopropionate revealed that blue light as well as oxygen accelerated the reaction. 1 H-NMR and 13 C-NMR results verified all the double bonds in HTPB can be modified, and the main chain of resultant polymer can be considered as polyethylene. Subsequently, relationship between the structure of side groups and the thermal properties of functional PEs was studied. And the results suggested that the T g was in the order of HTPE butane
研究领域:
高分子化学
·
材料科学
✓ 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）