Polymers
·
2023
·Vol. 15
·期 10
·2385
·
IF 5
Huimin Qi,Yang Lei,Xuemei Lei,Ding Zhang,Yafeng Zhang,Jiaxin Yu,Baogang Guo
Polyimide-bearing retainer has been successfully used in space environment. However, the structural damage of polyimide induced by space irradiation limits its wide use. In order to further improve the atomic oxygen resistance of polyimide and comprehensively investigate the tribological mechanism of polyimide composites exposed in simulate space environment, 3-amino-polyhedral oligomeric silsesquioxane (NH2-POSS) was incorporated into a polyimide molecular chain and silica (SiO2) nanoparticles were in situ added into polyimide matrix and the combined effect of vacuum environment, and atomic oxygen (AO) on the tribological performance of polyimide was studied using bearing steel as the counterpart by a ball on disk tribometer. XPS analysis demonstrated the formation of protective layer induced by AO. The wear resistance of polyimide after modification was enhanced under AO attack. FIB-TEM confirmed that the inert protective layer of Si was formed on the counterpart during the sliding process. Mechanisms behind this are discussed based on the systematic characterization of worn surfaces of the samples and the tribofilms formed on the counterbody.Keywords:polyimide;NH2-POSS;tribological properties;atomic oxygen;tribofilm
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6542-6548
·
IF 7.443
Shaolei Wang,Liangxiao Tan,Chengxin Zhang,Irshad Hussain,Bien Tan
Two kinds of POSS-based organic–inorganic hybrid porous materials have been synthesized via Friedel–Crafts and Scholl coupling reactions, for the first time, using low-cost building blocks i.e., octaphenylsilsesquioxanes and simple knitting approaches to obtain high Brunauer–Emmett–Teller (BET) surface area porous polyhedral oligomeric silsesquioxane (POSS)-based hybrid materials. N2 sorption isotherms of the polymers show that both these materials are predominantly microporous and mesoporous with BET surface areas of 795 m2 g−1 for the polymer of octaphenylsilsesquioxanes-1 (POPS-1) and 472 m2 g−1 for the polymer of octaphenylsilsesquioxanes-2 (POPS-2). Moreover, POPS-1 can reversibly adsorb 9.73 wt% CO2 (1 bar and 273 K) and 0.89 wt% H2 (1.13 bar and 77 K), and POPS-2 shows moderate gas uptake with 8.12 wt% CO2 (1 bar and 273 K) and 0.64 wt% H2 (1.13 bar and 77 K). In addition, the structural integrity of POSS based building blocks was completely preserved under relatively strong acidic conditions.
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 FOR ADVANCED TECHNOLOGIES
·
2011
·Vol. 23
·期 4
·765-775
·
IF 1.776
Hualun Cai,Xiuju Zhang,Kai Xu,Huan Liu,Jiangxun Su,Xin Liu,Zien Fu,Ying Guo,Mingcai Chen
Octaphenylsilsesquioxane (PH-POSS) and octa(γ-methacryloxypropyl)silsesquioxane (MA-POSS) were successfully synthesized by hydrolytic condensation of phenyltrichlorosilane and γ-methacryloxypropyltrimethoxysilane, and characterized by Fourier transform infrared (FT-IR), 1 H and 29 Si nuclear magnetic resonance (NMR), and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrum. Morphology, degradation behavior, thermal, and mechanical properties of hybrid composites were studied by transmission electron microscopy (TEM), polarized optical microscopy (POM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), surface contact angle (SCA), tensile, and impact testing. Domains of PH-POSS and MA-POSS dispersed in the matrix with a wide size distribution in a range of 0.1–0.5 µm, while PH-POSS exhibited a preferential dispersion. Because of the possible homopolymerization of MA-POSS during the melt blending, the glass transition temperature of polycarbonate (PC)/MA-POSS composites remained nearly unchanged with respect to PC/PH-POSS composites that showed a depression of T g due to the plasticization effect. It is interesting to note that the incorporation of POSS retarded the degradation rates of PC composites and thus significantly improved the thermal stabilities. Si O fractions left during POSS degradations were a key factor governing the formation of a gel network layer on the exterior surface. This layer possessed more compact structures, higher thermal stabilities, and some thermal insulation. In addition, percentage residues at 700°C ( C 700 ) significantly increased from 10.8% to 15.8–22.1% in air. Fracture stress of two composites showed a slight improvement, and the impact strength of them decreased monotonically with the increase of POSS loading. Copyright © 2011 John Wiley & Sons, Ltd.
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
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Chao-Hua Xue,Qian-Qian Fan,Xiao-Jing Guo,Qiu-Feng An,Shun-Tian Jia
Superhydrophobic fabrics were successfully prepared by modification of fibers with polymers containing polyhedral oligomeric silsesquioxane (POSS). The modification was conducted by chemical vapor deposition with mercapto silanes followed by click coupling with pentaerythritol tetrakis(3-mercaptopropionate) and octavinyl-POSS to form POSS-based polymers on the cotton fibers. The POSS-based polymers onto the fabric surfaces both increased the surface roughness and lowered the surface energy of the fabrics. The as-prepared superhydrophobic fabrics have excellent superhydrophobicity stability toward acid, base, salt, acetone, and N,N-dimethylformamide. In addition, the fabrics maintained superhydrophobicity under long time exposure to UV irradiation, and have better antifouling properties.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 304
·期 12
·1900505
·
IF 3.038
Chao Huang,Jinhui Li,Guangxia Xie,Fei Han,Dongxu Huang,Fan Zhang,Bo Zhang,Guoping Zhang,Rong Sun,Ching-Ping Wong
With the rapid development of ultra large scale integrated circuits, low stress, low thermal expansion, low dielectric constant, and low temperature curable (<250 °C) polyimides (PIs) with excellent mechanical, thermal properties are required. Unfortunately, high curing temperatures above 300 °C and limited dielectric property still remain to be solved. Herein, a new type of aminopropyl isobutyl polysilsesquioxane (POSS) with single vertex activity is introduced by in situ polymerization resulting in the PI-POSS nanocomposites which exhibit a low dielectric constant (κ ≤ 2.6). Furthermore, low-temperature curing at 200 °C (99.4% imidization) under the catalysis of quinoline is also achieved. The as-prepared PI-POSS nanocomposites also show excellent mechanical properties of which the tensile strength can reach up to 148 MPa and the elongation at break achieves 98%. Moreover, the temperature of weight loss 5% is as high as 550 °C and the glass transition temperature can also reach 349 °C. The as-prepared PI-POSS nanocomposites prove excellent electrical performance and mechanical properties, showing a huge market prospect of 5G chip packaging and millimeter wave antenna in the future.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Kaiqiang Zhang,Xiaohui Li,Yunhui Zhao,Kongying Zhu,Yancai Li,Chao Tao,Xiaoyan Yuan
Low surface energy materials have been extensively investigated for building icephobic surfaces in recent years. Polydimethylsiloxane (PDMS) and fluoropolymers have been introduced to this field, while control of their structures is of importance to produce deicing surfaces. In this work, fluorinated methacrylate block copolymers containing polyhedral oligomeric silsesquioxane (POSS) moieties were synthesized by reversible addition-fragmentation chain transfer polymerization and transformed into thiolated-copolymers by aminolysis to adjust the self-assembly and modify surface morphology. The icephobic coatings were developed via UV-curable thiol-ene reaction with tunable amounts of thiol-modified POSS-fluorinated methacrylate diblock copolymers with vinyl-functionalized PDMS and thiol-functionalized PDMS. Characterizations of atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle showed the evidence of the POSS-fluorinated diblock copolymers on the outmost surface of the coatings. Owing to the crystallization of perfluoroalkyl side groups, the coatings containing thiol-modified poly(methacrylisobutyl POSS)- b -poly(2-perfluorooctylethyl methacrylate) ( S17F ) exhibited excellent icephobicity, and water droplets could rebound completely on all S17F -containing surfaces at both normal and tilt modes before freeze even at −15 °C. The ice shear strengths of the prepared UV-cured coatings were about one-eighth of that on bare aluminum surface, while the coating containing 5% S17F achieved the lowest ice shear strength of 105 ± 12 kPa. It was found that the icephobicity of these coatings were attributed primarily to the synergistic effect of the POSS-fluorinated methacrylate diblock copolymer and the PDMS component.
研究领域:
材料科学
·
表面化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 16
·11980-11988
·
IF 3.84
Guanghe Song,Xuesong Li,Qiyang Jiang,Jianxin Mu,Zhenhua Jiang
A series of novel structural phosphorus-containing polyimide–polyhedral oligomeric silsesquioxane (POSS) nanocomposites with varying phosphorus contents were synthesized. The nanocomposites displayed outstanding thermal properties. The glass transition temperature was increased to 294.87 °C when the phosphorus content was 1.61 wt% and the anti-degradation properties were also obviously enhanced. Moreover, the nanocomposites presented much higher atomic oxygen (AO) durability compared with pure polyimide because of the incorporation of special functional groups of phosphorus oxide and POSS. The AO erosion yields decreased to 51.9% of pure polyimide–POSS nanocomposites when the phosphorus content was increased to 1.61 wt%. Furthermore, the mechanism of phosphorus and POSS synergistic AO resistance was explored via XPS and SEM. Three kinds of silicon particles with different binding energies and two kinds of phosphorus elements with different binding energies were formed because of AO exposure and the phosphorus and POSS synergy. Highly effective self-passivating layers were formed to protect the underlying material from AO attack.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 34
·12753-12760
·
IF 5.101
Aifang Luo,Xuesong Jiang,Hong Lin,Jie Yin
We demonstrate here a series of hybrid materials based on thiol-contained polyhedral oligomeric silsesquioxane (POSS-OA/SH) and acrylated caster oil (ACO), which can be photo-cured through “thiol-ene” reaction. The fast photo-crosslinking reaction between POSS and ACO was traced by FT-IR, which is insensitive to oxygen gas. Compared with the pure ACO, the hybrid component of POSS-OA/SH and ACO exhibited much faster photo-cured speed upon the exposure of UV-light. The obtained hybrid materials were transparent to visible light and no obvious phase-separation was observed. AFM and SEM demonstrated that POSS nanoparticles were well-dispersed in the ACO matrix without obvious aggregation even if the content of POSS is higher than 60%. The introduction of POSS can decrease the surface energy of the obtained hybrid materials. The thermal stability of the obtained hybrid materials increased with the increase of POSS content. These characteristics gave the obtained hybrid material potential application in coating, and these studies provided a novel alternative approach to prepare the hybrid materials from the renewable source.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2016
·
IF 3.586
Siyu Chen,Longhai Guo,Dianxin Du,Jianling Rui,Teng Qiu,Jun Ye,Xiaoyu Li
A feasible co-endcapping strategy has been developed for the synthesis of monofunctional polyhedral oligomeric silsesquioxanes (POSS) modified waterborne polyurethane (WPU). The work starts from the synthesis of di-isocyanate terminated PU prepolymer from isophorone di-isocyanate (IPDI), poly (1,4-butylene adipate) end-capped diol (PBAD), and 2,2- bis (hydroxymethyl) butyric acid (DMBA). The two kinds of modifiers of monofunctional aminopropyl isobutyl POSS (AIPOSS) and with (3-aminopropyl) triethoxysilane (APTES) were used together to block the PU chains. The hybrid dispersions of curable silane-co-modified WPU with 2–8 wt% of AIRPOSS could form continuous and homogenous films under ambient conditions. The morphology and structure of the dispersed particles and the films were characterized, as well as the mechanical property and surface performance. The results indicate that the incorporation of POSS moieties into the silane-modified PU can significantly improve the mechanical property of the films and the formation of additional physical crosslinking points upon the chemical crosslinking networks. Moreover, both the surface hydrophobicity and the dielectric performance have been promoted by the incorporation of POSS. Furthermore, fluorinated groups were introduced on the films by the treatment of the fluorosilane coupling agent. The fluoro-POSS-PU hybrid films exhibit notable surface hydrophobicity as well as low dielectric constant and loss.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jianwei Bai,Yunan Zhang,Wenpan Zhang,Xiaofei Ma,Yawei Zhu,Xiuhua Zhao,Yujie Fu
A type of novel porous molecularly imprinted polymer (MIP) microspheres containing methacryl polyhedral oligomeric silsesquioxane (M−POSS) were synthesized through reversible addition-fragmentation chain transfer polymerization precipitation polymerization (RAFTPP). The obtained porous microspheres had narrow particle size distribution and regular spherical shape. The addition of M−POSS could not only largely enhance the structural stability but also increase the pore structure of MIPs. The composition and shape characteristic of the MIPs were characterized by FT-IR, CA, SEM, TGA, and N 2 adsorption–desorption isotherm. The binding properties and selectivity of the MIP and non-imprinted polymer (NIP) were demonstrated by adsorption capacity obtained based on HPLC absorption measurements. The results showed that the adsorption capacity of the paclitaxel imprinted polymer containing 85 mg M−POSS (PTX-MIP2) for PTX reached 17.24 mg g −1 after 200 min. A comparative study demonstrated that PTX-MIP2 possessed excellent selectivity towards PTX, which presented an imprinting factor of 3.17. Meanwhile, PTX-MIP2 could be reused five cycles with slight loss in adsorption capacity.
研究领域:
材料科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 70
·65756-65762
·
IF 3.289
Xiaoyan Song,Tao Li,Bowen Cheng,Jinfeng Xing
Open cage polyhedral oligomeric silsesquioxane (POSS) was firstly used to modify polyurethane (PU) to prepare a POSS–PU composite. Then a POSS–PU nanofiber membrane was prepared by electrospinning technology. The hydrophilic/hydrophobic properties, fiber morphology and biocompatibility of the POSS–PU nanofibers membrane were investigated. Contact angle increased by 24.3° for 2 wt% POSS–PU nanofibers membrane compared to PU. The ability of the nanofibers membrane surface to repel proteins and platelets was assessed by using platelet adhesion test and BSA static protein-adsorption experiment. Platelet adsorption amount obviously decreased compared with PU and very few platelet was adhered on the surfaces of nanofibers membranes when 1 wt% POSS was added. Protein adsorption was also decreased with addition of POSS. Hemolysis tests showed that hemolysis rate localized in the desired range of values (<5%) for all nanofibers membrane. Moreover, the antibacterial activity of nanofibers membranes was obviously improved after addition of POSS.
研究领域:
生物材料学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·629-638
·
IF 5.693
Song Haixiang,Zhang Qiqi,Zhang Yanwei,Wang Yanfei,Zhou Zhongyuan,Zhang Ping,Yuan Bingnan
To study the influences of 3-amino-polyhedral oligomeric silsesquioxane (NH 2 -POSS) on the properties of waterborne polyurethanes (WPU), a series of NH 2 -POSS modified WPUs were synthesized by using polypropylene glycol (PPG-2000, PPG-310), 2,2-dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI), and NH 2 -POSS via a one-pot reaction and a high shear emulsification method. The results showed that when the NH 2 -POSS amount in the WPU/NH 2 -POSS nanoemulsion was 5.73 wt% (WPU2, based on the weight of WPU resin), its viscosity was 2.496 MPa · s and its Zeta potential was 63.7 mV(pH = 6.1), showing lower viscosity and better dispersion stability. The particle size of WPU2 is smaller than that of WPU0, and the polydispersion index (PDI) of WPU2 was decreased from 5.520 to 3.837 indicating a higher crosslinking density. In addition, the thermal stability of WPU/NH 2 -POSS nanoemulsion was increased with the content of NH2-POSS from 0.00 to 13.19%. The water contact angle values for the WPU2 (84.5°) were higher than that of WPU0 (80.2°), showing an improvement of the hydrophobic properties. This WPU/NH2-POSS nanocomposites can be used for making coating adhesive for textile and hosting matrix for making multifunctional nanocomposites. Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）