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
POLYMER
·
2022
·
IF 4.432
Zhifu Guan,Yiqi Jin,Sha Shi,Biyao Jin,Meishan Zhang,Lianhua Zhao
To enhance the conductivity of sulfonated polyether ether ketone (SPEEK, SP) membrane and avoid the loss of ionic liquid (IL), using aminopropyloligosisiloxane (NH 2 -POSS) as molecular hybrid filler, a self-assembled medium temperature and non-humidified SP/IL/NH 2 -POSS hybrid membrane was prepared. NH 2 -POSS can be assembled into the hydrophilic domain ion phase of SPEEK. In which, –NH 2 of NH 2 -POSS and –SO 3 H of SPEEK formed acid-base pairs at the interface which were conducive to the construction of proton transport channel. In addition, NH 2 -POSS enriched IL in the hydrophilic domain, which retained IL while synergistically increased the conductivity. The results showed that the IL loss rate of SP/IL/NH 2 -POSS-2 membrane was 46.9 wt%, which was about 55.8% of SP/IL membrane; the conductivity of SP/IL/NH 2 -POSS-2 membrane at 200 °C without humidification was 5.51 mS·cm −1 , which was about 4 times that of SP/IL membrane.
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
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Liang Shao,Ying Li,Zhonglei Ma,Yang Bai,Jie Wang,Peiyun Zeng,Pin Gong,Fuxiong Shi,Zhanyou Ji,Yang Qiao,Ran Xu,Juanjuan Xu,Guohong Zhang,Caiyun Wang,Jianzhong Ma
Conductive hydrogel-based wearable strain sensors with tough, stretchable, self-recoverable, and highly sensitive properties are highly demanded for applications in electronic skin and human–machine interface. However, currently, hydrogel-based strain sensors put forward higher requirements on their biocompatibility, mechanical strength, and sensitivity. Herein, we report a poly(vinyl alcohol)/phytic acid/amino-polyhedral oligomeric silsesquioxane (PVA/PA/NH2-POSS) conductive composite hydrogel prepared via a facile freeze–thaw cycle method. Within this hydrogel, PA acts as a cross-linking agent and ionizes hydrogen ions to endow the material with ionic conductivity, while NH2-POSS acts as a second cross-linking agent by increasing the cross-linking density of the three-dimensional network structure. The effect of the content of NH2-POSS is investigated, and the composite hydrogel with 2 wt % NH2-POSS displays a uniform and dense three-dimensional (3D) network microporous structure, high conductivity of 2.41 S/m, and tensile strength and elongation at break of 361 kPa and 363%, respectively. This hydrogel is biocompatible and has demonstrated the application as a strain sensor monitoring different human movements. The assembled sensor is stretchable, self-recoverable, and highly sensitive with fast response time (220 ms) and excellent sensitivity (GF = 3.44).
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
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Yongke Tan,Junhui Liu,Yujing Li,Qi Wang,Weibo Zhou,Yuhui Ao,Ming Li
The high strength and toughness of Carbon Fiber-Reinforced Polymers (CFRPs) are the main requirements for their properties in various fields. Herein, the “soft-rigid-soft” structure has been designed by us to achieve the aim of the improvement for the CFRP strength and toughness simultaneously. The soft-rigid-soft structural interface layer of CF was firstly constructed by carbon nanotubes (CNT) and Tannin/Aminopropyl isobutyl POSS (TA/NH 2 -POSS). The interfacial shear strength (IFSS) of the modified carbon fiber composite was 111.94 MPa, which was 84.08 % higher than that of the untreated fiber (60.81 MPa). Moreover the interlaminar shear strength(ILSS) and impact strength were increased by 50.43 % and 80.37 %. Enhancement of interface performance is mainly ascribed to CNT and TA/NH 2 -POSS, because they can effectively which is more effective to consume energy and decentralize stress. In this paper, the strength and toughness of CFRPs ware effectively improved by the in-depth and detailed design of the “soft-rigid-soft” multi-scale structure.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Junhui Zhao,Xinda You,Guangzhe Wang,Jinqiu Yuan,Yafei Li,Chao Yang,Shiyu Zhang,Xiaoyao Wang,Runnan Zhang,Hong Wu,Zhongyi Jiang
Nanofiltration membranes that can selectively remove multivalent ions from salty water hold great promise in water treatment and salt utilization. However, developing nanofiltration membranes with high rejection to both divalent anions and cations remains a grand challenge. Herein, we design a kind of mix-charged polyamide membranes (MCPMs) via molecular hybridization to achieve the removal of versatile divalent ions. Amino-functionalized polyhedral oligomeric silsesquioxane (NH 2 -POSS) was employed as molecular filler added into piperazine and reacted with trimesoyl chloride at the aqueous-organic interface to generate cross-linked polyamide-NH 2 -POSS mixed network. The protonated amino groups from NH 2 -POSS offered positively charged sites for enhanced divalent cation repulsion while the deprotonated carboxyl groups from polyamide network can afford negatively charged sites for divalent anion repulsion. The optimized membrane displayed high rejections to both divalent anionic and cationic ions (Na 2 SO 4 rejection of 98.2%, MgCl 2 rejection of 98.0%), together with high mono-/divalent salt selectivity (NaCl/Na 2 SO 4 of 48.2, LiCl/MgCl 2 of 43.9) that outperformed the benchmark nanofiltration membranes. This molecularly-hybridized charge modulation method may enlighten the structural design of membranes for efficient ionic separations.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 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）