JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56104
·
IF 2.7
Song Yang,Xiaoyu Chen,Peng Xu,Jianjun Shi,Qi Yao,Junning Li,Ziping Zhou,Guangxin Chen,Qifang Li,Zheng Zhou
Six varieties of alkoxy polyhedral oligomeric silsesquioxanes (POSSs) featuring methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, and n-hexoxy as terminal groups were synthesized using the direct dehydrogenation condensation method. These POSSs were then incorporated as cross-linking agents into hydroxy-terminated polydimethylsiloxane (HPDMS) to create various formulations of room temperature vulcanized silicone rubbers (RTV SRs), denoted as SRM, SRE, SRP, SRI, SRB, and SRH. The morphology, thermal stability, and mechanical properties of the resulting SRs are analyzed using scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and universal tensile testing machine. The findings indicate that the incorporation of POSS into SRs results in significant enhancements in thermal stability and mechanical properties when compared to the control group (TEOS/SR). SRB and SRH exhibit the highest cross-linking density and tensile strength. Specifically, SRB-4 demonstrates the highest tensile strength at 2.66 MPa, representing an 8.6-fold increase compared to TEOS/SR. The maximum decomposition rate temperature of SRP-4 reaches 527°C and is 194°C higher than TEOS/SR. Because the alkoxy groups with different chain lengths on POSS have different chemical reactivity, they have a great effect on the dispersion of POSS in SRs, which affect the cross-linking density, tensile strength, and thermal stability.
研究领域:
材料科学
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高分子化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2019
·
IF 5.997
Bingjie Zhao,Kun Wei,Lei Wang,Sixun Zheng
3,13-Di(cyclic carbonate) double decker silsesquioxane, a new difunctional polyhedral oligomeric silsesquioxane (POSS), was successfully synthesized. By using this POSS macromer, the organic–inorganic poly(hydroxyl urethanes) (PHUs) were synthesized with POSS cages in the main chains. Compared to the neat PHU, the organic–inorganic PHUs displayed improved thermomechanical properties. The organic–inorganic PHUs were microphase-separated, and the main-chain POSS cages were self-assembled into the nanodomains in the size of 10–30 nm. It was found that the POSS nanodomains acted as the nano-cross-linking points of physically cross-linked networks. Although the linear organic–inorganic PHUs were soluble in common organic solvents, they were capable of displaying the thermomechanical properties similar to cross-linked PHU elastomers. Owing to the physical cross-linking, the organic–inorganic PHUs were endowed with shape memory properties. In the meantime, the organic–inorganic PHUs can be reprocessed at elevated temperature; the tensile mechanical strength can be recovered up to 90%. The reprocessing properties resulted from the transcarbamoylation reaction of hydroxyurethane structural units other than the disintegration of POSS nanodomains at elevated temperature. The reprocessing properties can be utilized to program the original shapes of shape memory polymers.
研究领域:
材料科学
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高分子化学
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纳米技术
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有机-无机杂化材料
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智能聚合物
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力学性能
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Xin Wang,Ruifeng Peng,Haibo He,Xiaoxia Yan,Shouzhe Zhu,Hongbin Zhao,Dongmei Deng,Yu Qiongwei,Yunyi Lei,Liqiang Luo
This paper presents a facile strategy for designing magnetic adsorbents with versatile functions from nanomagnetic polyhedral oligomeric silsesquioxanes composite (Fe 3 O 4 @POSS), which can effectively adsorb and remove different environmental pollutants in aqueous solution. The obtained Fe 3 O 4 @POSS-SH possesses mesoporous architecture with a large specific surface area of 649.41 m 2 /g. Then a sulfonate-functionalized magnetic adsorbent (Fe 3 O 4 @POSS-SO 3 H) is derived through simple oxidization of the thiol moieties of Fe 3 O 4 @POSS-SH by H 2 O 2 . Fe 3 O 4 @POSS-SH or Fe 3 O 4 @POSS-SO 3 H can respectively serve as an effective detergent for the elimination of Cr(VI) with high adsorption capacity of 185.19 mg/g, or cationic dye pollutants (such as neutral red, methylene blue and acriflavine with high adsorption capacity of 185.19, 175.44 and 128.21 mg/g, respectively). Notably, both sulfur-loaded Fe 3 O 4 @POSS can be collected easily from water under a moderate magnetic field, facilitating the process of pollutants removal in water treatment.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Xinming Ye,Yu Feng,Panpan Tian,Zhimao Li,Yingchun Li,Wensheng Wang,Jie Li,Liang Qiao,Kun Wang,Wenchao Zhang,Ye-Tang Pan,Rongjie Yang
Despite remarkable advances in developing flame retardants and smoke suppressants for epoxy resin (EP), engineering nitrogen-containing polyhedral oligomeric silsesquioxane (N-POSS) to impart superior fire safety properties to EP has remained an intractable challenge. In this work, two nitrogen-containing polyhedral oligomeric silsesquioxanes (N-POSSs), namely, aminoethyl-aminopropyl-hepta-phenyl polyhedral oligomeric silsesquioxane (AEAP-POSS) and aminopropyl-hepta-phenyl polyhedral oligomeric silsesquioxane (AP-POSS), were synthesized through the “corner-capping” reaction. The molecular structures of N-POSSs were fully characterized by FTIR, 1 H NMR, 29 Si NMR and MALDI-TOF MS, and the synthesized AEAP-POSS and AP-POSS were introduced into EP to solve the shortcomings of flammability. TGA results showed that the incorporation of 4 wt% N-POSS nanoparticles distinctly improved the char residue at 800 °C, which significantly enhanced the thermal stability of the EP composites. When 4 wt% of AP-POSS was introduced into EP, reductions in the peak of heat release rate (p-HRR), fire growth index (FGI), peak of smoke production rate (p-SPR), and the peak of CO production rate (p-COP) reached to 60.6%, 70.2%, 52.3% and 60.4%, respectively. Subsequently, TG-FTIR and XPS were utilized to investigate the flame retardancy and smoke suppression mechanism. Our work presented a considerable advancement for the facile fabrication of flame retardants based on nitrogen-containing polyhedral oligomeric silsesquioxane compounds.
研究领域:
材料科学
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化学工程
·
高分子科学
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消防安全工程
✓ 已验证
DOI
高影响因子
Nanophotonics
·
2018
·Vol. 7
·期 7
·1341-1350
·
IF 6.014
Jiangying Xia,Kang Xie,Jiajun Ma,Xianxian Chen,Yaxin Li,Jianxiang Wen,Jingjing Chen,Junxi Zhang,Sizhu Wu,Xusheng Cheng,Zhijia Hu
This paper systematically demonstrated a variety of experimental phenomena of random lasers (RLs) of N,N′-di-(3-(isobutyl polyhedral oligomeric silsesquioxanes)propyl) perylene diimide (DPP) organic/inorganic hybrid laser dye, which is composed of perylene diimide (PDI) as gain media and polyhedral oligomeric silsesquioxanes (POSS) as scattering media at a mole ratio of 1:2. In this work, we observe the transition from incoherent RL in the DPP-doped solutions and polymer membrane systems using dip-coating method to coherent RL in the polymer membrane system with defect waveguide using semi-polymerization (SP) coating method. Meanwhile, we found that the hybrid dye-DPP has a long lasing lifetime compared with the traditional laser dyes, which indicates that the POSS group can suppress the photo-bleaching effect to extend the working life of laser dyes.
研究领域:
光学
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材料科学
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光子学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yiqiong Chen,Xinyue Ding,Dandan Zhu,Xucong Lin,Zenghong Xie
Nonspecific adsorption is a challenge of specific recognition on aptamer-based affinity monoliths. Here, a novel highly hydrophilic polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-based hybrid-silica affinity monolith with a good recognition nature was prepared and used for specific discrimination of ochratoxin A (OTA). A homogeneous polymerization mixture consisted of POSS chemicals, hydrophilic monomers and aptamer solution was directly polymerized via the “one-pot” method. Preparation and characterization of the resultant affinity monolith were studied in detail. A highly hydrophilic nature was obtained and the typical hydrophilic interaction liquid chromatography (HILIC) was observed when acetonitrile (ACN) content in mobile phase was 25%, which reached the highest hydrophilicity of POSS-based hybrid monoliths. By using OTA as model analyte, the nonspecific adsorption was effectively suppressed. The recovery of the analogue ochratoxin B (OTB) was only about 0.1% even if the content of OTB was 50 times more than OTA, which was much better than other POSS-containing monoliths and polar siloxane-based hybrid monoliths. Applied to beer samples, the adsorption of background materials was drastically resisted, and efficient recognition of OTA was obtained with the recoveries of 94.9–99.8%. Much less disturbance was observed than that occurred in hydrophobic POSS-based affinity monolith. It lights an attractive implement with high hydrophilicity and specificity for online selective recognition of OTA.
研究领域:
分析化学
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食品科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Xingyao Liu,Mingzhuan Li,Peifeng Feng,Xinyu Fan,Zhongwei Yan,Hang Jia,Xigao Jian,Yujie Song,Jian Xu
Carbon fiber-reinforced thermoplastic composites are promising materials with many application prospects. However, surface inertness of CFs weakens the interfacial properties of these composites. Therefore, in this study, an anchor-inspired structure was designed and grafted onto CFs by using an anchor-inspired segmented copolymer , comprising of polyimide as the “chain” and polyhedral oligomeric silsesquioxane (POSS) as the “anchor”. In combination with atom transfer radical polymerization with the advantage of controllable molecular weight , degree of polymerization of the anchor-shaped structure with the best compatibility with poly (phthalazinone ether nitrile ketone) (PPENK) resin was pre-determined through molecular dynamics simulations, which reduced the experimental costs. The results of X-ray photoelectron spectroscopy indicated the successful connection of the numerous anchor-shaped structures to the CFs. Compared to composite made of origin fibers and PPENK, the interfacial shear strength at the microscopic level and interlaminar shear strength at the macroscopic level of grafted CF and PPENK composite increased by 184.9 % and 44.2 %, respectively. This is mainly attributed to the synergistic effect of mechanical interlocking and interfacial interaction between the anchor-shaped structure and the PPENK resin. This study serves as a feasible path to enhance the interfacial adhesion of composites by designing an anchor-shaped structure of organic macromolecules and inorganic nanoparticles on CFs.
研究领域:
材料科学
·
高分子科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 45
·31500-31507
·
IF 10.7
Yuying Wang,Fanjun Guo,Mengzhen Zhou,Qian Wu,Tao You,Zhengxiang Zhong,Jiankun Yang,Li Liu,Yudong Huang,Mingqiang Wang
Lithium metal batteries (LMBs) have been regarded as promising electrochemical energy storage systems due to the high theoretical specific capacity of metallic lithium. However, the uncontrolled growth of lithium dendrites, stemming from uneven lithium deposition, poses a significant challenge to their practical implementation. To tackle this issue, an ultra-thin composite separator, consisting of octamethacryloyloxy sesquioxane (MA–POSS), methacryloyloxy trimethoxysilane grafted holey graphene oxide (MPS–HGO), and aramid nanofibers (ANF), was prepared through a combination of phase transition-induced co-assembly and in situ polymerization techniques. Experiments indicate that the composite separator, with a thickness of only 3.8 μm, exhibits exceptional mechanical properties, specifically a tensile strength of 104 ± 5.1 MPa and a modulus of 3.23 ± 0.2 GPa, due to extensive hydrogen bonding and π–π interactions between the HGO sheets and ANF. Furthermore, benefiting from the synergistic effect of the abundant pores in MPS–HGO and the inhibition of stacking through the copolymerization of MPS–HGO and MA–POSS, the composite separator also demonstrates good electrolyte infiltration and a high lithium-ion transport number (tLi+ = 0.87), which not only acts as a physical obstacle but also efficiently regulates Li-ion transport to hinder irregular dendritic growth. The simultaneous regulation of Li-ion transport and mitigation of dendrite growth resulted in a long cycle life for Li|Li cells without dendrite deposition after 1500 cycles at a high current density of 5 mA cm−2. Moreover, the LiFePO4 (LFP)|Li battery with the composite separator displayed a capacity of 154 mA h g−1, a coulombic efficiency of 99%, and a high capacity retention of 99.6% after 250 cycles at 0.5C (85.7% after 1000 cycles at 2C). This work provides a promising new approach to fabricating high-performance lithium battery separators.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）