GIANT
·
2020
·
IF 0
Hongkun Yang,Changfei He,Thomas P. Russell,Dong Wang
Although considerable progress has been made in developing vitrimers, on-going challenges for vitrimers for high-performance applications include the improvement in mechanical properties and identification of more efficient exchange reactions. By incorporation of glycidyl polyhedral oligomeric silsesquioxane (POSS) as a nanoscale filler in epoxy, we produced epoxy-POSS nanocomposite vitrimers that show high strength, toughness, thermal stability, and efficient relaxation. With 10 wt% POSS, the ultimate tensile strength and strain at break of the epoxy-POSS nanocomposite vitrimers increased by ~64% and ~76%, respectively, while at 160 °C the stress relaxation time increased by ~260% in comparison to that of pure epoxy vitrimer. The epoxy-POSS nanocomposite vitrimers show high malleability due to the efficient transesterification reaction and re-processability with little degradation of their initial mechanical properties, suggesting opportunities for sustainable plastics.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
CORROSION SCIENCE
·
2020
·
IF 6.479
Tong Liu,Haichao Zhao,Jingyu Li,Dawei Zhang,Wenru Zheng,Liping Wang
A giant molecule containing hydrophobic polyhedral oligomeric silsesquioxane (POSS) and protonic acid-doped tetraaniline (ATA) was designed and synthesized via isocyanate–amine reactions. This flower-like filler exhibits redox activity and high specific capacitance (280 F g −1 ), making it feasible for corrosion protective applications. Electrochemical impedance spectroscopy, local electrochemical impedance spectroscopy, and salt spray tests were performed to evaluate the effect of POSS–ATA on the corrosion inhibition performance of the coating. This giant molecule expands the scope of conducting polymers for the active corrosion inhibition of metallic substrates and provides a platform for studying the multi-responsive self-assembly behaviour of conducting polymers.
研究领域:
材料科学
·
电化学
·
防腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Chengyu Shi,Jianli Wang,Ying Zhou,Xinyuan Lu,Gang Chang,Aizhao Pan,Ling He
Cultural relics reflect the vitality and creativity of human beings but are being irreversibly damaged with the current protective materials exhibiting high brittleness , easy crack and unsatisfactory protection. We fabricated a POSS-based polymer POSS- g -(PGMA- co -PFMA) 2 with high transparency, high hydrophobicity and adhesive nature by SI-ATRP. In addition to reducing the phase separation during film formation, the POSS-based polymer also improved the transparency (up to 99 %). The protected sandstone presented almost no changes (ΔΕ ⁎ = 1.34) on the chroma compared to the pristine sandstone. The polymer showed good surface hydrophobicity (glass: 100–105°; sandstone: 131°) and adhesive properties (0.44–2.59 MPa) which varied based on solvents. With increasing GMA content, there was gradual increase in the adhesive strength (0.59–2.68 MPa). Meanwhile, the POSS- g -(PGMA- co -PFMA) 2 film presented excellent freeze-thaw resistance and salt tolerance. As a kind of hydrophobic and bonding coating material suitable for harsh environments with high hydrophobic, high transparency, high thermal stability , and durability, it provides a new solution to solve the severe problem of cultural relics protection with a wide application prospect.
研究领域:
材料科学
·
文化遗产保护
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·94876-94883
·
IF 3.289
Lei Liu,Zhengquan Liu,Peng Huang
Polyhedral oligomeric silsesquioxane (POSS) based nanohybrids were prepared via “thiol–ene click” reaction between vinylPOSS and alkyl mercaptan. The structure and composition of these hybrids were characterized by 1H nuclear magnetic resonance (1H NMR), thermo-gravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR). The effects of carbon chains of mercaptan and concentration variations of POSS nanohybrids on the tribological performance improvements of liquid paraffin (LP) were investigated. According to our experimental results, the optimal concentration of POSS nanohybrids in LP was 0.40 wt%, corresponding to the lowest friction coefficients of 0.099 (for OS-POSS additive) and 0.101 (for OD-POSS additive) respectively. POSS nanohybrids can achieve homogeneous dispersion in LP, while a hard, stable Si–O cage in their molecular structure provided effective wear resistance. These nanohybrids were expected to be useful for more lubricating oil systems, which possess great scientific values and promising application prospects compared with pure solid or liquid lubricating additives.
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
POLYMER
·
2019
·
IF 3.771
Zixuan Lei,Jingru Ji,Qianqiu Wu,Junjie Zhang,Yixun Wang,Xinli Jing,Yuhong Liu
Easily oxidized group and rigid structure of phenolic resin (PR) network can result in brittleness and low char yield at high temperatures, which limits the widespread applications of PR in harsh environment. Whilst organic-inorganic hybrid material , such as POSS-containing material was introduced to enhance PR, the microstructure and the thermo-mechanical properties of the hybrid material modified PR are not well understood. Therefore, in the work, a novel organic-inorganic hybrid networks (ENH) were prepared with epoxy-polyhedral oligomeric silsesquioxane (EPOSS) modified novolac phenolic resin (EN) and hexamethylenetetramine (HMTA) to further clarify the curing behavior and its relation to microstructure and the resulting thermal-mechanical properties. Here, the curing characteristics of ENH were discussed by usinag advanced isoconversional method and Fourier transform infrared spectroscopy (FTIR). It was revealed that a diversity of crosslinking networks was exhibited after curing ENH, including EPOSS-NR crosslinked, tethered structure, and self-polymerized structure of EPOSS as well as NH networks. When the substitution degree of EPOSS is relatively low, EPOSS serves as a junction point to further improve the crosslinking density of ENH networks, leading to better thermo-mechanical properties, thermal stability and tensile property as well as lower dielectric properties . However, as the self-polymerization of EPOSS increased, the NH network was dramatically disrupted and the thermo-mechanical properties, thermal stability and tensile property of ENH were deteriorated.
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
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 1
·59-65
·
IF 1.754
Yang Zhenglong,Fu Kangyu,Yu Jing,Liu Xinyan
The organic/inorganic hybrid material of poly[2-(dimethyl amino)-ethyl methacrylate]/polyhedral oligomeric silsesquioxane (POSS–PDMAEMA) was synthesized via a thiol-Michael addition reaction. The structures of POSS–PDMAEMA and its self-assembly in aqueous solution were confirmed by 1 H-NMR, TEM, DLS, UV–Vis and fluorescence spectrum. In aqueous solutions, POSS–PDMAEMA could self-assemble into micelles and its critical micelle concentration was 12.4 mg/L. POSS–PDMAEMA micelles can adsorb dyes efficiently, it could adsorb methyl red at a concentration of 10–100 mg/L and dithizone at a concentration of 20–100 mg/L, and could remove 98% methyl red and 90% dithizone within 30 s. Due to the good temperature and pH responsiveness, POSS–PDMAEMA micelles could release organic dye absorbed into the organic solution again when the solution was heated to 40 °C or pH value of the solution was adjusted to 4.0. It suggested that POSS–PDMAEMA can be utilized as an interesting “smart” materials for absorption of organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Ting Xi Li,Hai Bo Su,Li Gao,Lin Jiang,Cheng Xiang Zhang,Yong Qin Han,Yanmin Wang,Qing Wang
Improving the mechanical properties and ultraviolet resistant properties of epoxy resin (EP) is attracting the scientists’ increasing interest in engineering industries at present. For this reason, novel Vi-POSS-TiO2/EPnanocomposites were prepared by incorporating nanotitanium dioxide (TiO2) and PSS-Octavinyl substituted (Vi-POSS) organic-inorganic hybridparticles into the epoxy resin. Filling up with TiO2 and Vi-POSS may create an inherent ultraviolet (UV) absorption property and mechanical property, respectively. The obtained composites were characterized by some standard analytical techniques such as UV-vis spectroscopy, Scanning electron microscope (SEM), and Thermal gravity analysis (TGA). When the content of TiO2was 1.5wt%, UV-vis absorption spectra showed that the excellent absorption properties of EP composites can be achieved. When the content of Vi-POSS was 6wt%, the values of bend strength and impact strength were improved 14.75%and37.94%, respectively. The TGA result showed that the thermal stability of EP composites varied in a small range before and after adding 6wt% Vi-POSS.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Yuewei Li,Jie Zhong,Lixin Wu,Zixiang Weng,Longhui Zheng,Shuqiang Peng,Xu Zhang
High performance stereolithography resin (SLR) nanocomposites with different amount of modified polyhedral oligomeric silsesquioxane (m-POSS) nanoparticles, which were synthesized through NH 2 -POSS and 2-isocyanatoethyl methacrylate, have been prepared. By copolymerization POSS nanoparticles can be grafted onto the polymer chains of the SLR matrix. The modified structure of POSS nanoparticles was characterized by Fourier transform infrared spectroscopy and 1 H NMR. The effects of m-POSS nanoparticles on morphologies, mechanical and thermal properties of SLR nanocomposites were investigated in detail. The results show that the tensile and flexible strength were improved by 36.2% and 40% respectively with the addition of 5% w/w m-POSS nanoparticles compared to pristine SLR. The nanoindentation analysis shows a significant amelioration in hardness and reduced modulus by the introduction of m-POSS nanoparticles. The results from thermal studies reveal that the incorporation of m-POSS nanoparticles can significantly enhance the glass transition temperature ( T g ), degradation temperature, char yield, and heat distortion temperature of nanocomposites. Moreover, the incorporation of m-POSS nanoparticles would not only improve the mechanical and thermal properties, but also maintain the high fabrication accuracy of the SLR for 3D stereolithography printing.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Liping Jin,Chenpeng Ji,Shun Chen,Kun Qian,Lingxin He,Wei Wang,Wenwen Guo
Two-dimensional (2D) nanosheet materials (MXenes) have unparalleled advantages in the field of flame-retardant multifunctional composites, but their dispersibility, flame retardancy and compatibility with the matrix are poor and need to be enhanced. In this research, we employed interfacial decoration and grafting modification to firstly introduce proanthocyanidins (PCs) onto MXenes surface (forming PC-MXenes) to increase the number of available active sites. On this basis, phosphorylated A-POSS was grafted onto PC-MXene (resulting in PAP@P-MXene) via a one-pot method, organic–inorganic hybrid flame-retardant PAP@P-MXene nano-coatings were subsequently constructed on the surface of cotton fabrics via an immersion method, and their structure-property relationships were verified. Thermogravimetric analysis (TGA) results revealed that PAP@P-MXene displayed a high char residue content of 32.0 % at 800 °C, illustrating its pretty good fire-safety properties. Typically, the residual char amount of coated cotton fabric with 12 wt% PAP@P-MXene (C-PAP@P-MXene-3) under a N 2 atmosphere was as high as 37.1 %. Additionally, the limiting oxygen index (LOI) increased to 31 %, while the peak heat release decreased by 79.83 %. C-PAP@P-MXene-3 also displayed a UL-94 V-0 rating and self-extinguishing ability, all of which demonstrated excellent fire safety performance. The unique 2D nanosheet structure of MXenes, along with their innovative structural design and synergistic flame-retardant strategy, endows the nanomaterials with good dispersibility and flame-retardant effects, which has led to the development of new flame-retardant strategies and expanded the potential applications of MXene materials.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 37
·e55936
·
IF 2.7
Guang-Zhao Li,Hao Yu,Hongwei Zhang,Rui Han,Pan He,Jiaxuan Cao,Qian Lu,Gen Liu,Gang Chen,Wenyan Wang,Weicai Wan,Yujun Wei,Shuai Zhang
This work investigated the composites (PA6/BF) made of basalt fiber (BF) and nylon 6. To improve the interfacial bonding between the fibers and the polymer matrix, and to enhance the thermal and mechanical properties of the composites, polyhedral oligosilsesquioxanes (POSS) with epoxide groups was introduced to modify the surface of BFs using the slurry coating method. It is revealed that the mechanical properties of the composites increased and then decreased with increasing POSS coating. The composite PA6/BF-POSS3 with BFs modified with a POSS solution of 3.0 wt% showed the best properties. The tensile strength of PA6/BF-POSS3 was 130.8 MPa, 26.4% higher than that of the PA6/BF and 126.3% higher than that of neat PA6. In addition, PA6/BF-POSS3 exhibited a 5% weight loss temperature of 417.7, 35.6°C higher than that of PA6/BF. The chemical bonding formed between the amide and epoxide groups, and the hydrogen bonding formed between the amide groups and hydroxyl groups were believed to be the main reasons for the improved interfacial interaction and improved properties.
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
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Mingli Ni,Guannan Chen,Yong Wang,Haiyan Peng,Yonggui Liao,Xiaolin Xie
Holographic polymer nanocomposites containing the liquid crystal (LC) have garnered a great deal of attention primarily because of their unique electric-switchable optical properties . Herein, three types of polyhedral oligomeric silsesquioxane (POSS) are doped into the holographic polymer nanocomposites to tune their ordered structure and electro-optical performance. These POSS dopants are methacryl POSS with eight reactive double bonds, methacrylisobutyl POSS with one reactive double bond, and aminopropylisobutyl POSS with nonreactive groups. Interestingly, methacryl POSS is primarily chemically bonded to the polymer network within the constructive regions, which deteriorates the diffraction efficiency and electro-optical performance due to the depressed ordered structures. In contrast, methacrylisobutyl POSS displays a negligible effect on the diffraction efficiency and electro-optical performance while significantly improving the thermostability of holographic polymer nanocomposites, although it is also chemically linked to the polymer network within the constructive regions. Distinctively, aminopropylisobutyl POSS mainly locates in the destructive regions and clearly improves the electro-optical performance and thermostability of holographic polymer nanocomposites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Gang Xiong,Peng Kang,Jiancheng Zhang,Bowen Li,Jianyu Yang,Guangxin Chen,Zheng Zhou,Qifang Li
A series of coatings composed of hydroxyl-terminated methyl phenyl silicone rubber (PSi) and silanized epoxy resins (SERs) were prepared in a facile way. Four kinds of SERs with different structures and degree of functionality were synthesized successfully and used to modify the silicone coating. The obtained room temperature vulcanized (RTV) silicone coatings showed excellent adhesion, great heat resistance and anticorrosion properties. Compared with pure PSi, the coatings containing 25 wt% SERs showed better thermal properties, manifested as delayed degradation temperature and greatly increased char yield at 800℃. The adhesion of coatings all reached the highest level (degree 0) which exceeded that of pure PSi coating (degree 2). Furthermore, the anticorrosion property of the coatings in 5 wt% acid, alkaline, and saline environments was all improved. The incorporation of SERs improved the compatibility between the silicone rubber and epoxy resins, in which the epoxy group created more adhesion of cured blended coating and POSS led a significant enhancement in thermal and anticorrosive properties. Their combined effect endowed silicone coatings with more application prospects.
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
危险品化学品经营许可证（带存储）