RSC Advances
·
2018
·Vol. 8
·期 47
·26563-26570
·
IF 2.936
Zhicai He,Zhengping Zhao,Shengwei Xiao,Jintao Yang,Mingqiang Zhong
Polymeric microcellular foams with high strength and light weight are very important for industrial applications. However, regulating their cell structure and their weak flame retardancy are problematic. We designed single-arm POSS-based ionic liquids ([bel-POSS][PF6]), and constructed hybrid composites based on physical interaction between ionic liquids and carbon-based materials in PS microcellular foaming. Ionization of bel-POSS could result in a quaternary ammonium reaction and ion-exchange reaction, and the carbon materials exhibit good dispersion through blending. The prepared hybrid composites showed high CO2 adsorption. Conical calorimeter tests showed that PS composite materials could reduce the heat release rate, total heat release, toxic gases (CO2 and CO) release, and amount of smoke generated. These carbon materials could affect PS micropore structure, including the cell diameter and density. Upon addition of 5 wt% of carbon materials, the hole diameter decreased by >50%, and the hole density increased nearly ten folds.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 3
·2101134
·
IF 4.122
Shuai Zhang,Xuetao Shi,Zhenyun Miao,Haibin Zhang,Xin Zhao,Kai Wang,Jianbin Qin,Guangcheng Zhang
This work proposes a facile fabrication strategy of polyurethane (TPU) tissue-engineering scaffold with hierarchical structure, designed by combination of the fused deposition modeling (FDM) 3D printing and supercritical microcellular foaming by carbon dioxide (CO 2 ). Further surface modification of TPU scaffold with graphene oxide (GO) was carried out by in situ polymerization of polydopamine (PDA) to ensure stable loading of GO with antibacterial properties. The influence of 3D-printing temperature and speed on the microcellular cell morphology of TPU scaffold was investigated and optimized. The microcellular foaming and expansion process was indicated to compensate mechanical loss because of the gaps of stacking layers by FDM printing, and the reported tensile strength of 28 MPa matched well with that of natural cartilage tissue constructs. More interesting, the formation of interconnected open pores on the surface of foamed TPU scaffold shows much more enhanced cell adhesion because of the bigger specific surface area of microcellular structure. Similarly, the foamed TPU scaffold exhibits good absorption of GO nanosheets by the synthesized PDA on the surface and antibacterial properties, compared with the unfoamed TPU scaffold. This work offers a strategy for designing and manufacturing polymer tissue-engineering scaffold with hierarchical structure and good antibacterial property.
研究领域:
生物医学工程
·
组织工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 2
·1-8
·
IF 1.92
He Zhicai,Zhong Mingqiang,Yang Jintao
Aiming to prepare polystyrene microcellular foam with improved foam morphology and high thermal stability, ionic liquids which have been well demonstrated to possess high carbon dioxide (CO 2 ) absorption capacity were introduced into polystyrene by copolymerization of styrene and polymerizable ionic liquids, i.e., vinylbenzyl trimethyl ammonium fluoroborate ([VBTMA][BF 4 ]) and vinylbenzyl trimethyl ammonium hexafluorophosphate ([VBTMA][PF 6 ]), Abbr. ILs). These copolymers showed higher glass transition temperature (T g ) and high supercritical carbon dioxide (scCO 2 ) solubility, based on which foams with smaller cell size, higher cell density, and higher thermal stability were prepared by the microcellular foaming using scCO 2 as blowing agent. The morphology of the resultant foams highly depended on the foaming temperature, ionic liquid type and content. Compared to [VBTMA][BF 4 ]-St foam, [VBTMA][PF 6 ]-St have higher CO 2 absorption and glass-transition temperature, making it exhibit superior cell morphology. This work demonstrates that the introduction of ionic liquids can benefit the morphology control and thermal stability of polymeric foams and hopefully provides a promising method for the design and preparation of polymeric foams with high performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Qiang Gao,Yu Zhang,Shuai Zhang,Yan Ma,Xianzhe Sheng,Linhao Hui,Zhiwei Wang,Shuhuan Yun,Jianbin Qin,Guangcheng Zhang
To simultaneously enhance the processability, electrical conductivity and mechanical properties of composite foam for high-performance electromagnetic interference (EMI) shielding application, in this work, the epoxy (EP)/reduced graphene oxide (rGO)/Ni-chains microcellular composite foam is prepared through strategy of combining the hierarchical structured aerogel skeleton and supercritical carbon dioxide (scCO 2 ) foaming process. Benefiting from the construction of the rGO/Ni-chains bicontinuous conductive skeleton and introduction of microcellular structure, the EP/rGO/Ni-chains microcellular foam displays a “brick-and-mortar” structure and implements the multiple dissipation mechanism of electromagnetic (EM) wave to achieve outstanding EMI shielding efficiency (EMI SE) of 41.11 dB in X-band. Moreover, the selection of liquid epoxy as matrix avoids the use of large amounts of organic solvents, ensures the well processability of composite and realizes the excellent compressive strength (27.33 MPa) of the EP/rGO/Ni-chains microcellular foam with a density of 0.88 g/cm 3 , which shows great application value as a high-performance EMI shielding material.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jiantong Li,Guangcheng Zhang,Hongming Zhang,Xun Fan,Lisheng Zhou,Zhengyang Shang,Xuetao Shi
Epoxy/functionalized multi-wall carbon nanotube (EP/F-MWCNT) microcellular foams were fabricated through a supercritical CO 2 (scCO 2 ) foaming method. MWCNTs with carboxylation treatment were disentangled by using alpha-zirconium phosphate (ZrP) assisting dispersion method and functionalized with sulfanilamide. The F-MWCNTs were redispersed in acetone for mixing with epoxy resins to prepare nanocomposites. It was found that the dispersion of MWCNTs could be improved, thus heterogeneous nucleation effect of F-MWCNTs took place effectively during the foaming process, resulting in the formation of microcellular structure with larger cell density and smaller cell size. The volume conductivity and electromagnetic interference shielding performance of foamed EP/F-MWCNT nanocomposites were studied. When the F-MWCNT addition was 5 wt%, the conductivity of the foamed EP/F-MWCNT nanocomposites was 3.02 × 10 −4 S/cm and the EMI shielding effectiveness (SE) reached 20.5 dB, significantly higher than the corresponding results of nanocomposite counterparts, indicating that introducing microcellular structure in EP/F-MWCNT nanocomposites would beneficial to improve their electrical conductivity and electromagnetic interference shielding performance.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 2
·2100702
·
IF 4.367
Yiming Wang,Zhen Yu,Ajit Dattatray Phule,Yongxian Zhao,Shibao Wen,Zhen Xiu Zhang
Herein, a developed microcellular foam from polybutadiene rubber (BR) and styrene butadiene rubber (SBR), which is prepared by prevulcanization, supercritical foaming, and secondary vulcanization processes is reported. It has excellent abrasion resistance and with low density. The foaming process is successfully achieved with the assistance of eco-friendly supercritical nitrogen (sc-N 2 ). The microstructural analysis of BR/SBR foams indicates that the cell structure of BR/SBR foams has an obvious effect with the increased prevulcanization time. The thickness of solid skin on the foam surface is observed using scanning electron microscope, which revealed that the prevulcanization time is also a direct factor influencing the thickness of solid skin, where the fundamental cause is explained from two aspects, i.e., gas escape and rubber vulcanization. The prevulcanization time to meet the abrasion resistance characteristics has determined based on the cell structure and abrasion solid skin thickness of BR/SBR foams at different time zone of prevulcanizations. As a result, BR/SBR foams prepared by this process have a low relative volume loss (62.6–117.1 mm 3 ) and a desirable density (0.50–0.71 g cm −3 ) at a prevulcanization time of 15–17 min.
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 Materials Chemistry A
·
2015
·Vol. 3
·期 25
·13507-13518
·
IF 7.443
Heping Gao,Jianming Pan,Donglai Han,Yunlei Zhang,Weidong Shi,Jun Zeng,Yinxian Peng,Yongsheng Yan
Herein we report a novel synthetic strategy for fabrication of microcellular foam catalysts (MFCs) with hydrophobic, acid–base, and hierarchical porous properties for conversion of one-pot cellulose to a key chemical platform (i.e. 5-hydroxymethylfurfural, HMF) for biofuels. The water-in-oil (W/O) Pickering high internal phase emulsions (HIPEs), stabilized by both amino-functionalized nanoparticles (namely, S-NH2) and Span 80, were used as the template for simultaneous polymerization of oil phase containing 1-octene, divinylbenzene (DVB), and trihydroxymethylpropyl trimethylacrylate (TMPTMA). After subsequent sulfonation process, acid and base sites resulting from grafted –SO3H group of polydivinylbenzene (PDVB) and S-NH2 were both located on the surface of the MFCs. The resultant MFCs composite had a typical hierarchical porous structure, and the macropores with a well-defined open-cell and interconnecting pore throat structure could be controlled via the composition of the oil phase of emulsion, with the mesopore structure closely related to the degree of cross-linking of oil-soluble functional monomer. The representative catalyst MFCs-3 had a hierarchical porous structure (macropores ranging from 1.0 µm to 30 µm and uniform mesopores in 32.1 nm), hydrophobic surface (water contact angle of 125°), 0.735 mmol g−1 of base, and 1.305 mmol g−1 of acid. The HMF yield of 41% for cellulose conversion showed its excellent catalytic performance. This work opens up a route for simple and controlled fabrication of multifunctional polymeric catalysts for biomass energy conversion.
研究领域:
材料科学
·
催化化学
·
生物质能转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Haoyu,Zhang Xiaoqi,Ma Xintao,Liu Wentao,Liu Hao,Liu Xuying,He Suqin,Huang Miaoming,Xu Wanlin,Zhu Chengshen
Bio-based polyamide elastomers, known for their excellent mechanical properties, represent a promising environmentally friendly material with significant potential. In this study, we synthesized TPA510/6(short for polyamide 510/6 elastomer, the main components of which are 1.5-Pentanediamine, sebacic acid, caprolactam and polyetheramine), a polyamide elastomer with a high bio-based content, outstanding low-temperature resistance, and superior mechanical performance. Additionally, microcellular elastic foams with pore sizes below 10 nm were fabricated by foaming with supercritical carbon dioxide. These TPA510/6 foams demonstrated remarkable tensile strength, compressive strength, low-temperature resistance, and friction resistance. Furthermore, simulations of the thermal insulation properties of the foams under real-world conditions revealed low thermal conductivity, highlighting their excellent insulation performance. As a result, the bio-based polyamide elastomer foams developed in this study show significant promise for applications in areas such as building insulation, sports protection, and thermal camouflage.
研究领域:
材料科学
·
高分子科学
·
热工工程
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Lu Liu,Gaoquan Hu,Lin Chen,Feng F. Hong
Pure bacterial cellulose dressings exhibit limited therapeutic outcomes in skin wound management due to inadequate fluid absorption capacity, poor antimicrobial efficacy, and lack of bioactive components. To address these challenges, this study developed an innovative microporous multifunctional composite foam dressing (pOBC/CP/HA) via a novel in situ gas formation strategy applied to oxidized bacterial cellulose (OBC). This methodology generated microporous OBC (pOBC) by inducing bubble formation through a chemical reaction. TEMPO-mediated carboxylation and structurally regulated pOBC matrix facilitated the homogeneous incorporation of cationic chitosan particles (CP) and anionic hyaluronic acid (HA), yielding a composite material with synergistically enhanced performance. Comprehensive characterization studies revealed that the pOBC microporous structures played a pivotal role in determining the functionality of pOBC/CP/HA. Compared with OBC-based foams, pOBC/CP/HA showed significantly enhanced mechanical strength, fluid absorption, antimicrobial activity, and biofunctionality. The microporous composite dressing effectively promoted hemostasis, inflammation modulation, angiogenesis, and wound closure in a rat model. In vivo results demonstrated that treated wounds achieved an 82.9 % closure ratio by day 7 and attained complete re-epithelialization within 14 days. This study demonstrates the capability to enhance composite performance by manipulating the microstructure of OBCs and systematically elucidates the role of structural parameter differences in regulating biological responses.
研究领域:
生物材料
·
生物医学工程
·
伤口愈合
·
纳米技术
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）