Polymers
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2024
·Vol. 17
·期 1
·89
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IF 4.7
Haozhe Wang,Yusong Gao,Zhiying Yin,Jianbin Qin,Yongsheng Zhao,Guangcheng Zhang
Bead-foaming technology effectively addresses production cycles, polymerization control, and cellular structure defects in conventional bulk foaming, especially in high-performance PMI foams. In this work, highly expandable PMI beads were synthesized based on the aqueous suspension polymerization of methacrylic acid-methacrylonitrile-tert-butyl methacrylate (MAA-MAN-tBMA) copolymers. The suspension polymerization was stabilized by reducing the solubility of MAA by the salting-out effect and replacing formamide (a common PMI foaming agent) with tBMA. The polymerization process was optimized by varying salting-out agents, dispersants, water-to-oil ratio (WOR), and stirring speed to achieve uniform bead sizes (0.2–0.4 mm) and high bead yields (>70%). The expansion ratio of the beads can be easily tuned by adjusting tBMA content and foaming time and temperature. Beads with 10%tBMA can reach up to 64 times under a free-forming process at 240 °C, which serves as an excellent precursor toward high-performance in-mold foaming PMI. The beads exhibit excellent in-mold foaming capabilities, thermal stability (Td = 392 °C), and mechanical properties. This work provides a technical foundation for the bead-foaming technology of PMI foams, reducing the cost of PMI foam production and providing the possibility to expand the application of PMI foam in civilian use.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2014
·
IF 0.74
Hai-Dong Liu,Yu Wang,Ming-Bo Yang,Qi He*
In this work, hydrophobic polyurethane foam was prepared using hy-drosilicone oil-grafted polybutadiene as soft segment via foaming technology. It was found that the hydrophobic polyurethane foams exhibited good hydrophobic capability and were regenerated easily. Of great interest, the hydrophobic polyurethane foams expand in contact with the oils. This indicates that the process of sorption by the hydrophobic polyurethane foams involves both the filling of the pores with oils and the absorption of oils by the polymer regions (polyurethane elastomer skeleton), and the adsorption capacity of the hydrophobic polyurethane foams can be enhanced by the swelling of the polyurethane elastomer skeleton. We can use this finding to improve the adsorption capacity of the hydrophobic polyurethane foams without merely changing the porosity. The effect of the swelling property of the hydrophobic polyurethane foams on the sorption capacity was further investigated. The results suggest that the hydrophobic polyurethane foams are promising in the application of oil spill recovery.
研究领域:
环境科学
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材料科学
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化学工程
·
高分子科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Liwei Sun,Ming Gao,Shaokun Tang
Design and synthesis of porous materials as efficient CO 2 adsorbents have attracted much attention to alleviate the environmental issues derived from CO 2 emission. Here a new amino acid-functionalized poly(ionic liquid) poly[1-(p-vinylbenzyl)-3-methylimidazolium glycinate] [P([VBMI][Gly])] was prepared with [VBMI][Cl] and P([VBMI][Cl]) as intermediate products. Chemical structures of the above materials are confirmed by NMR and FT-IR spectra. P([VBMI][Gly]) presents dense monolith with amorphous structure and high thermal stability. CO 2 adsorption capacity of P([VBMI][Gly]) is 104 mg CO 2 /g PIL. To further improve CO 2 adsorption performance, porous-P([VBMI][Gly]) was constructed via supercritical foaming technology for the first time. The effects of foaming conditions on the morphology and CO 2 adsorption performance of porous-P([VBMI][Gly]) were investigated. And porous-P([VBMI][Gly]) foamed at 110 °C, 30 MPa and 2 h presents uniform cell distribution and obvious porous structure. CO 2 adsorption capacity of porous-P([VBMI][Gly]) can reach up to 165 mg CO 2 /g PIL, which is significantly higher than that of pristine P([VBMI][Gly]). Compared with pristine P([VBMI][Gly]), the pore parameters of porous-P([VBMI][Gly]) are obviously improved, and the porosity and average pore diameter can reach 82.9% and 3 μm respectively. Its CO 2 adsorption capacity decreases by 25% after twelve-cycle adsorption–desorption experiments.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhouying Luo,Yang He,Ming Li,Yumeng Ge,Yisha Huang,Xia Liu,Jianwen Hou,Shaobing Zhou
Detection of circulating tumor cells (CTCs) is important for early cancer diagnosis, prediction of postoperative recurrence, and individualized treatment. However, it is still challenging to achieve efficient capture and gentle release of CTCs from the complex peripheral blood due to their rarity and fragility. Herein, inspired by the three-dimensional (3D) network structure and high glutathione (GSH) level of the tumor microenvironment (TME), a 3D stereo (3D-G@FTP) fibrous network is developed by combining the liquid-assisted electrospinning method, gas foaming technique, and metal–polyphenol coordination interactions to achieve efficient trapping and gentle release of CTCs. Compared with the traditional 2D@FTP fibrous scaffold, the 3D-G@FTP fibrous network could achieve higher capture efficiency (90.4% vs 78.5%) toward cancer cells in a shorter time (30 min vs 90 min). This platform showed superior capture performance toward heterogeneous cancer cells (HepG2, HCT116, HeLa, and A549) in an epithelial cell adhesion molecule (EpCAM)-independent manner. In addition, the captured cells with high cell viability (>90.0%) could be gently released under biologically friendly GSH stimulus. More importantly, the 3D-G@FTP fibrous network could sensitively detect 4–19 CTCs from six kinds of cancer patients’ blood samples. We expect this TME-inspired 3D stereo fibrous network integrating efficient trapping, broad-spectrum recognition, and gentle release will promote the development of biomimetic devices for rare cell analysis.
研究领域:
生物医学工程
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癌症研究
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材料科学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiao Yang,Xiaoqin Si,Luqi Pan,Xujian Li,Zhixiao Ji,Changcan Shi
In pre-hospital care, achieving rapid and effective hemostasis for arterial rupture and visceral perforation wounds remains a critical challenge. Herein, we have developed a macroporous sponge with double-network structure using foaming technique, chemical and physical crosslinking reactions, and lyophilization. The prepared sponge not only demonstrates outstanding water absorption and water-triggered shape recovery capacity, but also exhibits significantly enhanced mechanical properties due to the construction of double-network structure. Simultaneously, the sponge shortens blood clotting time (from 1354.3 ± 41 s to 473.0 ± 28 s) by concentrating blood components and regulating coagulation pathways. Particularly, the sponge possesses excellent 3D printability and can be additively manufactured through DIW technique while maintaining favorable physical properties and procoagulant potential. Animal experiments have shown that sponges prepared by different processing method exhibit desirable hemostatic performance in SD rat/rabbit liver volume defect and artery complete transection hemorrhage. The construction of double-network provides promising avenue for developing high-performance sponge for massive and noncompressible hemorrhage, and the proposed DIW printing strategy for hemostatic sponge may revolutionize processing methods and provide a potentially feasible approach for designing and preparing customized sponges.
研究领域:
材料科学
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生物医学工程
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止血
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组织工程
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增材制造
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 31
·
IF 12.5
Yuqing Chang,Yichen Tian,Jiacheng Wang,Jingyi Zhao,Lei Chen,Shuhua Kang,Qiang Lu,Xiaoya He,Qiang Zhang
Biomass-based foams present a promising alternative to conventional plastic foams. However, many reported biomass-based foams are composed of nondegradable components and are mechanically weak and brittle. We proposed a hybrid biomass-driven foaming strategy that used specially designed cellulose nanofibers and sodium caseinate to synergistically create stable wet foams and form gas-impermeable bubble interfaces to prevent structural collapse during oven drying. The foams exhibited high tensile stress (~400 kPa) comparable to that of brittle foams and had excellent ductility, with an elongation of 137.0%. The foams also displayed outstanding cyclic elastic behavior, retaining more than 90% of their compressive stress after 100 cycles. In addition, the foams were water-weldable, recovering 87.3% of their original tensile stress and nearly 100% of their elongation, allowing them to be tailored into customized geometric structures. A roll-to-roll casting process was used to produce continuous foam rolls, demonstrating successful scalability. This study provides an advanced formulation for fabricating fully degradable biomass-based foams with superior mechanical properties.
研究领域:
材料科学
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高分子科学
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可降解材料
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发泡技术
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可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Bo Wen,Gaopeng Wang,Renze Xu,Chenglong Weng,Jintao Yang
With the growing global emphasis on environmental protection, supercritical CO 2 foaming technology for biodegradable materials such as polylactic acid (PLA), poly(butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate) (PBS) and their blends has emerged as a research and application hotspot. However, the low melt strength and poor compatibility of these polymers often lead to low nucleation efficiency, cell wall rupture and coalescence, exhibiting inferior foaming performance. In this work, aiming to enhance the foamability of PLA and PLA/PBAT blends, a fluorinated chain extender, F-CE (GMA-co-DFHA-co-MMA), was designed and synthesized. Through the reactive melt blending, F-CE effectively enhanced the melt strength of PLA and interfacial adhesion between PLA and PBAT, leading to a significant improvement in foaming performance. Additionally, the fluorine groups in DFHA demonstrated high affinity for CO 2 , providing additional heterogeneous nucleation sites for bubble formation, thereby increasing both foam expansion ratio and cell density. Notably, the F-CE/PLA foam exhibited a cell diameter of ∼13.8 μm with an exceptionally high expansion ratio of ∼35. As a contrast, pristine PLA foam shows an expansion ratio of ∼30, but with large cell diameter (∼118 μm). Although PLA foam containing CE without fluorine (CE/PLA foam) exhibits small cells with an average cell diameter of ∼13.6 μm, the expansion ratio is low (∼23). In addition, F-CE also exhibits superior performance in improving the foamability of PLA/PBAT blends. This work presents a chain extender specifically engineered for foaming applications, which functions as a highly efficient foaming additive to holistically enhance the foaming performance of polymers.
研究领域:
高分子科学
·
材料工程
·
绿色化学
·
发泡技术
·
超临界流体加工
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2019
·
IF 1.163
Hai Fu,Wei Gong,Binbin Chen,Yuxing Chen,Daming Ban,Xiaogang Yin,Xianglin Pei,Li He
Thermal expansion microcapsules were prepared by using acrylonitrile and methyl methacrylate as polymerization monomer and isooctane as the blowing agent. The structure, composition, appearance, and thermal expansion properties of microcapsules were analyzed by SEM, FTIR, TG, DSC, and TEM. The cell structure and surface quality of PP foaming composites were characterized by SEM, optical microscopy, and gloss meter. Results show that sodium chloride in the aqueous solution can significantly improve the appearance of microcapsules. At 15.1 and 19.1 wt.% sodium chloride, the appearance of microcapsules was regular. At 19.1 wt.% sodium chloride, the thermal expansion microcapsules were coated with 25.0 wt.% of the blowing agent. The microcapsules exhibit an expansion temperature of 201 °C and can remain stable after expansion. Moreover, the microcapsule shell of the data (thickest part − thinnest part)/(core diameter) decreased to approximately 0.05. The glossiness of PP/(T-5) increased to 65.6. The surface of PP/microcapsule foaming composite is smoother than that of the PP/AC foaming composites, and the pores of thermal expansion microcapsules are difficult to deform during processing.
研究领域:
材料科学
·
高分子化学
·
发泡技术
·
热性能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）