JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 23
·52287
·
IF 3.057
Jinjing Wang,Yi Zhang,Jianfei Sun,Zhen Jiao
Multi-modal porous scaffolds can promote bone regeneration. In the present study, they were successfully fabricated from poly (lactic-co-glycolic acid) (PLGA)/superparamagnetic iron oxide nanoparticles (SPIONs) by supercritical CO 2 foaming, where SPIONs was employed as heterogeneous nucleation agent. The effects of SPION size on pore nucleation in PLGA/SPIONs nanocomposites were investigated. It was found that the addition of smaller SPIONs size caused the reduction of pore size. Multi-modal porous scaffolds could be available by controlling the SPIONs content, soaking temperature, pressure, and depressurization rate. The porosity of the PLGA/SPIONs scaffolds ranged from (58.68 ± 0.62)% to (94.97 ± 0.14)% could be obtained via adjusting the supercritical CO 2 foaming conditions. Moreover, it was found that the compressive modulus and porosity of the scaffolds were strongly associated with the porous structure. This study provided a new green preparation method for magnetic scaffolds to realize the controllable adjustment of the multi-mode porous scaffolds.
研究领域:
生物材料学
·
组织工程学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Donglin Li,Wenxin Deng,Zhefeng Jin,Jiangpeng Hu,Yujia Zhao,Nuo Cao,Chao Wan,Xuhuang Chen,Peng Yu
The structure-gradient silicone rubber foam (SRF) is an advanced bionic material with potential for applications in energy-damping, triboelectric nanogenerators, and electromagnetic interference shielding. However, the production of SRFs with an adjustable gradient structure is still a significant challenge. Herein, a novel strategy combining in situ precuring of silicone rubber induced by gradient temperature fields with supercritical CO 2 foaming was developed to prepare SRFs with biomimetic gradient cellular structures. By regulating the unilateral heat source temperature and precuring time, SR samples with gradient curing degrees from 16.13% to 51.21% were achieved. Finally, a prospective structure-gradient SRF with a cell size range of 24.10–182.80 μm was successfully prepared. The energy loss coefficient of gradient SRF can be reduced by 41.65% compared with that of uniform cellular structure foam with average cell size of 31.25 μm after 50 cycles. Gradient SRFs show significantly enhanced mechanical performance, recoverability, and elasticity. Besides, the underlying mechanism for generating this gradient cellular structure was clarified.
研究领域:
材料科学
·
仿生学
·
能源材料
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 22
·e55444
·
IF 2.7
Donglin Li,Zi Wei,Lifen Li,Chang Peng,Lunneng Xu,Siwen Bi,Xuhuang Chen,Peng Yu
In this work, a facile in situ precuring and supercritical CO 2 (sc-CO 2 ) foaming technology is proposed to fabricate silicone rubber foam (SRF) with a tunable cell structure. Uncured silicone rubber is put into the autoclave to saturate sc-CO 2 directly, which not only shorts the saturation time but also accelerates the curing reaction in the precuring process. In the foaming process, cell nucleation is triggered by rapid release of pressure. The cell structure of SRF samples with cell size range of 9.45 to 128.09 μm, cell density range of 3.5 × 10 5 cells/cm 3 to 5.7 × 10 8 cells/cm 3 , and porosity range of 28.35% to 77.28% are successfully fabricated by controlling of precuring time, saturation pressure and foaming temperature. To guarantee the dimensional stability and optimize surface quality of SRF samples, in situ post-curing process is implemented within the foaming mold. With the increase of cell size from 9.91 to 128.09 μm, the compressive stress at strain of 75% decreases from 2.19 to 0.61 MPa, while the energy loss coefficient reduces from 35.4% to 16.9%, exhibiting excellent compression recovery steady. The new technique integrates the precuring, foaming process and post-curing into an autoclave to simplify the SRF procedure.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Linqiong Xu,Shaoping Qian,Wenge Zheng,Yongkang Bai,Yongqing Zhao
The cellulose acetate/poly(ethylene glycol) (CA/PEG) blend with a weight ratio of 50/50 was solution-blended followed by supercritical carbon dioxide foaming and the PEG leaching process. Interestingly, a bimodal open-celled structure (BMOCS) with networks is obtained. Large cells are developed from the cell nuclei formed during rapid depressurization, while small cells are formed by leaching of PEG out from the blend foams. The open-celled structure with networks is developed by the synergistic effect of leaching of PEG and rupture of some cell wall. The influences of foaming temperature and pressure on cellular structure for CA and CA/PEG blend foams were studied. The foam densities of blend foams after leaching PEG (0.18–0.41 g/cm3) are higher than those of CA foams (0.13–0.20 g/cm3). The leaching contents of PEG out from CA/PEG blend foams are in the range of 89.0%–99.1%.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Haoyu,Zhang Xiaoqi,Zhang Weiwei,Song Changyuan,He Suqin,Huang Miaoming,Liu Hao,Xu Wanlin,Zhu Chengshen,Liu Wentao
Lightweight, friction-resistant polyamide foam with exceptional mechanical properties represents a novel material with significant potential. In this study, we synthesized a series of high-toughness, bio-based polyamide materials characterized by low melting points, extensive processing temperature ranges, and robust low-temperature resistance. This was achieved through the copolymerization of bio-based components, including glutaraldehyde, sebacic acid, and caprolactam. Subsequent foaming using supercritical CO 2 was performed, substantially reducing foaming conditions and broadening the foaming range. Optimal foaming conditions were simulated, resulting in the production of various polyamide foams with differing foaming multiplicities, all exhibiting impressive tensile strength, compressive strength, low-temperature resistance, and friction resistance. Additionally, this study simulated the thermal insulation performance of polyamide foams across a wide array of practical working conditions. The results demonstrated that these foams possess low thermal conductivity and excel in actual thermal insulation performance. Therefore, they present significant promise as energy-saving and environmentally friendly materials in applications such as building thermal insulation, electrical insulation, and protective systems. As a sustainable solution, these bio-based polyamide foams hold great potential for advancing energy efficiency in construction, thermal management of electrical appliances, and protective applications.
研究领域:
材料科学
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环境科学
·
能源工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 29
·e54070
·
IF 3
Kai Wang,Chiyu Zhou,Yibo Zhou,Yijia Fan,Junkang Chen,Linghao Hui,Xinyuan Zhang,Jianbin Qin
High performance electromagnetic (EM) interference shielding composites are of high demand due to increasing EM wave radiation pollution. In this work, GO/NiNCs/PMMA microcellular foams with different GO/NiNCs gradient and 3D conductive filler framework were fabricated by thermal reduction and supercritical CO 2 foaming process. With the crosslink of 1D NiNCs and 2D GO sheets, GO/NiNCs framework with electrical conductivity varied from 1.15 × 10 −4 to highest 1.09 × 10 −1 S/m is fabricated, exhibiting absorption-dominated electromagnetic interference shieling effectiveness (EMI SE) of 53.62 dB and specific EMI SE of 48.44 dB g −1 cm 3 in X-band. The density of GO/NiNCs/PMMA microcellular foams achieved lowest value of 0.623 g/cm 3 . Moreover, the foams showed excellent thermal conductivity and compressive strength of 178.76 MPa, indicating excellent application potential in aerospace and electronic field. The thermoplastic polymer matrix also indicates great potential in recycle of the foam material.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Jinghao Qian,Haiying Zhan,Hao-Yang Mi,Xiao Li,Weipeng Zhong,Xinchao Wang,Chuntai Liu,Changyu Shen
Asymmetric composite foams (TCFAs) based on thermoplastic polyurethane (TPU) containing carbon nanotubes (CNTs) and Fe 3 O 4 -decorated reduced graphene oxide (Fe 3 O 4 @rGO) electrical-magnetic dual networks with oriented cell structures and a silver layer were fabricated through supercritical carbon dioxide foaming, thermal stretching and a knife coating process. The oriented cells prolonged the electromagnetic (EM) wave transmission path and induced more multiple reflections, and the asymmetric silver layer enabled a special “absorption-reflection-reabsorption” mechanism, which contributed to a high electromagnetic interference (EMI) shielding effectiveness (SE) of 89.5 dB with an A value of 0.748 at a relatively low total filler content of 1.784 vol%. By regulating the oriented cell structure and the incorporation of asymmetric design, the TCFA-1 achieved 10 times improvement in EMI SE T with a low EMI SE R of 1.27 dB. This work offers new insights into the design and fabrication strategies for high performance absorption-dominated EMI shielding foams.
研究领域:
材料科学
·
电磁学
·
纳米技术
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hao Zheng,Guoliang Guo,Xiaoqiang Pei,Pengke Huang,Xiaoling Liu,Wenge Zheng
Elastomer foams with customized multimodal cellular structures have great application requirements in advanced fields, but a simple and practical way to realize it needs to be further studied. Herein, a strategy of presetting cells into elastomers before supercritical CO2 foaming was introduced to customize the cellular structures. Typically, taking olefin block copolymers (OBC, a thermoplastic elastomer with crystalline hard segments and rubbery soft segments) foams as an example, bimodal, sandwich, and gradient multimodal cellular structures were successfully prepared. The interaction between preset cells and newly nucleated cells during foaming had been systematically studied by controlling the morphology of preset cells and foaming conditions. It was found that the configuration of preset cells and the nucleation rate of small cells in OBC foams had a significant impact on their cellular structures. Specifically, the bimodal cellular structures can improve the expansion ratio and elasticity of OBC foams, and their rebounding ability could be improved by 14%, while their energy loss coefficient would be decreased by 17% (compared to homogeneous ones in this study). Furthermore, the feasibilities of this strategy in other elastomer foams (like POE, EPDM, and EVA foams) with bimodal cellular structures were also verified, which was expected to promote the development of high-performance elastomer foams.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zheng Gong,Yichong Chen,Jie Yuan,Ling Zhao,Dongdong Hu
Lightweight, shape memory temperature-tunable, biodegradable, and reusable poly(butylene adipate-co-terephthalate) (PBAT)/polylactic acid (PLA) foams with acetyl tributyl citrate (ATBC) were prepared by a simple, green, and efficient supercritical CO2 foaming technique. ATBC reduces the glass transition temperature (Tg) of PLA in PBAT/PLA composites and, thus, decreases the switching temperature of the shape memory in PBAT/PLA foams. ATBC widens the shape memory applicable temperature range, and the applicable temperature shifts toward lower temperatures. The minimum shape memory applicable temperature is 50 °C. ATBC can also accelerate the shape recovery process. In addition, increased shape memory temperature favors the shape fixing ratio (Rf) and recovery ratio (Rr) and can shorten the shape recovery time. PBAT/PLA foam exhibits a low density of 0.16 g/cm3, an Rf of 93.6%, and an Rr of 95.2%. PBAT/PLA foam also has reusability; both Rf and Rr remain above 85% after 10 cycles.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Huan Qian,Zheng Gong,Xiulu Gao,Yichong Chen,Ling Zhao,Dongdong Hu
With the rapid development of artificial intelligence technology, intelligent sensing and monitoring is evolving from single-modality sensor data acquisition to multimodal and adaptive perception, a development that aligns with the strategies of green environmental protection and sustainable development. Machine learning-based multimodal intelligent monitoring employ smart sensors to collect diverse sensory data. The smart sensor is a biodegradable, reusable and multi-responsive shape memory PBAT/PCL foam prepared by one-step supercritical CO 2 foaming and sinter molding. The foam exhibits multi-responsive actuation under thermal, near-infrared light, and microwave stimuli. Functionally, this foam can serve as a self-sensing actuator capable of lifting up to 40 times its own weight upon external stimulation. Furthermore, it operates as a contact-separation nanogenerator with shape memory-controlled alternating current output, generating a maximum voltage of 1.3 V. As a piezoresistive sensor, the foam demonstrates a gauge factor of 25.54 and a response time of 175 ms, and stability over1,000 cycles, confirming its practicality and reproducibility. Notably, the shape memory effect enables tunable sensor sensitivity. Integration of shape memory sensor and machine learning-based multimodal intelligent recognition enables to predict with 100 % accuracy. This technology demonstrates broad application prospects in industrial equipment health management, human–machine interaction, smart healthcare, and environmental monitoring, providing innovative solutions for more precise and adaptive real-time monitoring and early warning systems.
研究领域:
材料科学
·
智能传感器
·
执行器
·
机器学习
·
柔性电子
·
环境监测
·
人机交互
·
智能医疗
·
可持续技术
·
纳米发电机
✓ 已验证
产品关联
DOI
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
危险品化学品经营许可证（带存储）