PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Luntao Wang,Leping Deng,Dawei Zhang,Hongchang Qian,Cuiwei Du,Xiaogang Li,Johannes M.C. Mol,Herman A. Terryn
A shape memory composite (SMC) coating with a self-healing ability was prepared by a facile method based on a thermoresponsive shape memory polymer (SMP) that utilized carnauba wax microparticles as the healing agent. Damages to the SMC coating was healed via heating, which triggered a two-step healing mechanism consisting of defect closure through a shape memory effect at 65 °C and then defect sealing by molten wax at 90 °C. The surface morphologies of the scratched and healed coatings as well as a wax-free SMP coating were first studied by optical stereomicroscopy and scanning electron microscopy (SEM). To assess the recovery of the coating’s barrier properties, macroscopic and localized information was obtained by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM), respectively. The healing performance was also evaluated by comparing the macroscopic morphologies of the intact, damaged and healed coatings after long-term immersion. The results from both tests were in agreement and confirmed the key roles of carnauba wax microparticles in the complete recovery of the barrier properties of initially damaged coatings upon thermally assisted self-healing.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yongdie Deng,Fenghua Zhang,Yanju Liu,Shiqi Zhang,Huiping Yuan,Jinsong Leng
Repair of articular cartilage defects is a major challenge in orthopedic surgery due to the deficient self-regeneration capability. Cartilage tissue engineering scaffolds provide a promising approach to cartilage defect repair. Proper mechanical properties, interconnected internal structure, customized shape, and minimally invasive treatment are urgent requirements for a qualified cartilage scaffold. Here, a shape memory composite used for cartilage defects is prepared by adding nanohydroxyapatite into a shape memory polyurethane matrix, exhibiting good mechanical properties and biocompatibility. Based on its rheological properties, the composite melt can be printed into 4D printed structures with high precision and quality in a simple and clean way. Inspired by the structure of mangroves, a bionic 4D printed cartilage scaffold is designed and manufactured, presenting a good shape memory performance at a temperature close to body temperature. The 4D printed cartilage scaffold can expand from a conveniently insertional shape to a deployed shape to match defect, providing a novel idea for the personalized and minimally invasive treatment of cartilage defects.
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
Nano Research
·
2021
·Vol. 15
·期 2
·1383-1392
·
IF 8.897
Yan Nina,Zheng Zhiyu,Liu Yunliang,Jiang Xizhi,Wu Jiamin,Feng Min,Xu Lei,Guan Qingbao,Li Haitao
As photothermal conversion agents, carbon nanomaterials are widely applied in polymers for light-triggered shape memory behaviors on account of their excellent light absorption. However, they are usually derived from non-renewable fossil resources, which go against the demand for sustainable development. Biomass-derived carbon nanomaterials are expected as alternatives if they are designed with good dispersibility as well as splendid photothermal properties. Up to date, very few researches focused on this area. Herein, we report a novel light-triggered shape memory composite by incorporating renewable biomass-derived carbon nanomaterials into acrylate polymers without deep purification and processing. These functionalized carbon nanomaterials not only have stable dispersion in polymers as fillers, but also can endow the polymers with excellent and stable thermal and photothermal responsive properties in biological friendly environment. With the introduction of biomass-derived carbon nanomaterials, the mechanical properties of the composites are also further enhanced with the formation of hydrogen bonding between the carbon nanomaterials and the polymers. Notably, the doping of 1% carbon nanomaterials endows the polymer with sufficient hydrogen bonds that not only exhibit excellent thermal and photothermal responsive properties, but also with enough space for the motion of chains. These properties make such composite a promising and safe candidate for shape memory applications, which provide a new avenue in smart fabrics or intelligent soft robotics.
研究领域:
材料科学
·
高分子化学
·
可持续发展
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 51
·2205301
·
IF 15.153
Jiasheng Rong,Jianxin Zhou,Yucheng Zhou,Cong Hu,Luxian Li,Wanlin Guo
Flexible intelligent materials are desired to effectively regulate their own deformation and accurately sense their immediate morphology at the same time. Graphene foam is an attractive material for strain sensing and electrical/thermal performance control due to its outstanding mechanical, electrical, and thermal properties. However, graphene-foam-based materials with both strain sensing and deformation control capabilities are rarely reported. Here, a multiscale design of graphene foam with a single-layer-graphene-dominated microstructure and resilient 3D network architecture, which leads to exceptional strain sensing performance as well as modulation ability of the electrical and thermal conductivity for shape memory polymers, is reported. The graphene foams exhibit a strain detection limit of 0.033%, a rapid response of 53 ms, long-term stability over 10 000 cycles, significant thermoacoustic effect, and great heat-generation and heat-diffusion ability. By combining these advantages, an electro-activated shape-memory composite that is capable of monitoring its own shape state during its morphing process, is demonstrated.
研究领域:
材料科学
·
传感器技术
·
智能材料工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Xiaojian Jiang,Hao Yu,Haohao Lu,Yinsong Si,Yubing Dong,Yaofeng Zhu,Chen Qian,Yaqin Fu
Smart electromagnetic interference (EMI) shielding materials that enable dynamical adjustment of electromagnetic wave transmission are highly desirable for various applications. Nevertheless, ordinary materials show nonadjustable EMI shielding performance after deployment. Herein, an anisotropic smart EMI shielding composite is presented, which shows tunable EMI shielding effectiveness by rotation, shape memory, and simple stacking. The composite possesses a sandwich structure consisting of two graphene fibrous films (GFFs) with intermediate shape memory poly(ethylene-co-vinyl acetate) (EVA). Owing to the aligned graphene fibers of GFF, the GFF/EVA composite showed anisotropic mechanical property, shape memory property, and shielding effectiveness. The composite shows high tensile strength but declined shape memory property in the axial direction (0°) of the graphene fibers. In the 0° direction of the GFF/EVA composite, a total shielding effectiveness (SET) of >40.8 dB in the X-band is observed, which is much higher than that in the 90° direction (vertical, <8.1 dB). The rotation-modulated EMI shielding of GFF/EVA is achieved by the anisotropy-dependent EMI shielding performance. Moreover, tunable EMI shielding is demonstrated through the shape memory process of the composite and the average SET can be adjusted in the range from 43.2 to 33.1 dB by fixing a tensile strain from 0 to 100%. Furthermore, the EMI shielding of the multilayered composite can be modulated by stacking individual GFF/EVA composites at different angles. The smart GFF/EVA composite with tunable and function-switchable features is demonstrated, which will contribute to the development of smart EMI shielding materials and devices for electromagnetic applications in various fields.
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
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 12
·1659-1667
·
IF 2.99
Yan Wang,Xianqiang Pei,Lin Xia,Zhancheng Zhang,Qihua Wang,Tingmei Wang
In this paper, we present an efficient and green extraction process for Eucommia ulmoides gum (EUG) to solve the tricky problems in separation and precipitation, providing a new idea for the industrialization of EUG extraction. Subsequently, the obtained EUG was blended with low density polyethylene (LDPE) and zinc methacrylate (ZDMA) to fabricate novel shape memory composites with both covalent and ionic crosslinking networks. It was found that the improvement in mechanical performance and enhancement in shape recovery ability of the EUG/LDPE/ZDMA composites was attributable to the Zn 2+ -based ionic crosslinks. The EUG/LDPE/ZDMA shape memory composites could be candidates in the production of medical fixing materials, hot-shrinkable tubes and packaging products. © 2021 Society of Chemical Industry
研究领域:
材料科学
·
生物材料
·
绿色化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yongdie Deng,Fenghua Zhang,Menglu Jiang,Yanju Liu,Huiping Yuan,Jinsong Leng
4D printing is an advanced manufacturing technology combining additive manufacturing with smart materials. Based on light-active shape memory composites, smart medical structures with remote control capability, therapeutic function, and biocompatibility are hopefully fabricated by 4D printing. Here, a multifunctional composite with good mechanical properties, biocompatibility, and light-active shape memory performance is prepared by incorporating gold nanoparticles into a shape memory polyurethane matrix. The composites demonstrate a rapid and stable light-thermal effect, which can achieve localized and controlled breast tumor ablation, providing an approach to hyperthermia treatment for cancer cells. By directly bioprinting the composite melt, a series of 4D-printed structures are manufactured accurately in a convenient, clean, and safe way, which show a fast autonomous light-driven shape recovery process. The examples of a 4D-printed soft tissue scaffold and intraluminal scaffold can expand from a conveniently insertional shape to an expanded shape under light exposure. The proposed strategies provide great inspiration for customized multifunctional light-thermal therapeutic structures for minimally invasive treatment.
研究领域:
生物医学工程
·
材料科学
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Quanxiang Sun,Dechuang Zhang,Xian Tong,Jianguo Lin,Jixing Lin,Yuncang Li,Cuie Wen
Ti–Nb alloys have great potential in biomedical applications as bone-implant materials due to their low elastic modulus, superelasticity, high corrosion resistance, and good biocompatibility. However, the low yield strength and poor superelasticity of Ti–Nb alloys restrict their practical clinical applications. Here, we report the mechanical properties and superelasticity, corrosion behavior, and biocompatibility of a Ti–26 at.% Nb–1.2 vol.% TiC (Ti–26Nb–1.2TiC) shape memory composite (SMC) prepared by vacuum arc melting and hot rolling. The yield strength, critical stress for inducing martensitic transformation, and elongation of the Ti–26Nb–1.2TiC SMC and a Ti–26Nb alloy were 460 and 337 MPa, 251 and 115 MPa, and 27.2% and 24.1%, respectively. The recovery rate of the SMC under 4% pre-strain reached 91.4%, which was 1.2 times that of the Ti–26Nb. Electrochemical tests in Hanks’ solution revealed that the corrosion current density, passive current density, and corrosion rate of the SMC were lower than those of the Ti–26Nb. Both the Ti–26Nb alloy and Ti–26Nb–1.2TiC SMC showed good cell viability with grade 0 cytotoxicity in relation to MG-63 osteosarcoma cells.
研究领域:
材料科学
·
生物医学工程
·
冶金学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 39
·16680-16689
·
IF 7.79
Li Wang,Xiyang Zeng,Guilong Yan,Xiaohu Chen,Kun Luo,Shiyi Zhou,Peicong Zhang,Junfeng Li,Tuck-Whye Wong
Due to the complexity of surgery for large-area bone injuries, implanting a large volume of materials into the injury site remains a big challenge in orthopedics. To solve this difficulty, in this study, a series of biomimetic hydroxyapatite/shape-memory composite scaffolds were designed and synthesized with programmable pore structures, based on poly(ε-caprolactone) (PCL), polytetrahydrofuran (PTMG) and the osteoconductive hydroxyapatite (HA). The obtained scaffolds presented various pore structures, high connectivity, tunable mechanical properties, and excellent shape memory performance. Moreover, the mineralization activity of the developed scaffolds could enhance the formation of hydroxyapatite and they showed good biocompatibility in vitro. The in vivo experiments show that scaffolds could promote the formation of new bone in critical size cranial defects. The programmable porous scaffold biomaterials exhibited potential application promise in bone regeneration.
研究领域:
骨科
·
生物材料
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Yuting Ouyang,Qiu Zhang,Xiukun Liu,Ruan Hong,Xu Xu,Shaorong Lu,Yuqi Li
Different ionic liquid modified graphene nanosheets (IG) were induced into polyimide (PI) to improve the tribological, thermal, and mechanical properties of shape memory IG/PI composites. The results demonstrated that when using 1-aminoethyl-3-methylimidazole bromide to modify graphene nanosheets (IG-1), the laser-driven shape recovery rate of IG-1/PI composites (IGPI-1) reached 73.02%, which was 49.36% higher than that of pure PI. In addition, the IGPI-1 composite materials reached the maximum shape recovery rate within 15 s. Additionally, under dry sliding, the addition of IG can significantly improve the tribological properties of composite materials. IGPI-1 exhibited the best self-lubricating properties. Compared with pure PI, the friction coefficient (0.19) and wear rate (2.62 × 10–5) mm3/Nm) were reduced by 44.1% and 24.2%, respectively, and the T10% of IGPI-1 increased by 32.2°C. The Tg of IGPI-1 reached 256.5°C, which was 8.4°C higher than that of pure PI. In addition, the tensile strength and modulus of IGPI-1 reached 82.3 MPa and 1.18 GPa, which were significantly increased by 33.6% and 29.8%, respectively, compared with pure PI. We hope that this work will be helpful for the preparation of shape memory materials with excellent tribological, thermal, and mechanical properties.
研究领域:
材料科学
·
复合材料
·
摩擦学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Virtual and Physical Prototyping
·
2024
·
IF 10.2
Beizhi Chu,Xin Cui,Xing Dong,Yu Li,Xueqing Liu,Zhan Guo,Yumin Xia,Shuohan Huang,Jianming Zhang,Yuwei Chen
Improving the sustainability and processability of shape memory composites is key to expanding their applications. This work introduces a novel bio-based shape memory composite resin with renewable cellulose nanocrystals, suitable for stereolithography (SLA) printing. We prepared epoxy soybean oil-based composites by incorporating Itaconic acid monomethyl ester (IAME) modified cellulose nanocrystals (CNCs-IAME) into IAME modified epoxy soybean oil (IESO). The CNCs-IAME/IESO composite resin, with a viscosity of 1.01–1.22 Pa•s, is ideal for SLA printing. Adding 0.75 wt% CNCs-IAME particles enhances mechanical properties, yielding a tensile strength of 19.54 MPa and elongation at a break of 34.03%. Demonstrated applications include flexible supports and temperature-responsive sensors. This innovative composite offers excellent sustainability and SLA-printability, showing great potential for new bio-based heat-activated shape memory materials.
研究领域:
材料科学
·
可持续发展
·
3D 打印技术
✓ 已验证
产品关联
DOI
高影响因子
Pigment & Resin Technology
·
2025
·
IF 1.5
Xiaojian Jiang,Zhonggui Zhang,Jiafei Cheng,Yongjie Ai,Ziyue Zhang,Shuolei Wang,Shi Xu,Hongyu Gao,Yubing Dong
Purpose This study aims to fabricate the reduced graphene oxide (rGO)/ethylene vinyl acetate copolymer (EVA) composite films with electric-driven two-way shape memory properties for deployable structures application. The effect of dicumyl peroxide (DCP) and rGO on the structure and properties of the rGO/EVA composite films were systematically investigated. Design/methodology/approach The rGO/EVA composite films were fabricated by melting blend and swelling-ultrasonication method, DCP and rGO were used the crosslinking agent and conductive filler, respectively. Findings The research results indicate that the two-way shape memory properties of rGO/EVA composite films were significantly improved with the increase of DCP content. The rGO endowed rGO/EVA composite films with excellent electric-driven reversible two-way shape memory and anti-ultraviolet aging properties. The sample rGO/EVA-9 can be heated above Tm within 8 s at a voltage of 35 V and can be heated above the Tm temperature within 12 s under near-infrared light (NIR). Under a constant stress of 0.07 MPa, the reversible strain of the sample rGO/EVA-9 was 8.96% and its electric-driven shape memory behavior maintained great regularity and stability. Research limitations/implications The rGO/EVA composite films have potential application value in the field of deployable structures. Originality/value With the increase of DCP content, the two-way shape memory properties of rGO/EVA composite films were significantly improved, which effectively solved the problem that the shape memory properties of EVA matrix decreased caused by swelling. The rGO endowed rGO/EVA composite films with excellent electric/NIR driven reversible two-way shape memory properties.
研究领域:
材料科学
·
智能材料
·
高分子化学
✓ 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）