COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Xujie Wang,Congde Qiao,Song Jiang,Libin Liu,Jinshui Yao
The soaking strategy with the Hofmeister effect has been proposed to fabricate gelatin- based hydrogels with excellent properties. However, the modulation mechanism of hydrogels lacks in-depth study. In this work, we studied in detail the effects of Hofmeister ions on the structural, thermal, viscoelastic and mechanical properties of gelatin hydrogels. The results showed that kosmotropic anions (Cit 3− , SO 4 2− , H 2 PO 4 − and S 2 O 3 2− ) enhanced hydrogen bonds and hydrophobic interactions between gelatin molecules, resulting in increases in the length and content of triple helices and thus improving the properties of gelatin hydrogels. In contrast, chaotropic anions (I − and SCN − ) weakened the interactions between gelatin molecules, and thus attenuated the properties. Based on the Hofmeister effect, we successfully fabricated gelatin poly N-methylolacrylamide (PNMA) double network hydrogels with shape memory properties. The Hofmeister effect provides an excellent route for the rational design and fabrication of functional gelatin-based hydrogels.
研究领域:
材料科学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 30
·13579-13584
·
IF 3.591
Lulu Pan,Jianfeng Ban,Tiwen Xu,Ruiquan Liu,Shaorong Lu
A new type of sisal-based shape memory polyurethane foam (SMPU-PSF) was prepared by the chemical cross-linking of hydroxyl groups on sisal cellulose (PSF) with polycaprolactone and MDI, which used PSF as the active site, silicone oil as the stabilizer, and water as the foaming agent. The effects of different sisal microcrystalline contents on the thermal properties of SMPU-PSF were systematically studied using FT-IR, TG, and DSC, and the size and morphology of vesicles was observed using SEM. The mechanical properties of SMPU-PSF were studied via a compression test at room temperature. However, the shape memory process of SMPU-PSF was observed by means of thermal stimulation. The results showed that the SMPU-PSF has a good shape memory, high recovery rate, and good thermal stability, and its maximum decomposition temperature is about 360 °C. This work demonstrates that the new sisal-based shape memory polyurethane foam will have many applications in new smart science.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Lin-feng Han,Xue Geng,Lin Ye,Ai-ying Zhang,Zeng-guo Feng
In this study β-cyclodextrins (β-CDs) were reacted with 1,6-diisocyanatohexane (HDI) end-capped poly (ε-caprolactone) (PCL) diols (M n = 10–80 kg/mol) to give access to β-CD terminated PCLs (PCL-CDs). At the same time an adamantine terminated PCL (P2Ad) was synthesized from the reaction of a PCL diol (M n = 2 kg/mol) with 1-adamantyl isocyanate and an adamantine end-capped hexane (HAd) was prepared from the reaction of HDI with 1-adamantyl amine. Subsequently PCL-CDs and their mixtures with HAd and P2Ad at a 95:5 feeding mass ratio were dissolved in hexafluoroisopropanol and cast into films. The dried films were characterized by means of mechanical property, shape memory, DSC and DMA measurements to reveal their phase-separation mechanism and solvent-free inclusion complexation. It was shown that attaching β-CDs to two ends of PCL diols leads to the new phase-separation morphology in the PCL-CDs matrix making a great contribution to the mechanical and shape memory properties. Adding HAd and P2Ad further enhances the mechanical and shape memory properties evidencing the occurrence of solvent-free inclusion complexation between β-CD and Ad-terminated PCLs.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wenbo Shen,Bin Du,Haitao Zhuo,Shaojun Chen
In this study, an Epoxy/POSS-liquid crystalline azobenzene-Poly (ethylene-co-vinyl acetate) (Epoxy/POSS-Azo-EVA) composite was prepared via the thermal curing of epoxy monomers and multi-functional thiol-containing Polyhedral oligomeric silsesquioxane (POSS) in an EVA matrix. The EVA matrix afforded the composite with shape memory performance. Epoxy/POSS polymer was uniformly dispersed in the matrix to act as a rigid skeleton, leading to the improvement of the mechanical properties and shape memory performance of the composite. Liquid crystalline azobenzene as the photosensitive component provided the inner stress to render the composite film with photo-induced shape-deformation behavior under UV light . The composite film not only exhibited thermal- and light-responsive programmable shape-memory behavior stimulated by heat and light, but also was recyclable and reprocessable. Moreover, the recycled composite film was processed into different functional devices. A flexible photomechanical device based on the recycled Epoxy/POSS-Azo-EVA composite film was fabricated, and the soft device deformed into a hook-shape under UV light and hooked an object whose weight is larger than that of the device. A smart wire was also prepared via assembling a stretched recycled Epoxy/POSS-Azo-EVA composite film and a copper foil by adhesive. The wire could control the status of a circuit via changing its shape under UV light and maintain the status after the removal of light. The functional devices described in this work only needed a short time of UV irradiation during a work cycle, and the devices still held the temporary shape in the absence of UV irradiation. The recyclable and reprocessable Epoxy/POSS-Azo-EVA composite film in this work could provide a creative approach for the fabrication of novel photomechanical devices and soft robotics with energy-saving, intelligence, recyclability , and sustainability.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Materials
·
2022
·Vol. 17
·期 6
·065022
·
IF 4.103
Xiaohu Chen,Zuoxun Huang,Qing Yang,Xiyang Zeng,Ruqing Bai,Li Wang
This study developed a biodegradable composite porous polyurethane scaffold based on polycaprolactone and polyethylene glycol by sequential in-situ foaming salt leaching and freeze-drying process with responsive shape changing performance. Biomineral hydroxyapatite (HA) was introduced into the polyurethane matrix as inorganic fillers. Infrared spectroscopy results proved a successful synthesis, scanning electron microscopy showed that the scaffold's porosity decreased with the addition of HA while the average pore size increased. X-ray diffraction and differential scanning calorimetry showed that the addition of HA lowered the melting point of the scaffold, resulting in a transition temperature close to the human body temperature. From the bending experiments, it could be demonstrated that PUHA20 has excellent shape memory performance with shape fixity ratio >98.9% and shape recovery ratio >96.2%. Interestingly, the shape-changing capacity could be influenced by the porous structures with variation of HA content. The shape recovery speed was further accelerated when the material was immersed in phosphate buffered saline at 37 °C. Additionally, in vitro mineralization experiments showed that the scaffold incorporating HA had good osteoconductivity, and implantation assessment proved that scaffolds had good in vivo biocompatibility. This scaffold is a promising candidate for implantation of bone defects.
研究领域:
生物材料学
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骨科医学
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER TESTING
·
2023
·
IF 5.1
Minzimo Song,Shenghua Li,Guiyou Zhu,Jianwei Guo
It is valuable research to improve the compatibility and toughness of PLA/PCL blends while endowing them with shape memory & 4D printing capability. In this work, lactic acid/caprolactone-modified chitosan (mCS) was used to connect the amorphous region of PLA and PCL to achieve compatibilisation, toughening and 4D printing shape memory ability. The effects of different mCS additions on the morphology, crystalline behaviour, and thermal properties of PLA/PCL blends were observed to study the mechanism of compatibilisation and toughening. Adding 0.5 g mCS into 10 g PLA/PCL blends had the best compatibilisation and toughening effect. At the same time, the blends with this addition ratio had the best shape memory performance after 4D printing. The shape fixity and shape memory ratios of the 4D printing model were as high as 100% and 94.5%, respectively. This work provides a new way to fabricate biomedical devices and bionic components with 4D printing.
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
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 9
·1-10
·
IF 2.8
Tian Guangming,Zhao Shuo,Pan Longkai,Yang Dong,Ma Jianhua
Poly(ε-caprolactone) (PCL)-based semi-crystalline polymers are shape memory polymers that have been extensively used in various applications ranging from biological, soft robots and flexible electronic devices. Despite the large number of studies aiming at constructing the well-defined crosslinked polymer networks, detailed investigations in terms of structural factors that influence the thermal-mechanical and shape memory properties are still poorly understand and investigated. In this work, PCL crosslinked networks with different molecular weight of diacrylate PCL macromonoter (M n ) are prepared via base-catalyzed thiol-ene Michael addition. The results indicate that the melting temperature, the crystallization temperature and the crystallinity of the polymer networks exhibit an upward trend with increment of M n . Besides that, the tensile strength and shape memory properties are also correlated with M n . Controlled-strain DMA characterization on shape memory properties show that the cPCL-10000 network exhibits the most remarkable shape fixity and shape recovery ratio, indicative of lowering cross-linking density and chains mobility. In particular, permanent shape reconfiguration can also be achieved by triggering transesterification within the same polymer network, and a possible molecular mechanism responsible for the elasticity-based shape memory effect and plasticity-based permanent shape reconfigurability is proposed and combined to present the 2D-to-3D shape-morphing behaviors.
研究领域:
材料科学
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高分子化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chang Li,Qingrui Dai,Jiaxin Jiang,Weidong Wu,Dong Yu Zhu,Xueqing Qiu
Ongoing innovation in bio-based plastics aims to meet more economical and diverse societal needs. However, the dependence on a single biomass source and the generally inadequate wet stability and moisture mechanical properties of traditional bio-based plastics severely limit their competitiveness. We have developed a high mechanical performance, fully bio-based, thermoset in-suit plastic from an almost worthless agricultural and forestry waste (eucalyptus) through a simple and environmentally friendly deconstruction-reconstruction strategy. In this process, the hydrogen and covalent bonds in the lignin and cellulose of eucalyptus are broken and then reorganised through dynamic covalent bonds. The resulting eucalyptus-based plastic exhibits high mechanical strength, excellent water resistance, UV ageing resistance, photothermal performance and light/heat controllable shape memory properties. By preserving the original structure of the lignin and cellulose, its natural degradability is ensured. This strategy for developing full-component plastics from solid agricultural and forestry waste offers a new approach to producing more competitive fully bio-based plastics.
研究领域:
材料科学
·
林业科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 305
·期 1
·1900578
·
IF 3.038
Tianqi Chen,Liang Fang,Chunhua Lu,Zhongzi Xu
Few thermoplastic polyurethane (TPU) blending materials are reported to tune shape-memory capability, self-healing ability, and recyclability as well as mechanical property due to the different requirement of phase morphologies. This work focuses on how reversible epoxy domains affect the structures and properties of TPUs that contain disulfide bonds in main chains. The blended epoxy oligomers with dangling furan groups are miscible with the TPU. Self-healing efficiency can be improved by such miscible epoxy oligomers that are also beneficial for shape recovery but harmful for shape fixation. In the presence of bis(4-maleimidophenyl)methane (BMI), crosslinked epoxy domains phase separate from the TPU matrix to form microscale domains after the Diels–Alder (DA) reaction between furan groups and maleimide groups in BMI. Elastic modulus and tensile strength of TPU are greatly improved in comparison with pristine TPU and TPU/epoxy blends without BMI. The phase-separated domains deteriorate the self-healing, and the presence of phase-separated microdomains facilitates the shape fixation but deteriorates the shape recovery. This work is not only useful to further understand the relation between structures of polymer blends with intelligent features, but also offers a useful approach to adjust the properties and capabilities of TPU in a cost-effective manner.
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
Materials Today Communications
·
2022
·
IF 3.662
Zhihui Lei,Chengyi Song
This work presents a new concept of incorporating temperature-dependent reversible adhesion and shape memory performances into the application of three-dimensional thermal management. Both the two performances root in the temperature-triggered crystallization characteristic of poly(ε-caprolactone) (PCL). The dynamic interfacial bonding helps to reduce the thermal contact resistance of polymer-based composites to 0.085 K·cm 2 ·W −1 , and the shape memory ability can be adapted to various heat sources with complex structures. The cooperation of adhesion and shape memory properties endows the PCL-based composites with more advantages than the traditional matrixes in a wide range of applications including thermal management, flexible electronics, and wearable devices .
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 217
·期 13
·1439-1447
·
IF 2.495
Chao Li,Jinyue Dai,Xiaoqing Liu,Yanhua Jiang,Songqi Ma,Jin Zhu
The bio-based diamine and epoxy monomer derived from isosorbide are synthesized. Especially, the diamine is obtained using microwave assistant thiol-ene coupling reaction in the aqueous media and the influence of reaction parameters, such as initiator content and reaction time, are investigated. After curing the synthesized epoxy monomer together with the diamine, properties of the cured resins are studied by differential sscanning calorimetry, dynamic mechanical analysis, and thermogravimetric analyzer. Results demonstrate that the cured resin has good shape fixity, good shape recovery, and satisfied thermal stability despite the presence of heteroatoms. This bio-based epoxy resin shows great potential to be used as a candidate for shape memory material. Considering the bio-based feedstock and environmental friendly synthetic process, a “green + green” strategy to prepare thermosetting resins with advanced properties is provided in this paper.
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
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 3
·e4177
·
IF 2.319
Shaohua Wen,Yongfei Li,Weixing Chen,Yaping Lei,Chunyan Luo,Yonggang Hou
A series of L-lactide (LLA), 1,3-trimethylene carbonate (TMC) and glycolide (GA) terpolymers (LTG) of different monomer molar ratios were synthesized by using ring-opening copolymerization. An effective and low-toxic zirconium (IV) acetylacetonate Zr(Acac) 4 was used as catalyst. The viscosity-average molecular weights ( M η ) of obtained polymers were all above 2.2×10 4 g/mol. The chemical structure and viscosity of terpolymers were confirmed by Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance ( 1 HNMR), 13 C nuclear magnetic resonance ( 13 CNMR) and an Ubbelohde viscometer. The thermal and mechanical properties were investigated by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and stress-strain measurements. Results suggested that all terpolymers were amorphous and showed good thermal stability. Also it was found that elongation increased with the decreasing of LLA unit. More importantly, terpolymers displayed shape memory property when deformation temperatures were 14-15 °C above T g .
研究领域:
高分子化学
·
材料科学
✓ 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）