RSC Advances
·
2015
·Vol. 5
·期 55
·44435-44446
·
IF 3.84
Yangyang Chen,Funian Mo,Shaojun Chen,Yan Yang,Shiguo Chen,Haitao Zhuo,Jianhong Liu
This study reports a novel shape memory copolymer synthesized with 2-(dimethylamino)-ethyl-methacrylate (DMAEMA) and methyl-allyl-polyethenoxy-ether (TPEG) for potential biological applications. In the DMAEMA–TPEG copolymers, TPEG segments form a semi-crystalline phase that serves as the reversible phase, while DMAEMA segments form an amorphous phase containing physical interactive networks that serve as the hard phase. As the TPEG content increases, the crystallinity and the rate of crystallization increase, and the TPEG phase changes from dispersed small spherical crystals to a continuous crystalline phase. Additionally, good crystallinity of the TPEG phase endows the copolymers with good shape fixity, whereas the shape recovery decreases as the TPEG content decreases. DMAEMA–TPEG copolymers also exhibit the multi-shape memory effect with a good triple-shape memory effect. Finally, the investigation of the water contact angle illustrates that all DMAEMA–TPEG copolymers have good hydrophilicity. Thus, it is proposed that DMAEMA–TPEG copolymers might have great potential for biological applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2016
·Vol. 37
·期 3
·869-877
·
IF 1.114
Yongkang Bai,Yuejun Liu,Qihua Wang
In this work, a bio-shape memory polymer (SMP) with high performance is prepared by using cellulose acetate (CA) as raw material. The materials exhibit good mechanical properties with tensile strength and elongation at break over 46 MPa and 115%, respectively. With hydrogen bond interaction as physically cross-linked points, the materials also present excellent dual-shape memory properties with shape fixation and shape recovery ratio of about 99% and 96%, respectively. Moreover, the materials show good triple-shape memory effect. The recyclability of the materials is also investigated and the results show that the reclaimed samples still hold high mechanical and shape memory properties. With the intrinsic biocompatibility and biodegradation of CA, the materials could be an attractive candidate for applications in smart biomedical devices. Furthermore, the usage of CA as SMP could expand the view of preparing bio-SMP in future.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Haifeng Yu,Yanting Du,Jiayu Li,Songhao Zhao,Cheng Wang,Shuhong Wang,Haiyang Chang
Donor–acceptor (D–A) conjugated polymers have exhibited their utility in the fabrication of memory devices with high information storage capacity. The device performance can be effectively regulated through the appropriate pairing of the acceptor and donor moieties. Six different D–A conjugated polymers, featuring varied structures, were synthesized by using the Suzuki coupling reaction. Donor molecules such as fluorene, carbazole, and 4′-methoxytriphenylamine, as well as the acceptor molecule dipyrido[3,2-a:2′,3′-c]phenazine (dppz), were employed in this process. Interestingly, it was observed that simply increasing the ratio of donor groups did not yield improvements in device performance. On the other hand, the memory devices fabricated using these polymers as the active layers exhibited favorable ternary resistance memory behavior. Specifically, the first and second threshold voltages were impressively low, at −0.40 and −0.75 V, respectively. The OFF: ON1: ON2 current ratio reached an outstanding ratio of 1:102.90:105.47. Moreover, these devices demonstrated excellent stability with a retention time of 104 s and an endurance of 103 cycles. In conclusion, this study successfully synthesized D–A conjugated polymer with dppz as an acceptor and proved the great potential of constructing ternary memory devices using the dppz structure.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Hongming Yuan,Zaochuan Ge,Shaojun Chen,Shiguo Chen,Haipeng Yang,Haitao Zhuo
This article demonstrates a comparative investigation about the effect of diisocyanate on pyridine containing shape memory polyurethanes (Py-SMPUs), which are synthesized with N , N -bis(2-hydroxylethyl)isonicotinamide (BINA) and four different diisocyanates: 1,6-hexanediisocyante (HDI), isophorone diisocyanate (IPDI), methylene diphenyl diisocyanate (MDI), and tolylene diisocyanate (TDI). Results show that all BINA–SMPU systems have amorphous reversible phase. Comparatively, the MDI–BINA and TDI–BINA systems show higher T g ; and the HDI–BINA and IPDI–BINA systems show better thermal stability. In addition, the HDI–BINA and the IPDI–BINA systems exhibit good thermal-induced shape memory effect and good moisture-sensitive shape memory effect due to their better moisture absorption properties. Particularly, the HDI–BINA system has better response speed and better shape recovery. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40721.
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
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Shuai Yang,Yang He,Jinsong Leng
We synthesized shape memory poly(aryl ether ketone) (PAEK) and grafted carboxylic acid pyridine zwitterions onto the main chains for fabricating the zwitterionic PAEK (ZPAEK) material. ZPAEK exhibited a Tg of around 120 °C, great thermal stability, and mechanical performances, and heat-triggered shape memory behaviors, including high shape recovery ratio (over 98.7%) and fixity ratio (over 98%). Besides, we improved the hydrophilicity of PAEK by incorporating carboxylic acid pyridine zwitterions, for the first time, achieving the exceptional water-actuated shape memory behaviors for PAEK at room temperature. Furthermore, the controllable reconfiguration behaviors were achieved through the interaction between carboxylic acid pyridine zwitterions and water molecules. For the sample of any temporary shape, after absorbing water, its previous original shape was eliminated, and the deformed temporary shape could be redefined as the “original” shape to construct an unprecedented shape memory cycle, never returning to the first original shape. Additionally, the excellent triple shape memory behaviors of sample were obtained after absorbing water. After the programmable shape fixation processes, the sample of temporary shape could recover to the original shape through the two stages: one was at 110 °C, and the other was at 140 °C. We did believe the water-actuated, reconfigurable, and triple shape memory ZPAEK could be an ideal substitute material for smart sensors and actuators.
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
Insect Science
·
2022
·Vol. 30
·期 3
·829-843
·
IF 3.605
Jin-Xin Yu,Yan-Min Hui,Jun-Ao Xue,Jia-Bao Qu,Si-Quan Ling,Wei Wang,Xin-Nian Zeng,Jia-Li Liu
Studies on insects have contributed significantly to a better understanding of learning and memory, which is a necessary cognitive capability for all animals. Although the formation of memory has been studied in some model insects, more evidence is required to clarify the characteristics of memory formation, especially long-term memory (LTM), which is important for reliably storing information. Here, we explored this question by examining Bactrocera dorsalis , an agricultural pest with excellent learning abilities. Using the classical conditioning paradigm of the olfactory proboscis extension reflex (PER), we found that paired conditioning with multiple trials (>3) spaced with an intertrial interval (≥10 min) resulted in stable memory that lasted for at least 3 d. Furthermore, even a single conditioning trial was sufficient for the formation of a 2-d memory. With the injection of protein inhibitors, protein-synthesis-dependent memory was confirmed to start 4 h after training, and its dependence on translation and transcription differed. Moreover, the results revealed that the dependence of memory on protein translation exhibited a time-window effect (4–6 h). Our findings provide an integrated view of LTM in insects, suggesting common mechanisms in LTM formation that play a key role in the biological basis of memory.
研究领域:
昆虫学
·
认知神经科学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2019
·
IF 3.771
Lan Du,Jiang Dai,Zhi-Yuan Xu,Ke-Ke Yang,Yu-Zhong Wang
Shape memory polymers have been widely applied in actuators and space deployable materials due to the shape-change feature under external stimuli. Actually, it will show greater potential in smart materials if the shape memory technique creatively combined with other functions. Herein, a shape and color memory material was prepared by incorporating a photochromic molecule spiropyran into the shape memory poly( ε -caprolactone) network. Integrating shape memory effect with color variance in this network, we firstly mimic a blooming rose with color change as it warms through specific assembly and procedures. Assisted with dynamic bond exchange of urethane and ester linkages, surface patterning, and molding technology, a series of application models can execute SME accompanied with color change were demonstrated, including high security information storage material, anti-counterfeit label and encryption label.
研究领域:
材料科学
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智能材料
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Shuai Yang,Yang He,Jinsong Leng
Multi-stimuli selective actuation of shape memory polymers (SMPs) with multi memory capabilities have attracted great attention in recent years, due to diverse active deformation application scenarios. Current multi-SMPs with low T t , however, are faced with inherent barriers, such as low fixation and inaccurate control, because the shape retainability, controllability, and responsiveness of SMPs are highly determined by transition temperature (T t ). Herein, quadruple-shape memory poly(aryl ether ketone) (PAEK) with tunable high T t and selective response characteristics were successfully fabricated for the first time, which especially harnessed ultra-high programmability and controllability. More significantly, the quadruple shape memory PAEK-based smart architectures such as “fingers” and “flower” were demonstrated to exhibit the controllable multi-stages actions. Utilizing a “man” as an example, we put forward different programming routes up to ten to make it perform complex pre-set deformation actions. The quadruple shape memory PAEK of high T t possessed great utilizing potential in fields of soft robots , actuators, and deformable devices.
研究领域:
材料科学
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智能材料
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Sun Yadong,Teng Jiachi,Kuang Yi,Yang Shengxiang,Yang Jiquan,Mao Hongli,Gu Zhongwei
Shape memory polymers (SMPs) have a wide range of potential applications in many fields. In particular, electrically driven SMPs have attracted increasing attention due to their unique electrical deformation behaviors. Carbon nanotubes (CNTs) are often used as SMP conductive fillers because of their excellent electrical conductivities. However, raw CNTs do not disperse into the polymer matrix well. This strictly limits their use. In this study, to improve their dispersion performance characteristics in the polymer matrix, hydroxylated multi-walled carbon nanotubes (MWCNT-OHs) were functionalized with octadecyl isocyanate (i-MWCNTs). Polyurethane with shape memory properties (SMPU) was synthesized using polycaprolactone diol (PCL-diol), hexamethylene diisocyanate (HDI), and 1,4-butanediol (BDO) at a 1:5:4 ratio. Then, electroactive shape memory composites were developed by blending SMPU with i-MWCNTs to produce SMPU/i-MWCNTs. The functionalized i-MWCNTs exhibited better dispersibility characteristics in organic solvents and SMPU composites than the MWCNT-OHs. The addition of i-MWCNTs reduced the crystallinity of SMPU without affecting the original chemical structure. In addition, the hydrogen bond index and melting temperature of the SMPU soft segment decreased significantly, and the thermal decomposition temperatures of the composites increased. The SMPU/i-MWCNT composites exhibited conductivity when the i-MWCNT content was 0.5 wt%. This conductivity increased with the i-MWCNT content. In addition, when the i-MWCNT content exceeded 1 wt%, the composite temperature could increase beyond 60°C within 140 s and the temporary structure could be restored to its initial state within 120 s using a voltage of 30 eV. Therefore, the functionalized CNTs exhibit excellent potential for use in the development of electroactive shape memory composites, which may be used in flexible electronics and other fields.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Smart Materials and Structures
·
2024
·Vol. 33
·期 8
·085042
·
IF 3.7
Shaojun Chen,Xianhao Mao,Zhen He,Wei Lu,Bing Wu,Haitao Zhuo
Four-dimensional (4D)-printing technology is attractive to researchers since it combines 3D printing with smart materials to produce 3D structures with various shapes and change shapes under specific external stimuli. Herein, novel shape memory polymer (SMP) pellets with infrared-light responsive shape memory effect were developed for 4D printing applications. The structures, properties, and infrared-light responsive shape memory performances of the resulting (SMP) pellets were thoroughly investigated. The results showed PDA/SMP pellets prepared by direct loading of polydopamine (PDA) particles on SMP pellets displayed less influence on the basic properties of SMP while fluidity was enhanced. The obtained PDA/SMP pellets employed as feed materials for particle 3D printers revealed good thermal-induced shape memory performance and photo-responsive shape memory performance in printed 3D structures. Under infrared-light irradiation, the curled shape recovered to straight splines within 60 s due to the strong absorption and good photo-thermal conversion of the loaded PDA nanoparticles under infrared light. Overall, the as-prepared PDA/SMP pellets look promising for use in biomedical fields and smart devices, as well as remote control deformation with 4D printing technology.
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
Polymers
·
2019
·Vol. 11
·期 10
·1599
·
IF 3.164
Xiaoming Qi,Wentong Yang,Laiming Yu,Wenjun Wang,Haohao Lu,Yanglong Wu,Shanwen Zhu,Yaofeng Zhu,Xiangdong Liu,Yubing Dong,Yaqin Fu
One-dimensional shape memory polymer fibers (SMPFs) have obvious advantages in mechanical properties, dispersion properties, and weavability. In this work, a method for fabricating semi-crystallization ethylene-vinyl acetate copolymer (EVA) fiber with two-way shape memory effect by melt spinning and ultraviolet (UV) curing was developed. Here, the effect of crosslink density on its performance was systematically analyzed by gel fraction measurement, tensile tests, DSC, and TMA analysis. The results showed that the crosslink density and shape memory properties of EVA fiber could be facilely adjusted by controlling UV curing time. The resulting EVA fiber with cylindrical structure had a diameter of 261.86 ± 13.07 μm, and its mechanical strength and elongation at break were 64.46 MPa and 114.33%, respectively. The critical impact of the crosslink density and applied constant stress on the two-way shape memory effect were analyzed. Moreover, the single EVA fiber could lift more than 143 times its own weight and achieve 9% reversible actuation strain. The reversible actuation capability was significantly enhanced by a simple winding design of the single EVA fiber, which provided great potential applications in smart textiles, flexible actuators, and artificial muscles.Keywords:shape memory polymer fiber;two-way shape memory effect;melt spinning;UV curing
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Beibei Hao,Yongcheng Li,Xuan Xiao,Wei Dai,Heng Chen,Shaojun Chen
This paper reports a facile preparation of re-configurable shape memory polymer (SMP) with photo-polymerization method. A novel SMP was successfully prepared from the photo-curable resin synthesized with hexamethylenediacrylate and 1,6-Hexanedithiol. The photo-cured polymer forms semi-crystalline reversible phase and chemically cross-linked netpoints. They show good thermal-induced shape memory effect with about 92% shape fixity and about 99% shape recovery. Moreover, the photo-cured SMPs have excellent thermal-induced shape reconfiguration properties. A new permanent shape could be reconfigured easily by heat treatment at 130 °C. It is thus proposed that the photo-curable resin could be used as “printing ink” for SMP 4D printing applications.
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
危险品化学品经营许可证（带存储）