ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xin Ren,Hongjun Xu,Li Jin,Changbiao Chen,Xueting Lu,Shuaibo Han,Hui Wang,Yan Zhang,Fangli Sun
Bamboo, attributed to its short growth cycle and excellent mechanical properties, has become a popular alternative to wood and other building materials such as cement and steel. However, its susceptibility to cracking and molds hinders its broad application in architecture and furniture. In this study, the bioresin polyfurfuryl alcohol (PFA)-modified epoxy resin (EP)/polyetheramine (PEA) system was constructed and in situ cured inside bamboo. Results showed that the epoxy/PFA bioresin could fill in the vascular bundles and parenchyma cells of bamboo, in situ cured and combined with it via hydrogen bond to form a composite with good overall performance. Especially, the epoxy/PFA bioresin possessed good shape memory performance, which was able to counteract the dry shrinkage stress of bamboo. The three cycles of extreme heating–cooling tests and 6 h continuous drying test at 103 °C were conducted to verify the modification effect on crack resistance of bamboo. The PFA/EP/PEA-modified bamboo culms remained crack-free, while 75% of untreated ones cracked in heating–cooling tests. Besides, when all of the untreated bamboo culms cracked, only 33.3% of the PFA/EP/PEA-modified bamboo had cracks in the continuous drying test. Furthermore, the epoxy/PFA bioresin system in bamboo also improved the mold resistance. The bioresin composites comprising bamboo, epoxy, and PFA exhibit considerable potential for advancing the incorporation of bamboo into ecologically sustainable practices within the realms of construction and furniture applications. This advancement extends the lifespan of bamboo products as well as expands their application scope particularly in regions experiencing substantial fluctuations in outdoor humidity.
研究领域:
材料科学
·
生物质工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiang Wang,Xin Li,Mengxin Kan,Hui Gao,Shanshan Liu,Xingxiang Ji,Handong Mu,Zhuangzhuang Mao,Zhanhui Yuan
Shape memory polyimide (SMPI) has excellent thermal stability and chemical inertness, and was used in high-end applications, such as aerospace, microelectronics, etc. However, the unsatisfied strength and toughness is currently the key challenges of SMPI. Herein, lignin, a natural polymer, with abundant rigid benzene ring structures and reactive functional groups is used to enhance SMPI’s mechanical properties and shape memory performance. The formation of hydrogen bonds and π-π interactions between lignin and SMPI matrix resulted in the simultaneously enhancement of strength and toughness through in-situ polymerization. As a result, the tensile strength and strain of composite films is increased from 73.45 MPa and 5.2 % to 114.5 MPa and 90.2 % at lignin content of 4 wt%, which are remarkably increased by 156 % and 1734 %, respectively. The shape recovery triggering temperature decreases ∼ 7°C with the increase of lignin content. What’s more, the shape fixation rate ( R f : 99.8 %) and recovery rate ( R r : 100 %) of L/SMPI composite films was also improved, and various complex shapes can be molded. The good thermal stability was well maintained, in which the decomposition temperature ( T d ) is ∼ 507 °C and the glass transition temperature ( T g ) is ∼ 181 °C. The excellent performance of lignin-modified shape memory polyimide (L/SMPI) opened a new ear for high value application of natural polymer, particularly in shape memory material.
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
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 45
·7444-7450
·
IF 4.776
Wu Wang,Hua Lai,Zhongjun Cheng,Hongjun Kang,Yongzhen Wang,Haiyang Zhang,Jingfeng Wang,Yuyan Liu
Water-induced shape memory polymers (SMPs) show promising applications in biomedicine, biosensing, anti-counterfeiting and intelligent actuating systems. However, the dual function of shape morphing and color switching has not been achieved in the water-induced SMP system. Herein, a novel water-induced SMP with both color-switching fluorescence behavior and shape memory performance is reported. The material is fabricated by crosslinking poly(vinyl alcohol) (PVA) and pH-responsive fluorescent carbon quantum dots (CQDs). The incorporation of CQDs with PVA not only improves the shape recovery performance but also endows the material with color-switching features. To our best knowledge, such smart ability is first realized in this PVA/CQD SMP system, and this report provides a novel strategy for fabricating smart water-induced SMPs with adjustable shape recovery performance and fluorescence.
研究领域:
材料科学
·
智能材料
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yue Zhou,Zhangyi Chi,Xiaoming Qi,Wenjun Wang,Laiming Yu,Yubing Dong,Chen Qian,Yaqin Fu
With the increasingly serious plastic pollution, people's demand for the multi-functional biodegradable plastics is becoming more and more urgent. Inspired by the crosslinked shape memory polymers, the crosslinked starch films were synthesized by inducing the decomposition of benzophenone into free radical and depriving hydrogen on starch macromolecules under UV irradiation, in order to gain a high shape memory performance. The results showed that a three-dimensional crosslinking network between starch macromolecule chains was formed. Compared with the uncrosslinked starch films, the photo-crosslinked films not only had higher mechanical property (tensile strength increased by 154%), but also had better water resistance (water contact angle from 60° to 87°) due to the reduction of free hydroxyl groups. In addition, the stable covalent bonds serving as netpoints endow photo-crosslinked films with great improvement in shape memory property, with nearly 180° bending recovery. More importantly, the maximum shape memory fixity ratio ( R f ) and shape memory recovery ratio ( R r ) under stretch deformation were 96.5% and 99.8%, respectively. And the R f and R r could reach 94.6% and 79.8% even at higher strain. In all, the excellent shape memory performance and good degradability crosslinked starch films, which have great potential application in disposable heat-shrinkable packaging materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yongdie Deng,Fenghua Zhang,Yanju Liu,Jinsong Leng
Phenol-formaldehyde (PF) resins with low flammability and excellent ablative property have been widely used in thermal protection systems in the aerospace field. The developing deployable thermal protection structure has prompted further exploration of the possibility of PF resin as a smart polymer. This paper prepares the shape memory phenol-formaldehyde resins (SMPFs) by introducing polyurethane (PU) prepolymer into the resol resin. The SMPFs with crystallization microregion possess excellent shape memory performance and better toughness than PF resin. In addition, the SMPFs have a higher carbon residue rate and better thermal stability compared with other shape memory polymers commonly used in the aerospace field. Multiple test results before and after γ-ray irradiation indicate that SMPFs have excellent irradiation resistance. The oxyacetylene ablative test demonstrates that SMPFs have relatively good ablative resistance. SMPFs inspire the production of intelligent thermal protection systems.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yahao Liu,Yuansheng Wang,Xue Yang,Wei Huang,Yu Zhang,Xiao Zhang,Xuan Wang
Stiffness variable polymers are an essential family of materials that have aroused considerable attention in soft actuators. Although lots of strategies have been proposed to achieve variable stiffness, it remains a formidable challenge to achieve a polymer with a wide stiffness range and fast stiffness change. Herein, a series of variable stiffness polymers with a fast stiffness change and wide stiffness range were successfully synthesized, and the formulas were optimized via Pearson correlation tests. The rigid/soft stiffness ratio of the designed polymer samples can reach up to 1376-folds. Impressively, owing to the phase-changing side chains, the narrow endothermic peak can be observed with full width at half-maximum within 5 °C. Moreover, the shape memory properties of the shape fixity (Rf) and shape recovery ratio (Rr) values of the shape memory properties could reach up to 99.3 and 99.2%, respectively. Then, the obtained polymer was introduced into a kind of designed 3D printing soft actuator. The soft actuator can achieve sharp heating–cooling cycle of 19 s under a 1.2 A current with 4 °C water as coolant and can lift a 200 g weight at the actuating state. Moreover, the stiffness of the soft actuator can reach up to 718 mN/mm. The soft actuator exhibits an outstanding actuate behavior and stiffness switchable capability. We expect our design strategy and obtained variable stiffness polymers to be potentially applied in soft actuators and other devices.
研究领域:
材料科学
·
软体机器人学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2016
·Vol. 25
·期 11
·957-965
·
IF 1.684
Li Tingting,Liu Xiaoqing,Jiang Yanhua,Ma Songqi,Zhu Jin
A bio-based shape memory epoxy resin (DGEAPA) was synthesized from rosin to achieve the sustainability of shape memory epoxy resin, and its chemical structure was determined by FTIR and 1 H NMR. For comparison, a petroleum-based epoxy, diglycidyl ester of terephthalic acid (DGT) having one benzene ring, was also synthesized. The properties, including thermal and mechanical properties, as well as shape memory properties of the epoxy resins cured with poly(propylene glycol)-bis (2-aminopropyl ether) (D230), were studied by differential scanning calorimeter, dynamic mechanical analysis, thermogravimetric analysis, tensile test, and U-type shape memory test. The effect of the stoichiometric ratio n DGEAPA /n DGT on the properties was studied as well. The thermal and mechanical properties, including thermal stability, glass transition temperature, tensile strength, and modulus of the cured epoxy systems, were found to be increased with DGEAPA incremental content, and the cured neat rosin-based epoxy system exhibited the highest properties. Both the cured rosin-based epoxy and the cured DGEAPA showed significant shape memory performance. Meanwhile, the rosin ring structure made the cured rosin-based epoxy systems display excellent shape recovery fixity, while small lower shape recovery and shape recovery rate relative to the cured neat DGT system. Therefore, the rosin-based epoxy resin has a great potential in the shape memory material applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Jie Xu,Huaming Wang,Tao Zhang,Lei Li,Sixun Zheng
In this contribution, we reported a novel strategy to crosslink polyurethane (PU) via host-guest inclusion complexations. First, a linear PU with adamantane (Ad) as side groups was synthesized with a 1,3-diol bearing adamantane as the chain extender . Thereafter, this linear PU was crosslinked with a poly( β -cyclodextrin) through host-guest inclusion complexations to afford PU-Ad-CD networks. In comparison with the linear PU, the PU-Ad-CD networks exhibited improved mechanical properties with the Young's modulus of 43.21 MPa, which was more than eight times as that of the linear PU. The formation of inclusion complexes enabled the PU-Ad-CD networks to display reprocessing properties. In addition, the shape memory properties of the networks featured the reconfigurability of original shape with the aid of the exchange of the host-guest inclusion complexations. This study provides new insights into the development of high-performance PU materials.
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
POLYMER
·
2025
·
IF 4.5
Xiang Li,Xilong Chen,Zicheng Shan,Guangtao Qian,Chuyang Luo,Hui Zhang,Liying Zhang,Jianyong Yu
Achieving high thermal conductivity of shape memory polyimides without compromising their shape memory performance and mechanical properties is challenging. To solve this issue, a molecular structure design strategy was employed to synthesize a range of sequence-controlled block copolyimides through the introduction of soft segments into rigid segments, thereby regulating molecular chain mobility. An intrinsically thermally conductive shape memory block copolyimides with rapid shape recovery speed, exceptional shape memory and mechanical properties were achieved. Through regulating the proportion of soft segments, strong physical cross-linking structures, including π-π stacking interactions and molecular chain entanglements, were generated, ultimately achieving shape fixity and recovery ratios of 97.4 % and 99.6 %, respectively. Owing to their relatively ordered molecular structures, which contributed to high intrinsic thermal conductivity, the developed copolyimides displayed a rapid shape recovery speed of 3.5 s at a trigger temperature of 275 °C. The molecular structure design strategies employed might offer deep insight into the exploration of shape memory polyimides.
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
·
2025
·
IF 4.7
Jianglu Teng,Xibin Shen,Guohua Hang,Yuan Gao,Jiawei Hu,Sixun Zheng
The reaction of 4-(hydroxymethyl)phenylboronic acid with triethanolamine was carried out to synthesize a boronic ester diol featuring boron–nitrogen (B–N) coordination. This diol served as a chain extender, allowing B–N-coordinated boronic ester bonds to be introduced into polyurethane (PU) networks. Toward this end, we first synthesized a series of α,ω-dihydroxyl polyurethane telechelics with α,ω-dihydroxypropyl poly(dimethylsiloxane) as the polymeric diol. By varying the molar ratio of the boronic ester diol to 1,4-butane diol, the α,ω-dihydroxyl polyurethane telechelics were synthesized with variable contents of the dynamic covalent bonds. Thereafter, the reaction of α,ω-dihydroxyl PU telechelics with 3-isocyanatopropyl triethoxysilane was carried out to gain α,ω-ditriethoxysiloxane PU telechelics. The latter were readily cross-linked via the sol–gel process to afford the mechanically robust PU networks, with Young’s modulus and tensile strength as high as 302.7 and 35.4 MPa, respectively. More importantly, the reprocessing properties were imparted to the PU networks. Compared to the control PU network, the reprocessing temperature was depressed to 120 °C. In the meantime, the shape memory properties of PU networks were significantly improved through the introduction of dynamic covalent bonds. Furthermore, the shape memory networks featured reconfigurability with the introduction of B–N-coordinated boronic ester bonds.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·772-779
·
IF 3.288
Kuo Liu,Qingyuan Peng,Ziwei Li,Jingzhen Cheng,Li Lao,Xing Li,Zuocai Zhang,Shaorong Lu,Yuqi Li
Developing polylactic acid (PLA) shape-memory films with excellent mechanical and thermal properties is essential for applying PLA in the shape-memory materials field. In this study, a series of perylene-bisimide-functionalized graphene nanosheet (PBI–GN)/PLA shape-memory films were successfully prepared by electrospinning. The effects of PBI–GNs on the mechanical, thermal, and shape-memory properties of the PLA nanofiber films were systematically studied. Results showed that with a 9 wt% content of PBI–GNs, the thermal stability of the composite film significantly improved, and the tensile strength and elongation at break increased by 346% and 11.1%, respectively, compared with those of the neat PLA nanofiber film. Moreover, at this percentage of PBI–GNs, the composite film exhibited the maximum shape recovery of 92.3%, which was 36.3% higher than that of the neat film. After five thermomechanical test cycles, the ratio decreased by only 3.7%.
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
LANGMUIR
·
2021
·
IF 3.882
Ya Liu,Li Wang,Hongsheng Lu,Zhiyu Huang
Hydrogels and organogels, as two crucial representatives of soft materials, have attracted immense interest. However, they develop independently along two parallel lines, and these gels with single networks have their inherent drawbacks. For example, hydrogels tend to freeze, and organogels are usually brittle. Herein, organogels were incorporated into a hydrogel matrix for the synthesis of organohydrogels GOHs through polymerization in Pickering emulsion. The rigid organogel domains contribute to enhancing the strength of organohydrogels. Besides this, the organogels derived from 12-HAS self-assembly behavior exhibit a gel–sol transition when the temperature reaches 70 °C, thus leading to a thermo-softening behavior in the GOHs. Due to the phase transition of organogel domains and the elastic hydrogel network, the resultant organohydrogels demonstrate high-strain shape-memory performance (over 1000%) which could help achieve full recovery in seconds. Consequently, GOHs are endowed with the potential of practical application in soft robots, wearable devices, and biological materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）