Polymers
·
2019
·Vol. 11
·期 5
·803
·
IF 3.164
Feng Bao,Fengfeng Zhang,Chenghao Wang,Yuanyuan Song,Nan Li,Jinyan Wang,Xigao Jian
The application of poly(phthalazinone ether ketone)s (PPEKs) resin containing phthalazinone moiety is limited, due to its poor thermoforming processability. To investigate the effects of the phthalazinone’s side-group on the thermal stability and processability of the resin, a series of PPEKs resins with different side-group (–H/–CH3/–Ph) were prepared by nucleophilic aromatic substitution polymerization. The properties of the obtained resins were investigated by differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), dynamic thermomechanical analysis (DMA), and rheogoniometer. The results show that the introduction of methyl or phenyl into the PPEKs resin, significantly reduced the melting viscosity of the resin, but resulted in a slight decrease in the thermal stability of it. This might be due to the presence of methyl or phenyl, which enhanced the free volume of the molecule and reduced the entanglement between the chains; the results of the computer simulation confirmed it. Moreover, the resin films displayed excellent tensile strength with the introduction of methyl or phenyl. In a word, a novel poly(phthalazinone ether ketone)s resin with thermal resistance, easy processing and excellent mechanical properties could be obtained by introducing appropriate bulk-rigid side-groups into the phthalazinone moiety.Keywords:phthalazinone;side-group;thermal properties;processability
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Tao Wang,Jiajia Ye,Shuning Liu,Xiaobo Liu,Lifen Tong
Melamine-based benzoxazine resins overcome the disadvantages of conventional polybenzoxazine, such as high brittleness and difficult processing. However, the reactivity is too high to be easily processed. In this work, phenolphthalein-type melamine-based benzoxazine (PTma-BG) was synthesized from paraformaldehyde, phenolphthalein, melamine, and benzeneguanoamine. The chemical structure of PTma-BGs was characterized by fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance ( 1 H NMR), and the curing behavior and properties of the resulting polymers were verified. The results demonstrate that the incorporation of benzeneguanoamine facilitates the formation of the oxazine ring while simultaneously reducing the reactivity of the PTma-BGs precursor, prolonging the gelation time, and expanding the processing window. Poly(PTma-40BG) has good thermal stability; it has been observed that the T d5 of Poly(PTma-40ma) reaches 328°C, which is higher than that of Poly(PTma). Furthermore, Poly(PTma-BG)s demonstrate exceptional heat resistance, with a glass transition temperature exceeding 285°C. The introduction of benzeneguanoamine results in a reduction in the number of polar groups, which in turn leads to a decrease in both water absorption and dielectric constant.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yuzhu Chen,Chao Zheng
Thermosensitive polymer solutions and hydrogels show great potential for thermochromic windows. However, current research often overlooks two critical factors: thermal stability under heating and processability, which are typically contradictory. This study develops a physically cross-linked hydrogel specifically for thermochromic smart windows, aiming to achieve an optimal balance between these two factors. The hydrogel is made from low-cost, environmentally friendly materials, using commercial block polyether (L62) combined with a poly(vinyl alcohol)-borosilicate network. By optimizing PVA and borax concentrations at 2 and 0.3%, the hydrogel demonstrates good thermal stability, showing no significant changes after repeated heating to 60 °C for 9 h. Additionally, it exhibits excellent processability, allowing it to flow and fill gaps between glass slides when heated. The transition temperature for transmittance and solar modulation can be easily adjusted by varying the concentration of L62. The resulting hydrogel achieves tunable transition temperature, high luminous transmittance (71.2%), solar modulation efficiency (72.2%), and excellent durability. Compared to air-sandwiched windows, these thermochromic smart windows exhibit a significant cooling effect, with temperature responsiveness contributing up to 50%, depending on hydrogel thickness. This work addresses key issues that will advance the industrial application of hydrogel-derived thermochromic smart windows.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Ning-Bo Li,Meng Wang,Ling-Xiang Guo,Bao-Ping Lin,Hong Yang
New generation spacecraft technology requires more and more deployable, light-weight, thin polymer films , in particular novel polyimide materials with high optical transparency, excellent foldability and superior flexibility. In this work, we develop a highly transparent, ultra-foldable, ultra-flexible and ultra-processable polyimide composite material by incorporating 5–8 wt% of ionic liquid 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide into colorless polyimide matrices. This 23-μm-thick polyimide composite film exhibits a high optical transmittance of 90.4% even at 450 nm wavelength and an incredibly low cutoff wavelength of 273 nm. It is an extremely strong and flexible material, with a tensile modulus of 844.6 MPa, a tensile strength of 48.2 MPa, a high elongation at break of 108.4%, and an extraordinary minimum bend radius of 1 μ m. It can be easily folded in half 4 times or twisted by 900° without any crack damages. Moreover, it has a low expense cost and good film processability for industrialization manufacturing. All of these superior performances render this ionic liquid/polyimide composite an ideal structural material for solar sails, solar arrays and thin-film photovoltaics , etc.
研究领域:
材料科学
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航天工程
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高分子化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 3
·1351-1360
·
IF 14.511
Deqi Wang,Jie Liu,Tianyu Tan,Shishuo Liu,Guozhen Xu,Zhimiao Zhang,Yang Qin,Fengsheng Li
Boron (B) is the most suitable fuel for rocket ramjet. However, boron oxide (B2O3) on the surface of B causes many problems in its application. B2O3 cross-links with hydroxyl prepolymer, which reduces the processibility of the system. Moreover, B2O3 hinders contact between the oxidation component and internal active B. Consequently, B is difficult to ignite, and its reactivity and combustion efficiency are limited. To solve these problems, a dual-core–shell structure, B@LiF@AP, B embedded with LiF as core and AP as shell, has been designed and prepared. Its multi-effect synergies, improving processibility, protecting B from oxidation by AP before burning, decomposing B2O3, and improving reactivity and combustion efficiency, have been confirmed. Compared with the mixed sample of B and AP (B–AP), the heat release of B@LiF@AP increased by 211.10%. The combustion efficiency of B@LiF@AP increased by 42.60% more than that of B@AP. The ignition test showed that its ignition energy was reduced by 37.89% and the flame temperature increased by 26.27% than that of B–AP. The application and development of boron-based rocket ramjet will be accelerated because the application problems of B are solved by B@LiF@AP.
研究领域:
材料科学
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航空航天工程
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DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 12
·
IF 12.5
Zekai Wu,Chengzhen Chu,Yuhui Jin,Lei Yang,Bo Qian,Yuepeng Wang,Yihan Wang,Jiani Wu,Yujie Jia,Wenwen Zhang,Zhengwei You
There is usually a trade-off between high-tensile properties and processability in polymers because the mechanisms of these properties are mutually exclusive. Here, we design a chemically coupled four-arm dynamic polymer cross-link site to overcome this challenge. By concurrently increasing cross-link sites and dynamic bond contents, this approach fabricates polymer networks with high cross-link density yet low processing temperature, challenging the conventional structure-property relationship where cross-linking inherently limits plasticity. Notably, the material demonstrates remarkable processability, evidenced by the ratio of G′max to G′min with a temperature differential (ΔT) of 120°C (which signifies the soft-to-hard transition capability). This ratio reaches 153.3, higher than all reported cross-linked polyurethanes. This work represents a molecular strategy that combines electronic effect and topology network design to modulate materials’ properties, and it will be useful for developing next-generation materials.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2020
·
IF 10.443
Juan Li,Shuai Zhang,Fei Jia,Shuqi Zheng,Xiaolei Shi,Daqiang Jiang,Siyu Wang,Guiwu Lu,Liming Wu,Zhi-Gang Chen
Approaching practical thermoelectric devices require high-performance and machinable thermoelectric materials . However, the currently available materials are usually brittle. In this work, Nd-doped Mg 3 Sb 2 -based compounds exhibit not only excellent thermoelectric performance but also superior machinability . Mg 3.2 Nd 0.03 Sb 1.5 Bi 0.5 exhibits a high power factor of 20.6 μW cm −1 K −2 at 725 K and a peak zT of 1.8, which mainly originates from the increased n of ~8 × 10 19 cm −3 by Nd/Mg substitutional defects. Defect calculations predict that other rare earth elements (Sm, Gd, Tb, Dy and Ho) have the same effect as Nd on Mg 3 Sb 2 and the predicted highest achievable electron concentrations at 700 K are ~10 20 cm −3 . The measured hardness, Young's modulus and fracture toughness of Mg 3.2 Nd 0.03 Sb 1.5 Bi 0.5 are 1.1 GPa, 49.8 GPa and 1.4 MPa m 1/2 , respectively. In addition, the sample can be easily machined into the dog-bone shape with external thread at both ends, indicating the excellent machinability of Mg 3 Sb 2 -based materials. This work suggests a bright future of Mg 3 Sb 2 -based thermoelectric materials for practical applications and device fabrication .
研究领域:
材料科学
·
热电材料研究
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DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 28
·4144-4153
·
IF 5.364
Lin Wang,Yingjun Liu,Yunhe Qiao,Yuli Wang,Ziwen Cui,Shaoyi Zhu,Fuwei Dong,Sikun Fang,Aihua Du
It is very challenging to prepare elastomer vitrimers that are both robust and dimensionally stable in service. To address this issue, we have initiated a multi-phase design of elastomer vitrimers by incorporating quadruple hydrogen bonds (H-bonds) into vitrimer networks. Specifically, commercialized styrene–butadiene rubber (SBR) was functionalized with the synthesized 5-benzyl-3,6-dioxo-2-piperazineacetic acid (DKP) to introduce amide functionalities, which was then crosslinked by dimercapto-borate via thiol–ene “click” chemistry. The H-bonds between amide moieties functioned as sacrificial units, which could undergo reversible breakage and recombination events, and therefore improve the modulus, ultimate strength, and toughness simultaneously. Moreover, with an aromatic ring and a symmetrical amide group in the structure, the grafted DKP could self-assemble via hydrogen bonds, leading to the formation of a microphase-separated structure in the elastomer matrix. Besides, the creep resistance was improved as the H-bonds were physical crosslinks that imposed additional constraints on chain segment diffusion. Nevertheless, the reprocessability of the network was not affected as the H-bonds and boronic ester crosslinks could dissociate and exchange at elevated temperatures, respectively.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wentao Wang,Yutong Xia,Mang Wu,Min Wu,Jianbing Chen
Nonconjugated fluorescent polymers devoid of large π–π conjugated structures have received considerable attention due to their significant academic importance and broad application potentials in various fields. Herein, we report an effective strategy to fabricate multifunctional fluorescent amylopectin derivatives and reveal their unique aspects of aggregation-induced emission (AIE), cryogenic long-persistent phosphorescence (~6 s) and excellent processabilities characteristics, which are extremely different from traditional luminogens. These amylopectin- graft -poly( n -butyl acrylate- co -1-vinylimidazole) copolymers (Amylopectin-BVs) prepared by the grafting-from method employing RAFT and experienced subsequently with metal-ligand cross-linking. Specifically, clustering-triggered fluorescent emission or cryogenic long-persistent phosphorescence of amylopectin could be achieved by the aggregation of oxygen and nitrogen atoms along with conformation rigidification, which shows great promise in optoelectronic and biological applications.
研究领域:
材料科学
·
光学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2016
·
IF 5.554
Si Yu Zheng,Hongyao Ding,Jin Qian,Jun Yin,Zi Liang Wu,Yihu Song,Qiang Zheng
It is challenging to develop hydrogels with a combination of excellent mechanical properties, versatile functions, and good processability. Here we report a physical hydrogel of poly(acrylamide-co-acrylic acid) (P(AAm-co-AAc)) cross-linked by carboxyl–Fe3+ coordination complexes that possesses high stiffness and toughness, fatigue resistance, and stimulation-triggered healing along with shape memory and processing abilities. The copolymers have randomly dispersed AAm and AAc repeat units, making the physical cross-links with different strength. The strong coordination bonds and their associations serve as permanent cross-links, imparting the elasticity, whereas the weak ones reversibly rupture and re-form, dissipating the energy. Furthermore, a stick–slip instability is observed during the tearing test, which should be associated with the specific nature of metal-coordination bonds that are strong yet fragile. Because of the dynamic nature of coordination bonds, both tensile and tearing mechanical properties are rate dependent. By tuning the bond strength via pH, the gels show distinct mechanical properties, shape memory ability, and even reversible sol–gel transition. The system also shows good processability; the copolymer solutions can be processed into tough gels with different structures by three-dimensional printing technology. These versatile, tough, yet processable hydrogels should be a promising material as structural elements in various applications.
研究领域:
材料科学
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化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2025
·
IF 5.5
Ruiduan Ji,Xiaoyu Liu,Haizhou Pei,Wei-Hui Fang,Weiguo Huang,Jian Zhang
Comprehensive Summary This study highlights the innovative use of increased rare earth elements to enhance the dielectric properties of materials and devices. The AlOC-129Ln series, features the highest number of rare earth dopants in aluminum oxo clusters to date. The trivalent ions in AlOC-129Ln impart a high dipole moment, significantly elevating the dielectric constant ( k ) of the doped polymer films. AlOC-129Ce, in particular, exhibits the largest molecular size, which enhances interfacial effects and achieves a relative dielectric constant four times greater than that of undoped polymers and 1.5 times higher than those with single rare earth dopants. The substantial molecular size (~2.5 nm) and robust charge scattering and trapping capabilities of AlOC-129Ln reduce dielectric loss by up to 50% at high frequencies. Additionally, its excellent solution processability enhances breakdown strength by 147%, ensuring superior electrical stability. This research demonstrates the versatility of the cluster doping strategy in effectively balancing dielectric constant and loss, unveiling the promising potential of solution-processable cluster materials in electronic devices.
研究领域:
材料科学
·
电子工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Wanglin Zhang,Xuanhao Wu,Xiaoyan Peng,Li Zhu,Hongkang Wang,Hui Liu,Hongye Yuan
The advancement of wireless gas sensing signifies a substantial leap forward in gas detection and intelligent monitoring technologies. This necessitates stringent design criteria for gas sensitive materials with good solution processability, conductivity, and porosity, whose design and synthesis remain challenging yet highly sought-after. Herein, the fabrication of NUS-8/polyaniline (PANI) nanosheets is presented with excellent solution processability, high porosity, triboelectric property, and superior electrical conductivity via a template-directed polymerization strategy. Solution processable NUS-8 nanosheets, synthesized directly by a “one-pot” approach, serve as templates to enhance the “on-site” polymerization of aniline, resulting in the formation of PANI layer on NUS-8 nanosheets with a thickness of 7 nm. The resultant NUS-8/PANI nanosheets exhibit outstanding solution processability, and a film conductivity of 8.6 S m −1 . The solution processability enables the facile fabrication of homogeneous and compact NUS-8/PANI films and thus their integration onto electronic devices targeted for multifunctional sensing. The NUS-8/PANI coated sensors demonstrate sensitive and selective detection at room temperature toward ultratrace ammonia with a detection limit of 120 ppb. A wireless sensing system based on the NUS-8/PANI-coated sensor is capable to monitor the spoilage process of meat. This study paves novel avenues for designing and synthesizing gas-sensitive materials for practical applications.
研究领域:
材料科学
·
传感器技术
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化学工程
✓ 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）