MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 218
·期 20
·1700265
·
IF 2.5
Peiyao Yan,Wei Zhao,Yanjun Wang,Yuanyuan Jiang,Changlin Zhou,Jingxin Lei
Welding technology of polymer materials, serving as an exceedingly good tactics to save materials, reduce cost, and reduce material loss, is only extensively applied in thermoplastic materials for the moment. Recently, a new class of polymer, known as vitrimer, has attracted the eye of researchers because it realizes the reprocessing and reshape of thermosets and possesses many excellent functions, such as multishape memory, healing, and surface welding. Among these, the vitrimer makes the surface welding of thermosetting material possible. In this paper, carbon nanotubes-polyurethane vitrimer nanocomposites with the capability of surface welding controlled by heat and near-infrared (NIR) light are successfully prepared. Here, the effects of surface welding are characterized by lap shear tests and optical microscope. In addition, from the control experiments, it is found that the shear strength of the light-welding sample under NIR illumination for 1 min is greater than that of the heat-welding sample at 110 °C for 10 min. Furthermore, thermosetting polyurethane has been applied in many fields, and it is hoped that the findings, especially near-infrared welding technology, will make some contributions for welding technology of polymer.
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
·
2024
·
IF 13.3
Jianming Liao,Yansu Hou,Xi Zhang,Jun Li,Min Zhang,Yunyuan Dong,Qifu Zheng,Xiaobin Chen
Traditional plastic foam, typically derived from fossil fuel-based polymers that are resistant to natural degradation, faces environmental challenges. As an alternative, cellulose, a biodegradable polymer, shows promise in the production of eco-friendly foam. Nonetheless, its reliance on hydrogen bonding between fibers poses limitations for practical applications. Here, drawing inspiration from bird nest structures, a straightforward and scalable method (co-assembly and thermal welding) has been developed for creating cellulose-PLA biofoam. The resulting biofoam displays advantageous properties such as low density (12.9 ∼ 27.1 kg/m 3 ), high compression strength (modulus of 12.1 MPa·cm 3 ·g −1 ), good thermal stability, and water stability (maintaining structural integrity in water). Moreover, it exhibits exceptional degradation rates (significant degradation within 40 days) and recyclability. Thus, this biofoam holds promise as a sustainable alternative to standard plastic foams, mitigating “white pollution.”
研究领域:
材料科学
·
环境科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2021
·Vol. 41
·期 5
·365-374
·
IF 1.367
Weiqiang Lian,Huipeng Han,Xiaoxin Zhang,Guirong Peng,Zhaojing Jia,Zhenlin Zhang
Anhydride cured epoxy vitrimers usually exhibit desired mechanical strength but poor toughness and slow transesterification rate. Therefore, the repairing property of the material was restricted. In this paper, polyurethane modified epoxy vitrimer (PU-Epv) was prepared. PU was introduced into the vitrimer system of tetrahydrophthalic anhydride cured epoxy to improve the toughness of the material. Meanwhile, because of the presence of amino ester, the transesterification reaction was promoted and the activation energy of the transesterification was only 33.59 kJ/mol. In the thermal welding experiment, the material could be welded at least five times, and scratches on the surface of the samples could be efficiently repaired within 30 min. The toughness of the material was improved without damaging the strength. Meanwhile, the hard thermosetting epoxy was endowed with excellent repairing properties to increase the service life of the material.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Jinbang Han,Xiuzhong Zhu,Li Tian,Naishuo Yan,Jinjie Zang,Haitao Zhang,Lei Wang,Fengshan Zhang
Exploiting inexpensive, bio-derived lignin as a partial replacement for petroleum-based polyols offers a sustainable pathway to high-value lignin applications. However, prior studies have mainly focused on lignin's reinforcing effects in elastomers, neglecting its potential photothermal properties. Lignin-modified waterborne polyurethane elastomers (LWPUxAy) were synthesized, demonstrating UV resistance, enhanced mechanical robustness, rapid light-controlled self-healing, and photothermal weldability. LWPUxAy exhibited exceptional mechanical properties (51.9 MPa tensile strength, 768.8 % elongation) and a significantly enhanced photothermal conversion efficiency due to Ag + ligand bonding. Upon near-infrared (NIR) irradiation (1.25 W/cm 2 ), LWPUxAy rapidly reached a surface temperature exceeding 160 °C within 35 s. The synthesized LWPUxAy demonstrated rapid, light-controlled self-healing and notable welding performance under near-infrared (NIR) irradiation (0.6 W/cm 2 , 5 min). Furthermore, LWPUx effectively blocked the entire UV spectrum within the 200–400 nm range. Bio-derived lignin was incorporated into light-responsive polyurethane elastomers, resulting in enhanced tensile strength and self-healing efficiency.
研究领域:
高分子科学
·
材料工程
·
自修复材料
·
光热转换
·
可持续化学
·
弹性体
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qi Yang,Pengfei Ren,Guangming Cai
The demand for high energy density and safety has significantly promoted the development of all-solid-state lithium metal batteries. However, their practical use has been limited by the solid-solid interface and thermodynamic stability between lithium metal and solid electrolytes (SEs). Here, we constructed a hybrid interface via a thermal welding strategy to achieve stable cycling. Specifically, a dense and robust AlF 3 interface layer was constructed on the surface of the lithium metal via pressing and heat treatment. The lithiation products Li-Al alloy and LiF can effectively improve the interface contact and inhibit the growth of lithium dendrites. As a result, the critical current density (CCD) of the Li/Li symmetric cell significantly improved from 0.8 to 3.3 mA cm −2 , and the cycling life was dramatically increased to 6000 h at a high current density of 0.4 mA cm −2 . Moreover, the hybrid interface enabled stable cycling of both Li/Li symmetric and LiNi 0.6 Mn 0.2 Co 0.2 O 2 /Li cells even at high current densities. The modified layer material had been diversified to SnF 2 , ZnF 2 , and MgF 2 , thus supporting the general concept of thermal activation strategy. Such a design can be extended to other solid-state devices for better functioning and extended cycle life.
研究领域:
材料科学
·
储能
·
电化学
·
全固态电池
·
界面工程
✓ 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）