POLYMER
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2026
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IF 5.1
Chenglong Wang,Jianhua Han,Lishuai Zong,Xigao Jian,Jinyan Wang
Polyamide 66 (PA66) is a widely used engineering plastic, which is applied in diverse fields due to its high mechanical strength, excellent wear resistance, and outstanding chemical stability. However, in fused filament fabrication (FFF) 3D printing, PA66 suffers from two critical challenges that restrict its printability and applications: low melt viscosity leads to reduced printing precision and difficulties in filament fabrication, while significant crystalline shrinkage during cooling causes warpage. Herein, an amorphous poly(arylene ether nitrile ketone) resin (PPHENKK) with a glass transition temperature of 225 °C (below the melting point of PA66) and a high melt viscosity is synthesized, and polyethyleneimine (PEI) is subsequently incorporated as a compatibilizer. The crystallinity of the PA66/PPHENKK/PEI blend decreased by 27%, and the coefficient of thermal expansion was reduced by 20%, enabling the successful preparation of filaments suitable for FFF 3D printing with high dimensional accuracy and negligible warpage. Furthermore, with the introduction of PPHENKK, the tensile strength reaches 62.6 MPa (an increase of 25.5%), while the elongation at break remains at a relatively high level of 13.1%. Meanwhile, the heat resistance was improved, with the glass transition temperature increased by 11 °C. Overall, the developed PPHENKK/PA66 blend exhibits a balanced combination of mechanical strength, thermal stability, and dimensional accuracy, making it an effective material for advanced FFF 3D printing applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
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2026
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IF 4
Zhenyang Qi,Jianxiang Lin,Shiqiang Yan,Kezhang Zhang,Wenhao Fan,Qiang Zhang,Shaoping Chen
Carbon fiber-reinforced polymer (CFRP) composites are increasingly employed in automotive, aerospace, and related industries to achieve lightweight structural designs. Although friction stir lap welding (FSLW) has been widely utilized for metal-thermoplastic composite joining, most existing studies have focused on static strength and fracture behavior, with limited attention to fatigue performance and dynamic damage evolution. In this work, high-aluminum-content particle-filled PA66 composites were manufactured using an electric-field-activated hot-press sintering process and subsequently joined to 6061-T6 via FSLW. The dissimilar joints consistently failed on the composite side under both static and cyclic loading, exhibiting a static tensile strength of 1935 N. As the composite material governed joint failure, fatigue characterization concentrated on the composite side. At 41.7% of the static strength, the composite achieved a fatigue life of 602,999 cycles. These results demonstrate that the proposed dissimilar FSLW joint possesses promising fatigue resistance, supporting its potential application in lightweight transportation structures. The results also provide a basis for future studies aimed at optimizing interfacial design and enhancing the long-term durability of metal-polymer hybrid joints.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xiedan Ren,Xuefei Chen,Shuheng Long,Houyong Yu,Xiaohua Yang
The development of highly efficient flame retardants (FRs) is crucial for enhancing the fire safety of polyamide 66 (PA66). This study synthesized a novel two-dimensional lamellar nitrogen‑phosphorus (N P) synergetic FR (C-MATP) through covalent grafting of melamine (MEL) and electrostatic adsorption of aminotrimethylenephosphoric acid (ATMP) onto cellulose nanocrystals (CNC) in an organic solvent-free environment, and applied it to prepare high-performance PA66 composites. The CNC, MEL, and ATMP synergy enabled C-MATP to generate robust intumescent char and release significant inert gases, achieving effective flame retardancy. Remarkably, the addition of C-MATP endowed the PA66 with superior flame retardancy, smoke suppression, and anti-dripping performance through the synergy of condensed and gas phases. The limiting oxygen index (LOI) and UL-94 rating of P/10C-MATP composite reached 28.1 % and V -0, respectively, along with 48.3 % and 38.8 % reductions in the total heat release (THR) and total smoke production (TSP) compared with pure PA66. Moreover, the lamellar structure of C-MATP endowed the PA66 composite with excellent thermal insulation and mechanical properties, resulting in a 100 % increase in tensile strength and a 26 % increase in elongation at break compared to pure PA66. This study presents an innovative strategy for fabricating high-performance, multifunctional PA66 materials using novel, eco-friendly, and efficient FRs.
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产品关联
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Li Zeng,Yuan Li,Qichao Li,Yiping Guo
Polyvinylidene fluoride (PVDF) has attracted extensive attention for flexible piezoelectric strain sensors due to its piezoelectric activity and mechanical robustness. However, practical application in small-strain monitoring occasions remains restricted by limitations such as low intrinsic piezoelectricity. Inspired by the mechanical structure of Venus flytrap's trigger hairs, this study synergistically combines modulus differentiation mechanisms with a coaxial architecture to develop core–shell nanofibers. The fiber structure comprises a rigid Polyamide 66 (PA66) core, a flexible PVDF sensing layer as the outer shell, and polydopamine-modified BaTiO3 nanoparticles (PBTO) distributed within the outer sheath. These bioinspired fibers feature a radial stiffness-flexibility combination to achieve directional stress transmission. The modified nanofiber membrane achieves an 840% enhancement in voltage output compared to pure PVDF, demonstrating bending sensitivity of Gauge Factor (GF) 221.4 and only 0.67% signal attenuation over 12 000 cyclic tests. Leveraging this amplification mechanism, the core–shell nanofibers have been engineered into bending vector sensors capable of discerning wind velocity magnitude and directional parameters. This approach shows potential for optimizing unmanned aerial vehicle flight trajectories to enhance operational efficiency.
研究领域:
材料科学
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纳米技术
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传感器
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生物力学
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柔性电子
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产品关联
DOI
PubMed
高影响因子
Nano Energy
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2021
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IF 17.881
Na Sun,Gui-Gen Wang,Hai-Xu Zhao,Ya-Wei Cai,Jia-Ze Li,Gui-Zhong Li,Xiao-Nan Zhang,Bao-Lin Wang,Jie-Cai Han,Yuanhao Wang,Ya Yang
Flexible, breathable and widely implementable triboelectric nanogenerator is highly demanded for wearable electronics to satisfy the technical requirements of the Internet of Things (IoT). The fabric-based wearable electronic devices have conspicuous advantages, however, how to optimize their electrical performance and comfortable characteristics is a great challenge. Here, we reported a waterproof, breathable and wearable electronics by fabricating nanofiber-based triboelectric nanogenerator (NF-TENG). The NF-TENG was consisted of the electrospun PA66/MWCNTs (multi-walled carbon nanotubes) nanofibers film with the nano-net structure used as the tribo-positive layer and the electrospun PVDF nanofibers film used as the tribo-negative layer, respectively. Owing to the coupling effect between the nano-network structure and porous structure , the effective contact area is enhanced effectively. A 20 mm × 20 mm NF-TENG demonstrates a peak voltage, current and a maximum power density up to 142 V, 15.5 μA and 1.30 W/m 2 , respectively. The NF-TENG can be worth spread application to resolve power source for some wearable electronics. Also, the as-obtained NF-TENG has high gas-permeability of 11.5 mm s −1 benefiting from the hierarchical networks, and thus exhibits good washable characteristics. These results indicate that the NF-TENG is promising for providing a new vision in the area of self-powered wearable technology .
研究领域:
材料科学
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纳米技术
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可穿戴技术
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电子学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Hua-Bin Yuan,Xue Lei,Jin Cheng,Tieling Xing,Guoqiang Chen
Polyphenols have been utilized to connect hydrophobic modifiers with certain substrates because of their adhesive properties and multiple active groups in their structure. Nevertheless, research is scarce regarding using polyphenols to enhance the superhydrophobic properties of polyamide . In this study, a plant-derived phenolic compound , p-coumaric acid (pCA), was chelated with Fe 3+ and deposited on the polyamide 66 (PA66) surface to increase its roughness. Subsequently, octadecanethiol was grafted onto pCA using a thiol-ene click chemistry reaction to create a superhydrophobic modified PA66 fabric (pCA-Fe-SH-PA66) with a static water contact angle (CA) of 154.4° and a sliding angle (SA) of 2°. The resulting pCA-Fe-SH-PA66 demonstrated excellent capabilities in self-cleaning, UV-blocking, photothermal conversion, and oil-water separation. Furthermore, pCA-Fe-SH-PA66 exhibited remarkable antibacterial ability, displaying inhibitory rates of 97.00% against E. coli and 96.15% against S. aureus , respectively. Additionally, it demonstrated noteworthy stability in a series of tests, encompassing 225 min of washing, 1000 cycles of abrasion, 48 h of UV light aging, 48 h of acid/base solution, seawater, and organic reagents immersion. Furthermore, it was demonstrated that three additional plant-derived phenolic compounds, namely 3-hydroxycinnamic acid (HA), polyatin (PD), and 4-hydroxy-3,5-dimethoxycinnamic acid (HDA), can also be effectively utilized for the multifunctional modification of PA66 fabric. The proposed modification method is mild, fast, and simple, offering a novel approach to the multifunctional modification of synthetic materials. The modified PA66 fabric holds potential in applications such as oily wastewater treatment , outdoor sportswear, tents, and other fields.
研究领域:
材料科学
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化学工程
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纺织科学
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环境科学
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生物技术
✓ 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）