FIBERS AND POLYMERS
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2026
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IF 3.1
Hu Yale,Song Xiaodi,Li Yuanyuan,Cheng Meijia,Jing Hao,Qian Neng,Fan Shuo
Polyamide 6 (PA6) fabric is widely used in textile applications owing to its excellent physical and mechanical properties. However, its high flammability and severe melt-dripping behavior during combustion significantly limit its application in fire-sensitive fields. In this study, a phosphorus–nitrogen-containing polysiloxane flame retardant (NPSi) was synthesized and synergistically combined with thiourea (TU) to enhance the flame retardancy of PA6 fabric. The thermal stability, combustion behavior, mechanical properties, and flame-retardant mechanisms of the treated PA6/TU/NPSi fabric were systematically investigated. Owing to the synergistic interaction between TU and NPSi, the flame retardancy of PA6 fabric was markedly improved, particularly with respect to melt-dripping suppression. The PA6/TU/NPSi fabric achieved a UL-94 V-0 rating and exhibited a limiting oxygen index (LOI) of 29%. Compared with pristine PA6 fabric, the peak heat release rate (PHRR) and total heat release (THR) of the PA6/TU/NPSi-3 fabric decreased by 80.0% and 47.8%, respectively. This enhanced fire safety performance was primarily attributed to the formation of a dense and continuous char layer in the condensed phase, together with the release of non-combustible gases in the gas phase.
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Qi Tang,Kang Wang,Xiaoming Ren,Qunchao Zhang,Weiwei Lei,Tao Jiang,Dean Shi
Antibacterial polymer membranes have been widely used in many fields of our daily life. In this study, porous PA6 membrane with ZnO nanoparticles attaching on to the surface of inner pore walls is prepared. Firstly, SMA (styrene maleic anhydride copolymer) is used to graft onto the surface of ZnO nanoparticle in DMF (dimethylformamide). Then the pre-treated ZnO nanoparticles (ZnO-SMA) are added into SEBS (Styrene-ethylene-butylene-styrene copolymer)/PA6 (60/40 wt/wt) blends with co-continuous morphology. The effects of SMA molecular structure (molecular weight and maleic anhydride content) used for ZnO-SMA nanoparticles on their dispersion states in SEBS/PA6/ZnO-SMA nanocomposites are investigated. When SMA3 (MAH = 8 wt%, Mn = 250,000 g mol −1 ), which has relatively higher molecular weight and lower MAH content, is used as the pre-treating agent, ZnO-SMA3 nanoparticles tend to be dispersed at the phase interface in SEBS/PA6/ZnO-SMA nanocomposites. However, when SMA2 (MAH = 23 wt%, Mn = 110,000 g mol −1 ) with relatively lower molecular weight and higher MAH content is used, no ZnO-SMA2 nanoparticles locate at the interface but stay within PA6 phase. Porous PA6 membranes are obtained by selectively etching SEBS phase out with xylene. It can be found that porous PA6 membrane containing ZnO-SMA3 nanoparticles still exhibits much better antibacterial property (R = 3.76) toward S. aureus even at a very low ZnO content (0.5 wt%). This result should be ascribed to almost all the ZnO-SMA3 nanoparticles being exposed to the surface of inner pore walls of PA6 membrane. This work proposes an effective method to prepare porous polymer membrane with functional nanoparticles selectively located at the inner pore walls.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Longxuan Gao,Fei Yan,Shengtao Dai,Lianshuang Zhao,Junming Wang,Yu Liu,Yuhui Ao,Liu Liu
To improve the unsatisfactory interfacial adhesion of carbon fiber/polyamide-6 (CF/PA6) composites, a hyperbranched waterborne polyurethane (HWPU) sizing agent with high-solid content was designed. As a carboxy chain extender for HWPU, carbic anhydride-tris(hydroxymethyl)methyl aminomethane (CA-THAM) with a self-catalytic capacity was synthesized to accelerate the chain extension. The synthesized hyperbranched polyurethane exhibited low viscosity, along with a strong double-electron layer conformation after dispersing in water. The electrostatic repulsion between the latex particles effectively prevented agglomeration, delivering a high solid content of 58% for the sizing agent. The influence of different sizing agent concentrations on the wettability of CF as well as the interfacial properties of composites was systematically studied. Compared with unsized CF/PA6 composites, the interlaminar shear strength and flexural strength of CF-1.5 wt%/PA6 composites were up to 60.3 MPa and 508.4 MPa, with an increment of 50.3% and 27.7%, respectively. Furthermore, the interfacial strengthening mechanism of sizing agent was discussed. The preparation of this high-solid content sizing agents was facile and environmentally friendly, which would hopefully reduce costs during the transportation.
研究领域:
材料科学
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复合材料工程
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DOI
高影响因子
Nano Materials Science
·
2021
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IF 0
Tianqi Liang,Jie Liu,Zhaoyang Wei,Dean Shi
In this study, CuO nanoparticles are pre-modified with styrene-maleic anhydride copolymers (SMAs) of different molecular weights and MAH contents. Then the pre-modified CuO nanoparticles (CuO-SMAs) are added to the PA6/SEBS (Styrene Ethylene Butylene Styrene copolymer) (40/60 wt/wt) polymer blends with a co-continuous morphology. When SMA3 (MAH = 8 wt%, M n = 250000 g/mol) is used to modify CuO nanoparticles, and the grafting degree of SMA3 on the surface of CuO reaches 2.74 wt%, 90.71% of the added mCuO-SMA3 nanoparticles can be located at the interface of PA6 and SEBS. A porous PA6 membrane with CuO nanoparticles located at the pore walls can be obtained after the SEBS phase is etched with xylene. The catalytic reaction velocity constant (k) for the reduction of p-nitrophenol in NaBH 4 solutions with the PA6/mCuO-SMA3 porous membrane can reach 1.0040 min -1 . This work provides a feasible and straightforward method for the preparation of porous polymer membranes with functional nanoparticles located at the wall of the pores.
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
GREEN CHEMISTRY
·
2024
·
IF 9.3
Shengtao Dai,Fei Yan,Siyu Zhang,Jiaming Guo,Lin Zhang,Yu Liu,Liu Liu,Yuhui Ao
The scientific community has dedicated the past decade to integrate its resources in pursuit of “sustainable development”, aiming to pave the way for a perpetually eco-friendly and sustainable future. As a part of this collective effort, traditional petroleum-based polyurethanes have been progressively substituted by environmentally friendly alternatives. In this study, a conservation-minded approach was implemented using a green solvent, γ-valerolactone, along with fully biogenic-derived reagents: epoxidized soybean oil, tartaric acid and L-lysine diisocyanate to develop a hyperbranched waterborne polyurethane (HWPU) sizing agent. Meanwhile, tertiary amine was integrated into the polyol structure, facilitating the self-catalytic process en route to polyurethane, thereby eliminating the need for highly toxic catalysts. The meticulously developed fully bio-based sizing agent notably enhanced the interfacial properties between the carbon fiber (CF) and nylon 6 resin matrix. Comprehensive mechanical property evaluations of the modified composites revealed 49.4% and 49.6% improvements in flexural strength and interlaminar shear strength, respectively, compared with pristine CF composites. Additionally, interfacial shear strength tests demonstrated a substantial increase of 66.1%. This work presents an attractive avenue for the prospective industrial production and application of a green HWPU sizing agent.
研究领域:
材料科学
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绿色化学
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复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2019
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IF 6.864
Shuo Fan,Bo Peng,Ruchao Yuan,Dequn Wu,Xueli Wang,Jianyong Yu,Faxue Li
Preparing flame-retardant polyamide 6 (PA6) composites with low addition of flame retardant remained one of the biggest concerns nowadays. In this work, a novel aromatic Schiff base-containing branched polysiloxane (PCNSi) with high thermal stability and great capacity of charring was first synthesized as a self-crosslinking flame retardant, and then PA6/PCNSi composites were prepared through melt blending with different contents of PCNSi. Inspiringly, a sharp reduction of about 48.9% in peak heat release rate (PHRR) was found for PA6 composite with only 6 wt% of PCNSi in contrast with PA6, and serious melt-dipping behavior of PA6 was suppressed totally as 4 wt% of PCNSi was added into PA6. The formation of a self-extinguished layer was considered as the essential factor for reinforcing the flame retardancy of PA6. This layer was generated under the synergistic effects of the cross-linking reaction of Schiff base structure and thermo-oxidative degradation of polysiloxane units in PCNSi. These composites also presented similar mechanical properties to PA6 due to the low addition of PCNSi and good interfacial interactions between PCNSi and PA6.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jipeng Guan,Yaru Yang,Bolin Tang,Xiaojun Shen,Yongjin Li
The non-spherical Janus nanosheets (JNSs) have been large-scale synthesized by grafting polystyrene (PS) chains and epoxy group on the opposite sides of JNS, denoted as epoxy-silica-PS JNS. The functional JNSs are employed as compatibilizer in the immiscible polyamide 6 (PA6)/polystyrene (PS) blend. In the melt-blending process, the JNS with epoxy group can react with carboxyl (amino)-capped PA6 and in-situ form the PA6-silica-PS JNS. Owing to the amphiphilicity and Pickering effect, the JNSs can be exclusively located at the polymeric interface and assemble into the nanosilica monolayer at 0.5 wt% loading. With increasing the JNSs loading, the size of dispersed PS phase is decreased gradually and the JNSs still maintain the single layer structure at the interface. The dynamic moduli of the blends have been effectively improved for the JNSs at the interface. This report provides an extended application of Janus nanosheets to stabilize and functionalize the polymeric interface.
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mo Zou,Jingzhi Chen,Zhaoyang Wei,Weiwei Lei,Jun You,Jie Liu,Qunchao Zhang,Dean Shi
Core-shell particles with rigid core and soft rubber shell have been proven to be effective in strengthening and toughening polymers simultaneously when the rubber shell thickness is controlled within a critical range. However, the critical value of the so-called thickness-to-diameter ratio τ (the ratio of the rubber shell thickness to the rigid core diameter) obtained in the previous work are all from polymer blends containing core–shell particles with monodispersed particle size. Does the critical τ value still exist in the core–shell toughening system with polydisperse particle sizes? Is it possible to produce core–shell particles with polydisperse particle sizes but the same τ value? In this paper, the post-emulsification method is first reported to prepare core–shell particles with polydisperse SiO 2 particles as the rigid core and ethylene–vinyl acetate copolymer grafted maleic anhydride (EVA- g -MAH) as the rubber shell, in which the thickness of the rubber shell can be well controlled and tuned via varying the feeding weight ratio of SiO 2 and EVA- g -MAH. The τ value is only determined by the weight ratio of SiO 2 and rubber, and has nothing to do with the SiO 2 particle size. A series of polyamide 6 (PA6)/SiO 2 @EVA core–shell toughening systems are prepared via melt blending process. It is proved the existence of the critical τ value ( τ cbd ) above which brittle-ductile transition happens in the core–shell toughening system with polydisperse core–shell particle sizes. The value of τ cbd is 0.069 in PA6/SiO 2 @EVA core–shell toughening system.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）