INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Cui Xu,Xiao Jia,Jun Du,Feng Zhou,Bin Liu,Yamin Deng,Xiulan Huai
Thermally conductive structural adhesives (TCSAs) are rendered high requirements with the rapid development of electronic devices towards miniaturization, light-weight and electrically insulating performance. Improving heat dissipation capacity and mechanical properties are both critical for the application of TCSAs as the interconnected materials between chips and metal substrates. Herein, we prepared environment-friendly TCSAs with different hard segments (HS) contents by using castor oil-based polyurethane (PU) as matrix and alumina (Al 2 O 3 ) as thermal conductive filler through an extremely facile mechanical-mixing process. Impressively, the TCSA with 49.3% HS content exhibited an intense notable tensile stress of 8.6 MPa, a high elongation at break of 21%, and an excellent lap shear strength to different substrates, including organic glass (7.7 MPa), steel (9.5 MPa), cooper (10.3 MPa) and aluminum (14.2 MPa). Furthermore, the thermal conductive pathways in composites with 75 wt% Al 2 O 3 fillers endow its good thermal conductivity with thermal conductivity k of 1.23 W/(m·K), 4.7 times higher than that of pure PU ( k = 0.26 W/m·K). Overall, our fabricated TCSAs not only possessed superior mechanical performances but also high thermal conductivity, as well as showed great potential in thermal management application fields due to its simple and environmental fabricating method.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Engineering
·
2022
·
IF 12.834
Meng-En Li,Hai-Bo Zhao,Jin-Bo Cheng,Ting Wang,Teng Fu,Ai-Ning Zhang,Yu-Zhong Wang
To develop an efficient way to overcome the contradiction among flame retardancy, smoke suppression, and thermal insulation in expanded polystyrene (EPS) foams, which are widely used insulation materials in buildings, a novel “green” porous bio-based flame-retardant starch (FRS) coating was designed from starch modified with phytic acid (PA) that simultaneously acts as both a flame retardant and an adhesive. This porous FRS coating has open pores, which, in combination with the closed cells formed by EPS beads, create a hierarchically porous structure in FRS–EPS that results in superior thermal insulation with a lower thermal conductivity of 27.0 mW·(m·K) − 1 . The resultant FRS–EPS foam showed extremely low heat-release rates and smoke-production release, indicating excellent fire retardancy and smoke suppression. The specific optical density was as low as 121, which was 80.6% lower than that of neat EPS, at 624. The FRS–EPS also exhibited self-extinguishing behavior in vertical burning tests and had a high limiting oxygen index (LOI) value of 35.5%. More interestingly, after being burnt with an alcohol lamp for 30 min, the top side temperature of the FRS–EPS remained at only 140 °C with ignition, thereby exhibiting excellent fire resistance. Mechanism analysis confirmed the intumescent action of FRS, which forms a compact phosphorus-rich hybrid barrier, and the phosphorus-containing compounds that formed in the gas phase contributed to the excellent flame retardancy and smoke suppression of FRS–EPS. This novel porous biomass-based FRS system provides a promising strategy for fabricating polymer foams with excellent flame retardancy, smoke suppression, and thermal insulation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46612
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IF 1.901
Jian Zhang,Jing-Wen Wang,Ren-Kui Ge
In order to improve the adhesion strength of acrylic adhesive to untreated poly(ethylene terephthalate) (PET) substrate, two-component acrylic structural adhesives initiated by tributylborane were prepared. The effects of acrylic monomers, elastomers, decomplexers, and oligomers on the adhesion properties of two-component acrylic structural adhesive were investigated in sequence. It is found that the shear strength on PET of adhesives toughened by acrylonitrile–butadiene–styrene copolymer and carboxyl-terminated butadiene–acrylonitrile copolymer is higher than that of commercial adhesives Dp8010NS and Loctite 3030. A tailored oligomer was synthesized from hydroxyl propyl–terminated polydimethylsiloxane and 3-isopropenyl-α,α-dimethylbenzyl isocyanate. It is also noticed that premature failure usually takes place in the lap shear test samples due to the brittleness of the acrylic adhesive, except in the sample of adhesive modified by tailored oligomer. Excellent adhesion to the PET substrate is achieved by this adhesive modified by tailored oligomer, with a lap shear strength above 11 MPa and T-peel strength up to 5.34 N/mm. Additionally, the resulting adhesive is qualified for the structural bonding of PET materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46612.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Mengqi Le,Wen Huang,Zunwei Ma,Zhifeng Shi,Qingtao Li,Caihong Lin,Lin Wang,Yong-Guang Jia
It is urgent to develop biocompatible and high-efficiency antimicrobial agents since microbial infections have always posed serious challenges to human health. Herein, through the marriage of facially amphiphilic skeletons and cationic dendrimers, high-density positively charged dendrimers D-CA6-N+ (G2) and D-CA2-N+ (G1) were designed and synthesized using the “branch” of facially amphiphilic bile acids, followed by their modification with quaternary ammonium charges. Both dendrimers could self-assemble into nanostructured micelles in aqueous solution. D-CA6-N+ displays potent antibacterial activity against Staphylococcus aureus and Escherichia coli, with minimum inhibitory concentrations (MICs) as low as 7.50 and 7.79 μM, respectively, and has an evidently stronger antibacterial activity than D-CA2-N+. Moreover, D-CA6-N+ can kill S. aureus faster than E. coli. The facial amphiphilicity of the bile acid skeleton facilitates the selective destruction of bacterial membranes and endows dendrimers with negligible hemolysis and cytotoxicity even under a high concentration of 16× MIC. In vivo studies show that D-CA6-N+ is much more effective and safer than penicillin G in treating S. aureus infection and promoting wound healing, which suggests facially amphiphilic skeleton-derived cationic dendrimers can be a promising approach to effectively enhance antibacterial activity and biocompatibility of antibacterial agent, simultaneously.
研究领域:
材料科学
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药物化学
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生物医学工程
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Qiao Qin,Daidong Wei,Jiamin Gan,Yunpeng Gong,Tao Jin
Thermal conductive structural adhesives offer a robust solution for injection into the battery core of power battery packs in new energy vehicles, effectively providing filling, protecting, and facilitating timely heat dissipation. In this work, a series of castor oil (CO)-based polyurethane prepolymers with different isocyanate (NCO) contents were synthesized by a solvent-free method, which designated as Component B (curing agent) for the CO-based polyurethane (CIPU) adhesives. Polyaspartic acid ester (PAE) resin compounded with poly (tetramethylene ether glycol) (PTMG) of different molecular weights, constituted Component A of the CIPU adhesives. The effect of mass ratio of PAE to PTMG (M value) on mechanical performance of the CIPU adhesives under different curing agent conditions was investigated. The results indicated optimal overall performance for the CIPU adhesive with an M value of 3, exhibiting a tensile strength of 10.25 MPa, an elongation at break of 107.14%, and a steel-steel tensile shear strength of 4.7 MPa. Subsequently, a series of CIPU thermal conductive structural adhesives were prepared by introducing thermal conductive fillers into the optimized CIPU adhesive formula. The introduction of a 35% Boron nitride content yielded a CIPU thermal conductive structural adhesive with a thermal conductivity of 0.64 W/m·K, and a steel-steel tensile shear strength of 6.97 MPa. These innovative CIPU thermal conductive structural adhesives prepared herein are expected to be applied in the new energy automotive and electronics industries.
研究领域:
材料科学
·
化学工程
·
高分子科学
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粘合剂技术
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汽车工程
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Xinpeng Hu,Bingqing Quan,Zhanjin Shi,Xiangyu Zhao,Gangchen Lu,Yang Ding,Jiancheng Lai,Jinping Qu,Yucan Peng,Xiang Lu
Passive daytime radiative cooling (PDRC) offers a sustainable route to reducing cooling energy consumption and greenhouse gas emissions. However, conventional PDRC materials exhibit limited cooling power (<150 W m −2 ), insufficient for growing cooling demands. While integrating phase change materials enhances cooling capacity, to balance radiative cooling, latent heat, and heat transfer performances remains challenging due to their conflicting requirements. Inspired by the light scattering mechanism of nacre-pearl systems, hierarchically microstructured radiative-phase change hybrid cooling (RPHC) composites with a homogeneous morphology are developed via a water pre-removal strategy. The composite combines a multilayered microfibrillated cellulose (MFC) matrix with core–shell phase change capsules (PCCs), achieving solar reflectivity of 0.969 and mid-infrared emissivity of 0.958. Efficient PCC integration provides a high latent heat of 132.1 J g −1 . This nacre-pearl-inspired design enables a record-high PRHC power of 226 W m −2 and an average temperature reduction of 10.1 °C below ambient. Applied to building envelopes, the MFC/PCC composite reduces cooling energy use by up to 4.4%, potentially cutting global CO 2 emissions by 1.22 billion metric tons annually. Overall, this work provides innovative energy-saving materials for energy savings and carbon neutrality.
研究领域:
材料科学
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可持续能源
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热管理
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建筑节能
·
仿生学
✓ 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）