LANGMUIR
·
2020
·
IF 3.557
Guangjian Peng,Yiheng Sun,Guijing Dou,Yahao Hu,Weifeng Jiang,Taihua Zhang
Accurate evaluation of the shell elastic modulus of microcapsules is of great significance to understanding their performance during production, processing, and applications. In this work, microcompression was employed to investigate the elastic behaviors of a single microcapsule. It was modeled as a microsphere with a core–shell structure compressed between two rigid plates. Based on the assumption that the contact pressure between the microsphere and plates obeys parabolic distribution, a microcompression method derived from the Reissner’s theory and the modified Hertz contact theory was established to evaluate the shell elastic modulus. Applications were carried out on poly(methylmethacrylate) (PMMA) microcapsules containing n-octadecane. The average elastic modulus of PMMA shells measured by the proposed microcompression method agrees well with that of the bulk PMMA sample. Furthermore, the elastic modulus of PMMA shells was found to have size dependence on the diameter of the microcapsules. Finally, finite element models combined with the newly proposed method were constructed to accurately predict the microcompression behaviors of microcapsules with different sizes.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yuhan Zhang,Ziqi Dong,Xiaodong Yang,Zengsheng Guo,Fangzheng Qi,Bo Xu,Guang-Ning Liu,Yiqiang Sun,Cuncheng Li
Passive daytime radiative cooling (PDRC) technology has garnered significant attention as a sustainable cooling solution that enables subambient cooling without additional energy input. The current design strategy for PDRC films mainly relies on composite porous matrices containing inorganic nanoparticles, which have bottleneck problems, such as low material utilization, high process complexity, and high manufacturing costs. In contrast, herein we develop a self-embedded cooling film through nonsolvent-induced phase separation, where poly(methyl methacrylate) (PMMA) nanoparticles spontaneously embed within a PMMA porous matrix. Through the synergistic interaction between particles and pores, an efficient broadband solar light scattering network was constructed, yielding a high solar reflectance of up to 95%. Meanwhile, the integrated structural design enhances the vibrational modes of intrinsic chemical bonds in PMMA, thereby improving mid-infrared radiative performance and enabling a high infrared emissivity of 96%. In addition, the fabrication process is fully scalable, requiring no filler doping or post-treatment. The film delivers a temperature reduction of 15.8 °C under direct sunlight, underscoring its strong potential for practical deployment in passive radiative cooling applications.
研究领域:
材料科学
·
纳米技术
·
光学
·
热工学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
He Zhang,Lucheng Li,Jun Chen,Jing Wang,Yang Liu,Huijie Zhang,Qiang Wang,Shuangqing Wang,Guoqiang Yang
Phthalocyanine compounds are a class of macrocyclic conjugated structures with 18 π-electrons. And have better photophysical properties. However, the π-π electron interactions lead to aggregation between phthalocyanine molecules, which affects optical limiting properties. In this work, the conjugated organic small molecule antiphenylenediamine ( PDA ) is grafted onto the phthalocyanine conjugate system through the azo condensation reaction , and the covalent organic framework polymer ( PDA-InPc ) was obtained. Then it is doped into the polymethyl methylmethacrylate ( PMMA ) matrix to produce a phthalocyanine solid device with different thickness ( PMMA-PDA-InPc ). The aggregation-free phthalocyanine covalent organic frameworks avoids intramolecular aggregation of the phthalocyanine units, and dispersing it in PMMA solid devices can also reduce intermolecular π-π stacking. As a result, the fluorescence lifetime of PMMA-PDA-InPc is τ 1 = 0.52 ns (A 1 = 95.71%) and τ 2 = 11.5 ns (A 2 = 4.29%), indicating that the phthalocyanine conjugated unit exists mainly as monomers (95.71%), while the proportion as aggregates is very small (4.29%). At the input laser energy of 9 μJ, the nonlinear absorption coefficient of PMMA-PDA-InPc device is (2.2 × 10 −9 m/W), which is significantly better than PMMA-InPc device (1.0 × 10 −9 m/W), indicating that PMMA-PDA-InPc has improved nonlinear absorption and reverse saturation absorption. This design idea of non-aggregated phthalocyanine covalent organic frameworks and its solid device expands a new idea for the development of useable phthalocyanine optical limiters .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 5
·1-11
·
IF 2.8
Sang Zhuo,He Liangyong,Yang Bin,Lu Tianyu,Kang Shijun,Sang Jiaojiao,Zheng Zhengzhi,Hu Weiqiang,Qian Jiasheng,Jia Ning,Ke Yuchao
In this work, free radical solution polymerization was used to prepare polymeric nanocomposite films by copolymerization of flexible butyl acrylate (BA) monomer and modified nano−silica with methyl acrylate (MMA) monomer. Our findings showed that the addition of BA monomer and nano−silica had limited effect on the transmittance of PMMA films, and the transmittance could achieve as high as 93%. Perfect overall properties of the as−prepared films (with a tensile strength of 36 MPa and an elongation at break of 42%) could be achieved when the monomer MMA:BA was set as 6:2 at a nano−silica content of 20 wt%. The PMMA−based nanocomposite films prepared in this work possessed excellent transparency, desired toughness and good hydrophobicity, which made them potentially promising for the applications as protective films for polarizing films.
研究领域:
材料科学
·
聚合物化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 29
·e54070
·
IF 3
Kai Wang,Chiyu Zhou,Yibo Zhou,Yijia Fan,Junkang Chen,Linghao Hui,Xinyuan Zhang,Jianbin Qin
High performance electromagnetic (EM) interference shielding composites are of high demand due to increasing EM wave radiation pollution. In this work, GO/NiNCs/PMMA microcellular foams with different GO/NiNCs gradient and 3D conductive filler framework were fabricated by thermal reduction and supercritical CO 2 foaming process. With the crosslink of 1D NiNCs and 2D GO sheets, GO/NiNCs framework with electrical conductivity varied from 1.15 × 10 −4 to highest 1.09 × 10 −1 S/m is fabricated, exhibiting absorption-dominated electromagnetic interference shieling effectiveness (EMI SE) of 53.62 dB and specific EMI SE of 48.44 dB g −1 cm 3 in X-band. The density of GO/NiNCs/PMMA microcellular foams achieved lowest value of 0.623 g/cm 3 . Moreover, the foams showed excellent thermal conductivity and compressive strength of 178.76 MPa, indicating excellent application potential in aerospace and electronic field. The thermoplastic polymer matrix also indicates great potential in recycle of the foam material.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3750-3758
·
IF 3.665
Si Chen,Changbo Xu,Meng Ma,Yanqin Shi,Huiwen He,Kaiyun Yuan,Ruqing Xu,Xu Wang
In this paper, a novel kind of PMMA copolymer, P(MMA- co -MAA- co -SPMA), with permanently antistatic, high toughness, and high transparent properties, was synthesized via radical copolymerization. Herein, we selected the appropriate compatibilizer α-methacrylic acid (MAA) and release agent (lauryldiethanolamine) through the calculation of solubility parameters for industrial mass production. What is more, the polymer's molecular weight was increased by improving the polymer's synthesis process. The structure and properties of the obtained copolymer were characterized. With 0.6 wt% of the 3-sulfopropyl methacrylate potassium salt (SPMA), the copolymer exhibits nearly unchanged transparency with neat PMMA, and its unnotched impact strength reaches 16 kJ/m 2 . The surface resistance of the copolymer could be reduced to 10 10 Ω, which could be considered as antistatic materials. Finally, the antistatic mechanism was analyzed. The main reason is that the hydrophilic group absorbs water to form a conductive layer on the surface, and 3-sulfopropyl methacrylate potassium salt (SPMA) is an ionic monomer that can form ion channels in water molecules, further accelerating the leakage of accumulated electrostatic charges and improving the antistatic properties of the copolymer. The method of selecting compatibilizers and release agents through solubility parameters provides more opportunities for the development of PMMA with excellent comprehensive performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 19
·6553
·
IF 3.748
Yuan Zhao,Tian Liang,Pengpai Miao,Tao Chen,Xiaobing Han,Guowen Hu,Jie Gao
The modification of polymers can significantly improve the ability to remove rare earth ions from wastewater, but so far few studies have focused on the irradiation-induced grafting method. In this study, a novel magnetic chelating resin for Ce(III) uptake was first synthesized by suspension polymerization of PMMA@Fe3O4microspheres followed by irradiation-induced grafting of glycidyl methacrylate (GMA) and subsequent amination with polyethyleneimine (PEI). The FT-IR, SEM, TG and XRD characterization confirmed that we had successfully fabricated magnetic PMMA-PGMA-PEI microspheres with a well-defined structure and good thermal stability. The obtained adsorbent exhibited a satisfactory uptake capacity of 189.81 mg/g for Ce(III) at 318.15 K and an initial pH = 6.0. Additionally, the impact of the absorbed dose and GMA monomer concentration, pH, adsorbent dosage, contact time and initial concentration were thoroughly examined. The pseudo-second order and Langmuir models were able to describe the kinetics and isotherms of the adsorption process well. In addition, the thermodynamic data indicated that the uptake process was spontaneous and endothermic. Altogether, this research enriched the Ce(III) trapping agent and provided a new method for the removal rare earth pollutants.Keywords:magnetic PMMA microspheres;PEI;radiation induced grafting;Ce(III) adsorption
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Dongchun Chen,Mingyao Hong,Jianglong Wan,Weishan Li,Youhao Liao
The safety of lithium metal batteries (LMBs) is a critical barrier to their further development towards achieving higher energy densities exceeding 400 Wh kg −1 . Although the incorporation of flame-retardant additives into the liquid electrolyte can enhance the safety of LMBs, it often compromises electrochemical performance. To achieve a balance, a flame-retardant separator with thermally responsive properties has been developed by coating a core-shell flame-retardant polymer (poly(methyl methacrylate) (PMMA) as the shell and tris (pentafluorophenyl) phosphine (TPFPP) as the core) onto a polyethylene (PE) separator using an aqueous technique. Compared to the original PE separator, the TPFPP@PMMA flame-retardant separator exhibits superior mechanical strength and electrolyte wettability, along with significantly improved flame retardancy and thermal stability. Due to the excellent compatibility of PMMA polymer with lithium anode, a stable cycle life of over 500 hours for the Li||Li symmetrical coin cell has been achieved. The capacity retention of the Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 battery is higher than that of the PE separator (80.0% vs. 65.8%) after 100 cycles between 3.0 V and 4.35 V, ascribed to the formation of a stable and robust cathode electrolyte interface (CEI) film, primarily composed of rich LiF and poor Li 2 CO 3 on the cathode surface, induced by the PT/PE separator. Thus, the developed flame-retardant separator offers new prospects to the revival of high-energy-density LMBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Yufei Tang,Lei Chen,Zihao Duan,Kang Zhao,Zixiang Wu
Barium titanate (BaTiO 3 ) has been used as a bone implant material because of its piezoelectric properties and the ability to promote cell growth when combined with hydroxyapatite. However, the brittleness of BaTiO 3 inhibits its use as a bone replacement material at load-bearing sites, and the reduction of BaTiO 3 content in the composite reduces its piezoelectric effect on bone growth. In this study, we explored a preparation method, which included directional freeze casting and self-solidification of bone cement, to obtain 1-3-type BaTiO 3 /PMMA bio-piezoelectric composites with a lamellar structure. The lamellar BaTiO 3 layer through the composite from the bottom to the top significantly improved the piezoelectric properties of the composite. In addition, the dendritic ceramic bridges on the BaTiO 3 pore walls can improve the compressive strength and elastic modulus of BaTiO 3 /PMMA bio-piezoelectric composites with a lamellar structure. More importantly, it was found that polarized lamellar BaTiO 3 could induce osteoblasts to grow in the direction of the BaTiO 3 layers. When the width of the BaTiO 3 layer was in the range of 8–21 μm, osteoblasts along the BaTiO 3 layer showed well growth, which can be of great value for the production of biomimetic bone units.
研究领域:
生物医学工程
·
材料科学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2018
·Vol. 11
·期 12
·2444
·
IF 2.467
Shenggui Chen,Junzhong Yang,Yong-Guang Jia,Bingheng Lu,Li Ren
With the rapid application of light-curing 3D printing technology, the demand for high-performance polymer resins is increasing. Existing light-curable resins often have drawbacks limiting their clinical applications. This study aims to develop a new type of polymethyl methacrylate (PMMA) composite resins with enhanced mechanical properties, high antibacterial activities and excellent biocompatibilities. A series of reinforced composite resins were prepared by mechanically mixing PMMA with modified cellulose nanocrystals (CNCs), which were coated with polydopamine and decorated by silver nanoparticles (AgNPs) via Tollen reaction. The morphology of CNCs-Ag was observed by transmission electron microscopy and the formation of AgNPs on CNCs was confirmed by X-Ray photoelectron spectroscopy analyses. Functional groups in PMMA-CNCs-Ag composites were verified by Fourier Transform infrared spectroscopy (FTIR) spectroscopy. The mechanical assessment and scanning electron microscopy analysis suggested that the evenly distributed CNCs-AgNPs composite effectively improve mechanical properties of PMMA resin. Cytotoxicity assay and antibacterial activity tests indicated excellent biocompatibility and high antibacterial activities. Furthermore, PMMA with CNCs-AgNPs of 0.1 wt.% (PMMA-CNCs-AgNPs-0.1) possessed the most desirable mechanical properties owing to the homogeneous distribution of AgNPs throughout the resin matrix. This specific composite resin can be used as a functional dental restoration material with potential of other medical applications.Keywords:3D printing;PMMA-CNCs-Ag;composite resin;biocompatibility;antibacterial activity
研究领域:
材料科学
·
生物医学工程
·
牙科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 11
·2102848
·
IF 10.05
Xiaoxiao Xu,Ting Zhu,Ke Xiao,Yu Zhu,Jiaming Chen,Dongke Li,Ling Xu,Jun Xu,Kunji Chen
The preparation of high-efficiency perovskite light-emitting devices (PeLEDs) in the air-ambient has always been a challenge. Herein, the authors propose a Si-based near-infrared air-processed PeLED through the anti-solvent engineering. Two materials, poly(methyl methacrylate) (PMMA) and tetrabutylammonium hexafluorophosphate (TBAPF 6 ) are co-doped into the anti-solvent, the former protects the perovskite from degradation in a high-humidity atmosphere, and the latter passivates the defects on perovskite surface and increases the conductivity. Through the anti-solvent engineering, the efficiency of PeLEDs has been significantly enhanced and obtains a maximum external quantum efficiency (EQE) of 10.4%, which is the highest among similar devices. This work shows that it is possible to prepare high-efficiency near-infrared PeLEDs in air-ambient through a simple method.
研究领域:
材料科学
·
光电工程
✓ 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）