JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 4
·1-12
·
IF 2.8
Chen Fanfan,Wang Chiyi,Liu Xiaoyun,Wang Zhifen,Fang Lin,Zhang Yucang
The conversion of solid chitin into liquid low-molecular-weight polyol compounds using liquefaction technology can realize the high-value utilization of shrimp and crab shell marine waste. In this study, chitin liquefaction was conducted using sulfuric acid as the catalyst and propanetriol and polyethylene glycol as the liquefying agents. Thereafter, the acid number, hydroxyl value, viscosity and molecular weight of the chitin liquefaction product were tested and characterized. A polyurethane foam with low thermal conductivity and high mechanical strength was successfully synthesized. The preparation process was regulated by reacting the hydroxyl group that is abundant in chitin liquefaction with isocyanate instead of polyether polyol. Moreover, adding dimethyl methyl phosphate into the polyurethane to prepare flame retardant polyurethane foam. The flame retardance and thermal-insulation properties of the polyurethane foam synthesized using the chitin liquefaction product are significantly better than those of traditional polyol polyurethane foam, which broadens the application scope of polyurethane foam.
研究领域:
材料科学
·
海洋生物资源利用
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jieyu Wang,Aijun Han,Mingquan Ye,Chenlu Chen,Xin Chen,Xufei Zhu
In this paper, a series of coated fabrics based on Fe-doped BaSnO3 (BaSn1–xFexO3−δ, x = 0.00, 0.05, 0.10, 0.20, 0.25) powder pigments were prepared. The results indicate that the developed pigments are substitutional solid solutions with no impurity and the valencies of iron confirmed by X-ray photoelectron spectroscopy (XPS) are +2 and +3. The BaSn1–xFexO3−δ pigments possess high near-infrared (NIR) solar reflectance (64.92–79.81%), and the change in the near-infrared reflectance value can be explained by the free carrier concentration and electron trap theory. The pigments exhibit the alteration of yellow-green to brown, which is ascribed to the charge-transfer transition (Sn 5s + 5p ↔ Fe 3d). The BaSn1–xFexO3−δ-coated fabrics exhibit excellent high NIR solar reflectance and thermal insulating performance. The NIR solar reflectance of the BaSn0.80Fe0.20O3−δ-coated fabric is up to 64.30%. Compared with those of brown uncoated fabric and conventional brown (Pigment Yellow 42) coated fabric, the inner surface temperature of the BaSn0.80Fe0.20O3−δ-coated fabric is lowered by 7.6 and 4.2 °C, while the heat absorption is reduced by 51.0 and 37.9%, respectively. The coated fabric shows excellent washing durability and chemical stability. In summary, these coated fabrics have the potential to serve as thermal insulation coated fabrics.
研究领域:
材料科学
·
纺织工程
·
能源与环境
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Long Ni,Yinfu Luo,Chen Qiu,Lu Shen,Huawei Zou,Mei Liang,Pengbo Liu,Shengtai Zhou
Mechanically flexible polyimide foams (PIFs) with exceptional high temperature thermal insulation properties were fabricated by microwave-assisted foaming and post thermal imidization process, using polyester ammonium salt (PEAS) precursor powders which consisted of different molecular chain structures as the derivatives. A comparison of foaming behavior, pore morphology, mechanical and thermal insulation properties between PIFs prepared with mono-dianhydride and copolymerized dianhydride structures was systematically studied. Results showed that the optimum foaming temperatures of PEASs was in the range of 85–150 °C, which correlated with the volatilization of solvents such as H 2 O, tetrahydrofuran and methanol. The introduction of copolymerized dianhydride structure altered the chain rigidity and melt viscosity of PEAS, which improved the cellular structure and mechanical flexibility of PIFs. Moreover, the micron-scale cellular structure of PIFs was determined by melt viscosity, chain rigidity, volatile content and foaming temperatures. The PIFs exhibited low apparent densities (25–30 kg/m 3 ), high open cell rate (95–97%) and mechanical flexibility (compression/release recover rate: 96–99%). All PIFs possessed exceptional thermal stability and thermal insulation properties which can be targeted for thermal insulation applications in the fields of aerospace, transportation, and microelectronics among others.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhenfeng Guo,Tianqi Zhang,Xiaoqing Wang,Chenyu Mi,Zitao Guo,Guanghui Zhang,Benxue Liu,Yongshuai Xie,Luyi Zhu,Xinqiang Wang
The demands for high-temperature resistant thermal insulation materials in the realms of aviation, aerospace, and military technology are constantly escalating. The development of thermal insulation materials capable of stable operation at high temperatures above 1200 °C has become a significant research direction. In response, Gd 2 Zr 2 O 7 has emerged as a promising flexible thermal insulation material due to its low thermal conductivity, high melting point and thermal stability. This study addresses the challenge of fabricating Gd 2 Zr 2 O 7 nanofibers with superior mechanical properties and high-temperature stability. Defect fluorite-structured Gd 2 Zr 2 O 7 nanofibers were prepared by using the sol-gel method and electrospinning technique. The resulting nanofibers exhibited small grain size (84.5 nm@1300 °C), dense structure and high tensile strength (1.69 MPa@1100 °C), excellent bending fatigue resistance (recoverable bending strain up to 80 %). Additionally, the nanofibers demonstrated high strength retention (68 %) and low area shrinkage (<2 %) after heat-treatment at 1300 °C, indicating excellent high-temperature stability. The thermal conductivity of Gd 2 Zr 2 O 7 nanofiber membranes was very low (26.2 mW·m −1 ·K −1 @1300 °C), showcasing outstanding high-temperature insulation property. Therefore, the simple and effective preparation method proposed in this study, along with the superior thermal insulation performance of the Gd 2 Zr 2 O 7 nanofibers, shows great potential for large-scale practical applications.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hailong Li,Chen Zhuo,Fangxin Zou,Danhui Wang,Shugang Xu,Peiqi Xu,Zeyuan Liu,Fei Lv,Xukun Wang,Chao Li,Huimei Feng,Shouhai Zhang,Xigao Jian
Preparation of porous materials from high-performance polymers holds great promise for various advanced engineering applications like thermal insulation . However, it is still a great challenge to fabricate them due to the difficulties in manufacturing them. Herein, a high performance polymer material poly(aryl ether sulfone ketone)s containing phthalazinone and biphenyl moieties (PPBESK) was utilized to fabricate porous materials via a frequently used and simple method named non-solvent induced phase separation (NIPS). Macro porous PPBESK beads have been fabricated in different non-solvent coagulation baths. The kinetics of the phase inversion processes are visualized by the optical microscope. The multi-scale porous structures formed inside the beads endow them an excellent thermal insulation performance in a wide temperature window and a high mechanical performance that the compression modulus is more than 50 times higher than Polystyrene (PS) foam. Therefore, these PPBESK beads provide an optimized combination of functionalities including high mechanical strength and good thermal insulation, which could turn out to be useful in harsh environmental applications.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 10
·2986
·
IF 4.412
Ling Lin,Haiyan Mao,Ziyin Li,Wenyao Li,Chaoxia Wang
Optically active polymers are promising multifunctional materials with great application potentials. Herein, environmentally friendly optically active polyurethanes (OPUs) were obtained by introducing rotatory binaphthol monomer to polyurethane. The influence of binaphthol monomer content on the structure, mechanical properties, infrared emissivity, and thermal insulation of OPUs was studied intensively. Structure characterization indicated that the optically active polyurethanes have been successfully synthesized. The OPU synthesized with BIMOL and BDO at the mole ratio of 1:1 presented better thermal resistance. In addition, OPUs showed enhanced tensile strength and stretchability with the increase of BINOL content to a certain extent due to its rigid structural features and high molecular weight. The optically active polyurethanes showed lower infrared emissivity values (8–14 μm) than waterborne polyurethane (WPU), and the infrared emissivity decreased from 0.850 to 0.572 as the content of the BINOL monomer increased. Moreover, OPU4 exhibited the best heat insulation and cooling ability with about a 7 °C temperature difference. The thus-synthesized optically active polyurethanes provide an effective solution for developing highly effective thermal insulation materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Chao Yan,Yiqun Fang,Mengfan Yan,Weihong Wang,Yongming Song,Qingwen Wang
As global energy consumption and environmental pollution are becoming more and more serious, the utilisation of biomass materials is gaining more and more attention. In this study, we introduced a cost-effective and simple method for the preparation of hydrophobic wood using natural balsa wood (NW), which involves in-situ growth of stearoyl chloride on the NW surface through a one-step esterification process, converting its hydrophilic surface into a hydrophobic one (denoted as NW-Ste). The results showed an increase in surface roughness (Rb) from 5.6 to 156.5 nm and a contact angle of over 145.2° on the wood surface. Hydrophobic wood has excellent hydrophobicity, reusability and significant thermal insulation properties. Importantly, the inherent mechanical strength of the hydrophobic NW obtained through the treatment remains unchanged, expanding the range of applications for the wood.
研究领域:
材料科学
·
生物质利用
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yue Feng,Jianjun Xu,Baohua Yuan,Longxiang He,Luoning Zhang,Yongchuan Hu,Liezheng Lyu,Cheng Zou,Qian Wang,Meina Yu,Yuanwei Chen,Yanzi Gao,Huai Yang
As a type of smart window, polymer dispersed liquid crystal (PDLC) electrically controlled dimming film can respond to external electrical stimuli to regulate the optical flux of sunlight, reducing energy consumption. Herein, a PDLC film was prepared by systematically studying the functionalities and structural compatibility of vinyl ether and thiol compounds, and the optimal PDLC film possesses a superior contrast ratio ( CR ) of 196.9. When the film thickness is adjusted to 8 μm, the film saturation voltage is reduced to 6.7 V, still maintaining a high CR of 48.4. The well-designed PDLC films exhibited excellent modulation of light. The temperature difference between PDLC film and bare ITO glass can reach 4 °C under the simulated sunlight test, demonstrating the good thermal insulation performance. This smart films with low power consumption and high CR can meet the demand for active regulation of optical flux on smart windows.
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
Polymers
·
2024
·Vol. 16
·期 11
·1544
·
IF 4.7
Shu Wang,Jianyu Pu,Shuquan Xu,Yuanhao Tian,Qian Shu,Rui Zou,Tonghua Zhang
The development of smart protective clothing will help detect injuries from contact sports, traffic collisions, and other accidents. The combination of ecoflex, spacer fabric, and graphene-based aerogel provides a multifunctional composite. It shows a strain sensitivity of 17.71 at the strain range of 40~55%, a pressure sensitivity of 0.125 kPa−1at the pressure range of 0~15 kPa, and a temperature sensitivity of −0.648 °C−1. After 50 impact tests, its protection coefficient only dropped from 60% to 55%. Additionally, it shows thermal insulation properties. The compression and impact process results of finite element numerical simulation analysis are in good agreement with the experimental results. The ecoflex/aerogel/spacer fabric sensor exhibits a simple structure, large pressure strain, high sensitivity, flexibility, and ease of fabrication, making it a candidate for smart protective clothing resistant to impact loads.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhengdong Li,Xueying Zhang,Liwen Yan,Haiyan Du,Anran Guo,Ying Mu,Jiachen Liu
High emissivity coatings on hypersonic vehicle surfaces dissipate heat by emitting thermal radiation. While the difficulty of increasing emissivity limits the performance of coatings to improve heat-dissipation of the thermal insulation felt. Herein, a novel high-reflectivity and high-emissivity integrated double-layer coating was developed to enhance the thermal insulation performance of the alumina fiber fabric. The coating comprised of TiO 2 @SiO 2 (T@S) as reflective agent and ZrO 2 /SiC w (ZSC) as emittance agents, was applied on the surface of alumina fiber fabric (AFF). The reflecting effect of radiation heat from the high reflective agent enhanced the thermal insulation properties of the double-layer coating. In the wavelength range of 0.4–2.5 μm, the average emissivity of the ZSC coating was 0.83 and the average reflectivity of the T@S coating was 0.63. With continuous heating at 1400 °C for 10 min with a butane torch, the temperature on the backside of the T@S–ZSC-coated AFF remained relatively stable at 225 °C, which is notably decreased by 80 °C compared to that of the single-layer ZSC-coated AFF. The tensile strength of AFF with T@S–ZSC coating reached 35 MPa after being heat treated at 1200 °C. Moreover, the bonding strength between the coating and the AFF substrate was measured to be 0.15 MPa. The double-layer coating with high emissivity and reflectivity, along with a flexible AFF substrate, offers a promising solution for addressing the challenging of surface heat-dissipation in hypersonic vehicles.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Bioinspiration & Biomimetics
·
2021
·Vol. 17
·期 1
·015002
·
IF 2.956
Nifang Zhao,Anran Mao,Ziyu Shao,Hao Bai
Porous ceramic materials are attractive candidates for thermal insulation. However, effective ways to develop porous ceramics with high mechanical and thermal insulation performances are still lacking. Herein, an anisotropic porous silica ceramic with hierarchical architecture, i.e. long-range aligned lamellar layers composed of hollow silica spheres, was fabricated applying a facile bidirectional freezing method. Due to such anisotropic structure, the as-prepared porous silica ceramic displays low thermal conductivity across the layers and high compressive strength along the layers. Additionally, the anisotropic porous silica ceramic is fire-resistant. As a proof of concept, a mini-house was roofed with the anisotropic porous silica ceramic, showing that the indoor temperature could be stabilized against environmental temperature change, making this porous ceramic a promising candidate for energy efficient buildings and other industrial applications. Our study highlights the possibility of combining intrinsically exclusive properties in engineering materials through constructing biomimetic porous structures.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2021
·
IF 6.988
Sizhao Zhang,Junpeng He,Shixian Xiong,Qi Xiao,Yunyun Xiao,Feng Ding,Hui Ji,Zhouyuan Yang,Zhengquan Li
Biomass aerogels have received extensive attention due to their unique natural characteristics. However, biomass-based chitosan aerogels are often confronted with the traditional issue concerning a weak skeleton structure, namely, the corresponding huge shrinkage for chitosan aerogels in the stage from the final gel to the aerogel. Herein, we put forward a new approach to enhance chitosan aerogels by introducing natural biomaterial cellulose nanocrystal (CNC). CNC is applied to connect/cross-link chitosan chains to form its networking construction through supramolecular interaction/physical entanglement, eventually realizing the enhancement of the chitosan aerogel network structure. Chitosan aerogels modified with CNC exhibit a high specific surface area of 578.43 cm2 g–1, and the pore size distribution is in the range of 20–60 nm, which is smaller than the mean free path of gas molecules (69 nm), triggering a “no convection” effect. Hence, the gaseous heat transfer of chitosan aerogel is effectively suppressed. Chitosan aerogels with the addition of CNC show an excellent thermal insulation property (0.0272 W m-1 K-1 at ambient condition) and an enhanced compressive strength (0.13 MPa at a strain of 3%). This improvement method of chitosan aerogel in enhancing the skeleton structure aspect provides a new kind of idea for strengthening the nanoscale morphology structure of biomass aerogels.
研究领域:
材料科学
·
生物材料学
✓ 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）