INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 9
·7580-7590
·
IF 3.741
Jiale Mao,Shuang Wang,Lei Zhang,Yu Chen,Yonghong Cheng
Summary Energy storage media is the kernel for the rapidly developing new energy systems, while it remains a challenge to achieve admirable service capability at high temperature. This manuscript purposes crosslinking as an effective method to address the issue. The epoxy is innovatively studied as energy storage media in this research. We figure out that crosslinking density is a critical factor to determine its energy storage performance. With adequate crosslinking, attractive energy storage density/efficiency (6.9 J/cm 3 /90%@room temperature; 1.2 J/cm 3 /90% and 1.7 J/cm 3 /75%@100°C) can be achieved. However, excessive crosslinking density and lack of crosslinking point are found to induce obvious energy storage performance decaying at high electric field and high temperature, respectively. This manuscript demonstrates that the general epoxy materials can be used as energy storage media and concludes that proper crosslinking can improve the energy storage performance of polymers, which provides directions for future research on high-temperature energy storage films.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Ai Ping Zhang,Wei Zhao,Xin Kang Li,Jun Bian,Ke Yang Ni,Ke Cheng Yang,Hai Lan Lin,Dai Qiang Chen
The main-chain benzoxazine (BA-ddm) and diamine-type benzoxazine (Ph-hda) were prepared by solution method, and a series of copolymers were prepared by mixing them at various mass ratios. Second, copolymer coatings (P(PB)) were prepared on the surface of the tinplate by dip coating and heat curing. The results of FTIR and 1 HNMR showed that the benzoxazine copolymer coating was successfully prepared. DSC test results showed that the copolymerization of two benzoxazine oligomers was promoted by the introduction of BA-ddm containing phenolic hydroxyl groups. The introduction of Ph-hda containing a long aliphatic chain provided the copolymer coatings with good hydrophobicity, as verified by the hydrophilicity and hydrophobicity tests. When the mass ratio of BA-ddm to Ph-hda was 1:19, the water contact angle and water absorption of P(PB5) were 100.1 0 % and 0.56%, respectively. The results of dynamic polarization curves and electrochemical impedance spectroscopy (EIS) indicated that different copolymer coatings had good corrosion resistance. Among them, the P(PB5) coating exhibited the best anti-corrosion performance, with a corrosion current of 5.15 × 10 −8 A cm −2 , a protection efficiency of 99.23%, and an impedance modulus of 1.78 × 10 7 Ω cm 2 at 0.01 Hz, which was nearly 5 orders of magnitude higher than the impedance modulus of the blank tinplate.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 20
·2855-2865
·
IF 3.046
Muchen Lu,Yihu Song,Qiang Zheng,Wanjie Wang
Copper chloride (CuCl 2 ) is used in sulfur-cured natural rubber (NR) to regulate disulfide exchange reaction in self-healing process while factors influencing the healing capability remain unclear. Herein CuCl 2 and other additives including zinc oxide and sulfur are used to mediate self-healing efficiency of NR vulcanizates. For revealing the role of proteins and phospholipids in NR, the mediated self-healing capability is compared with sulfur-cured isoprene rubber (IR) vulcanizates. The results reveal that CuCl 2 interferes rheological responses and vulcanization dynamics in both rubbers, and it causes intermolecular disassociation in NR gums. As self-healing capability is closely related to crosslinking density, formulation is adjusted to balance healing efficiency and tensile strength. Healing efficiency of around 70% and the highest tensile strength of about 6 MPa are achieved at crosslinking density about 70 mol/m 3 when vulcanizates are healed at 140°C for 30 min. Graphical
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Bin Gou,Jiangang Zhou,Huasong Xu,Hangchuan Cai,An Zhong,Daoming Zhang,Licheng Li,Rui Wang,Congzhen Xie
Epoxy resin polymers are characteristic of outstanding mechanical and insulating performances, establishing them as critical insulating components in modern electronic devices and power systems. Bio-based polyphenol organics, a substitute for petroleum-based anhydride to cure epoxy resins, can restrict the waste of non-recyclable petroleum resources, meeting the current demand for sustainable development. However, due to rapidly developing industrial demands, such epoxy polymers using bio-based organics as curing agents need further exploration to realize excellent comprehensive properties. Herein, epoxy resin with significantly high crosslink density and few intermolecular defects has been successfully prepared using 1,4-butanediol diglycidyl ether-modified tannic acid as the green crosslinker. The most outstanding comprehensive properties have been realized by adjusting the mass ratio of 1,4-butanediol diglycidyl ether to bisphenol-A epoxy resin to 3: 10. Specifically, the tensile strength , elongation at break, breakdown strength and intrinsic thermal conductivity of tannic acid cross-linked epoxy resin reached 67.6 MPa, 5.4%, 29.8 kV/mm and 0.59 W/(m·K), respectively, globally higher compared with epoxy/anhydride system, which is attributed to the tighter molecular structure, fewer molecular entanglements and less internal defects. Therefore, this work provides a simple and feasible method for preparing tannic acid cross-linked epoxy resin polymers with excellent comprehensive properties, offering potential application value.
研究领域:
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xibing Zhan,Huijuan Liu,Junying Zhang
In this study, vinyl-terminated polysiloxane (abbreviated VISR) and allyl-terminated polysiloxane (abbreviated ALSR) were synthesized and characterized. The curing behaviors and viscoelastic and thermal properties of VISR/PHSR and ALSR/PHSR were comparatively investigated. DSC and in situ FT-IR spectroscopy can be adopted to study the influence of molecular structures on reactivity. The results prove that ALSR/PHSR shows higher reactivity including a higher reaction rate constant and cure degree than VISR/PHSR. Moreover, it is found that the Šesták-Berggren equation can adequately depict the cure kinetic model of silicone resin in hydrosilylation comparing the calculated results with experimental data. Additionally, DMA exhibits that the glass transition temperature and cross-linking density of ALSR/PHSR are much lower than those of VISR/PHSR, TGA data reveal that they have similar thermal stability as well as high char yield, and the decomposition energy ranges from 100 to 270 kJ/mol with increment of degree of mass conversion (αd) (αd = 0.15–0.85).
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Shan Jiang,Li Liu
Poly(hydroxyurethane)s (PHUs) are regarded as one of the most promising nonisocyanate-based polyurethanes, with their improved performance attracting widespread attention. As a type of PHU, poly(hydroxyurethane-urea)s (PHUUs) can effectively broaden the performance range of PHUs, demonstrating high potential for various applications. In this study, cross-linked PHUU elastomers were prepared through aminolysis of cyclic carbonate, using carbon dioxide-based tricyclic carbonate of glycerol (GTC) as the cross-linker, and carbon dioxide-based amino-terminal polyurea oligomer (TTD*/HMDA*) as the chain extender. The cross-linking density and thermal and mechanical properties of the PHUU elastomers could be tailored by controlling the feed ratio of GTC or TTD*/HMDA*. The reprocessability of the PHUUs was also investigated. To further optimize the properties of PHUUs, modified PHUUs with improved cross-linking density were prepared utilizing pendant hydroxyl groups as cross-linking points. Methacrylic acid (MA) was grafted onto the hydroxyl group, and simultaneously, a dense cross-linking network of the modified PHUUs was formed through the polymerization of MA. With the introduction of MA, modified PHUUs showed an increased glass transition temperature and adjustable mechanical properties. The tensile strength, Young’s modulus, and elongation at break of modified PHUUs were in the ranges of 1.19–15.00 MPa, 0.69–95.65 MPa, and 138–687%, respectively. Modified PHUUs exhibited significantly improved tensile strength and Young’s modulus than those of PHUUs. This work provides an option for preparing high-performance or functionalized PHUUs.
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
Journal of Science-Advanced Materials and Devices
·
2024
·
IF 6.7
Hang Ning,Shaoyun Chen,Yan'e Liu,Bo Qu,Yanyu Zheng,Xiaoying Liu,Wenjie Li,Rui Wang,Nairong Chen,Dongxian Zhuo
High-performance resins that can withstand temperature changes are required to expand the application potential of additive manufacturing (3D printing) in response to increasing demand from various fields. In this study, a novel 3D-printing polybutadiene polyurethane acrylate photosensitive resin named HTPBMA was prepared by mixing hydroxyl-terminated polybutadiene (HTPB) as the base material with other active diluent monomers and photoinitiators, including hydroxypropyl methacrylate (HPMA). The resulting resins exhibited good rheological properties and rapid photocuring ability, depending on the type and proportion of diluent monomer. In particular, the tensile strength and elongation at break of the sample with a 65:35 HTPBMA:HPMA ratio at −25 °C were 32.9 MPa and 246.1%, respectively, being 2.13 and 1.58 times the values at room temperature, respectively. These results indicate that HTPBMA exhibits excellent low-temperature performance and physical properties. The enhancement mechanism can likely be attributed to introducing of a flexible carbon chain as well as increased cross-linking density (υ e ). These advantages suggest that the novel photosensitive resin designed and prepared in this study can be used for photocuring 3D printing and maintain excellent performance under extreme climatic conditions. Thus, the proposed HTPBMA has broad application prospects in aerospace and materials science, especially in shoe materials and tires.
研究领域:
材料科学
·
化学工程
·
航空航天
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Yong Sun,Anqi Yu,Yuntao Liang,Gang Wang,Shuanglin Song,Wei Lu,Zhenglong He,Shaocong Meng
In order to understand the evolution of the structure–property relationship between the crosslink density and mechanical properties of polyurethane-urea/sodium silicate (PU/SS) hybrid composites, a series of PU/SS composites with 2.5 wt% organofunctional silanes and pure PU/SS composites are investigated at different curing time. Mechanical properties, the fracture surface morphology, and thermo-mechanical properties of these PU/SS composites are characterized by electron omnipotence experiment machine, scanning electron microscope, and dynamic mechanical analysis (DMA), respectively. The mechanical test results show the strength and fracture toughness of the PU/SS composites first increase and then stabilize during cure, and the modification leads to PU/SS composites with significantly higher mechanical properties. Further, the morphology of fractured samples also reveals that the longer curing time and the modification of the PU/SS composites means a higher curing degree. Moreover, the increase in the crosslink density calculated from the DMA tests quantitatively confirmed the positive influence of the curing time and the modification in enhancing mechanical properties. In addition, it is also found that the mechanical properties of the PU/SS composites not only depend on the crosslink density but also on the well-dispersed hybrid PU/SS system.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 16
·
IF 1.768
Zhiyong Lv,Chonggang Wu,Jing Li,Xiao Fang,Dongdong Yu,Huchuan Qin,Peng Yu,Xuhuang Chen
A new high-ultraviolet (UV)-transmission silicone-resin polymeric material was prepared via curing during hydrosilylation of tetramethyltetravinylcyclotetrasiloxane with tetramethylcyclotetrasiloxane by a liquid-surface supernatant method, using a stepwise heating program to avoid spontaneous combustion of the reaction mixture. The relationships were investigated in detail between reactive groups, cross-linking density, mechanical and UV-transmission properties. For this purpose, UV transmittance and dynamic mechanical properties, respectively, of the silicone resin were measured with UV–visible spectrophotometry and dynamic mechanical thermal analysis. In addition, surface roughness was evaluated with an atomic force microscope as well as an interferometer. The curing process was monitored by Fourier transform infrared spectroscopy and rotational rheometry. The cyclic silicone oils were compared with linear ones in structure and product properties. The results indicated that stepwise temperature control during curing process was particularly indispensible due to the presence of active Si H bonds, and that the silicone resin of high modulus, high UV transmittance (92.7%) and low surface-roughness was largely homogeneous in cross-linking points distribution. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43308.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Zixuan Lei,Jian Wang,Chi Zhang,Qianqiu Wu,Jian Li,Yuhong Liu
Simultaneously improving mechanical strength and toughness of thermosetting polymer nanocomposites remains a great challenge even though massive efforts have been made by controlling the aggregation and interface interaction of nanoparticles . In fact, crosslinking inhomogeneity and crosslinking density of thermosetting polymer nanocomposites can also profoundly affect the competing mechanical properties. Due to their conflicting influence on the toughness and strength of thermosetting polymer nanocomposites, the difficulty lies in how to coordinate the influence effectively. In this work, a mechanically tough and strong novolac phenolic nanocomposites (ESNH) were successfully constructed by introducing a reactive core-shell POSS with nanosilica as core and epoxy-polyhedral oligomeric silsesquioxane as shell (SiO 2 @EPOSS) (ES). Via controlling the quantity and the size of self-polymerized ES phase domain, the crosslinking inhomogeneity and crosslinking density of ESNH can be diversely tuned. Especially for 3%ESNH-3%, remarkably enhanced tensile properties and fracture toughness were realized. The self-polymerized ES phase domain with relatively small quantity and size was homogeneously grafted in phenolic networks, which could pin microstructural interfaces and junct nodular domains of phenolic networks, synergistically improving the crosslinking inhomogeneity and crosslinking density. Therefore, the moderately self-polymerized ES phase domain in the phenolic networks was remarkably contributed to coordinating the performance between the fracture toughness and tensile property. This study provides a novel and efficient envision toward simultaneously improving the toughness and strength of thermosetting polymer nanocomposites via tuning their curing behavior and the corresponding microstructure.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 33
·1701962
·
IF 12.124
Xin Peng,Tianqi Liu,Qin Zhang,Cong Shang,Qing-Wen Bai,Huiliang Wang
Convenient patterning and precisely programmable shape deformations are crucial for the practical applications of shape deformable hydrogels. Here, a facile and versatile computer-assisted ion inkjet printing technique is described that enables the direct printing of batched, very complicated patterns, especially those with well-defined, programmable variation in cross-linking densities, on one or both surfaces of a large-sized hydrogel sample. A mechanically strong hydrogel containing poly(sodium acrylate) is first prepared, and then digital patterns are printed onto the hydrogel surfaces by using a commercial inkjet printer and an aqueous ferric solution. The complexation between the polyelectrolyte and ferric ions increases the cross-linking density of the printed regions, and hence the gel sample can undergo shape deformation upon swelling/deswelling. The deformation rates and degrees of the hydrogels can be conveniently adjusted by changing the printing times or the different/gradient grayscale distribution of designed patterns. By printing appropriate patterns on one or both surfaces of the hydrogel sheets, many complex 3D shapes are obtained from shape deformations upon swelling/deswelling, such as cylindrical shell and forsythia flower (patterns on one surface), ding (patterns on both surfaces), blooming flower (different/gradient grayscale distributive patterns on one surface), and non-Euclidean plates (different/gradient grayscale distributive patterns on both surfaces).
研究领域:
材料科学
·
生物工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 14
·46099
·
IF 1.86
Hui Zhang,Hao Yang,Baoqing Shentu,Songjun Chen,Ming Chen
The ultraviolet (UV)-C ageing behavior of silicone rubber (SiR) incorporated with titanium dioxide nanoparticles (nano-TiO 2 ) was studied under UV-C radiation. The SiR incorporated with nano-TiO 2 displayed excellent physical properties when exposed to UV-C radiation. With the increase of the ageing time, the SiR with nano-TiO 2 showed no significant change in crosslinking density and Shore A hardness. Moreover, compared with the SiR without nano-TiO 2 , the SiR incorporated with nano-TiO 2 also exhibited high retention ratio in tensile properties, especially elongation at break. It was found that nano-TiO 2 was a good ultraviolet light stabilizer during the UV ageing process of SiR and the optimum content of nano-TiO 2 was 2 phr. The results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed the appearance of O H and CO and the decrease of the intensity of SiC 2 O 2 in SiR samples during the process of UV-C ageing. Based on these results, a possible UV ageing mechanism of SiR could be proposed. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46099.
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
危险品化学品经营许可证（带存储）