POLYMER
·
2021
·
IF 4.43
Bo-Wen Liu,Yu-Fei Lei,Xiao-Feng Liu,De-Ming Guo,Li Chen,Yu-Zhong Wang
Despite the excellent overall performance, the application of polyesters is severely restricted by their inherently high flammability . Although many gratifying results have been achieved through different fire-safety methods, customization is still needed for every specific polymer, thus a generally applicable method is highly desired. Herein, we developed an eco-friendly and general fire-safety method for semi-aromatic polyesters based on the “end-group-capturing” concept. The functional monomer was chemically incorporated into the main chains of a series of semi-aromatic polyesters with similar structures (i.e., polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT)), and the specific contribution of the fire-safety method was investigated comprehensively. The results showed that the fire safety of all the copolyesters were efficiently improved, while interestingly, the fire safety gradually declined with the increase of the methylene group numbers in their molecular chains. The reason behind this phenomenon was comprehensively studied by both theoretical calculation and experiments. The increasing cyclization tendency of the copolyesters derived from the increase of the methylene group numbers was proved to be responsible for the decrease of the fire safety. The successful application and in-depth mechanism revealed here provide theoretical supports for the development of novel fire-safety polymeric materials.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiajun Yu,Xiao Wang,Yan Wang,Xiaofeng Xie,Haijiao Xie,Nat Vorayos,Jing Sun
The removal of indoor/outdoor toluene by photocatalysis has drawn much attention due to its low energy consumption and easy availability. However, light inevitably generates heat, and pollutants desorb from catalysts as the temperature rises, which is not beneficial to degradation. Contrast to the frequently occurred phenomena, we firstly found that the adsorption capacity of UiO-66 (Zr) on toluene increased with increasing temperature as adsorption isotherms and in-situ Fourier transform infrared spectra (in-situ FTIR) showed. The optimum temperature was 30 °C. This stage in which adsorption capacity was positively correlated with temperature was called heating-induced adsorption, which achieved a toluene removal efficiency of 69.6 %. By density functional theory (DFT) calculations and changing the metal centers and organic ligands of UiO-66 (Zr) respectively, we disclosed that the heating-induced adsorption was mainly related to the π-π stacking interaction of MOF ligands and toluene. The analysis of samples before and after adsorption showed that the interaction between UiO-66 (Zr) and adsorbed toluene facilitated the charge transfer and prolonged the carrier lifetime, leading to the increase of hydroxyl radicals (•OH) in photocatalysis. Therefore, a synergistic effect between heating-induced adsorption and photocatalysis was proposed by analyzing the adsorption of toluene on UiO-66 (Zr) in detail. This work provided new viewpoint to understand the role of concomitant heat contributed to the adsorption and degradation of toluene during photocatalysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 22
·46326
·
IF 1.901
Weining Du,Yong Jin,Jiezhou Pan,Wuhou Fan,Shuangquan Lai,Xiaopeng Sun
Herein, we synthesized a series of polyurethane copolymers (PUs) with poly(1,4-butylene adipate) glycol as soft segment and 2,4-toluene diisocyanate as well as extenders including 1,4-butanediol and di(1-hydroxyethylene) diselenide as hard segment. The chemical structure, thermal property, crystallization behavior, shape memory, and self-healing performances of the PUs were systematically characterized by a series of experiments. It was found that the PU2 containing a higher diselenide component (∼33 mol %) exhibited both shape memory and self-healing behaviors under a moderate temperature (∼57 °C). Meanwhile, the PUs showed a good repeatability of shape memory function, and their fixity and recovery ratios were all above 90%. Additionally, the dynamic exchangeable feature of diselenide bonding endues the PUs chains with an acceptable reprocessability and self-healing performances, and the PU2 sample could be healed for five times by thermal treatment with the healing efficiencies above 70%. This work provides a heuristic perspective for the development of shape memory and self-healing materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46326.
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
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2022
·Vol. 34
·期 15
·154001
·
IF 2.745
Chunli Jiang,Qianqian Luo,Chunhua Luo,Hechun Lin,Hui Peng
We report here the synthesis of hybrid manganese halide crystals, (C4H7N2)MnCl3 · H2O and (C4H7N2)2MnCl4, by using the same organic ligand 2-methylimidazole. Upon heating treatment, the red-emissive (C4H7N2)MnCl3 · H2O crystal is structurally transformed into green-emissive (C4H7N2)2MnCl4 crystal in situ. The crystal structural analysis reveals that the [MnCl5 · H2O]3− octahedra chains decompose into mono [MnCl4]2− tetrahedra, accompanied by the departure of H2O molecules. Upon cooling in air or water vapor, the crystal structure and luminescence of (C4H7N2)2MnCl4 are transformed to those of (C4H7N2)MnCl3 · H2O. The in situ conversion of luminescence between (C4H7N2)MnCl3 · H2O and (C4H7N2)2MnCl4 provides new insight into the potential application of hybrid manganese halides.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 5
·4949-4964
·
IF 2.843
Alassod Abeer,Khalaji Mina Shahriari,Islam Syed Rashedul,Xu Guangbiao,Chaudary Aneeba,Alam Md. Kowsar,Alkhateeb Weaam
Creating inexpensive, highly efficient, and recyclable sponges for water remediation is significant but remains a big challenge. Herein, this research reported a facile method to fabricate cost-effective, environmentally friendly, and reusable sponges by blending Polypropylene with renewable resources (chitosan) with different ratios via thermal induce phase separation. The properties of obtained sponge were deeply evaluated in terms of the thermogravimetric analyzer, Fourier transforms infrared measurement, and scanning electron microscopy. Besides, wettability properties were analyzed. Newly sponges showed better thermal properties than Polypropylene with increased chitosan of more than 20 wt%. Chemical characterization confirmed successfully blending between components. Additionally, the wettability properties were influenced by increasing chitosan loading, where the water contact angle increased more than 130° due to increased surface roughness. These results revealed that new sponges are an ideal alternative sorbent for oil spill cleanup. The sorption ability increased with an increase of chitosan loading, where sponge PP40CH registered the highest sorption ability, more than 700%, with oil retention ability of more than 80%. The obtained sponge could be used as a promising filter screen for separating oils and organic liquid from contaminated water with more than 90% separation efficiency. Thus, thermal induce phase separation is an easy, eco-friendly, cost-effective, and practical way to produce a blend sponges with great potential usage prospects in purification and oil spill cleanup and make new sponges more competitive promising candidates than commercial absorbents.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiang Fan,Qi Wang,Haobo Jin,Yuanyuan Zhang,Yaqin Yang,Zhe Li,Guofeng Jin,Long Sheng
Pasteurization is necessary during the production of liquid egg whites (LEW), but the thermal effects in pasteurization could cause an unavoidable loss of foaming properties of LEW. This study intended to investigate the mechanism of pasteurization processing affects the foam performance of LEW. The foaming capacity (FC) of LEW deteriorated significantly (ΔFCmax = 72.33 %) and foaming stability (FS) increased slightly (ΔFSmax = 3.64 %) under different temperature–time combinations of pasteurization conditions ( P < 0.05). The increased turbidity and the decreased solubility together with the decreased absolute value of Zeta potential indicated the generation of thermally induced aggregates and the instability of the protein particles, Rheological characterization demonstrated improved viscoelasticity in pasteurization liquid egg whites (PLEW), explaining enhanced FS. The study revealed that loss in foaming properties of PLEW resulted from thermal-induced protein structural changes and aggregation, particularly affecting FC. This provided a theoretical reference for the production and processing of LEW products.
研究领域:
食品科学
·
蛋白质化学
✓ 已验证
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Yaping Liu,Chenxin Huang,Jiajie Wang,Xianchao Feng,Meihu Ma
Egg white proteins exhibit high thermal susceptibility to undesired aggregation, which limits their processing utility. In this study, the thermally regulated co-aggregation mechanism between ovotransferrin (OVT) and ovalbumin (OVA) was systematically investigated. Turbidity kinetics and particle size distribution results showed that the initial aggregation occurred at 55°C, induced by 4.3% disulfide cleavage and a 38.9% enrichment of β-sheet ( P < 0.05). Size exclusion chromatography results showed that this structural unfolding was mainly due to OVT molecules. The structurally activated OVT then specifically anchored the double cavities of OVA. Subsequently, upon heating at 60 - 65°C, the β-sheet reverted to the α-helix as detected by CD and FTIR spectroscopy, and the hydrophobic tyrosine and phenylalanine residues were reburied as detected by fluorescence spectroscopy, forming reversible metastable aggregates. At temperatures above 65°C, the larger heteroprotein complex (∼1.5 μm) emerged. ITC results showed that the co-aggregation was entropy-driven ( TΔS = +45.5 kJ/mol) with a stoichiometric ratio of 2:1 (OVT: OVA, n = 2.19 ± 0.12). Molecular docking and interaction force analyses revealed covalent disulfide bonds and multiple non-covalent bonds involved in this process. Notably, OVT acted as the aggregation initiator and governed the reverse aggregation, whereas OVA provided the structural backbone. These results provided a theoretical basis for the precise regulation of complex functional properties in the food industry.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jianyu Huang,Cai Ying,Xiaoqiong Li,Jian Kuang,Jianqiang Li,Tao Huang,Jinjun Li
In this experiment, the effects of different concentrations of cassava starch (CS) on the gel behavior of faba bean protein (FBP) were studied, focusing on the structural characteristics, gel characteristics and physical and chemical characteristics of the gel system. Specifically, with the increase of CS concentration from 4 % to 12 %, the morphology of the sample changed from fluid to gel solid. From the molecular structure, different concentrations of CS affected the secondary and tertiary structures of FBP protein, which made aromatic amino acids move to the surface of protein and promoted the transformation from α-helix to β-sheet. In addition, free sulfhydryl groups are converted into disulfide bonds, which increases the number of hydrogen bonds in the system. Microscopically, high temperature treatment leads to the cracking of CS and FBP structures, which enhances the noncovalent interactions between them, and forms a compact and smaller pore three-dimensional network structure, providing more channels for external moisture to transfer to the inside. From the gel characteristics, the water holding capacity, viscoelasticity and mechanical behavior of the composite gel were improved when the concentration of CS was 6 %-12 %. This work provides reference for the application of cassava starch-faba bean protein gel in specific food and medicine fields.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 121
·期 1
·e2316054120
·
IF 11.1
Mengfei Lu,Yu Du,Shicheng Yan,Tao Yu,Zhigang Zou
The sluggish electron transfer kinetics in electrode polarization driven oxygen evolution reaction (OER) result in big energy barriers of water electrolysis. Accelerating the electron transfer at the electrolyte/catalytic layer/catalyst bulk interfaces is an efficient way to improve electricity-to-hydrogen efficiency. Herein, the electron transfer at the Sr3Fe2O7@SrFeOOH bulk/catalytic layer interface is accelerated by heating to eliminate charge disproportionation from Fe4+ to Fe3+ and Fe5+ in Sr3Fe2O7, a physical effect to thermally stabilize high-spin Fe4+ (t2g3eg1), providing available orbitals as electron transfer channels without pairing energy. As a result of thermal-induced changes in electronic states via thermal comproportionation, a sudden increase in OER performances was achieved as heating to completely suppress charge disproportionation, breaking a linear Arrhenius relationship. The strategy of regulating electronic states by thermal field opens a broad avenue to overcome the electron transfer barriers in water splitting.
研究领域:
化学
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaohan Zheng,Bowen Zou,Wenqiang Cai,Xianbing Xu,Ming Du,Xiaokang Na,Beiwei Zhu,Chao Wu
Cod proteins (CPs) have potential applications in designing desirable gel-based products, and this study aimed to unravel their heat-induced aggregation pattern and further probe the roles in protein gels. SDS-PAGE analysis indicated that high-precipitation-coefficient aggregates (HPCAs) of CPs aggregates were composed of considerable polymers of myosin heavy chains and actin, and their low-precipitation-coefficient aggregates (LPCAs) contained myosin light chains and tropomyosin . Studies from correlation analysis between the structure and aggregation kinetics revealed that the generation of β-sheet and S S bonds were responsible for their spontaneous thermal aggregation induced by heating temperature and protein concentration, respectively. Additionally, as protein denaturation ratio increased, more and larger HPCAs were formed, which was evidenced driving the network formation of protein gels and resulting in higher storage modulus (G') values. These novel findings may be applicable to other animal proteins for better tailoring the manufacturing of muscle gel-based products.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Xiyang Zeng,Tao Chen,Yonggui Liu,Ting Zhang,Li Wang
In recent years, self-healing materials have attracted extensive attentions, however, the low elasticity have limited their applications, and it is difficult to track their healing process on macroscale. Herein covalently crosslinked polyurethane (PU) composite networks were developed with thermal induced self-healing capability and ultraviolet (UV) initiated fluorescence effect, which were synthesized by polytetrahydrofuran glycol (PTMG) as soft segment, hexamethylene diisocyanate (HDI) as hard segment, incorporating with blue phosphate (BP) of SrAl 2 O 4 doped with Eu 2+ , Dy 3+ . The physio chemical properties and self-healing process of polyurethane were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), atomic force microscope (AFM), optical microscope (OM), dynamic mechanical analysis (DMA) and tensile test. The results showed that the network materials were successfully developed with high elastic tensile properties. After healing at 60 °C for one hour, the PU network demonstrated a high healing efficiency and elongation at break. Moreover, the obtained hybrid networks emitted an intense blue light under UV with high fluorescent intensity to track healing process. Additionally, the synergistic effect of transesterification of dynamic hydrogen bond provided the composite networks reproducibility for recycling use. This self-healing polyester material shows promising applications in the fields of diagnostic healing and optoelectronic components.
研究领域:
材料科学
·
化学工程
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Jiwang Chen,Ni Yao,Tingliang Wang,Jiajia Wu,Mingle Ding,Xinxin Zhang,Shichao Zhang,Sam S. Yoon,Bin Ding
To meet the increasing environmental requirements, it is urgent and inevitable for high-performance waterproof and breathable membranes to be fluorine-free. However, developing these membranes faces significant challenges in achieving high water repellency while maintaining desirable water vapor permeability. Herein, we present a high-performance fluorine-free waterproof and breathable membrane using electrospinning technology and a thermally induced coating-crosslinking method. The prepared nanofibrous membrane has low surface energy and crosslinked fiber networks due to hydrophobic group grafting and heat treatment. Benefiting from its microstructure and surface properties, the fluorine-free nanofibrous membrane exhibits excellent hydrophobicity (water contact angle of >130°), desirable pore structure and mechanical strength. Furthermore, the obtained non-fluorinated membrane exhibits excellent water pressure resistance of 95.27 kPa and water vapor permeability of 7.41 kg m −2 d −1 . Meanwhile, the crosslinking agent enhances the bond between the non-fluorinated hydrophobic modifier and the substrate, increasing the stability and robustness of the membrane. This study provides guidance for designing and preparing environmentally friendly waterproof and breathable membranes, with extensive application prospects in outdoor sports, healthcare protection and building exteriors.
研究领域:
材料科学
·
环境科学
✓ 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）