ADVANCED MATERIALS
·
2024
·
IF 27.4
Hao Yan,Junsheng Wang,Cong Du,Zheng Li,Hua Yuan,Zhen Xu,Yeqiang Tan
The increasingly severe plastic pollution has urged an inevitable trend to develop biodegradable plastic products that can take over synthetic plastics. As one of the most abundant natural polymers, polysaccharides is an ideal candidate to substitute synthetic plastics. The rigidity of polysacchride chains principally allows high strength and stiffness of their materials, however, challenges the facile orientation in material processing. Here, a general hydrogen bond mediated plasticization strategy to regulate isotropic sodium alginate (SA) chains to highly ordered state is developed, and alginate plastics with high performances is fabricated. It is revealed that hydroxyl groups in glycerol modulate the viscoelasticity of SA solids by forming strong hydrogen bonds with SA chains, achieving a large stretchability at high solid content. Highly orientated alginate films exhibit superior tensile strength of 575 MPa and toughness of 60.7 MJ/m 3 , outperforming most regenerated biomass films. The high solid content and large stretchability mediated by strong hydrogen bonding ensure plastic molding of solid-like SA with high fidelity. This hydrogen bond mediated plasticity provides a facile but effective method to justify the high performances of polysaccharide-based plastics. This article is protected by copyright. All rights reserved
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinru He,Zhanpeng Zhang,Xuan Xuan,Tingyuan Tan,Jiaxuan Sun,Biao Wang,Yu Tian,Heng Chen
The application of chitosan in packaging has always been limited due to its brittle and hygroscopic nature. In this study, hydrophobic short-chain fatty acids (SCFAs) were utilized to modify chitosan to overcome this issue. For the first time, hydrophobic SCFAs, typically hexanoic acid and its homologs, were found to be able to dissolve chitosan in water as well as its hydrophilic analog. After water was removed through evaporation, hydrophobic SCFA-modified chitosan films were obtained. The results of mechanical testing and DSC analysis confirmed that these hydrophobic SCFAs could effectively plasticize the chitosan film. Moreover, water contact angle measurements revealed that the hydrophilicity of these plasticized chitosan films was significantly reduced. The findings from the moisture uptake experiments indicated that linear hydrophobic SCFAs reduced the hygroscopicity of the chitosan film. Additionally, the crystal structures, thermal and gas barrier properties, and antibacterial activities of these hydrophobic SCFA-modified films were systematically examined and compared with those of hydrophilic SCFA-modified chitosan. This study presents an innovative and practical method for modifying chitosan films by regulating the structure of the cosolvent, thereby facilitating the real-world application of chitosan-based food packaging materials.
研究领域:
材料科学
·
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Agriculture-Basel
·
2025
·Vol. 15
·期 11
·1177
·
IF 3.6
Tao Xue,Yi Li,Zimo Chen,Chao Kong,Biyun Feng,Changyin Zhu,Yinlong Zhang,Jianming Xue,Hu Cheng
To ensure agricultural safety and ecological security, it is crucial to effectively immobilize emerging organic pollutants, such as plasticizers, to prevent their migration in various environmental matrices. However, the ideal immobilization agent with the advantages of being environmentally friendly is very rare. In this study, low-cost and stable near-natural immobilization agents, char-derived artificial humic acids, CHAs, were proposed and prepared via hydrothermal humification (180 °C) and pyrolysis (300, 500, or 700 °C) of agroforestry biowaste. The resulting CHAs exhibit high purity (composed primarily of C (67.28–81.35%), O (6.65–21.64%), H (1.40–5.28%), and N (0.36–0.58%)) with remarkably low ash content (5.43–10.02%). Characterization revealed a compact structure with a limited porosity with small surface area (0.27–0.32 m2g−1) and pore volume (2.99–3.43 × 10−4cm3g−1). Notably, high-temperature pyrolysis induced consumption of oxygen-containing functional groups while promoting aromatic structure formation. The sorption behavior of diethyl phthalate, a representative plasticizer, on CHAs was well described by both Langmuir isotherm and pseudo-second-order kinetic models. The CHAs exhibited remarkable sorption performance for diethyl phthalate, with a maximum sorption capacity reaching 3345 mg kg−1as determined by the Langmuir model. The sorption of diethyl phthalate onto CHAs is mainly multi-layer sorption dominated by physical processes, mainly including pore filling, partitioning, hydrogen bonding, and π–π stacking. Mean sorption energies ranging from 2.56 to 4.99 × 10−3kJ mol−1indicate the predominance of physical sorption mechanisms. This study developed a method to convert the liquid by-product produced during hydrothermal humification of biowaste into stable near-natural and carbon-rich char materials, and the proposed materials show great promise in immobilizing pollutants from various environmental matrices.
研究领域:
环境科学
·
农业科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Fanghui Fan,Pengyu Xiang,Liqing Zhao
Lactose is a common component found in many foods and dairy products. In this study, the vibrational signatures in the crystalline structure of α -, β -, and α -lactose monohydrate were calculated based on quantum chemistry calculation (QCC), whilst the vibrational spectra in freeze-dried lactose equilibrated at various a w and pre-humidified amorphous lactose (0.33 a w ) stored from 25 to 95 °C were determined by using Raman and FT-IR spectroscopies. The vibrational signatures of crystalline lactose were affected by the presence of water according to QCC results. Water plasticization, involving water insertion, exposure of H-bonding sites, and structure disruption, was accelerated by storage temperature based on Raman and FT-IR spectra analysis. Raman spectra indicated that the crystal formation of lactose was affected by a w and storage temperature. Moreover, the spectral changes assigned in OH group provided useful information for determining the critical a w or temperature when T g -related molecular mobility occurred in lactose-containing products.
研究领域:
食品科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Shasha Zhao,Jiayou Liao,Danfeng Li,Xiaodong Wang,Nanwen Li
The novel gas separation membranes have been prepared by blending highly gas permeable polymer of intrinsic microporosity (PIM-1) and with Tröger's Base polymer (TB). Interestingly, it was found firstly that the PIM-1 polymer was miscible with Tröger's Base polymer in any proportion. It was assumed that the excellent compatibility between two polymers could be attributed to the interaction between CN group in PIM-1 and N atoms in Tröger's Base moieties, as confirmed by ATR-IR results. Thus, flexible, tough and transparent blending membranes (PIM/TB) at different compositions between PIM-1 and TB were obtained by solution casting. The SEM results further confirmed the homogeneous morphology of blending membranes, indicating the excellent compatibility between two polymers. The gas separation performance testing by the volume-constant method suggested that the PIM/TB blending membrane showed lower pure gas permeability but higher ideal permselectivity than that of the pristine PIM-1 membrane, probably due to the lower d-spacing of TB polymers from commercial aromatic diamine which has a rotatable bond as confirmed by XRD results. The highest ideal permselectivity of CO 2 /CH 4 was obtained for PIM/TB (6:4) membranes with CO 2 permeability of 2585Barrer. Moreover, the excellent anti-plasticization ability of CO 2 was observed for the blending membranes. The temperature dependence of gas separation and ideal permselectivity had also been observed for the membranes. The results suggested that the ideal permselectivity, particularly for the CO 2 /N 2 and CO 2 /CH 4 at lower temperature were much higher than that of the membrane at high temperature in spite of the decreasing permeability of CO 2 . The highest ideal permselectivity was achieved as high as 54.3 for CO 2 /N 2 at − 25 ℃ for PIM/TB(8:2) membrane. Thus, the strategy of blending Tröger's Base with PIM-1 showed a promising approach for high performance gas separation membrane.
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
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Xiaobai Li,Hongwei Ma,Peng Wang,Zhenchao Liu,Jinwu Peng,Wei Hu,Zhenhua Jiang,Baijun Liu,Michael D. Guiver
Phosphoric acid-doped polybenzimidazole (PA-PBI) used in high-temperature proton exchange membranes (HT-PEMs) frequently suffers from a serious loss of mechanical strength because of the “plasticizing effect” of the dopant acid. Conventional cross-linking approaches generally enhance membrane stability. However, acid doping levels (ADLs) and consequently proton conductivity inevitably decrease. This is due to the formation of more compact molecular structures and a reduced amount of functional imidazole units, caused by their consumption in introducing the cross-linker. To resolve the common problems of current PA-PBI-based HT-PEMs, herein, a highly acidophilic imidazole-rich cross-linked network with superior “antiplasticizing” ability is constructed based on a novel multifunctional cross-linker. This unique bischloro/bibenzimidazole (“A2B2-type”) molecular structure has extremely high reactivity, including “self-reaction” among the cross-linkers and “inter-reaction” between the cross-linker and PBI molecules. The resulting imidazole-rich cross-linked membranes exhibit the desired combination of high ADLs, high conductivity, outstanding dimensional–mechanical stability, and excellent fuel cell performance. In comparison to a corresponding linear PBI membrane, one membrane with a high content of the cross-linker of 30% has a 100 wt % increased acid uptake, a doubling in proton conductivity at 200 °C, and a maximum power density of 533 mW·cm–2 at 160 °C without humidification.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Dong Yang,Xinwen Peng,Linxin Zhong,Xuefei Cao,Wei Chen,Xueming Zhang,Shijie Liu,Runcang Sun
Epoxidized soybean oil (ESO), which is a biomass-derived resource, was first used as a novel plasticizer for ethyl cellulose (EC) film preparation. Surface morphologies, mechanical performances, thermal properties, oxygen and water vapor permeabilities of plasticized EC films were detected in detail to evaluate the plasticizing effect of ESO and explore the plastication mechanisms. Results showed that ESO was an effective plasticizer that outstripped conventional plasticizers, i.e. dibutyl phthalate (DBP) and triethyl citrate (TEC) in producing high-quality films. Especially, at plasticizer concentrations of 15–25%, ESO–EC films had preferable mechanical properties and better thermal stability, as well as non-flammability. In addition, the water vapor permeability of ESO–EC films was lower than that of traditional plasticized films. Their oxygen permeability was also remained in a low level. These outstanding performances were related to the relatively high molecular weight, hydrophobicity, chemical structure of ESO, and the intermolecular interactions between ESO and EC chains.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Meihong Liu,Shaoyi Lyu,Limin Peng,Liping Cai,Zhenhua Huang,Jianxiong Lyu
Furfuryl alcohol (FA) is an environmentally friendly chemical modifier that effectively improves the dimensional stability and mechanical properties of wood. The drawbacks of high brittleness and low toughness of furfurylated wood restrict its applications. Epoxidized soybean oil (ESO) is a biomass-derived resource and was added to FA solution as a novel plasticizer in this study. The FA–ESO solution was used to modify radiate pine wood obtained from fast-growing trees sourced from plantations. The microscopic morphology, chemical structure, and mechanical performance of the FA–ESO-modified wood were tested to evaluate the plasticizing effect of ESO on the performance of the modified wood and to assess the toughening mechanisms. It was found that ESO was an effective plasticizer that increased the toughness indictors of the furfurylated wood. When the plasticizer concentration was 20 wt %, the ultimate tensile stress and impact bending strength of the FA–ESO-modified wood were increased by 70% and 10%, respectively, compared to those of the furfurylated wood. In addition, the modified wood had a high density (approximately 910 kg/m3), good dimensional stability (antiswelling efficiency of approximately 82%), and superior mechanical properties (modulus of rupture, modulus of elasticity, and static hardness increased by 16%, 25%, and 18%, respectively). However, these exceptional performances were associated with the high molecular weight, good hydrophobicity, and proper chemical structure of ESO and the appropriate intermolecular interactions between ESO and FA resin chains. The hydrophobic FA resin and FA–ESO thermosets filled the wood cell walls and cell lumens, which improved the wood dimensional stability. Furthermore, the ring-opening polymerization reaction between FA and ESO and the long, flexible aliphatic chains of ESO increased the flexible properties of the FA resins and improved the toughness of the modified wood. The FA–ESO-modified wood had an excellent appearance and physical and mechanical properties comparable to those of tropical hardwood, which could expand the application of radiata pine to musical instruments.
研究领域:
材料科学
·
林学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Xiuling Chen,Zhiguang Zhang,Lei Wu,Xingchen Liu,Shan Xu,Johnson E. Efome,Xinghua Zhang,Nanwen Li
Certain polymers with very high free volume demonstrate a continuous network of interconnected void spaces due to the shape and rigidity of its macromolecular composition; as such, it becomes an intrinsic property for these polymers otherwise seen as polymers of intrinsic microporosity (PIM). Methylated polymers of intrinsic microporosity (PIM-M), bromoalkylated PIM (PIM-BM-x), and thermally self-cross-linked PIM-BM-x were designed and prepared for gas separation performance enhancements. The PIM-BM-x polymeric membranes demonstrated exceptional gas separation performance compared with PIM-M and surpassed the 2008 Robeson upper bound line, that is, the selectivities of PIM-BM-100 membrane for CO2/CH4 and O2/N2 were as high as 25.8 and 5.6, respectively. The gas permeability testing indicated that the permeability of CO2 and O2 for the cross-linked PIM-BM-70 was 48.3 and 11.1 barrer, respectively, while the selectivities of CO2/CH4 and O2/N2 were, respectively, 43.9 and 6.5 after self-cross-linking at 300 °C for 5 h. More importantly, the cross-linked membrane showed excellent antiplasticization ability with a plasticization pressure higher than 500 psi. This value is relatively greater than the pristine uncross-linked PIM-BM membrane (100 psi).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bowen Zhang,Junyi Gong,Keyan Wei,Shuai Yue,Cairong Jiang,Jianjun Ma
Aqueous tape calendering offers the advantage of a simple fabrication process, inexpensive equipment, and environmental friendliness. Polyvinyl alcohol (PVA), as a polymer, is a conventional binder for aqueous tape calendering. In this innovative work, we aim to achieve a suitable process for tape calendering, by studying mechanical properties of the PVA polymer film with a series of plasticizers . The results show that the elongation at break of the PVA film reaches a maximum of 828.26%, using a triple plasticizer of glycerol, polyethylene glycol (PEG) 200, and PEG 400. With an optimized ratio of the binder to the plasticizer, a YSZ sheet with a relative density of 98% and a conductivity of 0.043 S cm −1 at 800 °C is obtained by sintering at 1400 °C, demonstrating comparable performance to those of the YSZ electrolytes by dry pressing. SEM reveals that the sintered YSZ body is dense, and has no visible open and closed pores. The mechanical properties characterization of the PVA polymer film adopted in this paper has instructive significant instruction for tape calendering and tape casting methods.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Can Wang,Zhili Cai,Wei Xie,Yang Jiao,Lu Liu,Lili Gong,Qi-Wei Zhang,Xiaohua Ma,Hongjun Zhang,Shuangjiang Luo
Thermally induced chemical crosslinking has attracted substantial attention for fabricating plasticization resistant membranes due to the facile structure tunability that enables the construction of robust and well-defined architecture for gas separation. In this study, we report a new series of dual thermally crosslinkable polyimides derived from 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) containing two carboxyl groups, and a systematic investigation of the thermal treatment above and below T g demonstrated the decarboxylation-induced crosslinking. The dual thermally crosslinked membranes were insoluble in common organic solvents and maintained excellent mechanical properties . Due to the evolution of CO 2 and collapse of chain segments during thermal treatment, the crosslinked membranes exhibited hierarchical microcavity size distribution featuring ultra-micropore size in the range of 2.0–6.0 Å and micropore size in the range of 6.5–10.0 Å. Gas transport properties of the crosslinked membranes were feasibly tuned through the chemical compositions and thermal treatment procedures. For instance, the CO 2 permeability of crosslinked 6FDA-DAM 0.7 -TFMB 0.1 -DCB 0.2 increased almost three-fold with only a slight decrease in CO 2 /CH 4 selectivity. The crosslinked membranes also demonstrated superior plasticization resistance with mixed-gas feed pressure up to 40 bar and excellent low-temperature gas separation performance at −30 °C, making them attractive for aggressive gas separations.
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
MATERIALS AND STRUCTURES
·
2022
·Vol. 55
·期 7
·1-17
·
IF 4.285
Wang Xiaonan,Feng Decheng,Shi Xianming,Zhong Jing
Understanding the fundamental role of carbon nanomaterials is the key to unlocking their potential in enhancing the macroscopic engineering properties and performance of cementitious materials. There is significant debate over the hypothesis that carbon nanomaterials with high surface areas could promote cement hydration by providing nucleation sites (i.e., seeding effect). The seeding effect of carbon nanotubes (CNTs) for cement hydration has lacked direct experimental evidence, mainly due to the inability to directly observe the surface of CNTs after their full contact with the pore solution of cement and the complexity of hydration products at the nanoscale. Different from previous studies, we developed CNT sponge (CNTSP), a macro-scale assembly consisting of randomly oriented and entangled CNTs in three-dimension space, as the platform for discriminating the potential nucleating effect of CNTs. By design, the CNTSP features nano-sized interconnected pores that allow only the pore solution to penetrate through, thus separating the tricalcium silicate (C 3 S) particles and the pore solution of C 3 S in situ. The experimental results revealed that pristine and oxidized CNTs could barely act as seeding material for the nucleation of C 3 S hydration products. Relative to pristine CNT, oxidized CNT can promote the local formation of calcium hydroxide (CH) that is only loosely connected to the CNT, while depressing that of calcium silicate hydrate (C–S–H). The CNTSP was further employed as a platform to investigate the effects of superplasticizer on C 3 S hydration, revealing that the superplasticizer improves the CNT-hydrates binding. This work not only provides fundamental knowledge about the limited role of CNT in C 3 S hydration, but also demonstrates a novel experimental platform for investigating the interaction between carbon nanomaterials and cement hydration products.
研究领域:
材料科学
·
土木工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）