JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53563
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IF 3.057
Yan Wang,Zhancheng Zhang,Yaoming Zhang,Xianqiang Pei,Tingmei Wang,Qihua Wang
To make full use of the renewability of polylactide (PLA) and natural Eucommia ulmoides gum (EUG), novel fully sustainable thermal plastic vulcanizates (TPVs) with high toughness were developed via dynamic vulcanization technique based on modified EUG (referred to as EUG-GMA). The latter greatly improved the toughness of PLA and the mechanism was discussed with respect to micro structure analysis. Aiming at providing theoretical guidance for PLA/EUG-GMA TPVs in scratch related applications, the scratch behavior of TPVs with different EUG-GMA content was studied in single-pass and multiple-pass scratching mode, after which the tribological mechanisms were discussed based on worn surface morphology and contact area analysis. It is revealed that the promoted interfacial adhesion due to in-situ compatibilization and the co-continuous phase structure of PLA/EUG-GMA TPVs played crucial roles in enhancing the TPVs' toughness. In addition to tribo-conditions, the above mentioned interfacial performance was also responsible for the variation of scratch behavior of different TPVs. It is expected that the present study would open up a new route of manufacturing sustainable composites combined with scratch resistance and toughness.
研究领域:
材料科学
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可持续发展
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Chunxiang Lin,Hao Yi,Ling Chen,Yifan Liu,Xiaoxia Ye,Yuancai Lv,Minghua Liu
A biphasic solvent system consisting of ionic liquids (IL) and petroleum ethers was applied in the extraction of Eucommia ulmoides gum (EUG) from pericarp . Effects of IL and extraction parameters on the yield and purity of EUG were investigated. The results showed that the addition of IL could enhance the yield and purity of EUG extracted from pericarp comparing with the traditional alike pretreatment method. FTIR, XRD and 1 H NMR characterization conformed the chemical structure of EUG. DSC analysis reviewed the partial destruction of crystal structure and the disappearance of β-crystal phase of EUG extracted by biphasic solvent system, resulting in the decrease of the melting point and increase of glass transition temperature. Moreover, the extracted EUG exhibited high tensile strength of 27.68 MPa, excellent elongation at break of 1069%, and thus high toughness of 181.45 MJ∙m −3 . Additionally, the excellent reusability of IL and petroleum ethers showed the extraction method of the biphasic solvent system promise as a feasible method to replace the traditional alkali pretreatment.
研究领域:
植物学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zhonglei Kang,Hongli Hu,Hiroshi Uyama,Bo-xing Zhang
Development of materials based on Eucommia ulmoides gum (EUG) has been receiving increasing interest because of its unique properties and abundant natural sources. In this study, EUG monolithic materials with tunable and interconnected pore structures were prepared via modified Pickering high internal phase emulsion. The effects of dispersed phase volume fractions, cross-linkers, and stabilizers on structures and properties of EUG monoliths were systematically investigated. The usage of a surfactant (span 80) was suppressed by the introduction of particles including graphene, cellulose nanocrystals (CNCs), and carbon nanotubes (CNTs). Moreover, the pyrolyzed sample derived from the CNT-stabilized EUG monolith exhibited excellent electromagnetic shield performance. This study demonstrates a method to prepare porous monolithic EUG materials, which may have potential applications for thermal insulation and electromagnetic shielding materials.
研究领域:
材料科学
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植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2025
·
IF 3.2
Zhang Chuhan,Qin Lijun
AimsTo determine the optimum conditions for extracting Eucommia ulmoides gum (EUG) from Eucommia ulmoides leaves during fermentation by Coprinellus disseminatus. At the same time, the EUG characteristics were characterized.Methods and resultsThe ability of C. disseminatus to secrete degrading enzymes, including enzyme activity and lignocellulose content, was observed by culturing C. disseminatus on a medium with different formulations. Based on the optimal formula, the fermentation conditions were determined by an orthogonal test and EUG was extracted. After that, the characteristic parameters of EUG were determined by FT-IR, 1H-NMR, SEM, POM, DSC, XRD and GPC. The results showed that the lignin and hemicellulose contents in Eucommia leaves decreased significantly with the increase of fermentation days, and C. disseminatus mediated fermentation had an obvious damage effect on the tissue of Eucommia leaves. At the same time, At the same time, xylan can be used as an initiator to induce the expression of degradation-related enzymes. The extraction yield of EUG from Eucommia ulmoides leaves after fermentation was 3.06%, which was significantly improved. The optimum fermentation conditions were 4% inoculum, 28°C fermentation temperature, and pH = 5. The results of infrared FT-IR and 1H-NMR showed that the extract had typical characteristics of EUG, and the surface and quenching part of the EUG were smooth, as observed by SEM. In addition, DSC and XRD analysis show that there are two crystal types, α and β, in the crystallization process of molten EUG. The main crystallization type of EUG extracted from fermented leaves was β type.ConclusionThe ability of C. disseminatus to produce degrading enzymes can effectively improve the extraction rate of EUG under optimal fermentation process. The method can maintain the integrity of gutta-percha better. EUG has the characteristics of good crystallinity, many β crystal types and high molecular weight.
研究领域:
生物技术
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生物化学
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材料科学
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植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 12
·1659-1667
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IF 2.99
Yan Wang,Xianqiang Pei,Lin Xia,Zhancheng Zhang,Qihua Wang,Tingmei Wang
In this paper, we present an efficient and green extraction process for Eucommia ulmoides gum (EUG) to solve the tricky problems in separation and precipitation, providing a new idea for the industrialization of EUG extraction. Subsequently, the obtained EUG was blended with low density polyethylene (LDPE) and zinc methacrylate (ZDMA) to fabricate novel shape memory composites with both covalent and ionic crosslinking networks. It was found that the improvement in mechanical performance and enhancement in shape recovery ability of the EUG/LDPE/ZDMA composites was attributable to the Zn 2+ -based ionic crosslinks. The EUG/LDPE/ZDMA shape memory composites could be candidates in the production of medical fixing materials, hot-shrinkable tubes and packaging products. © 2021 Society of Chemical Industry
研究领域:
材料科学
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生物材料
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绿色化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zhaopeng Hu,Xin Jiang,Benteng Liu,Qiao Li,Hongda Meng,Yihu Song,Yongzhong Bao,Qiang Zheng
Co-vulcanization of natural rubber (NR) and high-moduli Eucommia ulmoides gum (EUG) is promising while the reduction in crystallinity of crosslinked EUG is adverse for developing high-performance materials. Proposed herein is a novel method to prepare high-strength and high-stretchability NR/EUG vulcanizates with rapid vulcanization of EUG into slightly crosslinked particles, followed by further vulcanization of NR to form crosslinked matrix network. Deep eutectic solvents (DESs) are employed to facilitate the vulcanization of EUG during its blending with NR. The two-step vulcanization results in vulcanizates exhibiting superior mechanical properties under shear, tensile, and compressive conditions, significantly exceeding those of vulcanizates prepared by traditional processing methods. The reinforcement mechanism is elucidated by controlling thermomechanical coupling conditions and is supported by comprehensive structural characterizations. It is suggested that the EUG crystalline regions, maintained through the special processing method, work in conjunction with the stress-induced crystallization of the matrix to enhance the vulcanizates, nearly doubling the deformation stress at 800 % strain. The crystalline regions can mediate the deformation stress during shear and compression and weaken nonlinear rheological behavior. The established structure-performance relationship is guidable for preparing high-performance NR/EUG blend vulcanizates.
研究领域:
材料科学
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聚合物科学
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流变学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Hongxin He,Xi Zhuang,Hao Yi,Yifan Liu,Yuancai Lv,Xiaoxia Ye,Liang Song,Chunxiang Lin,Minghua Liu
Eucommia ulmoides residue mainly contains lignocellulose and Eucommia ulmoides gum (EUG), the comprehensive utilization of these components could not only help waste disposal but also support the sustainable development. Lignocellulose nanofibrils (E-LCNFs) with varying lignin contents were isolated from the residue waste produced from EUG extraction from Eucommia ulmoides pericarp using p -toluene sulfonic acid hydrolysis. The obtained E-LCNFs were then used as reinforcement to fabricate EUG/E-LCNFs composite films, which were then characterized and the wettability, mechanical and water vapor barrier properties were tested. Meanwhile, effect of lignin content on the performance of the composite films was also discussed. The results showed that limited incorporation of E-LCNFs as well as the presence of lignin greatly improved the water contact angle (WCA), mechanical properties and vapor barrier property of the composite films. Compared with the pure EUG film, the composite film incorporated 4 % E-LCNFs with lignin content of 17.53 % presented WCA of 99.9°, elongation at break of 422.5 % and water vapor permeability (WVP) values of 0.29 × 10 −9 g/m/h/Pa at RH of 75 %. Additionally, strawberry preservation experiments demonstrated that the EUG/E-LCNFs composite films could effectively extend the shelf life by reducing weight loss, enabling it to be a desirable alternative to traditional petroleum-based food packaging materials.
研究领域:
材料科学
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高分子科学
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纳米技术
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食品包装
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植物生物技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Xin Qi,Yingdong Zhang,Liqun Zhang,Dongmei Yue
The regulation of polymer properties based on stereochemistry is essential but rarely studied. Inspired by the isomerization of unsaturated phospholipids in cell membranes, we report a novel method of preparing stereocontrolled polymer using sustainable Eucommia ulmoides gum (EUG) as a raw material. Under the catalysis of thiyl radical, EUG with 100% trans-1,4-polyisoprene structure isomerized to cis-configuration partly in a controllable way, thus achieving the rational modulate of thermomechanical properties. The isomerization mechanism was verified by density functional theoretical calculation. The isomerized EUG (IEUG) with low cis content (≤8.7%) can serve as plastics or shape memory materials, while high cis content (≥10.7%) IEUG transferred into elastomer materials. Especially for IEUG-10.7%, its vulcanizates without filler reinforcement shows high tensile strength (15.5 MPa) and elasticity (97%) comparable to natural rubber due to its strain-induced crystallization ability, which has the potential to be the second natural rubber. This paper provides a new strategy for stereocontrol of polymer properties, and the prepared materials have broad application prospects in the intelligent sensing and rubber industry.
研究领域:
聚合物科学
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材料科学
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可持续化学
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仿生学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 45
·25399-25407
·
IF 12.732
Xin Qi,Jichuan Zhang,Liqun Zhang,Dongmei Yue
Fabricating materials with a combination of high toughness, and self-healing, shape memory and reprocessing properties, especially derived from renewable precursors, remains a challenge. Herein, we demonstrate a simple strategy to prepare a multifunctional elastomer based on a semi-interpenetrating dynamic network (semi-IDN) by using sustainable Eucommia ulmoides gum (EUG) as a raw material. The elastomer possessed high stretchability (∼876%) and high tensile strength (∼12.1 MPa) as well as good self-healing, solid plasticity and shape memory properties. Moreover, it can not only be reprocessed by hot pressing (tensile strength remains 92% after three times of reprocessing), but can also be recycled by dissolving with little effect on the structure and properties. In addition, a flexible electronic device is prepared by spraying hydroxylated multiwalled carbon nanotubes (MWCNTs-OH) on its surface, which exhibited good self-healing of electrical conductivity after damage. The semi-IDN concept provides a new pathway to prepare reprocessed materials, and the as-prepared elastomers have broad application prospects in new generation green rubber and flexible wearable devices.
研究领域:
材料科学
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可持续材料
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聚合物科学
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柔性电子
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xin Qi,Chaolun Pan,Liqun Zhang,Dongmei Yue
Shape memory polymers (SMPs) have attracted wide attention over the past few decades due to their fantastic applications in modern life. Nevertheless, excellent self-healing properties, recyclability, solid-state plasticity, and reversible shape-switching ability are necessary but can rarely be satisfied in one material. Herein, we report multifunctional SMPs by constructing a dynamic boronic ester bond cross-linking network using sustainable Eucommia ulmoides gum as a raw material. Thanks to the crystallization and wide melting temperature range, these kinds of SMPs have thermal-triggered one-way shape memory performance and show two-way shape memory properties, whether under constant stress or stress-free conditions. Owing to the dynamic nature of the boronic ester bond, it exhibits good self-healing properties (near 100% at 80 °C), shape reconfigurability, and chemical recyclability. In addition, by incorporating multiwalled carbon nanotubes, the formed composite is responsive to 808 nm near-infrared light. Its applications are further exploited, including photoresponsive actuators, vascular stents, and light-driven switches. This paper provides a simple way for fabricating multifunctional SMPs, and the as-prepared materials have potential applications in diverse fields, such as biomedicine, intelligent sensing, and soft robotics.
研究领域:
材料科学
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聚合物化学
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生物医学工程
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纳米技术
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机器人技术
✓ 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）