Polymers
·
2020
·Vol. 12
·期 11
·2763
·
IF 3.426
Munir Hussain,Sohail Yasin,Hafeezullah Memon,Zhiyun Li,Xinpeng Fan,Muhammad Adnan Akram,Wanjie Wang,Yihu Song,Qiang Zheng
In this paper we designed greener rubber nanocomposites exhibiting high crosslinking density, and excellent mechanical and thermal properties, with a potential application in technical fields including high-strength and heat-resistance products. Herein 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) ionic liquid was combined with silane coupling agent to formulate the nanocomposites. The impact of [EMIM]OAc on silica dispersion in a nitrile rubber (NBR) matrix was investigated by a transmission electron microscope and scanning electron microscopy. The combined use of the ionic liquid and silane in an NBR/silica system facilitates the homogeneous dispersion of the silica volume fraction (φ) from 0.041 to 0.177 and enhances crosslinking density of the matrix up to three-fold in comparison with neat NBR, and also it is beneficial for solving the risks of alcohol emission and ignition during the rubber manufacturing. The introduction of ionic liquid greatly improves the mechanical strength (9.7 MPa) with respect to neat NBR vulcanizate, especially at high temperatures e.g., 100 °C. Furthermore, it impacts on rheological behaviors of the nanocomposites and tends to reduce energy dissipation for the vulcanizates under large amplitude dynamic shear deformation.Keywords:nitrile butadiene rubber;rheology;ionic liquids;tensile properties
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·7701
·
IF 4.927
Wenjie Qu,Xueping Guo,Guixin Xu,Songyan Zou,Yuwen Wu,Chenyu Hu,Kuan Chang,Jing Wang
Chemical treatments of hair such as dyeing, perming and bleaching could cause mechanical damage to the hair, which weakens the hair fibers and makes the hair break more easily. In this work, hyaluronate (HA) with different molecular weight (MW) was investigated for its effects on restoring the mechanical properties of damaged hair. It was found that low-MW HA (average MW~42 k) could significantly improve the mechanical properties, specifically the elastic modulus, of overbleached hair. The fluorescent-labeling experiments verified that the low-MW HA was able to penetrate into the cortex of the hair fiber, while high-MW HA was hindered. Fourier transform infrared spectrometry (FT-IR) results implied the formation of additional intermolecular hydrogen bonds in the HA-treated hair. Thermos gravimetric analysis (TGA) indicated that the HA-treated hair exhibited decreased content of loosely bonded water, and differential scanning calorimetry (DSC) characterizations suggested stronger water bonding inside the HA-treated hair, which could alleviate the weakening effect of loosely bonded water on the hydrogen bond networks within keratin. Therefore, the improved elastic modulus and mechanical strength of the HA-treated hair could be attributed to the enhanced formation of hydrogen bond networks within keratin. This study illustrates the capability of low-MW HA in hair damage repair, implying an enormous potential for other moisturizers to be used in hair care products.Keywords:hair damage;hyaluronate;mechanical properties;tensile properties;hydrogen bond
研究领域:
生物学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Hongzhou Xie,Linbo Wu,Bo-Geng Li,Philippe Dubois
Poly(ethylene-co-hexamethylene 2,5-furandicarboxylate) (PEHF) copolyesters with high intrinsic viscosity were synthesized from 2,5-furandicarboxylic acid (FDCA), ethylene glycol (EG), and 1.6-hexanediol (HDO) through two-step melting polycondensation, characterized with 1H NMR, DSC, WAXD, and TGA, and assessed by tensile and impact tests. The molar fraction of HF unit in PEHF (ϕHF), namely, copolymer composition, is higher than the molar fraction of HDO in the feeding diols and can be predicted empirically via Mayer–Lewis equation with apparent reactivity ratio rHDO = 4.6 and rEG = 0.74. All the PEHFs exhibited a single glass transition temperature and excellent thermal stability. HF-rich (ϕHF ≥ 88 mol %) PEHFs are semicrystalline but the others are almost amorphous. In comparison with PEF, PEHFs with ϕHF of 28–36 mol % possess significantly improved tensile ductility (elongation at break 54–160%) and retain high tensile modulus (2.6–2.2 GPa) and yielding strength (71–65 MPa). The tensile properties are comparable to those of bottle-grade PET.
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
RSC Advances
·
2017
·Vol. 7
·期 87
·55418-55426
·
IF 3.108
Meiling Chen,Nesren A. H. Saada,Fei Liu,Haining Na,Jin Zhu
Lauric diacid (LCDA), also known as 1,12-dodecanedioic acid, is used to develop a series of copolyesters along with 1,4-cyclohexanedicarboxylic acid (CHDA) and 1,4-butanediol (BDO). The resulting poly(butylene lauric dicarboxylate-co-butylene 1,4-cyclohexanedicarboxylate) (PBLC) is proved to be a random copolyester with three triad sequences. When the LCDA content increases from 20 to 60 mol%, Tm of the copolyester decreases from 133 to 57 °C. At the same time, the tensile modulus and strength decrease from 94 and 14 MPa to 40 and 5 MPa, respectively. Moreover, the elongation at break also drops from 640 to only 50%. However, further increasing the LCDA content to 80 mol%, the copolyester becomes amorphous with no Tm, and its tensile modulus, strength, and the elongation at break all improve significantly to 68 and 7 MPa, and over 1400%, respectively. More importantly, for the homo-polymer poly(butylene lauric dicarboxylate) (PBL), it has a relatively high Tm of 73 °C compared to that of polycaprolactone (PCL), but lower tensile modulus and strength, and significantly higher ductility, compared to those of PCL, linear low density polyethylene, and polybutylene succinate.
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
Science Advances
·
2025
·Vol. 11
·期 12
·
IF 12.5
Zekai Wu,Chengzhen Chu,Yuhui Jin,Lei Yang,Bo Qian,Yuepeng Wang,Yihan Wang,Jiani Wu,Yujie Jia,Wenwen Zhang,Zhengwei You
There is usually a trade-off between high-tensile properties and processability in polymers because the mechanisms of these properties are mutually exclusive. Here, we design a chemically coupled four-arm dynamic polymer cross-link site to overcome this challenge. By concurrently increasing cross-link sites and dynamic bond contents, this approach fabricates polymer networks with high cross-link density yet low processing temperature, challenging the conventional structure-property relationship where cross-linking inherently limits plasticity. Notably, the material demonstrates remarkable processability, evidenced by the ratio of G′max to G′min with a temperature differential (ΔT) of 120°C (which signifies the soft-to-hard transition capability). This ratio reaches 153.3, higher than all reported cross-linked polyurethanes. This work represents a molecular strategy that combines electronic effect and topology network design to modulate materials’ properties, and it will be useful for developing next-generation materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Jun Xu,Tiantian Hao,Changlin Liu,Jingjing Bi,Jing Sun,Zheng Wen,Zhaosheng Hou,Jinjian Wei
In this paper, we synthesized a new type of pH-responsive block polyurethane (PMCU) through the condensation polymerization of N-methyldiethanolamine (MDEA), poly(ε-caprolactone) and 4,4′-dicyclohexylmethane diisocyanate. The chemical structure of the PMCU were characterized, and the influence of MDEA content on the physicochemical properties of the casted PMCU films were studied detailly. The tensile test demonstrated the good tensile properties of the PMCU films with the breaking strain of 983–425% and the ultimate strength of 11.7–31.2 MPa. The tertiary amine groups and polyester segments endowed the material with pH sensitivity and hydrolytic degradability, respectively. The pH responsiveness of the films was confirmed from the enhanced equilibrium swelling ratio (ESR) with decreasing pH value of the medium, and the ESR in acidic condition (pH 1.5) was much higher than that in neutral (pH 7.0) and basic (pH 12.0) conditions. The studies of drug sustained-release in vitro at different pH indicated a pH-dependent release efficiency, which was closely related with the ESR and almost unaffected by the slow hydrolytic degradation. In addition, the cytotoxicity assay showed that the PMCU had good cytocompatibility to L929 cells. This study showed that pH-responsive promising platform for targeted drug delivery in the biomedical areas.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Jingshan Rao,Chaoyi Shen,Zhichao Yang,Olaniyi Amos Fawole,Jiangkuo Li,Di Wu,Kunsong Chen
Much attention and endeavor have been paid to developing biocompatible food packaging films. Here, ethyl cellulose (EC) and polyvinylpyrrolidone (PVP) were fabricated into films through a facile method, microfluidic spinning. Morphology observations showed that the fibers were neatly arranged with an average diameter of 1–4 μm. FTIR and X-ray diffraction analysis suggested the existence of good compatibility and interaction between EC and PVP. Thermogravimetric analysis demonstrated that PVP ameliorates the thermal properties; moreover, the tensile properties were improved, with tensile strength (TS) and Young's modulus up to 11.10 ± 1.04 MPa and 350.16 ± 45.46 MPa, respectively. The optimal formula was EC/PVP (2:3), of which the film displayed an enhanced TS of 4.61 ± 1.15 MPa and a modified water contact angle of 61.8 ± 4.4°, showing fine tensile and hydrophilic performance. This study provides a facile and green film fabrication method promising to be used for food wrapping.
研究领域:
食品科学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Li Qiuying,Li Xifei,Liu Dekun,Xu Ruiyang,Wei Shaohua
Requirements for the material with high tensile strength and elongation at break are proposed with the development of soft and stretchable electronics. The nitrile butadiene rubber (NBR) crosslinked by coordination bonds has excellent tensile properties and is expected to be used in the flexible electronics field, but the effect of strain rate on tensile properties of crosslinked NBR needs to be further analyzed. In this work, the NBR with dual crosslinked networks was prepared by methods of double ligands crosslinking, covalence-coordination crosslinking, and bimetallic coordination crosslinking. Furthermore, the strain rate sensitivity of tensile properties of NBR with dual crosslinked networks was studied by considering the strain rate as a variable. The results indicated that the strength of the coordination bonds formed by the second ligand had significant effects on the tensile properties of NBR: The coordination bonds with low strength could protect the integrity of the crosslinked network, but the tensile properties of NBR with two different kinds of strong coordination bonds would be more dependent on the strain rate. In covalence-coordination crosslinked or bimetallic crosslinked NBR, the synergy between the two crosslinked networks could not only increase the strength and elongation at break of NBR but also reduce the influence of strain rate on the tensile properties of NBR.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Zhu Xiong,Xinyan Dai,Ruoyu Zhang,Zhaobin Tang,Haining Na,Jin Zhu
A biobased monofunctional compatibilizer (called Epicard) is first synthesized by the reaction of cardanol with epichlorohydrin as confirmed by Fourier transform infrared and 1H NMR. Subsequently, biosourced polymers, polylactide (PLA) and starch, are melt-blended by a twin-screw extruder with Epicard. Confirmed by the measurements of contact angle and 1H nuclear magnetic resonance of the extracted starches from PLA/starch/Epicard blends, the Epicard only possesses a monoepoxy group to mainly react with starch and then increased the hydrophobicity of the starches during the melt-blending process. As a result, an obvious improvement to the interfacial adhesion between starch and PLA is observed by the scanning electron microscopy. Furthermore, the tensile properties of PLA/starch blends are effectively improved with the addition of Epicard. This study suggests a simple but effective material technique by utilizing a novel plant oil modifier to increase interfacial adhesion in fabricating fully biobased PLA/starch blends with superior tensile properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COMPOSITE STRUCTURES
·
2024
·
IF 6.3
Zheng Sun,Quan-Xiu Liu,Feng Liu,Yuan-Qing Li,Fang-Liang Guo,Shao-Yun Fu
The reliability of short fiber reinforced polymer composites is crucial for their successful applications in aerospace engineering with cryo-thermal cycling (CTC). This study investigates the influences of CTC on the tensile properties of short carbon fiber (SCF)/polyetherimide (PEI) composites at room temperature (25 °C) and elevated temperature (170 °C). First, SCF surfaces were coated by carbon nanotube-polydomaine (CNT-PDA) hybrid sizing, and then SCF/PEI composites were prepared via the facile injection molding technique. Impressively and unexpectedly, the tensile strength at 25 °C and 170 °C of SCF/PEI composites is all enhanced by the CTC exposure, attributing to the enhanced mechanical properties of PEI matrix and fiber/PEI interface bonding. In addition, CNT-PDA sizing and CTC exposure have a combined effect on improving the tensile properties of SCF/PEI composites at 25 °C and 170 °C. Overall, the SCF/PEI composites exhibit excellent mechanical properties under extreme service conditions, and are thus promising to serve in aerospace components.
研究领域:
航空航天工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Gui Yang,Xiaoyuan Zhang,Jingzhan Zhu,Fengmei Su,Yuezhan Feng,Youxin Ji,Chuntai Liu,Changyu Shen
Developing stretchable electromagnetic interference (EMI) shielding wearable fabrics is crucial in light of the increasing electromagnetic pollution. However, achieving satisfactory stretchable shielding ability is challenging due to the significant difference in modulus between the elastic matrix and rigid conductive network. In this study, a dual wrinkled conductive network with macro-wrinkles on the surface of fabric and micro-wrinkles on the surface nanofiber was constructed by in situ anchoring silver coating onto a pre-stretched thermoplastic polyurethane (TPU) electrospinning fabric. The unique geometric dual-wrinkled structure not only enhances the EMI shielding performance from 57.9 dB to 77.8 dB by reinforcing multiple reflecting/scattering. More importantly, it can protect the conductive network from damage during stretching, achieving stretchable EMI shielding performance with maintaining effective shielding of 36 dB under 100 % tensile deformation. Notably, the EMI shielding performance can be restored to the initial level after strain recovery and still holds over 65 dB even after cyclic stretching for 500 times. Additionally, the dual-wrinkled structure imparts stretchable Joule heating and photothermal conversion abilities to the fabric enabling controllable personal thermal management. With its excellent hydrophobicity, gas permeability, and mechanical stretchability, the dual-wrinkled EMI shielding fabric holds significant prospects for the next generation of wearable electronics.
研究领域:
材料科学
·
电子纺织品
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jing Chen,Na Li,Nisha Jin,Yarong Dong,Tifeng Jiao
The preparation of hydrophobic surfaces has long been a question of great interest in a wide range of fields. Among them, the electrospinning technique stands out for its convenience, simplicity, and ease of manipulation. In this work, porous and uniform size CA-P(AA-AM) nanofiber films were prepared by the electrospinning method . Subsequently, the metal ions were introduced to form CA-P(AA-AM)-metal ions nanofiber films. The morphology and structure of the films were characterized through SEM , EDS-Mapping, XRD , and XPS . Besides, the tensile properties of P(AA-AM)-metal ions nanofiber films were tested by Tensile test , and the hydrophobicity of nanofiber membranes was analyzed by the water contact angle (WCA) test. The results showed that all P(AA-AM)-metal ion nanofiber membranes exhibited good hydrophobicity. And after 12 h of immersion treatment, the water contact angle increased by more than 60%. Furthermore, CA/P(AA-AM)-Cu nanofiber films and CA/P(AA-AM)-Cd nanofiber films show enhanced elastic moduli due to the coordination of metal ions to P(AA-AM).
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）