INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Fengxian Ju,Lingyu Hua,Jing Xu,Tianduo Li,Tao Wei,Aijie Lv,Huan Yang
Rigid and fragile nature of collagen-based materials cross-linked with biocompatible aldehyde-functionalized polysaccharides remains a challenge. Drawing inspiration from the pangolins' protective barrier, we introduce a novel cross-linker with a flexible chain to impart a “rigid-flexible coupled structure” to the collagen-based matrix. Successful integration of dibenzaldehyde-terminated-PEG (DF-PEG) into collagen molecules was confirmed by XRD and FTIR analyses. CD measurements demonstrated that the intact triple-helical structure was preserved in all samples. Distinct effects of DF-PEG with varying molecular weights on the aggregation behavior of collagen molecules were evaluated using multiple quantitative analysis techniques. Specifically, when the molecular weight of DF-PEG was below 20,000, multipoint hydrogen bonds and Schiff-base linkages were produced as the molecular weight of DF-PEG increased, which synergistically enhanced the aggregation behavior of collagen molecules. While the aggregation behavior of collagen molecules was slightly diminished upon the molecular weight of DF-PEG reached 20,000. This reduction can be attributed to the limited accessibility of the molecular reactive sites in the extended DF-PEG chains. Finally, a computational test of the binding interactions between collagen molecules and DF-PEG was conducted to validate the experimental results. Our biomimetic design strategy offers a new approach for the preparation of collagen-based materials with exceptional physicochemical properties.
研究领域:
生物材料学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 38
·49143
·
IF 2.52
Qian Zhang,Guokang Chen,Kun Wu,Jun Shi,Liyan Liang,Mangeng Lu
A biphenyl type liquid crystal epoxy (LCE) monomer 4,4′-di(2,3-epoxyhexyloxy)biphenyl (LCBP4) containing flexible chain was synthesized and the curing behavior was investigated using 4,4′-diaminodiphenylmethane (DDM) as the curing agent. The effect of curing condition on the formation of the liquid crystalline phase was examined. The cured samples show good mechanical properties and thermal stabilities. Moreover, the relationship between thermal conductivity and structure of liquid crystalline domain was also discussed. The samples show high thermal conductivity up to 0.28–0.31 W/(m*K), which is 1.5 times as high as that of conventional epoxy systems. In addition, thermal conductive filler, Al 2 O 3 , was introduced into LCBP4/DDM to obtain higher thermal conductive composites. When the content of Al 2 O 3 was 80 wt%, the thermal conductivity of the composite reached to 1.86 W/(m*K), while that of diglycidyl ether of bisphenol A (Bis-A) epoxy resin/DDM/Al 2 O 3 was 1.15 W/(m*K). Compared with Bis-A epoxy resin, the formation of liquid crystal domains in the cured LCE resin enhanced the thermal conductivity synergistically with the presence of Al 2 O 3 . Furthermore, the introduction of Al 2 O 3 also slightly increased the thermal stabilities of the cured LCE.
研究领域:
材料科学
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热力学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Panpan Yang,Yifei Wu,Kunxin Wang,Xiaole Zheng,Junxi Wan,Kun Wu,Jun Shi,Peiwei Hong,Li Yang
Polymers with high thermal conductivity are crucial for addressing the heat dissipation challenges associated with high-performance compact electronic devices. In this work, a series of high thermal conductivity polyesters (PEnx) were synthesized. Their molecular structure is regulated by introducing flexible chains with segments containing n methylene units between 2 and 8. The thermal diffusivity and thermal conductivity of a series of polyesters were studied in relation to their structure. As a result, the thermal diffusivity of polyesters rose from 0.173 to 0.334 mm2 s–1. PEn6 exhibits a thermal conductivity of 0.578 ± 0.0021 W/(m·K), which is 180% higher than PEn2 and three times higher than conventional thermoplastics. The enhanced thermal conductivity can be attributed to the regular molecular structure, which augments heat transfer by mitigating phonon scattering. Thus, it is possible to enhance both the heat absorption and thermal conductivity of the polymer by adjusting the number of methylene groups in the polyester. Meanwhile, the main diffraction peaks of all of the polyesters were around 20°, indicating their semicrystalline nature. Furthermore, PEn6 has excellent thermal stability with a T5% of 396.2 °C, Tmax of 431.1 °C, and residual carbon content of 6.47% at 800 °C.
研究领域:
材料科学
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热物理学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 77
·49074-49082
·
IF 3.108
Yizhou Huang,Yazhou Tian,Yuanyuan Li,Xiaocun Tan,Qing Li,Jue Cheng,Junying Zhang
A series of epoxy systems with tunable rigid-flexibility were prepared by the curing reaction of bisphenol F diglycidyl (DGEBF), a single-ended amine with alkyl chains (n-butyl, octyl, dodecyl), 4,4′-diaminodiphenylmethane (DDM) and 4,4′-diaminodicyclohexylmethane (H-DDM). By means of adjusting the composition of the curing agent (the molar ratio between H-DDM and DDM), nano- and submicron-sized phase separations were observed by atomic force microscopy (AFM). And diffraction peaks were not observed in the wide angle X-ray scattering (WAXS) characterization which revealed that there was no crystallization in the modified epoxy resin. Besides, the result of nanoIR characterization proved that the aggregation of aliphatic chains led to the microphase separation structure, which can remarkably improve the mechanical properties of epoxy resins. The effects of side chains on the mechanical and thermal properties of epoxy networks were investigated. Especially, the EC8-5′ (the molar ratio between H-DDM and DDM was 45/55, the mass ratio of the n-octyl amine to DGEBF was 5 : 100) sample exhibited splendid mechanical properties with an attractive tensile strength of 88.4 MPa, an elongation at break of 6.6% and a tensile modulus of 3.5 GPa.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2023
·Vol. 33
·期 1
·93-103
·
IF 3.1
Wan Liying,Yan Meiling,Wang Jianhong,Liu Xianglong,Huang Juntong,Yang Hao,Kong Xinming
This study reports the innovative preparation of triple-shape-memory epoxy resin (EP-DA) through thermal programming. Flexible poly(propylene glycol) diglycidyl ether (PEGDE) segments and reversible Diels–Alder (DA) dynamic covalent bonds were introduced into epoxy resin through molecular structural design, controlling glass transition temperature ( T g ) and DA reaction temperature, respectively, which then was used as the two reversible switches of EP-DA. FTIR results verified that PEGDE and DA bond were successfully brought in EP-DA network. DSC and TG tests were used to demonstrate the three stages of EP-DA thermal behavior: T g , DA thermal reversible reaction temperature and thermal degradation temperature. Bending-recovery test verified the dual-shape-memory, and DMA test verified the excellent triple-shape-memory of EP-DA. The general elastic deformation, high elastic deformation and flow deformation of EP-DA molecular segments revealed its shape-memory mechanism. Furthermore, when PEGDE content increased, T g , crosslinking density of EP-DA, fixity ratio and strength decreased, toughness increased, and recovery rate as well as recovery speed were promoted. The thermal reversibility of DA bonds in EP-DA also endues it with retrievability and self-reconstruction. Graphical abstract
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yiyuan Sun,Zenghui Yang,Liming Tao,Qihua Wang,Xinrui Zhang,Yaoming Zhang,Tingmei Wang
It remains a challenge to balance the trade-off between toughness, stiffness, and shape memory properties in shape memory epoxy resins (SMEP). In this study, we employed molecular engineering to synthesize stiff–flexible SMEP, by reacting furan-containing epoxy monomers 2,5-bis[(2-epoxymethoxy)methyl]furan (BOF), derived from biomass, with amines containing imine-amine (IA) and 4,4′-dithiodiphenylamine (4-DTDA). The results indicate that the sacrificial hydrogen bonding and the necessary flexible segments confer BOF/4-DTDA/IA (BDI) with a toughness of up to 13.9 MJ/m3 and a stiffness of 3.5 GPa. Furthermore, the introduction of hyperbranched epoxy resin (HER) yields BOF/4-DTDA/IA/HER (BDIH), which maintains a stiffness exceeding 2 GPa while retaining a toughness of 11.2 MJ/m3. Additionally, BDIH exhibits enhanced tensile strength with an increasing strain rate, which we rationalize based on the loss modulus and scanning electron microscopy morphology analyses. The collaborative motion of the rigid–flexible chain segments and the hydrogen bonding contributes to BDI’s excellent shape memory performance (shape fixation ratio (Rf = 99.00%) and shape recovery ratio (Rr = 99.15%). The physical barrier effect and flexibility of the HER further enhance the shape memory properties. In conclusion, the mechanical features and shape memory performance of BDI and BDIH demonstrate the significant potential for applications in smart molds, smart devices, and other advanced technologies.
研究领域:
材料科学
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分子工程学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Wei-Qiang Du,Teng Fu,Xing-Liang Li,Yao Li,Cong Deng,Xiu-Li Wang,Yu-Zhong Wang
High-performance biobased polyesters with excellent thermal, mechanical, and gas barrier properties are in demand nowadays, while current design strategies have failed to endow polyesters with such integrated performances synchronously. Herein, we synthesize a series of furan-based copolyesters poly(butylene 4-hydroxy-N-(2-hydroxyethyl)2,5-furandicarboxylate) (PBAnF) containing an amide structure and flexible aliphatic segments in the main chains via condensed polymerization. The resultant copolyester PBA20F records balanced pre-eminent mechanical properties including tensile strength (78.0 MPa) and a large elongation at break (199%) while exhibiting a high glass transition temperature (54 °C) and a good enough gas barrier property. Such integrated excellent performances of copolyesters are ascribed to the combined effects of introduced intermolecular hydrogen bonds and flexible segments. Besides, PBAnFs still display high optical transparency in the visible region. This work provides an innovative design strategy to prepare a new class of advanced furan-based copolyesters with remarkable mechanical, thermal, and gas barrier properties, thus supplying a series of promising high-performance biobased copolyesters for potential packaging applications.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 9
·6149-6163
·
IF 5.2
Hui Ling,Ziting Zhen,Yuhang Sun,Gang Li,Chao Wang,Xiaoping Yang
Naphthalenediimide copolymers with long, middle and short flexible chain lengths (LN, MN and SN) were designed and used to construct rigid-flexible interphase on high-modulus carbon fiber (HMCF) surface, and the interfacial performance and interphase reinforcing mechanism of composites were explored. Compared with desized HMCF (HMCF-desized), the surface activity and roughness of HMCF-LN, HMCF-MN and HMCF-SN were gradually increased. In contrast to HMCF-LN and HMCF-MN composites, wider transit-modulus platform and increased interphase thickness were detected in HMCF-SN composites, the improved deformation and decreased thermal residual stress from rigid-flexible interphase were obtained. The highest improvement of transverse fiber bundle test strength (TFBT) and interfacial shear strength (IFSS) of HMCF-SN composites were achieved, which was ascribed to the effective relaxation of interfacial stress and stronger chemical interaction of HMCF-SN with matrix by the reduced flexible chain lengths and the increased functionality of SN copolymers. Highlights Rigid-flexible interphase was constructed by naphthalenediimide copolymers. Wider transit-modulus platform was detected in HMCF-SN composites. Improved deformation and decreased residual stress of interphase were obtained. The interfacial performance of HMCF-SN composites were greatly improved.
研究领域:
材料科学
·
复合材料工程
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Yanhua Yang,Hang Lu,Juqing Liu,Yingzhong Shen
An efficient and readily available novel carbazole-based aromatic diamine was synthesized and characterized. Two polyimides ( PI-a and PI-b ) were prepared via a two-step procedure using the new synthesized diamine reacting with low-cost and the commercialized pyromellitic dianhydride (PMDA) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), respectively. PIs were characterized and exhibited highly organo-solubility and thermal stability. The Al/ PI-a /ITO device showed binary write-once read-many-times (WORM) behavior with an ON/OFF current ratio up to 10 9 and the threshold voltage as low as −0.21 V, whereas the Al/ PI-b /ITO device presented ternary WORM behavior with an ON2/ON1/OFF current ratio up to 10 5 :10 4 :1 and the switching voltage below −3 V. The memory switching mechanisms were further elucidated through molecular simulation based on the density functional theory (DFT) method. This provides an effective strategy to achieve a ternary memory device.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xinzhu Zhang,Tingyu Li,Zhi Wang,Jixiao Wang,Song Zhao
The practical application of solvent-resistant nanofiltration (SRNF) still faces major challenges arising from the swelling and dissolution of substrates in organic solvents , especially in polar aprotic solvents such as dimethylformamide (DMF). To address these issues, polytetrafluoroethylene (PTFE) substrates with strong resistance to organic solvents was employed to fabricate solvent-resistant nanofiltration composite membranes . A novel reverse flexible-chain binding interfacial polymerization (rFB-IP) was proposed to fabricate polyamide (PA) selective layer onto PTFE substrate with ultra-low surface energy. Specifically, aiming at strengthening the bonding force between the substrate and selective layer, PDMS was employed as a flexible-chain binder to generate a cross-linked network on the substrate surface and within the pores to generate an interpenetrating structure with PA selective layer. The as-prepared rPA-PDMS/mPTFE composite membrane exhibited DMF permeance of 0.4 L m −2 h −1 bar −1 , 97.1% rejection to Rose Bengal (RB), a stable performance during a filtration process for 120 h, or after being immersed in DMF for 120 d. Therefore, the rFB-IP technique successfully settled the issues of the application of PTFE substrate for composite membrane fabrication, and would have outstanding potential in the development of polar aprotic SRNF membrane .
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Chi Zhang,Zixuan Lei,Yuhong Liu
Mechanical properties of thermosetting polymers are intricately linked to the heterogeneity of cross-linked network structures, particularly in balancing strength and toughness. To tackle this trade-off, this work presents how the cross-linking and heterogeneous network influence the viscoelastic and mechanical behaviors of polybenzoxazine (PBZ) resins via tuning cross-linked bonding modes and network topologies. A novel epoxy resin bearing Si-O-Si flexible groups (ES) with different pre-polymerization conversions was incorporated into PBZ cross-linking network. Utilizing imidazole as both a catalyst and curing agent, three network topologies of P(BZ-PESI X ) blends were fabricated via the specific curing cycles. Note that the ratio of thermal and catalytic curing units for three network topologies increased and then dropped as the PESI conversions increased from PESI 0 to PESI 100 . It was found that the chemical reactions involving functional groups, active sites and end groups from free, dangling, and unequal length chains can be significantly enhanced by thermal curing at high temperature ranges. This resulted in a decrease in heterogeneity of the cross-linked network. For cross-linked copolymer networks topology (P(BZ-PESI 40 )), the flexural strength, impact strength and K IC were 26.6 %, 36.7 % and 193.5 % higher than that of neat PBZI respectively. Meanwhile, a significant increase in cross-linking density and storage modulus was observed. It was confirmed that the strengthening and toughening mechanism of resins can be summarized as the synergistic effect of reduced network heterogeneity, plastic deformation effect of Si-O-Si flexible chain segments, and weakened hydrogen-bonding interactions. These insights offer practical and economic prospects for the development of versatile, high-performance thermosetting materials.
研究领域:
材料科学
·
高分子化学
·
机械工程
·
化学工程
·
纳米技术
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Wei Tang,Dan Liu,Jun-Qiao Wang,Xiao-Jun Huang,Jun-Yi Yin,Fang Geng,Shao-Ping Nie
A low methyl-esterified pectin (33.2% methyl-esterification degree) was isolated from the tuber of Dioscorea opposita Thunb., which was an edible and medicinal material in China. This pectin ( M w of 1.3 × 10 4 g/mol) contained the ~59.1% homogalacturonan (HG) and ~38.1% highly branched rhamnogalacturonan I (RG-I) region with possible side chains embracing arabinogalactan II, arabinan or arabinogalactan I. The fragments including HG backbone consisting of → 4)-α-Gal p A-(1 → and → 4)-α-Gal p A-6- O -methyl-(1 → with molar ratio of ~2:1, and repeating unit of arabinogalactan II side chain composed of α-Ara f -(1 → and → 3,6)-β-Gal p -(1→, were speculated through methylation analysis and NMR spectra. However, the linkage pattern for RG-I backbone and side chains were indiscernible due to limited resolution of NMR spectra. Besides, the pectin adopted a flexible chain conformation in 0.1 M NaNO 3 solution. These results provided a structural basis for study on polysaccharide from D. opposite , which was benefit for development of functional food of yam.
研究领域:
食品科学
·
植物化学
·
多糖结构
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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）