IRANIAN POLYMER JOURNAL
·
2012
·Vol. 21
·期 10
·721-730
·
IF 0.936
Yan Zhenlong,Liu Weiqu,Gao Nan,Sun Yue,Chen Haisheng
A novel dicarboxyl-terminated poly(2,2,3,4,4,4-hexafluorobutyl acrylate) oligomer (CTHFA) was synthesized through metal-free anionic polymerization and hydrolysis reaction. Chemical structures of CTHFA were characterized by gel permeation chromatography and 1 H NMR. Two types of CTHFA with different chain lengths were initially used as an efficient surface modifier to improve the surface properties of epoxy resin, at the content of CTHFA ranging between 0 and 8 wt%. We minimized the amounts of the CTHFA used to achieve a high hydrophobic surface that was not obviously affected by the thermal properties of the epoxy resin. Surface properties and surface composition of the designed fluorinated epoxy resin were investigated by the contact angle and X-ray photoelectron spectroscopy (XPS). Modified epoxy resin with 5 wt% CTHFA containing longer chain length showed excellent hydrophobic surface properties (a high water contact angle about 115° and low surface energy 14.12 mN/m 2 ) while the modified epoxy resin with 5 wt% CTHFA containing shorter chain length did not. XPS analyses indicated that the 5 wt% of fluorinated CTHFA epoxy resin with long macromolecular-chain enhanced more fluorinated groups’ migration to the surface than the fluorinated CTHFA-modified epoxy resin with short macromolecular-chain at the same content. Moreover, thermal properties of CTHFA-modified epoxy resin were also investigated.
研究领域:
材料科学
·
高分子化学
·
表面工程
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 5
·1305-1316
·
IF 1.584
Shi Hongyi,Liu Weiqu,Liu Chunhua,He Sha,Jiang Chi,Wang Zhengfang
Monomethacryloyloxy-terminated fluorinated oligomers (PPFOMA-GMA and PHFBMA-GMA) and methyl allyl alcohol polyoxyethylene ether-modified epoxy resin (HPEGEA) were successfully synthesized and used as reactive additives and emulsifier for epoxy acrylate, respectively. FTIR, 1 H NMR, and GPC were used to characterize the structures of PPFOMA-GMA, PHFBMA-GMA, and HPEGEA. The influence of the concentrations of PPFOMA-GMA and PHFBMA-GMA on the properties of waterborne epoxy acrylate (WEA) resin coatings was investigated. The surface energy of waterborne epoxy acrylate coating was decreased from 38.20 mN/m to 15.31 mN/m by adding just 0.21 wt% PPFOMA-GMA, indicating its high effectiveness in improving the hydrophobic properties of the surface. The surface compositions of the WEA resin coatings (with 0.85 wt% PPFOMA-GMA or 0.85 wt% PHFBMA-GMA) were characterized by XPS. The XPS results confirmed the quantitative enrichment of fluorine atoms on the surface. What is more, the physical properties of waterborne epoxy acrylate coatings prepared with different concentrations of fluorinated reactive additive, such as optical transmittance, adhesion (on glass, PET, and tinplate), pencil hardness, water absorption, and thermal properties, were also analyzed in detail. Hence, the waterborne epoxy acrylate coatings prepared with low concentrations of reactive additives were economical and have potential for large-scale industrial applications.
研究领域:
高分子化学
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材料科学
·
表面工程
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DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Jie Huan,Jing Li,Yinjia Lan,Sheng Wang,Xiaohong Li,Xiaoming Yang,Huanjun Lu,Yingfeng Tu
We present here the effect of oligo(ethylene glycol) (OEG) segmental length on properties of cyclic oligo(oligoethylene glycol terephthalate)s (COEGTs) and their corresponding polymer counterparts, poly(oligoethylene glycol terephthalate)s (POEGTs). COEGT monomers were synthesized from terephthaloyl chloride with corresponding diethylene glycol , triethylene glycol , and tetraethylene glycol under pseudo-high-dilution conditions. As those large ring cyclic monomers are hard to be polymerized via traditional ring-opening polymerization, a cascade polycondensation-coupling ring-opening polymerization method is utilized to obtain high molecular weight POEGTs. The cascade polymerization mechanism is confirmed by the kinetics study . The structures of COEGTs and POEGTs were well characterized and their properties were studied to reveal the structure-property relationship. With the increment of OEG length in repeating units, the chain flexibility of POEGT and COEGTs is enhanced. As a result, the melting temperatures of COEGTs and glass transition temperatures of POEGTs decrease. On the other hand, the thermal degradation temperature of POEGTs and COEGTs increases due to the enhanced ether fraction and reduced ring strain. Solid-state polymer electrolytes based on POEGTs was prepared by blending with lithium bis(trifluoromethanesulfonyl)imide. The measured ionic conductivity increased with the OEG length in POEGT repeating units. Our results revealed the effect of OEG length on the structure-property relationship in cyclic oligo(ether ester)s and copoly(ether ester)s, providing a facile way to tune their properties.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2018
·Vol. 16
·期 3
·681-688
·
IF 1.619
Wu Jianbing,Zhang Ruofei,Li Ping,Ma Guozhang,Hou Caiying,Zhang Hui
A series of novel fluorinated polyacrylic acrylate oligomers with different fluorine contents were successfully prepared by acid–epoxy reaction between acrylic acid and a glycidyl methacrylate (GMA)-functional acrylic copolymer, which was presynthesized by traditional free radical polymerization in solvent with ethyl methacrylate, n -butyl acrylate, dodecafluoroheptyl methacrylate, and GMA. The UV-curable coatings were prepared with various amounts of the obtained fluorinated polyacrylic acrylate oligomer. The influences of fluorine content on the properties of UV-curable films were investigated by the tests of hydrophobicity, oleophobicity, thermal stability, water absorption, hardness, and chemical resistance. The results showed that the water contact angle of cured films increased from 78.5° to 104.5°, n -hexadecane contact angles increased from 12.3° to 43.4°, the water absorption decreased from 1.27% to 0.63%, while the fluorine content of the cured films increased from 0 to 5.7 wt%. In addition, thermal stability and chemical resistance of the curable films containing fluorinated oligomer were also clearly improved.
研究领域:
高分子化学
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材料科学
·
表面工程
·
涂料技术
·
功能材料
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Yansong Wang,Yinlan Ruan,Bobo Du,Ji Li,Heike Ebendorff-Heidepriem,Xuechuan Wang
Formaldehyde (FA) is widely applied as a fixative for proteins such as collagen. Current studies have confirmed that the reversible oligomer-to-monomer equilibrium of FA in aqueous solution and the proportion of FA monomer is a significant factor affecting tissue fixation. Since the hydrolysis of FA oligomers is a dynamic process affected jointly by different factors, its real time monitoring has proved to be challenging. In this work, by utilizing the well-established Raman technique as an analytical platform, we identified the factors affecting the hydrolysis of FA oligomers by rationally examining the ν s (OCO) and ν as (OCO) modes with varying conditions, such as time, pH, temperature, and FA concentration. The optimized conditions of the highest hydrolysis rate of oligomers into monomers for fixation on collagen and tissues have been found to be relatively low FA concentration (≤5%) in phosphate-buffered saline at pH 9.0 in room temperature. In order to compare the fixation quality of the optimized conditions to that of the conventional conditions used by current medical practices (4% FA concentration in tap water under room temperature), Raman spectroscopy and chemical derivatization methods with o-phthalaldehyde and fluorescent probe FAP-1 have been investigated, and our results revealed that the FA molecules under our optimized conditions have reacted with at least 15% more amino groups within collagen compared to those under the conventional conditions mentioned above. This study provides direct evidence of the FA equilibrium in solution by Raman spectroscopy, which could be applied for the optimal use of FA in medicine, even at an industrial scale.
研究领域:
生物医学工程
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分子生物学
·
组织病理学
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光谱分析
·
蛋白质化学
·
转化医学
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DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Junting Gao,Feng Gao,Ke Liu,Wenxing Chen,Wangyang Lu
In the industrial production of polyamide 6 (PA6), hot water extraction is commonly used to remove monomers (caprolactam, C1) and cyclic oligomers. This cumbersome process hinders the realization of direct melt spinning and results in considerable energy waste. Herein, the occurrence of the cyclization reaction was effectively decreased using long-chain ammonia as a capping agent and reducing the ring-opening temperature. At the same time, the coordination between rare earths and carbonyl oxygen significantly increased the free energy barrier that needs to be overcome for the formation of cyclic dimers (C2) and formed steric hindrance that hinders the attack of terminal amino groups on amide bonds. Under the synergistic effect, the cyclic oligomer and cyclic dimer contents in PA6 were 1.75 wt% and 0.19 wt%, respectively, which were 48% and 76% lower than those in terminal aggregation PA6 (PA6-C, 3.36 wt% and 0.79 wt%), respectively. In order to meet the standard of the total oligomer content in spinning grade PA6, C1 and the partial cyclic oligomer were rapidly removed under high temperature and vacuum. The content of the oligomer decreased to 1.47 wt%, which was less than 2.0 wt% of the spinning requirement, and the relative viscosity increased to 2.53. This is similar to the oligomer content of industrial PA6 with a relative viscosity of 2.47, extracted by hot water (1.53 wt%). In addition, the appearance of the γ-crystal form was conducive to the subsequent processing of PA6 and the saving of energy consumption. The significant increase in the content of terminal amino groups is beneficial for improving dyeing performance. This study provides a new solution for direct melt spinning of PA6 fibers, reducing the entire polymerization process time from 55 h to 10 h and increasing production efficiency by nearly 450%. Eliminating complex hot water extraction steps greatly saved water and energy, with a quantifiable electric energy savings of approximately 32.13% compared to hot water extraction methods.
研究领域:
高分子化学
·
材料科学
·
聚合物工程
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纤维科学
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物理化学
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节能工艺
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Boya Yuan,Wei Li,Shibo Yu,Yu Ogawa,Pan Chen,Yiwei Li,Jinming Zhang,Minmin Liang
Nanozymes are nanomaterials designed to mimic the catalytic functions of natural enzymes, offering advantages such as enhanced stability, tunability, and scalability. Although precise control over the spatial arrangement of catalytic centers is essential for maximizing nanozyme activity, it remains a fundamental challenge in nanozyme design. Here, we present a supramolecular strategy to achieve molecular-level engineering of catalytic centers by grafting hemin onto monodisperse cellulose oligomers (MCOs). The crystallization-driven self-assembly of MCOs directs the spatial organization of hemin while preventing its detrimental aggregation. Systematically tuning of the cellulose chain length reveals that a degree of polymerization (DP) of 6 optimally balances supramolecular packing and increased availability of active sites, whereas shorter (DP1) and longer (DP20) chains compromise catalytic performance due to aggregation or decreased substrate binding affinity. Structural analyses reveal that chain-length-directed crystallization governs nanozyme morphology, aggregation behavior, and catalytic performance. Through this approach, we achieve an approximately 500-fold enhancement in catalytic efficiency over free hemin, while structural analyses elucidate the role of chain-length-dependent crystallization in governing nanozyme morphology and performance. This study establishes transferable cellulose-based supramolecular strategy for engineering high-performance nanozymes with broad applicability across diverse catalytic systems.
研究领域:
纳米技术
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生物无机化学
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超分子化学
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材料科学
·
催化作用
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产品关联
DOI
PubMed
高影响因子
Advanced Industrial and Engineering Polymer Research
·
2025
·
IF 12
Zhiyong Zhen,Xianping Zeng,Xiangxing Zeng,Dong Tang,Zetong Ma,Zhongke Yuan,Xudong Chen
Poly(phenylene oxide) (PPO), recognized for its exceptional dielectric properties, serves as a preferred matrix resin for high-frequency and high-speed copper-clad laminates (CCLs). However, research on functionalized PPO resins is constrained by synthesis challenges, relying primarily on two commercial resins with fixed molecular weights/distributions and insufficient end-group functionalization. These exhibit performance bottlenecks in higher-grade CCLs applications, and crucially, lack systematic studies on the structure-processing-property relationships governed by tunable precursor oligomer polymerization degrees (DP). This work employs precursor oligomer engineering via direct copolymerization with methacrylic anhydride (MMA) as the capping agent to synthesize a series of PPO n -MMA oligomers (DP, n = 5–25) featuring an ultrahigh difunctional group content (>97%). These oligomers were blended with hydrocarbon resin, flame retardant, and crosslinker to prepare glass fiber-reinforced composites. Results demonstrate that the oligomer (DP, n = 5) significantly dictates processing behavior and performance: the system exhibits a minimum viscosity of 80 Pa·s (much lower than 700 Pa·s for commercial resin), a 38.6% increase in flexural strength, a glass transition temperature ( T g ) elevated to 241 °C, and a 96.7% increase in crosslinking density. The coefficient of thermal expansion (CTE) value is reduced to 8.6 ppm/°C (40-240°C). Furthermore, it achieves an extremely low dielectric loss ( D f = 0.0044) at 10 GHz with weak frequency dependence. This oligomer engineering strategy delivers superior processability, thermal resistance, mechanical strength, and dielectric properties. It elucidates the critical DP–processing–performance relationships, providing fundamental insights and technical pathways for developing high-performance functionalized low-molecular-weight PPO resins for next-generation high-frequency/high-speed CCLs.
研究领域:
高分子材料
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电子封装材料
·
介电材料
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聚合物化学
·
复合材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Run Tang,Mizeng Wang,Zihan Zhang,Jiayue Lu,Tao Huang,Wenli Zhang,Qiyu Liu,Xueqing Qiu
Glucan oligomers represent a high-value biochemical with distinctive applications in plant elicitors, probiotics, and anti-inflammatory pharmaceuticals. Selective conversion of sustainable cellulose to glucan oligomers significantly improves the economic viability of lignocellulosic biorefining. However, abundant hydroxyl groups on cellulose chains create strong interchain cohesion via hydrogen-bonding networks, severely hindering efficient cellulose processing in aqueous systems. This study presents an innovative cellulose exfoliation and hydrolysis strategy using glucose branching in a nonacidified molten salt hydrate (MSH). By strategically introducing glucose units at cellulose branching points, we address three critical challenges: (1) creating steric hindrance to disrupt interchain cohesion, (2) reducing hydrogen bonding between linear cellulose chains, and (3) enabling controlled glycosidic bond cleavage for oligomer production. Atomic force microscopy (AFM) direct force measurements quantitatively demonstrated reduced interchain adhesion from −0.285 to −0.058 mN/m following glucose branching. The optimized system achieved 80.6% yield of water-soluble glucan oligomers at 130 °C within 3 h, representing a 2.3-fold enhancement over conventional hydrolysis methods. Postreaction, glucan oligomers were efficiently isolated from the MSH medium through activated carbon adsorption, enabling MSH recycling.
研究领域:
生物炼制
·
碳水化合物化学
·
高分子科学
·
生化工程
·
绿色化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Leiming Guo,Martin Steinhart,Yong Yang,Liang Zhu
Cost-affordable phenolic membranes having gradient nanostructures can be facilely synthesized from resol oligomers in the presence of ZnCl 2 and poloxamers. The gradient nanostructures are formed by stacking phenolic nanoparticles with gradually enlarged diameters as the distance from the upper surface increases. The use of poloxamers for creating gelation surroundings is of great significance for controlling the nucleation and growth of phenolic nanoparticles, which in turn dictates the performance of the phenolic membranes thus-produced. Hence, a study of the effects of poloxamers species on the preparation of the phenolic membranes is highly demanded since such robust membranes have much potential to be scale up for mass production. Herein, the poloxamer Pluronic F127 (EO 106 -PO 70 -EO 106 ; EO = ethyleneoxide, PO = propyleneoxide) was introduced in the membrane-forming formulations. As opposed to P123 (EO 20 -PO 70 -EO 20 ) that we used previously, F127 possessing extended PEO chains can delay the gelation during membrane formation. Hence, the phenolic nucleates are able to grow for longer durations, leading to the generation of more distinct gradient nanostructures in the phenolic membranes. Enhanced permeance can then be realized with F127-derived phenolic membranes. We also demonstrate that L31 (EO 1 -PO 22 -EO 1 ) with merely single terminal EO units at the ends of the PPO block could be used to prepare gradient phenolic membranes. This work is not only much helpful to deeply understand the design of the structural gradient in phenolic membranes, but capable of sheding light on the development of such intriguing structures for water purification.
研究领域:
材料科学
·
膜技术
·
高分子科学
·
化学工程
·
水处理
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yadong Yu,Peng Liao,Zeyu Gong,Lina Zhou,Zhaoming Liu,Junbo Gong
Strength and toughness have traditionally been regarded as mutually exclusive, but simultaneously achieving both high strength and high toughness in organic‒inorganic nanocomposites remains a significant challenge. Inspired by natural nacre and bone, inorganic ionic oligomers and organic molecular chains are employed to achieve multiscale crosslinking assembly, advancing from the ionic-molecular level to nanolines, nanorods, nanofibers, microfibers, and ultimately to nanocomposite films and bulk nanocomposite materials. This process results in a highly integrated organic‒inorganic hierarchical ordered structure, imparting exceptional record-breaking ultrahigh toughness (558.90 ± 34.84 MJ m −3 ), excellent tensile strength (353.84 ± 18.77 MPa), and fracture energy (2.93 MJ m −2 ) to the nanocomposite films. The resulting bulk nanocomposite exhibits outstanding bending mechanical properties (a maximum bending stress of 207.17 ± 12.37 MPa, and a bending energy of 37.62 ± 7.33 MJ m −3 without fracture), exceptional fatigue resistance, and remarkable toughness in extreme environments (e.g., −196 and 200 °C). Furthermore, the nanocomposites can undergo hydrothermal-induced recycling and regeneration owing to their noncovalent crosslinking nature. Consequently, these nanocomposites exhibit significant potential for applications in high-performance structural engineering materials. The proposed organic‒inorganic multiscale crosslinking assembly tactic based on inorganic ionic oligomers presents a promising approach for the fabrication of ultrahigh-toughness nanocomposites.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
机械工程
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Qiang Mu,Qiangli Zhao,Min Mao,Yao Liu,Jie Tao,Jiahao Kang,Wei Yong,Xinhai He,Jianhua Ma,Jianwei Li
Multi-stimuli-responsive actuators attract significant interest due to their flexibility and adaptability to complex environments. However, achieving controllable response directionality and complex programmable deformation remains challenging. In this study, a humidity- and UV–visible light-responsive base film was developed using cellulose nanofibrils (CNF)/polyvinyl alcohol (PVA) functionalized with 4-hydroxyazobenzene (Azo). An asymmetric multi-stimuli-responsive composite film was fabricated via sequential coating of a polyimide (PI)/lignin oligomer (LIG) blend solution onto this substrate, exhibiting excellent dual humidity-light responsive deformation. The PI/LIG coating demonstrated excellent compatibility with the substrate, endowing the composite with excellent photothermally driven deformation and enhanced thermal stability. Under near-infrared (NIR) irradiation (100 mW/cm 2 , 60 s), the irradiated surface reached a maximum temperature of 64.07 °C. The actuator exhibited a moisture response sensitivity of 0.206 cm −1 /%RH −1 , along with excellent reversibility and remarkable responsiveness to sunlight, LED light, and NIR light. The distinct interfacial composition and response gradients enabled controllable deformation directions under moisture and light stimuli. Furthermore, stimulus-driven 2D-to-3D structural transformations, including grasping, lifting, and hinge-like motions, were achieved through diverse patterning strategies. This work provides a rapid and scalable approach for developing programmable patterned actuators with sophisticated deformation capabilities based on sustainable carbohydrate-derived materials.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
智能材料
·
驱动器
·
响应性高分子
·
可持续材料
✓ 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）