PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Yuting Zou,Lingyu Li,Bin Tan,Yue Ma,Liang Fang,Chunhua Lu,Zhongzi Xu
Self-healing behavior of polymer coatings consists of two steps: crack closure and crack repair. Shape-memory effect, conformational transition of polymer chains, and water-induced flowability were reported on crack closure as the preliminary and necessary step. All of them, however, cannot achieve the trade-off between healing from wide damage and satisfied properties. Here, we prepared silane modified epoxy coatings, which achieved the self-healing of cracks with width of 300 μm upon heating and good mechanical properties. Furfurylamine (FA) and furfuryl glycidyl ether (FGE) were reacted with diglycidylether of bisphenol A to prepare oligomers with furan groups as side and terminal groups, which created reversible crosslinking bonds based on Diels-Alder reactions with maleimide groups from bis(4-maleimidophenyl)methane. (3-aminopropyl)triethoxysilane (APTES) was also involved to reduce the surface tension of coatings and to offer irreversible crosslinking bonds that ensured the coating stability during heating. We fully studied the effects of the ratio of APTES and FA (1:9, 2:8, 3:7, and 4:6) on the chemical structures, molecular weight, and thermal properties of oligomers, as well as the chemical structures, surface structures, mechanical properties of coating materials. By increasing the ratio of APTES and FA, the surface tension of the coating was gradually decreased until a critical ratio of 3:7. All coatings possessed similar and good mechanical properties. The self-healing behaviors were found to be dominated by the competition among shape-memory effect, surface tension driven flow, and viscosity, which were related to coating network structures. Thick coatings also facilitated the crack closure and healing performance. Compared with the coating without silane modification, the self-healing behavior was improved, the mechanical properties were maintained, and the anti-corrosion properties were deteriorated.
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DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Yongjian Lou,Zhongxiang Zhao,Zhiwei Chen,Zenghui Dai,Feiya Fu,Yanyan Zhang,Lei Zhang,Xiangdong Liu
High melting temperature and viscosity of most benzoxazine monomers are challenging problems in processing, especially for preparation of composites. The present work introduces the “reactive diluent” concept to improve the processability of benzoxazines. A benzoxazine monomer having a vinyl group is first synthesized from 4-vinylguaiacol (4VG), and then dissolved in a reactive diluent, styrene or methyl methacrylate . The resulting solutions show low viscosity (less than 2 mPa s), and exhibit high reactivity during free radical and ring-opening polymerizations, successively. Furthermore, the solutions are applied to fabricate cotton fabrics reinforced composites. Both of them possess high glass transition temperature and excellent mechanical properties , which have potential applications as structural components.
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高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2012
·Vol. 51
·期 5
·1205-1214
·
IF 3.919
Xinjian Cheng,Cheng Peng,Daohong Zhang,Shuzheng Liu,Aiqing Zhang,Hui Huang,Jiansheng Lian
Novel cross-linked polyphosphazenes with remendable capacity have been synthesized through the Diels-Alder reactions. Their structure and properties were characterized by NMR, FT-IR, GPC, DSC, TGA SEM, and polarizing microscope. The process of Diels-Alder reaction (D-A reaction) and retro-Diels-Alder reaction (retro-D-A reaction) have been investigated by FT-IR, UV, and DSC. The cross-linked polyphosphazenes exhibited remendable capability only need a thermal treatment when they were cut by blade, any other treatments such as additional monomer or catalyst, surface treatment or pressure were not needed. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2017
·
IF 2.843
Xiaobin Shen,Xiaoqing Liu,Jinyue Dai,Yuan Liu,Yajie Zhang,Jin Zhu
A biobased epoxy 2,5-bis[(2-oxiranylmethoxy)methyl]-furan (BOF) together with its petroleum-based analogues, 1,4-bis[(2-oxiranylmethoxy)methyl]-benzene (p-BOB) and 1,3-bis[(2-oxiranylmethoxy)methyl]-benzene (m-BOB), have been synthesized. After their chemical structures were identified by nuclear magnetic resonance (1H NMR and 13C NMR), they were cured by the petroleum-based 4,4′-diaminodiphenylmethane and biobased 5,5′-methylenedifurfurylamine, respectively. Thermal and mechanical properties of the cured resins were investigated by differential scanning calorimetry, thermogravimetric analyzer and dynamic mechanical analysis. Especially, hydrogen bonding interactions in the different cured systems were studied by Fourier transform infrared spectroscopy. Based on the structure–properties relationship investigation, it could be concluded that it was the hydrogen bonding interaction playing a key role in determining the thermal properties of the furan-based epoxy resins.
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DOI
高影响因子
POLYMER
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2017
·
IF 3.684
Changhong Lin,Dekun Sheng,Xiangdong Liu,Shaobin Xu,Fance Ji,Li Dong,Yan Zhou,Yuming Yang
We developed a polyurethane material has an excellent self-healing ability as well as mechanical strength . This system was achieved based on dual-crosslinked Diels-Alder (DA) covalent bonding reaction. The first cross-linking point is realized by the DA bonding of polyurethane chain. Because of grafted maleimide group, the maleimide functionalized GO (mGO) sheets can be regarded as analogous cross-linker and provide the second cross-linking point in the system. We investigated and compared the effects of as-produced GO and mGO loading and maleimide functionalization on the mechanical properties and healing efficiency of composites. As a result, compared with those of the pure polyurethane and composites filled with the GO, such maleimide functionalization is found to effectively improve the compatibility between mGO and polymer matrix , increasing mechanical properties and healing efficiency of polyurethane composites. The mechanical properties and healing efficiency of polyurethane can be tuned readily by varying mGO concentration. The healing efficiencies were up to 99% for the nanocomposite containing mGO. These results confirm maleimide functionalization improved dispersion and interfacial interaction between the fillers and the polyurethane matrix.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 104
·102406-102412
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IF 3.289
Shuchen Shi,Xiaowei Zhao,Qian Wang,Huiting Shan,Ying Xu
A novel scale and corrosion inhibitor, polyaspartic acid/furfurylamine graft copolymer (PASP/FA), was synthesized using maleic anhydride, urea, and furfurylamine (FA) as raw materials. The structure of PASP/FA was characterized by 1H NMR. PASP/FA exhibits excellent scale inhibition performance at low concentration, and its overall performance was significantly improved as compared with polyaspartic acid. The inhibition efficiency of PASP/FA was close to 100% against CaCO3 with 1 mg L−1 inhibitor at 80 °C and reached up to 100% against CaSO4 at 70 °C when dosage of the inhibitor was 5 mg L−1. The best inhibition efficiency against Ca3(PO4)2 at 80 °C was about 96% when the concentration of inhibitor was 10 mg L−1. The maximum corrosion inhibition efficiency at 45 °C was as high as 30%, when 16 mg L−1 of inhibitor was adopted. When the temperature was 50 °C and a pH = 9, the best dispersion capacity for Fe2O3 (according to 69% of transmittance) was reached when 48 mg L−1 of inhibitor was applied in the tested system. The structure and morphology of CaCO3 and CaSO4 were observed by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD).
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高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Sipei Zhao,Changlu Zhou,Zhong Xin
Bacterial invasions pose major challenges to various aspects of human production and daily life, continuous exploration of antibacterial agents and the design of effective antibacterial materials are urgently needed. Herein, based on the diverse biological activity of oxazine compounds, a biobased benzoxazine monomer (PY-f) was successfully synthesized using renewable furfurylamine and pyrogallol as raw materials. The PY-f monomer exhibits excellent antibacterial activity, the relationship between its structural changes during the ring-opening reaction and antibacterial properties was discussed in detail. The experimental results indicate that its antibacterial activity is weakened with the ring-opening ratio of the oxazine ring. It is speculated that the antibacterial mechanism of PY-f is the synergistic effect of the electron-withdrawing oxazine ring and furan ring. Moreover, incorporating PY-f into polyethylene (PE) to create antibacterial polymer materials reveals that the PE/PY-f composites exhibit outstanding antibacterial properties within the processing temperature range of 140–190 °C, along with long-term antibacterial potential. Notably, the evolution of the molecular structure of PY-f during thermal processing brings simultaneous improvements in toughness and modulus to modified PE, as well as interesting surface hydrophilic and hydrophobic conversion. This study validates the effective antibacterial properties of benzoxazines and provides a feasible strategy for the design and development of antibacterial polymers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ruiyu Yuan,Yi Yang,Zhenhao Yao,Kan Zhang
In this study, we used vanillin and furfurylamine from renewable resources as starting materials and successfully synthesized an innovative derivative of bisbenzoxazine (MH-fa) using the Mannich reaction. We characterized the chemical structure of the newly synthesized bisbenzoxazine compound using high-resolution mass spectrometry (HR-MS) technology. The results of nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy analysis (FT-IR) confirmed the successful synthesis of the target compound. The synthesis of the benzoxazine copolymer (MH-fa-co-DDM-BMI) was achieved by leveraging the reversibility of the Diels–Alder reaction between the MH-fa monomer and 4,4′-bismaleimide diphenylmethane (DDM-BMI). In addition, the investigation into the polymerization behavior of benzoxazine monomer and its corresponding main-chain copolymer was conducted employing differential scanning calorimetry (DSC) along with in situ FT-IR. We studied the thermal stability and combustion performance of two samples using thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC). The results revealed that the bio-based bisbenzoxazine exhibited excellent heat resistance and flame retardancy. Specifically, poly(MH-fa) exhibits a T d10 value of 350°C and a Y c value of 62.3% at 800°C. Furthermore, the material exhibits an extremely low heat release rate (20.4 J g −1 K −1 ), highlighting its potential applications in the field of high-efficiency flame retardant materials.
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高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Hao-Xin Niu,Tian-Mo Yang,Xin Wang,Ping Zhang,Wenwen Guo,Lei Song,Yuan Hu
Epoxy thermosets are used in many fields because of their outstanding properties. However, commercial epoxy thermosets are flammable, so epoxy resins with excellent flame retardant properties need to be prepared. In recent years, carbon fiber epoxy composites have been widely used in aerospace and other high-tech fields due to their high strength and excellent performance. With the increased use of carbon fiber epoxy composites, the recycling of carbon fibers is an important issue. Herein, a bio-based epoxy vitrimer (TVEP/DFDA) containing a Schiff base structure was successfully prepared by utilizing vanillin, tyramine and furfurylamine. Moreover, carbon fiber epoxy composites (CF-TVEP/DFDA) were successfully prepared. The TVEP/DFDA composite has better mechanical properties than DGEBA/DDM and excellent flame-retardant performance. The limiting oxygen index (LOI) of TVEP/DFDA was 28.5%, and TVEP/DFDA achieved a UL-94 V-0 rating. Heat hazards and smoke hazards are sources of danger in fires. According to the cone calorimetry test, compared with those of DGEBA/DDM, the heat release rate, total heat release and total smoke production of TVEP/DFDA decreased by 73.9%, 52.6% and 56.6%, respectively. The significantly reduced heat and smoke production indicate that TVEP/DFDA has a lower combustion intensity and better fire safety than DGEBA/DDM. CF-TVEP/DFDA also exhibited excellent flame-retardant performance, with a high LOI of up to 45% and a UL-94 V-0 rating. However, the CF-DGEBA/DDM cannot pass the vertical burning test. TVEP/DFDA has excellent stability under different solvents and can be degraded under acidic conditions. This work describes a strategy for recycling carbon fibers by immersion in a hydrochloric acid solution. The recycled carbon fibers exhibit surface morphologies, chemical structures and mechanical properties similar to those of virgin carbon fibers.
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Naipin Chen,Fang Wang,Jiajun Wang,Jiaqi Liu,Xinbao Zhu
It has been urgent that timely repair of microdamage generated during long-term service of metal insulation coatings. Hereby, we developed a novel self-healing dual-chamber microcapsule with particle size about 5 μm, in which furfuryl amine modified polystyrene-acrylic acid (PSAF) as shell material and photosensitizer Carbon dots (CDs) as Pickering emulsifier. The synthesized materials were characterized analytically, FTIR and DSC demonstrated the simultaneously existence of healing agent and curing agent in the resultant dual-chamber microcapsule. Experiments also showed microcapsules exhibited satisfying storage stability more than 20 d at room temperature as well as thermogenesis effect that allowing temperature of epoxy composite materials raised to 50 °C in 60s and fractures to be effectively minimized in time. The scratch tensile measurement results demonstrated that epoxy resin composites incorporated with 2 wt% microcapsules exhibited the optimal strength self-healing efficiency, modulus, toughness and anti-fatigue performance. Furthermore, surface characterization and EIS analysis also confirmed the long-lasting healing effect of EP/MC 2% complex coating with outstanding corrosion resistance . Therefore, the photothermal responsive dual-chamber microcapsule designed in this work has application as self-healing material especially epoxy anti-corrosion coating.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Rui Yang,Richie Yang,Shengfu Yang,Kan Zhang
Producing thermosetting polymers using natural renewable resources has attracted great attention due to the requirement of sustainable development for human beings. Herein, we represent our design of a novel biobased thermosetting resin (KAE-fa) containing a polymerizable oxazine ring and a furan group derived from renewable kaempferol and furfurylamine. The distinctive presence of rich intra- and intermolecular hydrogen bonds within KAE-fa imparts it with thermal latent polymerization characteristic, long shelf life, and exceptional high performance of its resulting polybenzoxazine. Notably, the resulting thermoset, poly(KAE-fa), demonstrates a substantially high glass transition temperature (Tg) of 304 °C, an impressively elevated char yield (in N2) of 63%, and an extraordinarily low heat release capacity of 10.12 J·g–1·K–1. In addition, KAE-fa has also been utilized to fabricate a carbon fiber-reinforced composite [CF/poly(KAE-fa)]. Employing this newly obtained high-performance bioresin as the matrix, CF/poly(KAE-fa) exhibits a remarkable property enhancement. For instance, CF/poly(KAE-fa) shows 108, 28, and 82.7% increases in Tg, tensile strength, and Young’s modules (room temperature), respectively, compared with the carbon fiber-reinforced BA-a composite [CF/poly(BA-a)]. These advantages underscore the great potential of using renewable bioresins for developing both high-performance thermosets and composites with key applications spanning from transportation to aerospace.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55920
·
IF 2.7
Yi Yang,Yin Lu,Kan Zhang
In this study, we designed and synthesized a series of norbornene-furan functionalized benzoxazine monomers ( HPAP-fa , HPAMP-fa , and HPTM-fa ) by regulating the bridge length in benzoxazine structure in order to improve the comprehensive performance of norbornene-furan functionalized benzoxazine system. This research systematically examined the impact of flexible segments on the structural information, polymerization behaviors, thermal stability, and flame retardancy of resulting polybenzoxazines. Initially, the structural characteristics of benzoxazine were confirmed through nuclear magnetic resonance, Fourier-transform infrared (FT-IR), and HR-MS. Subsequently, the polymerization mechanisms of each benzoxazine monomer were investigated utilizing differential scanning calorimeter and in situ FT-IR analyses. Finally, the thermal stability and flame-retardant properties were investigated by TGA and micro-combustion calorimetry measurements. Consequently, HPAP-fa exhibited the lowest polymerization temperature and the corresponding poly(HPAP-fa) showed very high thermal stability ( T d5 of 392°C and T d10 of 437°C) as well as excellent flame retardancy (HRC of 83.7 J g −1 K −1 ), which shows a significant improvement compared to poly(HPTM-fa) . As a result, the modulation of bridge segments within the monomer represents a viable approach towards enhancing the holistic efficacy of norbornene-furan functionalized benzoxazine systems.
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高影响因子
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