POLYMER
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2019
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IF 3.771
Changhong Lin,Dekun Sheng,Xiangdong Liu,Shaobin Xu,Fance Ji,Li Dong,Yan Zhou,Yuming Yang
Graphene and modified Graphene often can be used as effective reinforcer or cross-linker in self-healing materials. However, the influence of fillers sheets size on the self-healing materials remained unclear. In this report, we investigate the effect of different graphene oxide (GO) sheets size in the properties of self-healing Polyurethane . The different sizes of graphene oxide (GO) were prepared from various sizes of graphite via the improved Hummers' method. Furthermore, the corresponding maleimide functionalized GO (mGO) sheets were synthesized from maleimide modification processing. The X-Ray photoelectron spectroscopy (XPS) analysis shows that the smaller size GO, the higher oxidation and functionalization. We systematically investigated the influence of size GO and mGO on the mechanical and self-healing performance of Polyurethane/Graphene Oxide (PG) and Polyurethane/maleimide modified Graphene Oxide (PM) with the dynamic thermal reversible Diels-Alder bonds. The results show that GO sheets in smaller size produce an advantage on the mechanical and self-healing behavior. Moreover, the PM nanocomposites exhibited superior mechanical and self-healing properties compared to PG nanocomposites at the same loading.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 136
·期 18
·47352
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IF 2.188
Jianan Xu,Zhiying Li,Bao Wang,Fengya Liu,Yudong Liu,Fengqi Liu
Poly(ethylene glycol) diglycidyl ether-furfurylamine (PGFA) containing pendant furan was synthesized, and a series of crosslinked materials with thermally reversible capacity were synthesized through a furan/maleimide Diels–Alder (DA) reaction between PGFA and bismaleimide (BMI). The kinetics of the PGFA/BMI DA reaction were studied by Fourier transform infrared spectroscopy (FTIR). The reaction conversion rate, the reaction rate constant, and the energy of the DA reaction at different temperatures were calculated. In addition, the retro Diels–Alder (rDA) reaction was studied via 1 H-NMR, differential scanning calorimetry, and in situ FTIR. The occurrence of the retro DA reaction has been characterized clearly. Finally, the mechanical properties of the materials were obtained by dynamic mechanical and tensile tests. The storage modulus decreased obviously when the temperature reached over 90 °C, which proved that the materials were thermally reversible at high temperature. By changing the proportion of the crosslinking agent BMI, the best-performing materials were obtained, and the properties of the materials were basically unchanged after recycling. Thus we have obtained an excellent reusable material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47352.
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高影响因子
POLYMER TESTING
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2019
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IF 2.943
Yubin Li,Zhijian Yang,Jianhu Zhang,Ling Ding,Liping Pan,Chuan Huang,Xue Zheng,Chengcheng Zeng,Congmei Lin
Self-healing polymeric materials have attracted considerable interests due to the capability of healing the cracks generated in functional materials autonomously, resulting in improved reliability and life cycle. This paper is intended to develop a self-healing polymeric binder for energetic composites by incorporation of reversible covalent bonds into polyurethane . A novel polyurethane was synthesized from NCO-terminated prepolymer with furfuryl amine, and cross-linked with bismaleimide via Diels-Alder (DA) reaction. The chemical structures of the intermediates and products of Diels-Alder polyurethane (DAPU) were firstly confirmed by nuclear magnetic resonance ( 1 H NMR), Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). Then, the thermal reversibility and the self-healing performances of DAPU based energetic composites were systematically studied by DSC, polarizing optical microscopy (POM) and tensile testing . All the results showed that the as-prepared DAPU had high self-healing efficiency and remarkable mechanical performance, providing potential applications as a promising self-healing material in repairing the cracks generated in energetic composites.
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高影响因子
Materials Today Communications
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2019
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IF 1.859
Shitong Ren,Xiangyan Miao,Weibo Zhao,Shaoyue Zhang,Wei Wang
Lowering the curing temperature has always been one of the research focuses of polybenzoxazine. In this work, a fully bio-based phenolic hydrogen containing benzoxazines (PF) with high polymerization activity was conveniently synthesized from pyrogallol, furfurylamine and paraformaldehyde through a modified route. The structure of PF was confirmed by FT-IR and NMR. PF was used as a latent catalyst for the traditional bisphenol A/aniline-based benzoxazine (BA), and thermosets with different PF contents were prepared. The influence of PF on the polymerization temperature, thermal and mechanical properties , thermal stability and flame retardancy were symmetrically studied through DSC , DMA and TGA , respectively. The results showed that both the onset exothermic temperature ( T onset ) and exothermic peak temperature ( T p ) decreased obviously with the increase of PF content. The glass transition temperature ( T g ) and crosslinking densities of the thermosets positively correlated with the PF content, while the storage modulus showed a maximum when PF content was 2.5 wt%. The thermal degradation temperatures and char yields of the thermosets were also improved continuously as PF content increased. In brief, by adding a small amount of PF (≤10 wt%), the overall performance of BA resin could be effectively modified.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Na Teng,Shimin Yang,Jinyue Dai,Shuaipeng Wang,Jun Zhao,Jin Zhu,Xiaoqing Liu
To fulfill the principles of green chemistry, renewable magnolol and furfurylamine were taken to synthesize benzoxazine under microwave irradiation using poly(ethylene glycol) (PEG) as the solvent. The reaction was monitored by the yield of target compound under varied conditions. Only in 5 min, the yield of target benzoxazine monomer (M-fa) could be high up to 73.5% in PEG 600 system, indicating the desired advantage of microwave irradiation for benzoxazine synthesis. After the chemical structure of M-fa was confirmed, its polymerization behavior, processability, and thermo-mechanical properties were carefully evaluated. The cured resins presented a high glass transition temperature of 303 °C and exceedingly good thermal stability with 5% and 10% weight-loss temperature higher than 440 and 463 °C, respectively, and a char yield of 61.3%. In addition, M-fa demonstrated viscosity lower than 1 Pa·s during the temperature range from 100 to 194 °C, which indicated its good processability. This work provided us a strategy for the synthesis of high bio-based content high-performance thermosets under environmental-friendly conditions, that is, microwave-assisted heating method and green solvent.
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Molecular Catalysis
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2019
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IF 2.938
Chenglong Dong,Hongtao Wang,Haochen Du,Jiebang Peng,Yang Cai,Shuai Guo,Jianli Zhang,Chanatip Samart,Mingyue Ding
Furfurylamine converted from biomass-based platform molecules furfural was proven a significant intermediate in the synthesis of different valuable compounds. The combination of Ruthenium with HZSM-5 was acted as an excellent selective and reusable catalyst for the reduction amination of furfural with environmentally friendly ammonia and hydrogen. Incorporation of Ru species into HZSM-5 had a significant enhancement to the acid sites of Ru/HZSM-5. The Ru/HZSM-5(46) catalyst with optimized acid sites and interaction of the Ru-O-Al bond displayed an excellent catalytic performance, producing 76 % yield of furfurylamine at only 15 min, and could be recycled five times without loss of performance. Synergistic effect between RuO 2 and metallic Ru in the Ru/HZSM-5 catalyst facilitated the reduction amination of furfural.
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高影响因子
CELLULOSE
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2019
·Vol. 27
·期 1
·561-573
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IF 3.917
Ma Yue,Zou Yuting,Zhang Zhen,Fang Jiaojiao,Liu Wenting,Ni Yaru,Fang Liang,Lu Chunhua,Xu Zhongzi
Abstract Luminescent and hydrophobic textile coatings with recyclability and self-healing capability against both chemical and physical damage were prepared, which present multi-functions and long service life cycles. The applications in self-cleaning, oil-water separation, and anti-counterfeit technology were successfully demonstrated. The coatings can be easily created onto different fabrics including cotton cloth, filter paper, and chemical fabric. A rare earth organic complex of SmTTAPhen(NO 3 ) 3 (STPN), silane modified epoxy oligomer, and bis(4-maleimidophenyl)methane (BMI) provide luminescence, hydrophobicity, as well as recyclability and self-healing capability, respectively, to the coatings. More specifically, high transparency but high luminescence were achieved due to the good dispersion of STPN in coating matrix, resulting from the hydron bonding between nitrate groups from STPN and hydroxyl groups from epoxy oligomer. Silane modification facilitated the accumulation of Si–O bonds on the free-surface of the coating, which offers hydrophobic features. The introduction of reversible Diels-Alder reactions provided the self-healing capability and recyclability. Upon heating using an electronic iron, the hydrophobicity can be recovered from physical or chemical damage to the coatings. Besides, the coatings on abandoned fabrics can be recycled and reused to a new bare fabric. We believe that the concept and coating materials are useful to further expand the areas of smart and multi-functional coatings with long service life. Graphic abstract
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Zhongxiang Zhao,Yongjian Lou,Zenghui Dai,Feiya Fu,Xiangdong Liu
To improve processability of benzoxazine monomer in preparation of composites, a water-slurry strategy was examined using several laboratory-scale instances. The water slurries were fabricated by mixing solid resin powder of 3-furfury-8-methoxy-3,4-dihydro-2H-1,3- benzoxazine with water and one type of filler particle, i.e., calcium carbonate, montmorillonite, or hollow glass beads. Experimental data show that approving liquidity can be achieved when more than 180 phr of water was mixed in the solid mixtures containing the resin powder and 100 phr of solid filler. The biobased composite prepared using the optimized condition exhibits outstanding mechanical properties and antifatigue performance as the composites prepared via solvent method. This water-slurry approach provides an environmentally friendly strategy to manuscript benzoxazine composites, offering benzoxazine with more promising applications in many industries such as building, wind energy, aircraft, and automobile.
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高影响因子
MACROMOLECULES
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2018
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IF 5.914
Xiaobin Shen,Lijun Cao,Yuan Liu,Jinyue Dai,Xiaoqing Liu,Jin Zhu,Shiyu Du
The formation of intra- or intermolecular hydrogen bonding and their influences on polybenzoxazine’s properties were investigated after the model benzoxazine monomers (o-AB-fbz, o-AF-fbz, o-AP-fbz, p-AB-fbz, p-AF-fbz, p-AP-fbz) were synthesized. Because of the different electron-donating abilities of bridging units (benzene, furan and pyridine) in isophthalic acid (IPA), 2,5-furandicarboxylic acid (2,5-FDCA) and 2,6-pyridinedicarboxylic acid (2,6-PDCA), the strength of intramolecular H-bonding involved with the oxygen atom in oxazine ring in o-AB-fbz, o-AF-fbz and o-AP-fbz followed the order of o-AB-fbz > o-AF-fbz > o-AP-fbz, and the strength of the overall H-bonding was arranged as follows: o-AB-fbz < o-AF-fbz < o-AP-fbz. While more intermolecular H-bonding was formed in p-AB-fbz and p-AF-fbz as well as p-AP-fbz. DSC and FT-IR results discovered the relationship between the H-bonding involved with the oxygen atom in oxazine ring and the curing activities of benzoxazines. After curing reaction, the cured systems showed varied glass transition temperature (Tg), and the influence of H-bonding on Tg was revealed by in situ FT-IR analysis. Molecular dynamics (MD) simulation was also applied to investigate the properties of synthesized polybenzoxazines and similar results were obtained. Not only the formation of H-bonding but also their effects on both the curing behaviors of benzoxazine monomers and the thermal properties of cured resins were systematically investigated, which would help us understand polybenzoxazines more deeply and might be a guideline for improving their comprehensive properties only by manipulating the H-bonding.
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CONSTRUCTION AND BUILDING MATERIALS
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2018
·
IF 3.485
Libang Feng,Zhengyang Yu,Yaohui Bian,Yanping Wang,Yanhua Zhao,Liuxiaohui Gou
Materials can suffer from different damages in actual application. Consequently, diversified failure modes can be caused, while different failures may have unalike repairing effect. Thereupon, it is quite important of exploring the effect of failure modes on the repairing behavior of self-healing materials. Herein, a kind of thermoplastic polyurethane containing Diels-Alder bonds (PU-DA) has been synthesized successfully. Based on the dual actions of thermo-reversible Diels-Alder reaction and molecular movement, the as-prepared polyurethane exhibits excellent self-healing performance. The repairing behavior of polyurethanes with different failure modes has been investigated both qualitatively and quantitatively. Results show that polyurethanes with various cracks can be repaired. However, PU-DA film with shallower crack exhibits a high healing efficiency as compared to that with deeper crack at the similar heat treatment. Meanwhile, polyurethane has multiple healing capability and cracks can be caused and repaired repeatedly. Additionally, PU-DA fragments can recombine together as a whole even after destroyed by tearing, indicating PU-DA also exhibits outstanding reprocessing capability. The research can lay foundation for realizing the favorable repairing of various failure modes, and further promote self-healing materials and technology applied into practice.
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ChemSusChem
·
2018
·Vol. 11
·期 18
·3175-3183
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IF 7.411
Jinyue Dai,Na Teng,Yunyan Peng,Yuan Liu,Lijun Cao,Jin Zhu,Xiaoqing Liu
Graphical Renewable polymers : A biobased benzoxazine resin (Dz-f) with excellent thermal properties was synthesized from daidzein and furfurylamine by using a microwave heating method. It was then cured and its thermal properties evaluated by differential scanning calorimetry (DSC), TGA, and dynamic mechanical analysis (DMA; see figure). A biobased benzoxazine resin (Dz-f) demonstrating excellent thermal properties was synthesized from daidzein and furfurylamine by using a microwave heating method. The chemical structure of synthesized benzoxazine monomer was identified by FTIR and NMR ( 1 H and 13 C NMR) before it was cured and its thermal properties evaluated by differential scanning calorimetry (DSC), TGA, and dynamic mechanical analysis (DMA). The cured resin p(Dz-f) exhibited a glass transition temperature ( T g ) of 391 °C, a very high char yield of 68.7 %, and outstanding thermal stability; the T g value obtained was the highest thermal stability value ever reported for polybenzoxazine with a high biobased content. Moreover, Dz-f demonstrated a satisfying processability, which was rare for the high-performance thermosetting resins. This work provided us with a new strategy for the preparation of high biocontent resins with excellent thermal properties. In addition, the combination of biobased feedstocks with a microwave-assisted heating method as well as the potential application of this approach in high-end fields might perpetuate remarkable progress towards the sustainable development of the polymeric industry.
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PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 135
·期 6
·3153-3164
·
IF 2.209
Chen Xi,Wang Jun,Huo Siqi,Yang Shuang,Zhang Bin,Cai Haopeng
Novel phosphorus-contained Schiff base (PSF) is synthesized by furfurylamine, salicylaldehyde and 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide and is incorporated with CE to prepare a flame-retardant cyanate esters. The thermal property, flame-retardant property and dielectric property are tested. The results show that the incorporating of PSF leads to more incomplete combustion and results in increase in of char yield and flame-retardant property. The LOI value of 35% and UL-94 V-0 rate have been achieved for 1.0% of phosphorus content. The dielectric constants and dissipation factors of CE-PSF increase with the promotion of phosphorus contents and slightly lower than neat CE for forming more s-triazine network with the catalysis of PSF. CE-PSF is an alternate of traditional cyanate ester resin to prepare the matrix material of printed circuit board.
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危险品化学品经营许可证（带存储）