Coatings
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2022
·Vol. 12
·期 2
·166
·
IF 3.236
Guifeng Xiang,Jing Tu,Heng Xu,Jie Ji,Li Liang,Haozhe Li,Haoran Chen,Jingqing Tian,Xiaode Guo
In this study, we successfully manufactured polyurethane microcapsules containing isocyanate prepolymer as a core material for self-healing protection coatings via interfacial polymerization of a commercial polyurethane curing agent (Bayer L-75) and 1,4-butanediol (BDO) as a chain extender in an emulsion solution. With an optical microscope (OM) and a scanning electron microscope (SEM), the resulting microcapsules showed a spherical shape and an ideal structure with a smooth surface. Fourier transform infrared spectra (FTIR) showed that the core material was successfully encapsulated. Thermal gravimetric analysis (TGA) showed that the initial evaporation temperature of the microcapsules was 270 °C. In addition, we examined the influence of the concentration of the emulsifier and chain extender on the structure and morphology of the microcapsules. The results indicate that the optimal parameters of the microcapsule are an emulsifier concentration of 7.5% and a chain extender concentration of 15.38%. Microcapsules were added to the epoxy resin coating to verify the coating’s self-healing performance by a surface scratch test, and the results showed that the cracks could heal in 24 h. Furthermore, the self-healing coating had excellent corrosion resistance.Keywords:microcapsules;isocyanate prepolymer;coating;self-healing
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Zehua Zhuo,Rui Wang,Shaoyun Chen,Jianhong Gao,Cuifang Cai,Yanyu Zheng,Xiaoying Liu,Bo Qu,Qinghui Chen,Dongxian Zhuo
To advance the application of stereolithography (SLA) 3D printing in demanding environments, there is an urgent need for photopolymers that simultaneously achieve flame retardancy and structural robustness. In this study, a photosensitive branched prepolymer (TTH) with phosphorus-sulfur co-synergistic flame suppression and rigid heat-resistant heterocyclic ring structure was synthesized through molecular topology design, followed by its application in SLA printing. The branched structure endows TTH with substantial photosensitivity, which not only imparts superior 3D printing performance to the photosensitive resin but also enhances its mechanical properties and flame retardancy upon incorporation. The tensile strength, impact strength and storage modulus of photosensitive resin containing 80 wt% TTH are 187 %, 84 %, and 346 % higher than those of commercial photosensitive resin matrix (TTH-0). Meanwhile, the optimized resin achieved a limiting oxygen index (LOI) of 27.2 %, UL-94 V-0 rating, and 74 %/27 % reductions in peak heat release rate (PHRR)/total heat release (THR) compared to TTH-0. These results demonstrate that the TTH system combines branched molecular design with dual fire-safety reinforcement, positioning it as a high-performance candidate for functional 3D-printed components requiring stringent flame and mechanical compliance.
研究领域:
材料科学
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高分子化学
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消防安全
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增材制造
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 45
·49395
·
IF 2.52
Jianguang Huang,Peng Li,Weihong Hu,Ruikui Du,Guizhe Zhao,Zhi Wang
The toughness of polycyanate ester is improved by adding epoxy pre-polymer with varying molecular weights. The curing mechanism of epoxy prepolymer (PreEP) and cyanate ester (CE) is discussed based on differential scanning calorimeters and Fourier-transform infrared spectroscopy. The mechanical, phase separated structures and thermal properties of PreEP/CE are also evaluated. It is found that the molecular weight of PreEP can reach 1,800 when it is cured at 90°C for 45 min by using a set amount of polyetheramine. Meanwhile, by increasing the molecular weight of the prepolymer, the mechanical properties of PreEP/CE show increased first, and then decreased. 0.2 PreEP/CE has the highest bending strength and impact strength (105.8 MPa and 18.3 kJ·m −2 ). There are 26.7 and 114.5% higher than those of polycyanate ester, respectively. The tougher PreEP/CE is attributable to the phase-separated structures and the decrease in the cross-linked product (Oxazolidinone) in PreEP and CE. The method showed in this article provides a new way to improve the toughness properties of thermoset resin.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Pengcheng Zhu,Zhixin Liu,Jun Nie,Yong He
CO2-responsive and photopolymerizable prepolymers are designed and synthesized. Their good photopolymerization kinetics and reversible CO2 and N2 responses to a bulk state and in a solution are reported. Stepwise modulation is verified in template imprinting. Results reveal that stable and high-resolution patterns can be produced by imprinting liquid prepolymers in CO2 atmosphere, erased by warm heating, or retained permanently by chemical cross-linking through photopolymerization with the aid of a photoinitiator. By contrast, only blurry patterns are obtained in air.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL PAPERS
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2018
·Vol. 73
·期 2
·517-524
·
IF 0.963
Feng Yefeng,Deng Qihuang,Hu Jianbing,Peng Cheng,Wu Qin,Xu Zhichao
Abstract Ultraviolet (UV)-cured adhesives have attracted plenty of attention in the fields of health care and electronic components thanks to low energy loss and environment pollution. UV-cured adhesives bearing epoxy acrylate prepolymers have been extensively utilized, ascribed to low cost and high stability. However, the gel content of UV-cured adhesives has hardly been investigated in detail. The gel content has been found to strongly affect the mechanical properties and serving life of adhesives. We have found the strong composition dependence of adhesive performances of UV-cured adhesives before. To clarify the influencing factors of gel content in UV-cured adhesives containing epoxy acrylate prepolymers, in this work, a family of UV-cured adhesives with epoxy acrylate constituents have been elaborately designed and further fabricated. The influences of prepolymer kind, UV photoinitiator kind, UV photoinitiator concentration, reactive diluent concentration, feed style during preparing prepolymers and film thickness on gel weight fraction of cured adhesive films were deeply researched. This work might open the door to the large-scale preparation of promising high-performance UV-cured adhesives with a higher gel weight fraction based on regulating the formula. Graphical Abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2025
·
IF 6.2
Zhangheng Wang,Weihua Zou,Minghui Liu,Minggong Yu,Linghua Yao,Delin Sun,Xiaochuan Song,Xiaofeng Hao
Enhancing the stability and durability of superhydrophobic wood remains a significant challenge for its long-term application in various fields. This study presents a novel approach to developing durable superhydrophobic wood by regulating wood structure. The analyses of the mechanism revealed that Si-Ti@PDMS prepolymer infiltrated wood’s pores and cell walls, forming a highly cross-linked micro-nanoscale superhydrophobic coating extending from the exterior to the interior. The resulting superhydrophobic wood exhibited excellent hydrophobic characteristics on both its surface and various cutting surfaces. Furthermore, the water contact angles (WCA) measured on the various cut surfaces of the wood consistently exceeded 150°, thereby confirming its superhydrophobicity. Additionally, the water contact angles (WCA) at wood depth surfaces remained above 130°. This observation indicates that the non-wettability characteristic of the superhydrophobic wood extends from the surface to the interior. Consequently, even in the event of surface structural damage, the wood retains its robust hydrophobic performance. This study provides a theoretical foundation for regulating durable superhydrophobic wood, and it was beneficial to the efficient use of superhydrophobic wood in construction and furniture fields.
研究领域:
材料科学
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林业工程
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表面化学
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产品关联
DOI
高影响因子
POLYMER
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2024
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IF 4.1
Pengfei Chen,Yinyu Zhang,Ping Zhang,Xiuli Zhao,Yeping Wu
High-performance thermoplastics , such as polyether ether ketone (PEEK) and polyester sulfone (PES), are extensively utilized across various industries owing to their exceptional properties. However, their relatively low surface energy often leads to insufficient bonding strength when adhering PEEK or PES. Commonly used surface pretreatments, such as acid-base and plasma treatments, have drawbacks including the use of toxic acids and bases, complex procedures, and poor stability. In this study, we synthesized four catechol-functionalized prepolymers by reacting bisquinone A with dithiols or diamines in a 1:1 M ratio. These catechol-containing prepolymers were employed as surface primers, and the adhesion performance before and after primer treatment was examined using epoxy adhesive for bonding tests. Compared to untreated samples, the lap shear strengths of surface primed PEEK and PES were significantly enhanced by 181 % and 114 %, respectively. These results indicate that the synthesized prepolymers with catechol structures can effectively serve as adhesive primers for bonding.
研究领域:
材料科学
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生物仿生学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 46
·48219
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IF 2.188
Wan Li,Xingjiang Liu,Jinbi Wu,Linzhi Wu,Ailing Sun,Liuhe Wei
A new two-component modified polyurethane (PU) sealant was designed and synthesized for insulating glass. This sealant was designed based on a crosslinked reaction between a p -chlorophenol-blocked PU pre-polymer (Pre-polymer 2 ) in Component A and a poly-functional hyperbranched polyamine polymer (polyamide resin 300 # ) in Component B. During the synthesis of Pre-polymer 2 , Fourier transform infrared spectral analysis was used to track the process, and the optimal reaction time and temperature were 1.5 h and 80 °C, in the presence of 4, 4′-diphenylmethane diisocyanate (MDI). Different curing agents also used as deblocking agents were screened and it was found that polyamide resin 300 # was a good candidate for the curing reaction. In addition, the low-temperature curing rate was also improved by using dibutyltin dilaurate (DBTDL) and organobentonite together as a composite catalyst. Finally, the prepared two-component modified PU sealant for insulating glass was successfully used in an assembly line with good performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48219.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Yandan Zhang,Qin Tang,Ming Cai,Jiating Cai,Suifei Li,Xingmei Deng,Lingran Du,Guodong Ye,Chuanshan Xu,Yugang Huang
Developing an efficient yet uncomplicated method to achieve anticoagulant coatings on biomedical PU surfaces remains a challenge. In this research, we have proposed a very simple way to synthesize fluorinated urethane prepolymers (FPUs) that possess extended fluorocarbon side chains and terminal groups, innovatively using a new fluorinated chain extender and a fluorinated terminal capping agent. These FPUs have been utilized as additives to fabricate biomedical PU blends (BPUB). Incorporating a minimal quantity of FPUs, as little as 2.5 %, bestows BPUB with exceptional capabilities to resist protein and platelet adhesion, which can further prevent platelet activation, facilitated by the self-migrating nature of the fluorocarbon chains toward the film's upper surfaces, as substantiated by contact angle measurements and XPS . DSC and TG analysis indicate that the addition of FPUs marginally affects the thermal stability of the BPUB films, yet it reduces the glass transition temperature of the PUs. Remarkably, the BPUB films demonstrate enhanced degradation resistance to physiological solutions, exhibit excellent hemocompatibility , and maintain extremely low cytotoxicity levels. Thus, the FPUs present themselves as highly encouraging candidates for the development of anticoagulant coatings on biomedical polymers .
研究领域:
生物材料
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医学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 32
·e52478
·
IF 3.057
Yuhao Liu,Ying Lin,Yunsong Wang,Kangning Wu,Bin Cao,Liming Wang
To improve the toughness and hydrophobic property of the cycloaliphatic epoxy resin (CEP), which is vital to application in high voltage insulation of outdoor transmission lines, 3-aminopropyltriethoxysilane was used as the intermediate to prepare the silicone prepolymer by the interaction of the end groups of the CEP and the hydroxy-terminated polydimethylsiloxane. The results showed that the silicone prepolymer segments were self-assembled to form solid dispersion phases distributed uniformly in the CEP. The size of the dispersed phase gradually increased in CEP with more concentration of silicone prepolymer. The tensile strength and static contact angle of the CEP were simultaneously improved when content of the silicone prepolymer reached 10 phr. The tensile strength and static contact angle were mainly affected by the distribution of dispersed phase and by surface tension, respectively. With the increase of Si/C on the surface, surface tension decreased and tended to saturate. Due to small molecule migration, the CEP containing silicone prepolymer was also endowed with hydrophobic transfer properties. This paper affords a method to simultaneously enhance toughness and hydrophobic properties of CEP and deepens fundamental understanding of hydrophobic properties.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Fuping Bian,Xiaoquan Li,Jihe Zhao,Xuefeng Gui,Jiwen Hu,Shi Li,Shudong Lin
Ultraviolet (UV) photocuring technology has gained importance in crosslinking of polymers, as it allows fast curing rate, low energy consumption and no volatile organic compounds (VOCs). However, the photopolymerization of very thick films and in shadow areas where the light penetration is inhibited (e. g. in filled, pigmented, dispersed samples) remains a huge challenge. As reported herein, a simple hydrosilylation reaction was employed to synthesize epoxy-based silicone prepolymers . Firstly, the structures of the synthesized epoxy-based silicone prepolymers were characterized by Fourier-transform infrared (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy techniques, thus confirming the successful synthesis of these prepolymers. The epoxy group of prepolymers could be crosslinked under UV irradiation , and its silicone methoxy group (-SiOCH 3 ) was condensed under moisture ambient, so as to acquire both thick coatings and pigmented coatings due to the dual-curing approach. Moreover, water droplets exhibit water contact angles between 103° and 108° on these coatings, and surface energies of the these coatings are from 25.27 to 22.67 mN/m. The transparency of these coatings is over 90%. They remain stable at temperatures reaching up to 332.2 to 344.8 °C, thus demonstrating that they have excellent heat resistance. The coatings exhibited good mechanical properties with a tensile strength >4.57 MPa. Finally, the coatings have good anti-smudge and anti-fingerprint properties, and the overall results show that these films have potential applications as anti-smudge coatings.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 20
·期 1
·321-331
·
IF 2.339
Bian Fuping,Li Xiaoquan,Zhao Jihe,Hu Jiwen,Gui Xuefeng,Li Shi,Lin Shudong
As described herein, a simple one-step hydrosilylation reaction was employed to synthesize alicyclic epoxy silicone prepolymers by using poly(dimethylsiloxane-co-methylhydrosiloxane) (PDMS-PHMS) with different hydrogen contents and 4-vinyl-1-cyclohexene-1,2 epoxide (VCHO) as precursors. The structures of the synthesized epoxy polysiloxane oligomer was characterized by Fourier-transform infrared (FTIR) and proton nuclear magnetic resonance ( 1 H-NMR) spectroscopy techniques, thus confirming the successful synthesis of the prepolymers. With the addition of an appropriate amount of cationic photoinitiator, the epoxy polysiloxane prepolymers undergo cationic polymerization under ultraviolet light irradiation and were quickly cured to yield series of epoxy polysiloxane resin films. The performances of these cured films were tested and characterized by various techniques such as UV transmittance, thermal weight loss analysis, and contact angle and pencil hardness measurements. The results revealed that the surfaces of these films were uniform and transparent, and these films had excellent heat resistance, acid resistance, hydrophobicity, and ink removal properties. In addition, the influence of the cycloaliphatic epoxy monomer content on the curing behavior and network performance is explored. This study reveals that the curing rate increases as the amount of grafted cycloaliphatic epoxy monomer is increased and that a denser crosslinking network provides the resultant film. Finally, the photocurable silicone material investigated herein is simple to prepare and has excellent performance, and has potential applications in the field of anti-smudge coatings.
研究领域:
材料科学
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化学工程
·
高分子化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）