Coatings
·
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
·
化学工程
✓ 已验证
产品关联
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
·
高分子化学
·
消防安全
·
增材制造
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
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
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
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
·
林业工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
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
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 46
·48219
·
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
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 52
·29583-29588
·
IF 2.936
Rongping Ni,Bin Qian,Chang Liu,Xiaofeng Liu,Jianrong Qiu
Compared with parts fabricated via traditional methods, such as injection or compression molding, polymeric parts produced by 3D stereolithography (SLA) have poorer mechanical properties. Here, we demonstrate a cross-linking strategy used in the coating field to attain long chains for resin pre-polymerization to obtain final resin parts which can expand the application of SLA. Isophorone diisocyanate (IPDI), 2-hydroxyethyl methacrylate (HEMA) and polyethylene glycol (PEG)-based prepolymer have long chains, making it easier for them to form dense structures. However, the prepolymer has high viscosity and can solidify in the absence of a laser. Thus, three kinds of adjuvants were added to dilute the prepolymer to make the slurry suitable for 3D-printing. Slurries were cured with different laser powers and scanning speeds. Diluents are found to affect the curing properties differently. With the diluent 2-hydroxyethyl acrylate added into the prepolymer, shrinkage of printed parts is lower than 1.3%. With the diluent ethylene glycol monophenyl ether, the density range of printed parts is between 1.187 g cm−3 and 1.195 g cm−3, which is higher than that of commercial PVC and PET. The three resins vary in density and hardness within a small range when the scanning speeds change. A relatively flat surface, high density and hardness can be obtained when the laser power is at 195.5–350 mW. Resin with this cross-linking strategy can expand the underutilized stereolithography's application from prototyping to actual parts by producing more functional components with excellent performance.
研究领域:
材料科学
·
3D打印技术
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 100
·82429-82437
·
IF 3.84
Yi Xu,Qichao Ran,Chao Li,Rongqi Zhu,Yi Gu
In this paper, the prepolymerization of acetylene-functional benzoxazine was carried out by using nickel acetylacetonate hydrate/triphenyl phosphine as a catalyst at a low temperature. By this method, the reaction heat of acetylene polymerization was partially released and no ring-opening polymerization of benzoxazine occurred. After that, the prepolymer was cured stepwise to obtain the cured product according to a traditional curing process. As a comparison, another cured product was directly obtained from acetylene-functional benzoxazine by the traditional method without prepolymerization. The curing behaviors and the thermal properties of these two polybenzoxazines were investigated and compared by FTIR, DSC, DMA, and TGA. Their thermal decomposition behaviors were further studied by TGA-FTIR, Py-GC/MS, and SEM. The results show that the catalytic prepolymeriztion makes the whole curing process milder and more controllable in a broader processing window. Furthermore, more crosslinked-polyacetylene structures and benzene from the catalytic prepolymerization improve the thermal stability of the polybenzoxazines. Additionally, less amine compounds were detected in the prepolymerization system during the thermal decomposition process and the appearance of the residue was stable and controllable after pyrolysis.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
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
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yinming Fan,Guolong Zeng,Xiaoguo Ma
This work systematically investigated the effects of prepolymerization on the property of multi-templates surface molecularly imprinted polymer (MIP), which was utilized to quickly and simultaneously separate and detect six sulfonamides (sulfadiazine, sulfathiazole , sulfamerazine , sulfamethazine , sulfamethoxazole and sulfadoxine) in real waters. The MIPs were prepared using the six sulfonamides as the templates, mesoporous silica supported onto the surface of magnetic graphene oxide as the carrier and 4-vinylbenzoic as the functional monomer , with and without prepolymerization of templates with functional monomer. The preparation and adsorption conditions were optimized. It was found that the adsorption capacities of the selected six sulfonamides on the MIP (pre) prepared with prepolymerization were apparently higher than those on the MIP (no pre) synthesized without prepolymerization. Subsequently, the MIPs were utilized as adsorbents for SPE of these sulfonamides, and coupled with high performance liquid chromatography (HPLC) for the determination of sulfonamides. The developed analytical method showed outstanding applicability for the detection of trace sulfonamides in real water samples. The spiked recoveries and relative standard deviations (RSDs) of the six sulfonamides using MIP (no pre) and MIP (pre) were 73.34–99.43% and 87.37–102.34%, 2.28–7.77% and 3.18–6.49%, respectively.
研究领域:
环境科学
·
分析化学
✓ 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）