POLYMER JOURNAL
·
2024
·
IF 2.3
Wang Wenda,Wang Qiang,Wang Ping
Acrylic acid (AA)/methyl acrylate (MA)-modified starch was prepared via a catalytic process involving horseradish peroxidase (HRP)/acetylacetone (ACAC) as an initiation system. The structural analysis results demonstrated that the grafting of AA and MA onto starch was successful. Furthermore, the impact of the grafting reaction conditions on the grafting effect and the characteristics of the resulting grafted products were also examined. The results demonstrated that AA and MA were successfully grafted onto starch. The optimal conditions for starch grafting with AA/MA were identified as a reaction time of 4 h, an HRP enzyme concentration of 12 U/mL, a total monomer/starch ratio of 4:6, and a molar ratio of AA/MA feeding of 3:7. The viscosity and viscoelasticity of the modified starch slurry increased, and the film-forming property was enhanced. Compared with the original starch film, the modified film markedly increased the flexibility and tensile strength. Furthermore, an increased acrylic acid content maintained the original hydrophilicity of the modified starch film.
研究领域:
材料科学
·
生物催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 20
·e55383
·
IF 2.7
Zi-Li Zhang,Bo Yang,Ya-Kun Xie,Yu Zhao,Qi-Yao Feng,Li-Juan Yin,Zhi-Min Dang
Dielectric elastomer actuator (DEA) is considered as an ideal artificial muscle with soft and light in nature, widespread application in soft robotics and sensors. Dielectric elastomer (DE), the core component of DEA, with high output force and large actuation strain under relatively low driving electric field is critical for high-performance DEA. However, the widely used VHB series (3M) DE suffered from very large pre-strain and high driving voltage to get their high actuation performance, limiting their scope of application. In this work, the DEs with good mechanical and dielectric properties were prepared via UV curing method consisting of acrylic acid (AA) with strong polar groups as functional monomer, n -butyl acrylate (BA) as soft monomer and urethane acrylate as cross-linker (c-p(BA-AA)). The c-p(BA-AA) DE films obtained the simultaneous increasing of dielectric constant and breakdown strength with the increasing content of AA, which guaranteed the good actuation performance. The c-p(BA-AA) film exhibited excellent actuating performance (44.11% actuation strain at 45 kV/mm) without pre-strain. Besides, a simple linear actuator based on the c-p(BA-AA) film could easily output weight that is tens of times of its own active weight (654.1 mN/g at 30 kV/mm).
研究领域:
材料科学
·
软体机器人技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 17
·6249
·
IF 4.6
Yue Lu,Jingke Wei,Haojie Jin,Liming Tang
To overcome the shortcomings of the temperature sensitivity of exterior flexible facing tiles (EFFIs), a series of crosslinking carboxylic styrene-acrylate (SA) latices were prepared via the semicontinuous seed emulsion polymerization of glycidyl methacrylate (GMA), methacrylic acid (MAA), acrylic acid (AA), butyl acrylate (BA), and styrene (St), and were applied as binders to fabricate EFFTs with mineral powder. The obtained latices exhibited Bragg diffraction because of the narrow particle size distribution. Owing to the low dosage of emulsifiers and the crosslinking reaction between the epoxy group and the carboxyl group, the latex films displayed excellent water resistance, with water adsorption as low as 7.1%. The tensile test, differential scanning calorimeter (DSC) test, and dynamic mechanical analysis (DMA) indicated that at a GMA dosage of 4–6% the latex films had high mechanical strengths, which remained relatively stable in the temperature range of 10 to 40 °C. The optimal AA dosage was found in the range of 2 to 3%, at which the wet mixture exhibited good processability, conducive to forming an EFFT with a compact microstructure. Using the optimal SA latex, the obtained EFFT displayed a series of improved performances, including low water absorption, high mechanical strength, and stable self-supporting ability over a wide temperature range, exhibiting the application potential in the decoration and construction industries.
研究领域:
材料科学
·
聚合物化学
·
建筑材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Houchao Jing,Jinyang Feng,Jianping Shi,Lin He,Peipei Guo,Shuang Guan,Hai Fu,Yuhui Ao
Hydrogels that exhibit properties such as ultra-elongation, self-recovery, and self-healing have applications in sensors and many other fields. With these properties and applications in mind, we hypothesised that we could develop a strain-sensing hydrogel based on acrylic acid , stearyl methacrylate , cationic guar gum , and hexadecyl trimethyl ammonium bromide, without any covalent crosslinker. The hydrogels are instead held together by physical, non-covalent interactions such as ionic interactions, hydrogen bonding , and the hydrophobic effect , as suggested by spectroscopy and swelling experiments. The hydrogels exhibit many useful properties, such as: excellent stretching—up to 4267%—and almost complete reversion to their original state at a large strain of 500%, even after 20 successive cycles; temperature-dependent self-healing and self-recovery; and strain-sensitive conductivity that is attributable to the directional migration of ions. Because of these outstanding features, such as notch-insensitivity and the ability to withstand knotting under high strain, our hydrogels will be useful as flexible sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yafang Han,Ziyang Gong,Renjie Zhou,Weile Li,Jun Shi,Jiwen Hu
In modern industrial applications, achieving strong adhesion to low surface energy materials, such as polyethylene, polypropylene, and polytetrafluoroethylene, is a significant challenge. This is primarily due to their inherent chemical inertness and weak interfacial interactions. To address this challenge, this study developed a novel pressure-sensitive adhesive with an interpenetrating network (IPN) structure. This was achieved by synthesizing linear polyethylene glycol-based polyurethane acrylate (PUA) oligomers and combining them with polyacrylate pressure-sensitive adhesives (PSA) to form the IPN structure. By adjusting the content of PUA, the viscoelasticity, mechanical, thermal, and adhesive properties of the PSA-PUA system were successfully optimized. The results demonstrate that the PSA-PUA20 exhibits excellent adhesion performance on polyethylene(PE) substrates, with a peel strength of 364.75 N/m and a loop tack of 4.03 N. Compared to polyacrylate pressure-sensitive adhesives (PSA), these values represent increases of 240.25 % and 46.58 %, respectively. Additional lap shear tests further confirmed that the PSA-PUA20 enables cyclic adhesion on polytetrafluoroethylene (PTFE) substrates. A mechanistic analysis reveals that the incorporation of PUA alters the surface energy of the adhesive, improving its spreading properties on low surface energy materials. Additionally, it strengthens the hydrogen bonds and van der Waals forces between molecular chains, significantly improving the cyclic shear performance and adhesion performance on low surface energy substrates. Furthermore, the PSA-PUA adhesive exhibits excellent antioxidant and thermal stability, offering a promising solution for the design of high-performance PSAs.
研究领域:
材料科学
·
高分子化学
·
工业应用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 59
·期 10
·904-911
·
IF 0
Ye Tian,Cong Du,Bin Liu,Hao Nan Qiu,Xing-Hong Zhang,Zi Liang Wu,Qiang Zheng
Fluorescent hydrogels have promising applications in biomedical and engineering fields. However, they are usually mechanically weak. Here, we report a fluorescent composite hydrogel with high toughness, which is facilely prepared by solution casting ethanol solution of poly(hydroxyurethane) (PHU) and poly(stearyl acrylate- co -acrylic acid) (P[SA- co -AAc]) followed by swelling the casted film in water. The composite hydrogels with water content of 62–78 wt% possess remarkable mechanical performances, with tensile breaking stress of 0.3–1.1 MPa, breaking strain of 280%–400%, Young's modulus of 0.2–0.7 MPa, and tearing fracture energy of 1250–2630 J/m 2 . The high toughness is attributed to the effective energy dissipation of the network with hydrophobic association of SA units and hydrogen bonds between PHU and P(SA- co -AAc) as the physical crosslinks. The intense aggregation of carbamates and the formation of carbamate clusters through intra- and intermolecular hydrogen bonds endow the composite hydrogel with strong fluorescence. These hydrogels with high toughness and strong fluorescence should find applications in flexible electronics, information display, and biomedical devices. Graphical
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Chang Liu,An-Quan Xie,Guo-Xing Li,Qing Li,Cai-Feng Wang,Liangliang Zhu,Su Chen
The cracked morphology and iridescent properties of photonic crystal (PC) films have greatly limited their applications in the field of color pigments and optical instruments. Herein, we fabricated crack-free PC films with a controllable microscopic ordered structure by functionalizing carbon dots (CDs) onto poly(styrene-methyl methacylate-acrylic acid) (P(S-MMA-AA)) particles, enhancing the structural color contrast and saturation. Using the third-generation polyamidoamine (G3-PAMAM) dendrimer as a bridge, the CDs are coupled onto the P(S-MMA-AA) particles through the terminal amino groups of G3-PAMAM. The hydrogen bonds, derived from the grafted G3-PAMAM and CDs, effectively counteract the tensile stress of particle shrinkage during evaporation self-assembly, thereby enabling the formation of high-performance PC films. Moreover, due to the light absorption capacity and nanoscale effect of CDs, the CDs/P(S-MMA-AA) particles could be constructed to form robust PC films without the iridescence effect and effectively suppress the coffee-ring effect, which are developed to the colloidal PC ink for direct writing and patterning. Eventually, based on the Langmuir–Blodgett (LB) method, the CDs/P(S-MMA-AA) PC films with a controllable layer-structure are constructed, achieving the structural color regulation, which is expected to be applied to the design of smart windows.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2016
·
IF 2.478
Bin Chen,Shenwen Fang,Ting Chen,Yan Xiong,Ming Duan
Compound poly(methylmethacrylate (MMA)-acrylic acid (AA)-ethyl acrylate (EA))/Fe 3 O 4 superparamagnetic nanoparticles were synthesized successfully by emulsion polymerization and solvothermal reaction methods. The nanoparticles were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD) and thermogravimetry analysis (TGA). P(MMA-AA-EA)/Fe 3 O 4 nanoparticles exhibited superparamagnetic properties with a saturation magnetization value of 20 emu/g. The selective adsorption behaviors of nanoparticles toward dyes were investigated and the function of electronic interaction during the adsorption process was also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Shaojun Chen,Guocheng Ma,Xuejun Duan,Haitao Zhuo,Jianbin Xu,Heng Chen
In this work, hydrophobic association physical hydrogels were prepared by photoinitiated copolymerization of acrylic acid and butyl acrylate, followed by water immersion. The chemical structure, mechanical properties, self-healing behavior, and self-recovery properties of the physical hydrogels were studied in detail. The hydrogel possessed a large number of carboxyl groups owing to its high content of acrylic acid, and it was used to adsorb cationic dye. Different from brittle chemical hydrogels, the as-prepared physical hydrogels exhibited good tolerance to microwave heating. Thus, the dye-adsorbed hydrogel was successfully applied for microwave-assisted Fenton degradation of cationic dyes. Starting from the unique structure and properties of physical hydrogels, this work successfully explored application scenarios of these systems in dye adsorption and microwave-assisted degradation. The present findings will contribute to understand the relationships among structure, properties, and practical applications of physical hydrogels.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yuqi Yang,Longlong Zeng,Xiaoyan Li,Zaisheng Cai
Glasses such as automobile windshields, mirrors, and lampshades are prone to fogging due to temperature changes, which affects the process of use and even jeopardizes safety. Hydrophilic films can prevent the glass surface from fogging by absorbing condensation droplets. However, the anti-fog film only lasts for a short period because it will gradually dissolve with the moisture increasing, which leads to image distortion. Herein, we propose a hydrophilic/hydrophobic coating to achieve longer anti-fog persistence. The strong interface bonding of the polymer is the key to improving the durability performance of the coating. It prevents interfacial failure and folding caused by fogging conditions. In this paper, a multifunctional coating with good anti-fog and anti-frost properties was prepared using butyl acrylate (BA), acrylic acid (AA) and 4-benzoylphenyl acrylate (BPA) as the polymer monomers . The light transmission of coated glass is up to 90 % even under harsh fogging conditions. The poly(AA- co -BA-co-BPA) can be firmly bonded with the plasma-treated glass plate, which greatly enhances the durability and water resistance of the coating. After being immersed in deionized water for 60 h at room temperature, the coated glass still has a certain anti-fog effect and the light transmittance is maintained at about 85 %. In addition, the anti-fog coating has excellent self-healing properties due to the fact that the carboxyl group in AA can generate hydrogen bonding , so that it can be healed within 15 s with the help of hot water after physical damage. This anti-fog coating has great potential for application in construction, shipbuilding and other industries.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
SOFT MATERIALS
·
2024
·
IF 1.6
Mahdi Yadollahi Maghsoudlou,Guojun Cao,Zonghua Wang
This article describes the preparation of structural acrylic adhesives (SAA) with low odor and high strength. Isobornyl methacrylate and methacrylic acid were used as the main monomers. Cumene hydroperoxide was used as a radical polymerization initiator. The effects of tougheners, coupling agents, elastomers, monomers, and peroxide on the performance of acrylic adhesives were studied sequentially. The toughness of acrylic structural adhesives was discovered to be enhanced by the addition of carboxyl-terminated butadiene-acrylonitrile liquid rubber (CTBN) to the acrylic matrix. Coupling agents were added to improve SAA’s ability to adhere to steel. The results demonstrated that the SAA performs best when the methacrylic acid’s content is 7 wt%, cumene hydroperoxide’s content is about 1.5 wt%, CTBN’s content is 3 wt%, and the coupling agent’s content is 1 wt%. Adhesive modified using 2-hydroxyethylmethacrylate phosphate and CTBN as the toughener provided excellent adhesion to the steel substrate. Its lap shear strength was found to be above 24 MPa, its T-peel strength was up to 8.29 N/mm, and its impact strength was up to 12 kJ/m2. The resulting SAA is capable of meeting structural adhesive bonding strength criteria for steel-to-steel joints.
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 ENGINEERING JOURNAL
·
2022
·
IF 16.744
Kaiwen Zheng,Qiliang Gao,Chao Li,Guojie Zhang,Yingquan Wu,Qingde Zhang,Xiaoxing Wang,Junfeng Zhang,Yizhuo Han,Yisheng Tan
The development of environmentally friendly and efficient catalysts for the production of essential chemicals has always been a desirable goal for technology in the chemical industry. In this paper, we fabricated a kind of sodium (Na) super ionic conductor (NASICON)-type materials (H 1-x Ti 2 (PO 4 ) 3-x (SO 4 ) x ) with different Ti/P ratios through tuning titanium content in synthetic mother liquor, and applied them to the aldol condensation reaction of acetic acid (HAc) and formaldehyde (FA) to acrylic acid (AA) and methyl acrylate (MA), which has never been not reported in previous researches. More importantly, these novel catalysts have showed their tremendous potential at the efficiency of AA + MA production, and over an optimized catalyst of NSC-Ti/P-0.53, the AA + MA selectivity being 71% (HAc input-based) was achieved at 360 ℃ when the reactant with FA/HAc molar ratio of 5:1 was fed; whereas, a highest space–time-yield (STY) of target products (∼37.2 μmol·g −1 ·min −1 ) was obtained with the FA/HAc molar ratio of 1:2.5, which is comparable to the best result reported previously. The detailed analysis of characterizations demonstrated that the change in the Ti/P ratio in the series NASICON catalysts led to the variation in the phase composition, the textural properties, surface titanium oxidation state, etc. thereby tuning the surface acid-base property, which is quite important for the present condensation reaction. More amounts of acidic sites and basic sites as well as their moderate distribution were proved to exert the promotional effects on the formation of AA and MA.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）