JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 4
·1-8
·
IF 2.8
Li Dongxiang,Qian Xing,Huang Rui,Li Chunfang
Thermo-responsive poly( N -isopropylacrylamide) with terminal azobenzene group (PNIPAM-Azo) can show distinct property changes in response to temperature and light. In this paper, azobenzene-terminated trithiocarbonate (DDMAT-Azo) was synthesized as chain transfer agent, with which PNIPAM-Azo was prepared by reversible addition-fragmentation transfer (RAFT) polymerization of NIPAM in 1, 4-dioxane at 80 °C under N 2 atmosphere, azodiisobutyronitrile as initiator. The structure of DDMAT-Azo was characterized by nuclear magnetic resonance (NMR) and fourier transform infrared spectra, and PNIPAM-Azo was characterized by NMR spectra and Gel Permeation Chromatography (GPC). The result from GPC showed the numerical average molecular weight of PNIPAM-Azo was 3870 and its molecular weight distribution index was 1.31. Furthermore, thermo- and light-responsive hydrogel was obtained by introducing PNIPAM-Azo. Both PNIPAM-Azo and the hydrogel showed good light sensitivity and thermo sensitivity. Such double-stimuli sensitive hydrogel will be applied in biomaterials such as sensor, drug controlled release, information storage etc.
研究领域:
高分子化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2014
·
IF 3.766
Bingyan Jiang,Lei Zhang,Bing Liao,Hao Pang
A facile and effective strategy for fabricating a tunable wettability surface on cotton fabrics by dip-coating into self-assembled fluoro-copolymer micelle of poly(hexafluorobutyl methacrylate)- b -poly(oligo(ethylene glycol) methyl ether methacrylate) is developed. The micelle solution, exhibiting thermal-responsive property with uniform spheres at 20 °C and irregular particles at above 50 °C, shows switchable wetting behaviors at different dipping and drying temperatures due to the changeable chemical structure of responsive polymer on fibers. The cotton fabric processed in cold micelle is smooth caused by the self-assembled structure of thermal-responsive micelle with fluorinated parts on the outmost fiber-layer, and it also has high fluorine content and good hydrophobic property. While the one treated in hot micelle is rough, and has good hydrophilic property due to the outmost layer of hydrophilic PEG segments on fibers. This work provides a simple strategy to construct controllable wettability surface and makes a great application potential in household commodity, industrial products and other smart complex materials.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 19
·5771
·
IF 4.412
Jianfeng Zhan,Feng He,Shuxian Chen,Abishek Jung Poudel,Ying Yang,Lin Xiao,Fu Xiang,Shiming Li
Essential oils (EOs) have been used in cosmetics and food due to their antimicrobial and antiviral effects. However, the applications of EOs are compromised because of their poor aqueous solubility and high volatility. Qiai (Artemisia argyiLevl. et Van. var.argyicv. Qiai) is a traditional Chinese herb and possesses strong antibacterial activity. Herein, we report an innovative formulation of EO as nanohydrogels, which were prepared through co-assembly of Qiai EO (QEO) and Pluronic F108 (PEG-b-PPG-b-PEG, or PF108) in aqueous solution. QEO was efficiently loaded in the PF108 micelles and formed nanohydrogels by heating the QEO/PF108 mixture solution to 37 °C, by the innate thermo-responsive property of PF108. The encapsulation efficiency and loading capacity of QEO reached 80.2% and 6.8%, respectively. QEO nanohydrogels were more stable than the free QEO with respect to volatilization. Sustained QEO release was achieved at body temperature using the QEO nanohydrogels, with the cumulative release rate reaching 95% in 35 h. In vitro antibacterial test indicated that the QEO nanohydrogels showed stronger antimicrobial activity againstS. aureusandE. colithan the free QEO due to the enhanced stability and sustained-release characteristics. It has been attested that thermo-responsive QEO nanohydrogels have good potential as antibacterial cosmetics.Keywords:essential oil;qiai;nanohydrogel;thermo-responsive property;antibacterial activity
研究领域:
药学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Xingsheng Liu,Shengyuan Zhao,Wan Xu,Huijuan Zhang,Siyuan Lu,Zhenbin Chen,Fangfang Niu,Gang Wu
With decreasing global rhenium resources, it has become important to separate and purify rhenium in secondary resources, so a preparation strategy for a chitosan-comodified surface-grafted thermosensitive ion-imprinted composite membrane (CS-Re-TIICM) was developed in this work. The key of this design was that the two ends of a poly(N,N-diethylacrylamide) (PDEA) chain were grafted onto the imprinted polymer separating the layer matrix and the surface of the membrane, respectively, which aimed to improve the selectivity and desorption ratio of this material simultaneously. The structure and morphology of this material were characterized by FTIR and SEM, respectively. In addition, CS-Re-TIICM was applied to the secondary leaching solution of the high-temperature alloy to test the actual separation effect, and results showed that CS-Re-TIICM, possessing thermoresponsive recognition sites, and the structure of the imprinting cavity could be adjusted by temperature, which helped this material achieve good selective separation and purification performance for ReO4–. The maximum adsorption capacity was 0.1071 mmol/g at 35 °C. CS-Re-TIICM not only showed an excellent selectivity (separation ReO4–/MnO4– of 3.90 in the presence of interfering ion MnO4–) but also presented an excellent desorption performance (desorption ratio of 68.94%) and good reusability (adsorption capacity of 0.0425 mmol/g, desorption ratio of 59.13%, and separation degree of 1.24). When CS-Re-TIICM was applied to the secondary leaching solution of high-temperature alloys, the purity of Re was increased from 35.41% to 65.10% after one adsorption/desorption cycle, which depicted a prospective application in the industrialized separation of ReO4– from a complex environment.
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
ChemistrySelect
·
2025
·Vol. 10
·期 37
·e02789
·
IF 2
Li Zhong,Yuxin Duan,Meiying Wang,Xiao Xu,Minghuan Qian,Xu Jia
The polymers of N , N -diethylacrylamide (DEA) exhibit temperature-dependent sensitivity attributable to the presence of both hydrophilic and hydrophobic groups. However, their lower critical solution temperature (LCST) is only 25 °C, a limitation that restricts their practical applications. Previous studies have shown that the incorporation of cationic monomers for copolymerization can enhance the LCST of polymers. In this study, dimethyldiallylammonium chloride (DMDAAC) and DEA were selected for copolymerization to obtain a series of thermosensitive water-soluble polymers, poly(DMDAAC- co -DEA). Structure and properties were characterized using FT-IR, 1 H NMR, TG-DSC, and surface tension test. Combined with the critical phase transition mechanism, it was determined that the hydrophilicity of the polymer underwent a gradual increase in proportion with the increase of DMDAAC blocks in polymers, and the LCST exhibited an increase of up to 36.8 °C. The relationship between polymer structure and demulsification performance was also explored, as represented by the application of O/W emulsion. The experimental findings demonstrated that all poly(DMDAAC- co -DEA) products exhibited effective demulsification performance. The demulsification rate of the polymers with 30%, 50%, and 70% of DMDAAC could reach 97.03%, 98.20%, and 98.40% respectively, which shows great potential for the petroleum demulsification application. Graphical Water-soluble polymer Poly(DMDAAC- co -DEA) are synthesized using a three-step heating method. A comprehensive investigation is conducted into the relationship between its LCST and copolymerization ratio, resulting in the elucidation of the underlying mechanism. Furthermore, the demulsifying properties of the copolymer are investigated.
研究领域:
高分子化学
·
石油化学
·
胶体与界面科学
·
功能材料
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12921-12939
·
IF 3.553
He Yayue,Sun Shaofeng,Han Na,Zhang Xingxiang,Li Wei
Abstract Intelligent breathable membranes with multiple functions attach wide attentions of people which provide protection and comfort to meet the pressing demand for future protective clothing. We proposed a novel thermal energy regulated and thermochromic composite film with temperature-sensitive “breathable” stomata consisted of thermochromic nanofibrous membrane (TC-NFM) and thermo-sensitive polyurethane (PU) film. Thermochromic nanoencapsulated phase change materials (TC-NPCMs) were introduced as functional fillers into polyvinyl alcohol/water-soluble polyurethane (PVA/WPU) solution for electrospinning process. And methylated melamine–formaldehyde (MMF) was innovatively used to modify the water resistance of TC-NFM. By adjusting the molecular weight of the soft segment, the thermo-sensitive PU film was successfully prepared. Consequently, the prepared TC-NFM exhibited high enthalpy of 44.3 J g −1 and kept superior energy storage and release property even after 100th cyclic experiments. The water vapor permeability of thermo-sensitive PU film was triggered near the comfortable temperature of the human body. The results presented here might facilitate improvements in the field of thermal regulation clothing, intelligent clothing, wearable temperature sensor and reversible thermochromic coating materials. Graphic abstract
研究领域:
材料科学
·
智能纺织品
·
功能涂层
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Zhiping Du,Xiaofeng Sun,Xiumei Tai,Guoyong Wang,Xiaoying Liu
Thermosensitive poly(ethylene glycol) methyl ether methacrylate (POEGMA) was grafted on SiO 2 nanoparticles using activators generated by electron transfer atom transfer radical polymerization (AGET-ATRP) technique. The effects of the amount of ligand, catalyst, ascorbic acid and monomer, as well as the reaction temperature and time were systematically investigated and optimized to get a high grafting density. The structure of the hybrid materials was characterized by Fourier transform infrared (FTIR) spectroscopy, and the morphology was characterized by transmission electron microscopy (TEM) observations. Thermosensitive properties of SiO 2 -POEGMA particles were investigated at different grafting densities by turbidity measurements.
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Wan Xu,Bingqian Wang,Yuan Sun,Xiaojian Ou,Yuanjun Sun,Peng Zhang,Zhenbin Chen
Ruthenium, one of the platinum group elements, plays a crucial role in industrial development, and it is important to develop a material to separate and purify ruthenium with high efficiency to ensure its supply. Herein, a thermoresponsive Ru(III)-imprinted polymer (Ru(III)-TIIP) was prepared by combining thermoresponsive technology, Pickering emulsion technology, and imprinted technology. The Ru(III)-TIIP could regulate its structure by controlling the external temperature and maintained good adsorption and separation performance. The structure and performances of Ru(III)-TIIP were tested and evaluated by Fourier transform infrared, scanning electron microscopy, energy-dispersive spectrometry, transmission electron microscopy, specific surface area, porosity analysis, zeta potential, X-ray photoelectron spectroscopy, thermogravimetric analysis, and inductively coupled plasma-atomic emission spectrometry. The results showed that the maximum adsorption capacity (Q) of Ru(III)-TIIP was 0.2203 mmol/g under 33 °C. The maximum desorption rate (D %) was 78.1%, which was reached at 25 °C. When Fe(III) was used as the interfering ion, the separation degree (R) of Ru(III)-TIIP was 3.2. Meanwhile, the study of the adsorption process of Ru(III)-TIIP to Ru(III) was more suitable to be expressed by pseudo-first-order kinetics and the Langmuir model. When Ru(III)-TIIP was applied to the platinum group catalyst leach solution, the content of platinum group elements ranged from 53.72 to 82.09% after one adsorption/desorption cycle. In addition, Ru(III)-TIIP had maintained 66.14 and 81.25% of the original capacity for Q and R after 11 adsorption/desorption cycles.
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
RSC Advances
·
2016
·Vol. 6
·期 67
·62186-62192
·
IF 3.289
Jianjian Cai,Shouyong Zhou,Yijiang Zhao,Ailian Xue,Yan Zhang,Meisheng Li,Weihong Xing
The hydrophilicity of a thermo-responsive PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane was enhanced via surface segregation induced by coagulation bath temperature (CBT). The N1s content of the hybrid ultrafiltration membranes prepared at 5 and 20 °C is 1.77% and 1.02%, respectively while that of the membrane prepared at 40 °C is just 0.73%. This indicated that the PNIPAAM chains could be dragged to the membrane surfaces or pores via surface segregation induced by temperature. This resulted in higher hydrophilicity and permeability as well as thermo-responsiveness for membranes prepared at lower temperatures. The initial water contact angle of the PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane prepared at 5 and 20 °C is 75.2° and 75°, respectively, which is about 6° lower than the one prepared at 40 °C. A higher pure water flux (PWF) of about 366 L m−2 h−1 at 40 °C was obtained for the hybrid membrane prepared at 5 °C while the one prepared at 40 °C only reached 274 L m−2 h−1. Meanwhile, membranes prepared at low temperature exhibited fewer macrovoids, lower membrane thickness and larger elongation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yue Gao,Shanshan Pan,Genyuan Guo,Qingqing Gu,Ronghui Pan,Yajing Guan,Jin Hu
Sweet-waxy corn is susceptible to chilling injury, and vulnerable to be counterfeited. This study developed a kind of newly thermoresponsive coating material with dual efficacies of intelligent chilling-resistant and anti-counterfeiting for maize seed. The coating material was named as PRBSA, which was made of salicylic acid (SA) and rhodamine B (RB) co-loaded poly (N-isopropylacrylamide-co-butylmethacrylate) hydrogel. The surface morphology of PRBSA was compact than its interior, where it was uneven and irregularly distributed pore structure . Below the lower critical solution temperature (LCST), PRBSA was water-soluble and hydrophilic, loaded SA and RB could release sharply from PRBSA, whereas above this LCST, PRBSA formed an insoluble and hydrophobic aggregate, the release rate of SA and RB was obviously decreased. Meanwhile, PRBSA showed a better thermal stability than unloaded hydrogel. In addition, seeds were coated with PRBSA, and its seedling quality and fluorescence labeling under chilling stress were determined. These results showed that compared with the CK (basic coating agent), PRBSA treatment significantly enhanced seed germination percentage by 17.8% and vigor index by 53.1% under chilling stress. The seedling shoot height and dry weight were also significantly improved, which might closely related with the lowest malondialdehyde and relative electrical conductivity level, and the highest maximal quantum yield of PSII (Fv/Fm). Moreover, the surface of PRBSA coated seeds showed bright red fluorescence under the excitation green light of 546 nm. When responding to low temperatures, its fluorescence intensity exhibited a sharp decline, showing a temperature-sensitive release of RB. Therefore, PRBSA was considered as a novel seed coating with intelligent chilling-resistant and anti-counterfeiting function.
研究领域:
植物学
·
农业科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·151
·
IF 3.426
Juan Tan,Shuibo Xie,Guohua Wang,Chuck Wah Yu,Taotao Zeng,Pingli Cai,Huayong Huang
In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.Keywords:orthogonal experiments;U(VI);thermo-sensitive hydrogel;adsorption;wastewater treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 13
·5925-5932
·
IF 3.591
Cheng Zhou,Yan Chen,Mingjun Huang,Yi Ling,Liming Yang,Guochen Zhao,Jie Chen
A dual temperature-responsive triblock polymer (poly(N-isopropyl acrylamide)-block-poly(N,N-dimethyl acrylamide)-block-poly(acrylamide-co-acrylonitrile)) (P(AM-co-AN)-b-PDMA-b-PNIPAM) (NDAA) was obtained by sequential reversible addition–fragmentation chain transfer (RAFT) polymerization,with the uncharged UCST temperature-sensitive block P(AM-co-AN) and the classic LCST-type temperature-sensitive block PNIPAM. This well-defined thermo-responsive copolymer with tunable compositions exhibits a dual thermal response behavior in water. Properly designing the length of the block can make the block copolymer undergo a phase transition within the envisaged temperature range. When the concentration is 5 wt%, the UCST of the NDAA polymer is around 20 °C, and the LCST is around 31 °C. All three blocks of these polymers are soluble in water within 20–31 °C. At high temperature, PNIPAM hydrophobically aggregates into a core, and NDAA self-assembles into a core1 (PNIPAM)–shell (PDMA)–corona1 (P(AM-co-AN)) structure. In contrast, at low temperatures, P(AM-co-AN) forms hydrogen bonds and is insoluble in water, and NDAA self-assembles into a core2–shell–corona2 structure. In this way, it is possible to prepare spontaneously reversible micellar aggregates in water. After the concentration reaches the lowest critical concentration, the NDAA polymer can undergo a reversible gel behavior, that is, a phase transition occurs near the UCST and LCST. This change in the polarity of the micelle core opens up the possibility of dissolving different compounds in water just by changing the temperature.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）