JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 6
·
IF 1.395
Alsamani A. M. Salih,Chunhai Yi,Jiayang Hu,Lijuan Yin,Bolun Yang
A vinyl amine–vinyl alcohol copolymer (VAm–VOH) was synthesized through free-radical polymerization, basic hydrolysis in methanol, acidic hydrolysis in water, and an anion-exchange process. In the copolymer, the primary amino groups on the VAm segment acted as the carrier for CO 2 -facilitated transport, and the vinyl alcohol segment was used to reduce the crystallinity and increase the gas permeance. VAm–VOH/polysulfone (PS) composite membranes for CO 2 separation were prepared with the VAm–VOH copolymer as a selective layer and PS ultrafiltration membrane as a support. The membrane gas permselectivity was investigated with CO 2 , N 2 , and CH 4 pure gases and their binary mixtures. The results show that the CO 2 transport obeyed the facilitated transport mechanism, whereas N 2 and CH 4 followed the solution–diffusion mechanism. The increase in the VAm fraction in the copolymer resulted in a carrier content increase, a crystallinity increase, and intermolecular hydrogen-bond formation. Because of these factors, the CO 2 permeance and CO 2 /N 2 selectivity had maxima with the VAm fraction. At an optimum applied pressure of 0.14 MPa and at an optimum VAm fraction of 54.8%, the highest CO 2 permeance of 189.4 GPU [1 GPU = 1 × 10 −6 cm 3 (STP) cm −2 s −1 cmHg −1 ] and a CO 2 /N 2 selectivity of 58.9 were obtained for the CO 2 /N 2 mixture. The heat treatment was used to improve the CO 2 /N 2 selectivity. At an applied pressure of 0.8–0.92 MPa, the membrane heat-treated under 100°C possessed a CO 2 permeance of 82 GPU and a CO 2 /N 2 selectivity of 60.4, whereas the non-heat-treated membrane exhibited a CO 2 permeance of 111 GPU and a CO 2 /N 2 selectivity of 45. After heat treatment, the CO 2 /N 2 selectivity increased obviously, whereas the CO 2 permeance decreased. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131 , 40043.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 22
·
IF 1.64
Yanyan Zhang,Hong Fan,Bo-Geng Li
Advance polyamide-6- b -polydimethylsiloxane (PA6- b -PDMS) multiblock copolymers were first synthesized via the polymerization in bulk. Binary carboxyl terminated PA6 was served as the hard segment and PDMS modified with hexamethylene diisocyanate (PDMS-NCO) was the soft segment. A series of PA6 -b- PDMS copolymers based on different content and length of soft segments were obtained. Interestingly, Differential scanning calorimetry (DSC) studies revealed no obvious change in melting temperature after introducing PDMS segments to copolymers. The high melting temperatures indicated these copolymers possess potential applications in automotive industry that require high continuous use temperatures. DSC and transmission electron microscopy studies both demonstrated increasing the length and the content of the soft segment contributed to increasing of the degree of microphase separation. However, the improvement of thermal stability resulting from PDMS segments was also observed by thermo gravimetric analysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41114.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 7
·49831
·
IF 2.52
Tao Li,Weilin Wang,Songmeng Wang,Lingyan Liu,Weixing Chang,Jing Li
An amphiphilic block copolymer PNIPAM 53 - b -(PS 30 - co -P4AMS 10 ) was facilely prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. The immobilization of ( S )-α,α-diphenylprolinol trimethylsilyl ether onto the block copolymers was then performed through using copper-catalyzed alkyne-azide cycloaddition (CuAAC), and the generating amphiphilic diblock copolymer supported chiral catalyst PNIPAM 53 - b -(PS 30 - co -P4AMS 10 )/proTMS was self-assembled into micelles with regular diameters about 50 nm in aqueous solution. The micellar catalyst was further used for the asymmetric Michael reaction between propanal and trans -β-nitrostyrene in water. Using only 1 mol% micellar catalyst, the corresponding Michael addition products could be obtained in good yields and high enantioselectivities as well as good diastereoselectivities. In addition, this micellar catalyst could be reused at least for four times. Moreover, the micellar catalyst could be applied for the asymmetric addition reaction of 4-chlorocinnamyl aldehyde and nitromethane, and thus constructing the baclofen pharmaceutical intermediate.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·
IF 1.289
Di Zhao,JianFeng Xu,Lu Wang,JianJia Du,KeDong Dong,CaiFei Wang,XiangDong Liu
Two phosphorylated chitosan derivatives with a similar degree of substitution of about 0.5 were synthesized via either the esterification of chitosan's hydroxyl groups by P 2 O 5 in methanesulfonic acid or the selective incorporation of methylene phosphonic groups on chitosan's amino groups by formaldehyde/H 3 PO 3 in water. The performances of the resulting O -phosphorylated chitosan (OPC) and N -methylene phosphonic chitosan (NMPC) as amphoteric flocculants were assessed in comparison with that of unmodified chitosan. In turbidity removal experiments using kaolin suspensions in water, OPC removed about 90% turbidity, but NMPC only removed 60%. The lower flocculation efficiency of NMPC was attributed to the decreased acid strength of the N -methylene phosphate groups in NMPC. These results revealed that the acidity of the phosphate groups introduced in the modified chitosans is an important factor with regard to the flocculation efficiency, and consequently that O-phosphorylation is more suitable than N-phosphorylation for preparing chitosan-based amphoteric flocculants. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 22
·
IF 1.64
Lanlan Liu,Jinbao Guo,Jie Wei
A fluorescence imaging system is designed based on the photodecomposition of photobase generators embedded in polyvinyl butyral (PVB) matrix. These photobase generators were synthesized with propyl and phenethyl units served as leaving groups, and phthalimido, succinimido, di-2-thienyl ketoximino, and benzophenoneoximino units acted as photosensitive species, respectively. The influences of the two leaving groups and four photosensitive species on the photochemical behavior were investigated in detail. The results demonstrate that the photochemical properties of these photobase generators depend on the photosensitive species other than the leaving groups. And further study shows that succinimido propylcarbamate (SPrC) exhibits the best thermal stability and relatively quick rate of photodecomposition among all the photobase generators. Therefore, a PVB film embedded with SPrC is used as a fluorescence imaging material. The patterned fluorescence image obtained from the fluorescamine-treated irradiated PVB film showed bright green fluorescence, which provides potential application for optical storage or color electronic displays. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41058.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 10
·e56550
·
IF 2.7
Yuhang Huang,Yingkang Zhu,Lijun Cao,Yidan Jing,Zhigang Xu,Guochu Tang,You Shu,Xiaoqing Liu,Xiaomin Zhang
The photo-induced cis-trans isomerization of azobenzene molecules, known for their significant color changes, is extensively utilized in the functional modification of polymeric materials. However, the research on the functionalization of biomass-based polyesters with azobenzene is limited. A key raw material for biomass-based coatings possess reactive double bonds and excellent film-forming capabilities, offering significant advantages for azobenzene functionalization in biomass-based polyester applications. In this study, AESO served as the polyester matrix and acrylate azobenzene derivatives as the functional molecules. Under ultraviolet radiation, AESO underwent a carbon–carbon crosslinking reaction with the azobenzene derivatives to synthesize a novel resin. The coating of this resin on a PET substrate exhibited excellent pencil hardness (3B), adhesion (5B), and solvent resistance. By alternating exposure to ultraviolet and blue light, the coating displayed reversible switching between cis and trans isomers, enabling reversible writing and erasing of patterns. Even after 20 cycles of writing and erasing, high-resolution patterns could still be observed (clearly visible under a 12x microscope). Furthermore, the image could be retained for up to 2 h under sunlight irradiation. This study presents a new method for functionalizing biobased polyesters.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 10
·e56569
·
IF 2.7
Jianmin He,Hao Liu,Bingtao Bao,Hanzhong Ren,Weixiang Xu,Qiuyan Luo,Yiting Xu,Jie Li,Birong Zeng,Conghui Yuan,Guorong Chen,Lizong Dai
The marine environment with high humidity and salinity poses higher requests on the service life of traditional polymer coatings therefore, various fillers have been developed for modification. Smart coatings built by fillers that possesses passive barrier and active self-healing properties show considerable prospects in metal protection. Herein, we applied a novel dual-loading strategy to design tannic acid (TA) decorating hydroxyapatite (HAp)/zeolite imidazole framework (ZIF-8) loading 2-amino benzothiazole (2-ABT) composite fillers. The epoxy coating (EP) doped with ABT@ZIF8-HAp@TA (AZHT/EP) presented hydrophobicity and improved mechanical performance on Q215 steel. Moreover, the |Z| f=0.01Hz of AZHT/EP after immersion in saline water for 28 days (6.24 × 10 10 Ω•cm 2 ) is higher than pure EPs with two magnitudes. The anticorrosion mechanism of the AZHT/EP was proposed based on the analysis of corrosion products. To conclude, the dual-loading strategy has considerable potential in designing smart coatings for corrosion protection in harsh environments.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52720
·
IF 3.057
Xiaolong Wang,Weiguang Gong,Xin Meng,Chenyang Li,Jin Gao
Biobased flame retardant (FR) has attracted great interest owing to its green and degradable properties similar to polylactic acid (PLA). In this work, with ammonium polyphosphate (APP) as the core, chitosan (CS) and halloysite (HNT) as the shell, a biobased FR (APP@CS@HNT) with a core-shell structure was prepared through the self-assembly method. The flame retardancy of PLA composites has been improved with the addition of the FR (APP@CS@HNT). With the loading of 17 wt% APP@CS@HNT, the PLA composite shows a high limiting oxygen index value (29.4%) and achieves vertical burning (UL-94) test V0 rating. Compared with pure PLA, the cone calorimetry test indicates that the peak heat release rate (PHRR) and total heat release decrease from 299.88 to 152.29 kW/m 2 and from 102.0 to 71.2 MJ/m 2 , respectively. The addition of APP@CS@HNT can also improve the smoke suppression performance of PLA composites. Such enhanced flame retardancy is mainly attributed to APP@CS@HNT prompting the PLA matrix to produce more continuous and denser carbon layers at a lower temperature to form physical barriers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 1
·46897
·
IF 1.901
Huayong Luo,Hongwei Rong,Tian C. Zhang,Xueyang Zeng,Jun Wan
Amino-functionalized magnetic zirconium alginate beads with an interpenetrating network (Fe 3 O 4 /PAM/SA–Zr) were prepared, characterized, and then tested as a novel biomass adsorbent for phosphate removal and recovery. The hydrogel beads exhibited outstanding thermostability and possessed a magnetic response. The effects of the pH, dosage, initial phosphate concentration, interference ions, and temperature on the removal of phosphate were investigated. The kinetics, isotherms, and thermodynamics of the adsorption were studied. Notably, the adsorption of phosphate was endothermic, feasible, and spontaneous with a maximum uptake capacity of 42.23 mg-P/g at an optimized pH of 2.0. The phosphate could be desorbed effectively with a 0.2 mol/L NaOH solution, and the adsorbent exhibited a good reusability. The possible adsorption mechanisms were verified by zeta potential, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses. Continuous phosphate-adsorption tests were conducted in a fixed-bed columns packed with Fe 3 O 4 /PAM/SA–Zr, and the breakthrough curves were predicted by the Adams–Bohart, Thomas, and Yoon–Nelson models, respectively. The suitability of the hydrogel beads for the treatment of real wastewater was also tested. These hydrogel beads should be a promising adsorbent for phosphate removal and recovery from aqueous solutions, with the advantages of a high uptake capacity, good reusability, and easy magnetic separation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46897.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 34
·47896
·
IF 2.188
Changjie Yin,Qiuyu Zhang,Zhuorui Zhang,Chengyuan Zhu,Jianxun Liu
The emulsion free-radical copolymerization of vinyl triethoxysilane (VTES) with styrene (St) and butadiene (Bd) was initiated by cumene hydroperoxide and ferrous sulfate at 0 °C. The effects of VTES on the copolymerization conversion, reaction time, gel content, latex particle size, thermal stability, and mechanical properties were thoroughly investigated. The success of this reaction was confirmed by the peaks attributed to both Si─O─Si groups at 1065 cm −1 and the Si─O─C bond at 1046 cm −1 . A kinetics analysis showed that the conversion decreased with increasing VTES mass in the monomer feed. Compared with that in the St–Bd copolymer, the latex particle size increased slightly with increasing VTES mass. The Mooney viscosity and gel content results show that a large fraction of precrosslinking molecular chains was formed in the rubber particles. The thermogravimetric analysis results indicate that the thermal stability of the copolymers increased with increasing VTES concentration. The 300% modulus and tensile strength of the St–Bd–VTES copolymer increased with the mass of VTES at first and then decreased after 3 phr VTES, whereas the elongation at break decreased with increasing VTES mass. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47896.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 129
·期 2
·748-755
·
IF 1.289
Xipan Liu,Dan Pan,Qian Guo,Yanjun Zhao,Zheng Wang
This study designed a photo-crosslinkable poly(ether-anhydride) nanocarrier with folate modification to achieve both biodegradability and active targeting. The nanocarrier consists of a hydrophobic polymer core and a shell of folate and hydrophilic poly(ethylene glycol). Nuclear magnetic resonance and Fourier transform infrared spectroscopy were used to verify the synthesis and relevant intermediate products. The nanocarrier was characterized in terms of morphology and diameter using transmission electron microscopy and dynamic light scattering. The results showed that the size of spherical nanocarriers located within 200–400 nm. The cellular uptake profile of nanocarriers in HeLa cells was examined using fluorescence microscope with the help of a fluorescent molecule and the folate-modified nanocarrier exhibited an enhanced uptake compared to that without modification. The nanocarrier degradation at physiological temperature was investigated gravimetrically and the in vitro release of model drug, paclitaxel (PTX) was examined via the dialysis method. The erosion rate of poly(ether-anhydride) network was controlled by the crosslinking density and the hydrolytic susceptibility; the folate modification slightly slowed the degradation process. The time scale of PTX release perfectly matched with that of nanocarrier erosion; after 6 h more than 50% weight loss of nanocarrier was observed and meanwhile the drug release profile got plateaued, indicating the dominant role of polymer erosion in the release of the active agent from the nanocarriers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yuanzhen Chu,Yang Lyu,Xingjun Wang,Xueqiong Ouyang,Yi Shen,Shuangxi Wang
A large number of toxic, flammable, and volatile organic solvents are used in the organic tape-casting process, which have significant adverse effects on both the natural environment and human health. This study reports an aqueous polymer–ceramic slurry suitable for tape casting using water as the solvent instead of traditional organic solvents. The effects of chemical additives (dispersant, binder, plasticizer, and defoamer) on the viscosity, stability, and bubble content of the water-based alumina ceramic slurry used for aqueous tape casting were investigated. The results showed that when the dispersant (ammonium polyacrylate) (PAA-NH 4 ) and defoaming agent (M15-01) contents were 1.5 and 0.1 wt%, respectively, and the ratio of binder (polyvinyl alcohol) (PVA) to plasticizer (glycerol) was 0.6, the surface of the green tape obtained by aqueous tape casting was the smoothest and flattest. Moreover, the alumina ceramic substrate of a size of 100 mm × 100 mm obtained by cutting and sintering the green tape exhibited dielectric constant, thermal conductivity, and breaking tenacity of 9.73, 23.16 W m −1 K −1 , and 4.34 MPa m 1/2 , respectively, making it an ideal candidate for high-power integrated circuits. This study not only addresses the environmental and health concerns associated with organic solvents but also presents a promising solution for developing advanced aqueous polymer–ceramic slurries.
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