JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 20
·e53857
·
IF 3
Hong Song,Chaofan Liu,Daxiang Gui,Ye Sha,Qingping Song,Puyou Jia,Jiangang Gao,Ying Lin
The development of sustainable and functional epoxy resins from renewable biomass is gaining increasing attention. Herein, renewable and mechanically strong epoxy resins from chitosan and tung oil that possess proton conduction properties are developed. Firstly, tung oil-based epoxy monomers and chitosan based chain transfer agent were prepared. Then, a “grafting from” reversible addition-fragmentation chain transfer (RAFT) polymerization was carried out on chitosan using epoxy monomers toward elastic graft copolymer, which combined rigid backbone and flexible side chains in one macromolecule. After being cured with citric acid (catalyst-free), a biomass-based epoxy resins with dual network structure can be obtained. The thermal and mechanical properties of these epoxy resins could be tuned through controlling the content of cross-linkers. Moreover, the chitosan bearing abundant amino groups not only enhanced strength of the epoxy resins, but also endowed them with proton conductivity. Overall, the epoxy resins exhibited high tensile strength and comparable proton conduction, which provides a new paradigm to design green functional materials for potential applications.
研究领域:
材料科学
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可持续化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 39
·e52936
·
IF 3.057
Yingyi Ma,Zian He,Ziwei Liao,Yuhang Han,Junming Zhang,Min Zhu
The dimensional and property stability after heating is considered to be one of the most important properties for low-dielectric-constant materials. Herein, porous structure contained composite PI film with porous PI structure on the surface of a flat PI film was prepared through the simple and low-cost microemulsion method. The introduction of porous coating can significantly improve the dielectric and water resistance properties of PI film, while maintaining its good mechanical properties. More importantly, the porous structures were well preserved after heating, but with the remove of surfactant layer on the inner surface of the pores, leading to lower dielectric constants with 1.06%–3.50% of reduction and lower dielectric losses less than 0.015 with the maintenance of good water resistance and mechanical properties. Excellent durability of the low dielectric constants and low dielectric losses upon high humidity were also shown for the heated composite PI film. In addition, the morphology and properties of the composite PI film both before and after heating could be controlled through varying the fabrication conditions. These results provide valuable information for the construction of the thermally stable low-dielectric-constant material.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 19
·
IF 1.86
Xiaohai Bu,Zewu Zhang,Zusheng Hang,Ying Huang,Yuming Zhou
Novel optically active and racemic poly( N -propargylamides) bearing tyrosine pendants (LPT, DPT, and RPT) were synthesized and characterized. The polymers possessed moderate molecular weights and were thoroughly soluble in common organic solvents. The secondary structure of these three polymers in chloroform was studied and the results indicated that LPT and DPT could adopt helical structures with predominantly one-handed screw sense according to their intense Cotton effect and large specific rotation values, while RPT adopted random coiled polymer chain. The amide groups could form amide-amide hydrogen bonds to engender the twist of dihedral angle and the strong steric repulsion of phenol groups might have the opposite effect on the helix. The helical structure of the optically active polymers were conclusively constructed and stabilized by the optimization of intra- and intermolecular hydrogen bonding and steric repulsion of the side chains. Moreover, the infrared emissivity values of LPT and DPT at 30 °C were 0.682 and 0.671, which were much lower than RPT. LPT and DPT also showed superior heat resistance due to their unique helical conformation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44824.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 19
·
IF 1.64
Jiangdong Dai,Zhiping Zhou,Yongli Zou,Xiao Wei,Xiaohui Dai,Chunxiang Li,Yongsheng Yan
A surface imprinted core-shell nanorod with water-compatible property was first prepared, using a two-step “living” polymerization technique, with magnetic attapulgite (MATP) as core, and it was applicable in the enhanced selective removal of sulfamethazine residue from pure water environments. MATP was synthesized by an impregnation and pyrolysis method, and polymerable group was subsequently attached onto the surface. The imprinted polymer nanoshell (13 nm) with the “living” fragments was formed via a reverse atom transfer radical precipitation polymerization, avoiding the tedious graft of initiator and providing the easy-accessible imprinted sites. Ultrathin hydrophilic polymer brushes (2.0 nm) were surface-grafted to improve their water-compatibility. The nanoadsorbent exhibited good thermal stability, magnetism, and hydrophilicity through characterization. The nanoadsorbent showed large adsorption capacity toward sulfamethazine from water, which increased with the increase of contact temperature. Langmuir isotherm fitted the equilibrium data better, and the kinetic data (within 45 min) were well-analyzed by the pseudo-second-order kinetic model. Also, the specific adsorption property of the nanoadsorbent was greatly improved through the surface-grafting, which exhibited excellent selectivity to sulfamethazine compared with other reference antibiotics. Efficient magnetic separation and good reuse of the nanoadsorbent provided the potential possibility for selective recognition and fast removal of antibiotic pollutions from water environments. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40854.
研究领域:
材料科学
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环境科学
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分子生物学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 33
·46637
·
IF 1.901
Haibo Zhang,Jianxin Jiang,Shibin Shang,Zhanqian Song,Jie Song
A novel, hydrophobically modified cationic polyacrylamide (HMPAM) was synthesized via the copolymerization of acrylamide, diallyl dimethyl ammonium chloride (DMDAAC), and diallylmethyl dehydroabietic acid propyl ester ammonium bromide. Optimum conditions for preparing HMPAM were such that the amount of initiator was 0.075 wt % of the total monomer mass, the monomer concentration was 20 wt %, and the amount of DMDAAC was 18 mol % of the total monomer molar mass. HMPAM was characterized with an UV–visible spectrometer, 1 H-NMR, Ubbelohde viscometer, rotational viscometer, and rotational rheometer. HMPAM solutions exhibited strong hydrophobic associations, and the critical association concentration of the HMPAM aqueous solution was about 0.7 wt %; the HMPAM solutions also showed salt thickening and shear resistance. The surface morphologies of the freeze-dried HMPAM samples (1 wt %) were also observed via scanning electron microscopy. Compared with unmodified cationic polyacrylamide, Synthesis of HMPAM-0.5 exhibited a stronger flocculation capacity, and the optimal transmittance of the supernatants was above 95%. HMPAM-0.5 showed significant flocculation performances for 3–4 and 3–5 wt % kaolin suspensions at 40 and 50 mg/L, respectively. Moreover, the flocculation performance was enhanced with the addition of NaCl and CaCl 2 . © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46637.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 15
·
IF 1.64
Hangjun Deng,Zhongquan Shen,Lifeng Li,Hong Yin,Jizhong Chen
The polymerization of tetrahydrofuran (THF) was carried out in CH 2 Cl 2 by using phosphotungstic heteropolyacid as initiator and epichlorohydrin as promoter. This cationic ring-opening polymerization process was monitored by in situ mid-infrared spectroscopy system (ReactIR) to further study the thermodynamics and kinetics of THF polymerization. It was observed that the sharp infrared peak of C O C stretching vibrations will shift from about 1068 to 1109 cm −1 in THF ring-opening step. The changes in absorbance intensity of the two characteristic peaks were used for determining instantaneous concentration of linear polymer and ring monomer. The experimental results demonstrated that the kinetics of THF polymerization proved to be typically first-order. Thermodynamic parameters were determined from the temperature dependence of the monomer equilibrium concentration [M] e over the range from −5 to 25°C. The values of k app were obtained via the plots of ln{([M] 0 −[M] e )/([M] t −[M] e )} vs reaction time, for polymerization under specific conditions. The apparent activation energy ( E a ) and frequency ( A ) were determined from the Arrhenius plot of k app vs. T −1 . Besides, the in situ kinetic investigation revealed that more chain-transfer occurred at higher temperatures, leading to a reduction in propagation species concentration and a deviation from first-order propagation at the later stage of polymerization. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40503.
研究领域:
高分子化学
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物理化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 16
·46117
·
IF 1.86
Ping Shao,Zhipeng Yan,Hangjun Chen,Jie Xiao
Electrospun ultra-fine poly(vinyl alcohol)/permutite fibrous film loaded with cinnamaldehyde essential oil was successfully fabricated.The morphology of fibrous filmswas characterized by scanning electron microscopy (SEM) and atomic force microscope (AFM). The fibrous film exhibited microstructure features with high porosity with the pore size distributed ranging from 1.7 nm to 56.7 nm. And the root-mean-squared roughness of fibers lifted to 546.5 nm when the addition of cinnamaldehyde essential oil (CEO) reached 0.25 mL. Attenuated total reflectance-fourier transform infrared (ATR-FTIR) spectroscopyconfirmed the existence of CEO in fibrous films and revealed physical interaction rather than chemical interactions existing between the film matrix and CEO. Endothermic peaks presented in differential scanning calorimetry (DSC) profile were probably rooted from existed mesoporous adsorption between the highly porous film matrix and CEO. Furthermore, the PVA/permutite/CEO fibrous film prolonged the shelf life of strawberries, confirming that the PVA/permutite/CEO fibrous film may be of interest for the development of active food packaging. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46117.
研究领域:
材料科学
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食品科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 18
·
IF 1.768
Yan-Ling Luo,Jun Zhang,Fang-Jie Han,Feng Xu,Ya-Shao Chen,Ru Liu
Thermoresponsive poly( N -isopropyl acrylamide) (PNIPAM)- block -hydroxy-terminated polybutadine- block -PNIPAM triblock copolymers were synthesized by atom transfer radical polymerization; this was followed by the in situ epoxidation reaction of peracetic acid. The copolymers were characterized by 1 H-NMR, Fourier transform infrared spectroscopy, and size exclusion chromatography measurements, and their physicochemical properties in aqueous solution were investigated by surface tension measurement, fluorescent spectrometry, ultraviolet–visible transmittance, transmission electron microscopy observations, dynamic light scattering, and so on. The experimental results indicate that the epoxidized copolymer micelle aggregates retained a spherical core–shell micelle structure similar to the control sample. However, they possessed a decreased critical aggregate concentration (CAC), increased hydrodynamic diameters, and a high aggregation number and cloud point because of the incorporation of epoxy groups and so on. In particular, the epoxidized copolymer micelles assumed an improved loading capacity and entrapment efficiency of the drug, a preferable drug-release profiles without an initial burst release, and a low cytotoxicity. Therefore, they were more suitable for the loading and delivery of the hydrophobic drug as a controlled release drug carrier. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41877.
研究领域:
材料科学
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药学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 28
·46478
·
IF 1.901
Chun-Ying Chao,Ye-Fei Feng,Kai Hua,Hao Li,Li-Jun Wu,Yi-Sha Zhou,Zhen-Wei Dong
Organic–inorganic coating polypropylene separators were developed by introducing SiO 2 nanoparticles through sol–gel process, where polydopamine was used as an intermediate layer. Scanning electron microscopy results showed the coating layers have highly porous structure, which was beneficial for liquid electrolyte uptake. Compared with pristine polypropylene separator, the ceramic separators showed improved thermal stability, higher ionic conductivity, and lower interfacial impedance. The cells employing the ceramic separators delivers excellent discharge capacity (retention = 75%) and coulombic efficiency up to 98% at 2 °C rate after 100 cycles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46478.
研究领域:
材料科学
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能源存储
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 19
·
IF 1.866
Jinyuan Wang,Chaoying Wan,Yong Zhang,Yinghao Zhai,Shiqiang Song,Wentan Ren,Zonglin Peng
Commercial brominated poly(isobutylene- co -isoprene) (BIIR) rubber has been directly used for the initiation of atom transfer radical polymerization (ATRP) by utilizing the allylic bromine atoms on the macromolecular chains of BIIR. The graft copolymerization of methyl methacrylate (MMA) from the backbone of BIIR which was used as a macroinitiator was carried out in xylene at 85 °C with CuBr/ N , N , N ′, N ″, N ″-pentamethyldiethylenetriamine as a catalytic complex. The polymerization conditions were optimized by adjusting the catalyst and monomer concentration to reach a higher monomer conversion and meanwhile suppress macroscopic gelation during the polymerization process. This copolymerization followed a first-order kinetic behavior with respect to the monomer concentration, and the number-average molecular weight of the grafted poly(methyl methacrylate) (PMMA) increased with reaction time. The resultant BIIR- graft -PMMA copolymers showed phase separation morphology as characterized by atomic force microscopy, and the presence of PMMA phase increased the polarity of the BIIR copolymers. This study demonstrated the feasibility of using commercial BIIR polymer directly as a macromolecular initiator for ATRP reactions, which opens more possibilities for BIIR modifications for wider applications. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43408.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 31
·
IF 1.768
Fengquan Sun,Minjia Meng,Li Yan,Zhihui He,Yongsheng Yan,Yan Liu,Shijuan Liu
Highly selective, ordered microporous molecularly imprinted membranes (MIMs) for phenol were synthesized by breath figure (BF) method using styrene-acrylonitrile copolymer (SAN) as the membrane matrix and molecularly imprinted polymer nanoparticles (nano-MIPs) as the imprinted nanoparticles. The nano-MIPs were synthesized by oil-in-water emulsion polymerization using 4-vinyl pyridine (4-VP), methyl methacrylate (MMA) or cinnamic acid (CA) as the functional monomer, respectively. The prepared nano-MIPs were characterized by transmission electron microscope (TEM) and Raman, whereas MIMs were characterized by SEM, membrane flux, and selective adsorption experiments. Morphological analysis exhibited that the addition of nano-MIPs improved the formation of ordered and well-defined porous membrane morphology. Compared with MMA-MIM and CA-MIM, the 4-VP-MIM exhibited higher membrane flux, adsorption capacity, and stronger selective binding for phenol as well as excellent permeation selectivity for phenol. Moreover, the selective effect of 4-VP-MIM on phenol was strongly affected by the amount of 4-VP imprinted nanoparticles (nano-4-VP-MIPs). The experimental data revealed that the 4-VP-MIM containing 2.0 wt % of nano-4-VP-MIPs exhibited the highest separation selectivity for the template phenol, whose selectivity coefficients for phenol relative to salicylic acid (SA) and p -hydroxybenzoic acid ( p -HB) were 5.6770 and 5.5433, respectively, which was close to the predicted selectivity coefficient value. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42350.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 30
·50736
·
IF 3.125
Mingliang Zhang,Lin Zhang,Zhihui Wu,Ao Ding,Chunhui Shen,Shanjun Gao
A series of alkaline anion exchange membranes (AAEMs) based on poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with multi-cation side chain containing piperidinium group were fabricated via nucleophilic substitution and Menshutkin reaction. The chemical structures of the AAEMs (PPO-AMP-X) were determined by Fourier transform infrared and proton nuclear magnetic resonance spectra. The resultant PPO-AMP-X membranes with the ion exchange capacities (IECs) of 2.05–2.77 mmol g −1 displayed the hydroxide conductivities in the range of 61.04–78.92 mS cm −1 at 80°C. When tested at the same degree of functionalization levels, the PPO-AMP-X membranes exhibited significantly higher hydroxide conductivity and lower conductivity loss than conventional AAEMs bearing benzyltri-methylammonium group (PPO-TMA). The PPO-AMP-28 multi-cation membrane showed a hydroxide conductivity of 70.52 mS cm −1 at 80°C, which was nearly two times higher than that of the PPO-TMA-28 single-cation membrane (36.74 mS cm −1 ). Compared with PPO-TMA-28 (56.76% decrease), the hydroxide conductivity of PPO-AMP-28 merely decreased by 23.15% after soaked in 1 M KOH at 80°C for 500 h. Additionally, the PPO-AMP-X membranes displayed moderate mechanical properties and good thermal stabilities, which can meet the basic requirements for use in fuel cells. This study provides a facile method for preparing AAEMs with multi-cation side chain containing piperidinium group.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）