JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 1
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IF 1.64
Chongjing Liao,Tao Fang,Shanshan Luo,Guo-Zhi Fan,Guangsen Song
The preparation of partial acetylation of cellulose derived from rice straw was catalyzed by phosphotungstic acid with various numbers of crystal water, and H 3 PW 12 O 40 ·4H 2 O was found to be as effective catalyst. The yield of the cellulose acetate was significantly enhanced by converting cellulose directly isolated from rice straw into microcrystalline cellulose before acetylation. The optimization of the acetylation was investigated by varying the amount of catalyst and acetic anhydride as well as reaction conditions including reaction time and medium, and a degree of substitution (DS) value of 2.29 and yield of 62.9% were obtained under the optimized conditions. The structure and the formation of the acetylated product were confirmed by Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD) technique, the thermal properties were determined by thermal analysis including thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC), and the morphology was observed by scanning electron microscope (SEM). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41212.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 23
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IF 1.64
Xiaoli Zhan,Guangfa Zhang,Qinghua Zhang,Fengqiu Chen
Novel well-defined amphiphilic fluorinated diblock copolymers P(PEGMA- co -MMA) -b- PC 6 SMA were synthesized successfully by RAFT polymerization and characterized by FTIR, 1 HNMR and GPC. For copolymer coatings, static contact angles, θ, with water (θ water ≥ 109.5 ° ) and n -hexadecane (θ hexadecane ≥ 68.9 ° ) pointed to the simultaneous hydrophobic and lipophobic characteristics of the copolymer surfaces. Dynamic contact angle measurements indirectly demonstrated that copolymer films underwent surface reconstruction upon contact with water, which results in a surface with surface coverage of polar PEG units. Moreover, the distinct nanoscale microphase segregation structures were proved by atomic force microscopy (AFM) images. Finally, using bovine serum albumin (BSA–FITC) as the model protein, copolymers exhibited excellent protein adsorption resistance. It is believed that the combination of surface reorganization and nanometer-scale microphase segregation structure endows the excellent protein resistance for amphiphilic fluorinated copolymers. These results provide deeper insight of the effect of surface reconstruction and microphase segregation on the protein adsorption behaviors, and these amphiphilic fluoropolymers can expect to have potential applications as antifouling coatings in the field of marine and biomedical. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41167.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 21
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IF 1.64
Ming-Mao Chen,Yu-Qing Huang,Hao Guo,Yan Liu,Jian-Hua Wang,Jiu-Lin Wu,Qi-Qing Zhang
To reuse fish processing waste for biomedical materials, collagen (Col) was extracted from silver carp skin, and Col–chitosan (Ch) composite sponges were prepared by a freeze-drying method. The atomic force microscopy and electrophoresis results suggest the Col might have been type I. To obtain the optimum conditions for the manufacture of the Col–Ch sponges, the characteristics of sponges composed of different ratios of Col to Ch with different crosslinkers were evaluated. Scanning electron microscopy showed that the sponges had an interconnected network structure with porosity. Infrared spectroscopy demonstrated that intermolecular crosslinkages between Col and Ch occurred. The swelling measurements implied that all of the sponges could bind an 18- to 36-fold amount of distilled water and still maintain their form and stability. When the ratio of Col to Ch was higher than 1:0.25, the swelling and degradation rate decreased with increasing Ch. Cell proliferation, hemolysis, and hemostasis assay indicated that the sponges exhibited noncytotoxicity, biocompatibility, nonhemolysis, and hemostatic efficacy. Overall, we concluded that the optimal ratio of Col and Ch for the sponges was 1:0.25, and glutaraldehyde crosslinking was more suitable than 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride. These results demonstrate the potential application of silver carp skin Col–Ch sponges for tissue engineering and wound dressing in non-weight-bearing tissue. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40998.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 22
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IF 1.64
Haicun Yang,Hongting Pu,Fanghong Gong
Poly(methyl methacrylate) (PMMA) was bonded on the surface of attapulgite (ATP) by using an ammonium persulfate amine redox initiation system via grafting from approach. ATP was modified with (3-aminopropyl)triethoxysilane to anchor amine groups on the surface, and then the amine-functionalized ATP was further treated with methacryloyl chloride and 4,4′-azobis(4-cyanovaleric acid) to give methacryl- and azo-functionalized ATP, respectively. Subsequently, surface-initiated graft polymerization of MMA in a soap-free emulsion was performed to afford ATP/PMMA hybrids. Meanwhile, graft polymerizations on the surface of methacryl- and azo-functionalized ATP were carried out for comparison. The grafting of PMMA on the surface of ATP was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA). The crystal structure of hybrids was characterized by X-ray diffraction analysis. The morphology of hybrids was observed by scanning electron microscopy and transmission electron microscopy. The degree of grafting obtained from surface-initiated graft polymerization in a soap-free emulsion was found to be the greatest (29.4%) estimated from TGA. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41062.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 21
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IF 1.64
Yan Wu,Yong Deng,Qiulin Yuan,Ying Ling,Haoyu Tang
A series of thermoresponsive poly(γ-propyl- L -glutamate)-graft-(oligo ethylene glycol)s (PPLG-g-OEGs) with different main-chain and side-chain lengths have been synthesized via copper-mediated alkyne-azide 1,3-dipolar cycloaddition between poly(γ-azidopropyl- L -glutamate)s (PAPLG) and propargyl terminated oligo ethylene glycols (Pr-OEGs). Fourier transform infrared spectrometer analysis revealed that PAPLG 10 adopted 39.4% β-sheet, 47.4% α-helix, and 13.2% random coil while PAPLG with longer main-chain length (DP = 37 and 88) and PPLG-g-OEGs adopted exclusive α-helix in the solid state. Circular dichroism analysis revealed that PPLG-g-OEGs adopted α-helical conformations with helicities in the range of 50∼100%. The thermoresponsive behaviors of PPLG-g-OEGs in water have been studied by dynamic light scattering. The polymer concentration, main-/side-chain length, and helicity collectively affected their cloud point temperatures. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41022.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 3
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IF 1.768
Hu Li,Jingcheng Liu,Xiangfei Zheng,Changwei Ji,Qidao Mu,Ren Liu,Xiaoya Liu
Novel branched copolymers, poly(styrene- alt -maleic anhydride) (BPSMA), were synthesized through mercapto chain-transfer polymerization with styrene, maleic anhydride (MA), and 4-vinyl benzyl thiol (VBT). Then, the hydroxyl of hydroxyethyl methacrylate was reacted with MA to synthesize branched photosensitive copolymers, p -BPSMAs. Fourier transform IR spectroscopy and 1 H-NMR indicated that the synthesis was successful. Gel permeation chromatography indicated that the molecular weight decreased with increasing content of VBT. The thermal properties were characterized by thermogravimetric analysis; the results show that the thermal decomposition temperature of the BPSMAs was greatly enhanced. Real-time IR was used to evaluate the UV-curable kinetics of the p -BPSMAs; the results show that the p -BPSMAs could rapidly photopolymerize under UV irradiation in the presence of photoinitiators. Moreover, the photoresist based on the p -BPSMAs exhibited improved photosensitivity when the VBT content increased, and the photoresist with 12 mol % VBT content had a low value of the dose that retained 50% of the original film thickness (10 mJ/cm 2 ), and a 50-μm resolution could be achieved compared to a linear photoresist. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42838.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 3
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IF 1.768
En Xiang Liang,Mang Lu,Zhao Hui Hou,Yan Huang,Bin Hong He,Guo Xiang Wang,Li Chao Liu,Hu Wu,Ming Zhong
Titanium dioxide (TiO 2 )/graphitic carbon nitride (g-C 3 N 4 ) composites were first used as photoinitiator for photochemically mediated controlled/living polymerization of methyl methacrylate. The polymerization was successfully carried out in polyethylene glycol at room temperature with FeCl 3 ·6H 2 O/ N,N,N ′,N ′,N ″-pentamethyldiethylenetriamine as complex catalyst and ethyl 2-bromoisobutyrate as initiator in this case. A pseudo-first-order dependence of the monomer concentration on the polymerization time was observed. TiO 2 /g -C 3 N 4 was verified to be an efficient photoinitiator. The polymerization was controlled to produce poly(methyl methacrylate) with narrow molecular weight distribution and controlled number average molecular weight ( M n ,GPC ). The M n ,GPC matched well with the theoretical values when using both UV and sunlight irradiation as light source. The effects of reaction conditions on the polymerization were investigated. The polymerization could be started and stopped through periodically switching on/off the light. The living nature was further supported by the chain extension experiments. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42891.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 1
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IF 1.768
Caideng Yuan,Mingtong Cui,Longlong Feng,Jingpeng Wang,Yan Peng
An amino-functionalized nano-adsorbent (DETA-MNPs) was prepared by a process involving: (1) synthesis of superparamagnetic Fe 3 O 4 nanoparticles; (2) introduction of amino groups after which ATRP initiator was anchored; (3) grafting of glycidyl methacrylate (GMA) via SI-ATRP; and (4) ring-opening reaction of epoxy groups with diethylenetriamine (DETA). The nano-adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM) and applied to remove Cu(II) in batch experiments. The effects of pH, Cu(II) concentrations, solution ionic strength, and contact time were investigated. The results show that the DETA-MNPs are spherical with cubic spine structure, high saturation magnetization (41.9 emu g −1 ), and an average diameter of 10 nm. The maximum Cu(II) adsorption capacity achieves 83.33 mg g −1 at pH 5.0 by Langmuir model. The adsorption process is highly pH-dependent and reaches equilibrium within 20 min. Furthermore, the DETA-MNPs exhibit excellent dispersibility and reusability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42859.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 11
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IF 1.768
Ye Yuan,Shaokun Song,Sufen Deng,Qin Wang,Qisong Feng,Chuanxi Xiong,Lijie Dong
Exploration of new functionalization approaches to inert rigid fiber, activation inert surface, and enhancing interface adhesion is urgently required for fiber-based multiphase materials. In this paper, we developed a simple yet efficient method towards active functionalized poly( p -phenylene terephthalamide) fiber through mussel-adhesive, self-polymerization, and successive dipping–drying procedure based on as-designed detachable equipment. In comparison with current acid etching and high energy radiation methods, the active functional strategy achieves scatheless functional modification to inert rigid fiber. Attribute to π–π conjugation effect, the new active nanolayers integrate rigid fiber and polymer matrix into homogeneous-like structure. Consequently, the functionalized fiber-based composites exhibit great mechanical property and desirable field-responsive ability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43018.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 29
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IF 1.768
Lei Wang,Wen Huang,Shijie Wang,Yuezhi Cui,Pengfei Yang,Xiaodeng Yang,Jonathan V. M. Weaver
pH-Responsive amphiphilic branched copolymers were prepared from poly(ethylene glycol) methyl ether methacrylate (PEGMA), 2-(diethylamino)ethyl methacrylate (DEAEMA), 2-( tert -butylamino)ethyl methacrylate ( t BAEMA), and ethylene glycol dimethacrylate (EGDMA) utilizing a thiol-modified free radical polymerization. The molecular structures of copolymers were confirmed by proton nuclear magnetic resonance spectroscopy ( 1 H NMR) and triple-detection gel permeation chromatography (tri-GPC). The aqueous solution behaviors of the obtained copolymers were investigated by dynamic light scattering (DLS). The DLS data showed that about 16 nm polymer particles comprising of hydrophobic poly( tert -butylamino)ethyl methacrylate (P t BAEMA) and poly(diethylaminoethyl methacrylate (PDEAEMA) core, hydrophilic PEGMA corona were formed above pH 8. With the decrease of pH from 8 to 6, a dramatic increase in the hydrodynamic radius of polymer particles from 16 nm to 130 nm was observed resulting from the protonation of the PDEAEMA segment. Moreover, in vitro drug release behaviors of the resulting polymer assemblies at different pH values were also investigated to evaluate their potential as sustained release drug carriers. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42183.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 16
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IF 1.64
Li Li,Li-Ru Xia,He-Ye Wang,Xiao-Dong Bi
Bisphenol A based epoxy acrylate (BABEA), a commercial UV-curable material, was introduced as a crosslinker for the fabrication of an epoxy-functionalized monolithic polymer array through UV-initiated copolymerization with glycidyl methacrylate as the functional monomer and poly(ethylene glycol) 200 as the porogen. Scanning electron microscopy images showed that the monolithic poly(bisphenol A based epoxy acrylate- co -glycidyl methacrylate) [poly(BABEA- co -GMA)] exhibited a well-controlled skeletal and well-distributed porous structure. The α-fetoprotein (AFP) immunoaffinity monolithic polymer array prepared by the immobilization of AFP on epoxy-functionalized monolithic arrays was used as an immunosensor for chemiluminescent AFP detection. X-ray photoelectron spectroscopy results indicate that the AFP antibody was successfully immobilized on the monolithic poly(BABEA- co -GMA) array. With a noncompetitive immune-response format, the proposed AFP immunoaffinity array was demonstrated as a low-cost, flexible, homogeneous, and stable array for AFP detection. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41792.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 15
·
IF 1.64
Qian Ma,Yanfei Liu,Zhe Dong,Jianglang Wang,Xin Hou
Hydrophobic and nanoporous chitosan–silica composite aerogels with low density, high porosity, and superior oil absorbency were successfully prepared by a typical sol–gel method and a two-step hydrophobic treatment. The morphologies, porosity characteristics, mechanical properties, thermal stability, hydrophobicity, and oil absorbencies of the composite aerogels were systematically investigated. The nitrogen physisorption analysis showed that composite aerogels had large specific surface areas and uniform nanoporous structures. In addition, the composite aerogels could support 7000 times its own weight; this indicated the role of the supporting skeleton played by chitosan. The hydrophobicity and lipophilicity was demonstrated with a water contact angle of 137° and an oil contact angle of 0°. Importantly, the composite aerogel with 20 wt % chitosan had a relatively high oil absorbency of 30 g/g and could be reused up to 10 times. Therefore, the chitosan–silica composite aerogels in this study had a broad prospect to be used as efficient and recyclable oil absorbents. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41770.
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