JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 11
·
IF 1.64
Jianing Li,Zhiqiang Cheng,Mengzhu Liu,Mingyue Zhang,Meijuan Hu,Li Zhang,Haifeng Jiang,Junfeng Li
A simple and efficient procedure has been developed to fabricate ZnO nanofibers with dendritic structure via electrospinning and subsequent calcination. The spinning solution is prepared by mixing polyvinylpyrrolidone (PVP) and zinc acetate into methanol. From SEM images, it can be observed that the ZnO product has a tendency of dendritic structure. The diameter of the dendritic branch is ∼137 nm. The structure and physicochemical property of the prepared nanofibers are elucidated by TGA, SEM, XRD, FTIR, and PL, respectively. The photoluminescene measurement of the ZnO samples exhibit a broad visible emission band concentrate on around 430–580 nm. Meanwhile, the intensity is related to the content of surface oxygen vacancies, which probably influence photocatalytic activity of ZnO samples. Whereafter, the photocatalytical activity of the ZnO nanofibers is evaluated by quantifying the degradation of methyl blue. The result indicates that ZnO nanofibers annealed at 650°C show an excellent photocatalytic activity. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41627.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 10
·
IF 1.64
Hao Li,Ping Yu,Haigang Li,Yunbai Luo
Membrane-based separation technology is one of the most active separation technologies being employed in water treatment. Polyamides (PA) are widely used membrane materials because they exhibit excellent performance, such as high flux with high salt rejection, and enhanced stability against wide range of pH and temperature. Unfortunately, PA membranes exhibit extremely poor resistance to chlorine leading to increased operation costs and decreased membrane lifetime. In this study, we find new ways for prolonging membrane lifetime and reducing the operating costs by investigating the chlorination and modification of PA membranes. Varying concentrations of hypochlorite were used to chlorinate a commercial reverse osmosis membrane (BW-30, DOW). The results showed that short-time exposure to high concentrations of hypochlorite could cause more serious problems to membranes than long-time exposure to low concentrations under the similar total exposure. The performance of the chlorinated membranes was recovered to some extent after treatment with NaOH solution (pH 10), indicating that the alkali treatment could initiate the reversible regeneration of chlorinated membranes. Furthermore, an industrial grade epoxy resin was used to modify the membranes to enhance the chlorine resistance via the reaction between the amide nitrogen and epoxy bond. The successful modifications were confirmed by attenuated total reflectance Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy. Moreover, the chlorination tests showed that the modifications performed in these experiments enhanced the chlorine resistance of the membranes, especially for the membranes exposed to low concentration of chlorine. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41584.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 9
·
IF 1.64
Weihua Fan,Yue Zhao,Aijing Zhang,Yukun Liu,Yanxia Cao,Jinzhou Chen
Poly(lactic acid) (PLA)/nano zinc oxide/copper chlorophyll acid (CCA) antibacterial nanocomposites with excellent mechanical properties were prepared in the presence of a chain extender named tolylene diisocyanate (TDI). The effect of the chain extender on the PLA long chain was confirmed by the increased molecular weight shown in the mass flow rate and gel permeation chromatography. Escherichia coli were adopted to examine the antibacterial ability of the blends. The effect of CCA is also discussed with regard to the enhancement of the antibacterial effect of zinc oxide (ZnO) over E. coli . Scanning electron microscopy and transmission electron microscopy were used to view the agglomeration and dispersion of ZnO in the PLA matrix. Differential scanning calorimetry and thermogravimetric analysis revealed a relatively stable thermal performance of the nanocomposites with and without TDI. A sharp increase in the mechanical properties was also observed after the addition of the chain extender under different processing conditions. Additionally, we found that the nanocomposites with the incorporation of TDI and the masterbatches in batches effectively improved the mechanical properties of PLA/ZnO/CCA without a sacrifice of the antibacterial effect. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41561.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 9
·
IF 1.64
Juhua Guo,Sujuan Pan,Xiaochun Yin,Yu-Feng He,Tao Li,Rong-Min Wang
Using feather keratin as biocompatible and inexpensive natural biopolymer and methacrylic acid as a functional monomer, we prepared a pH-sensitive feather-keratin-based polymer hydrogel (FKPGel) with grafted copolymerization. The obtained FKPGel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The swelling behavior and pH sensitivity of the FKPGel were investigated. When the small molecule (rhodamine B) and macromolecule (bovine serum albumin) were used as model drug molecules, the FKPGel exhibited controllable release behavior in vitro, and the hydrogels had pH sensitivity. For a small molecular drug, the cumulative release rate was 97% in 24 h at pH 8.4. For macromolecular drug, the cumulative release rate reached 89% at pH 7.4. Its release behavior could be controlled by the pH value. In summary, a simple method was found to reuse disused feathers. It is a kind of pH-sensitive hydrogels to be applied in drug-delivery systems. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41572.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 9
·
IF 1.64
Haicun Yang,Liu Zhang,Wenzhong Ma,Hongting Pu,Fanghong Gong
A series of polymer–clay nanocomposites consisting of polystyrene (PS) and attapuglite (ATP) were prepared successfully. First, silane coupling agent containing aromatic tertiary amine groups was synthesized to functionalize ATP (M-ATP). Then, PS nanocomposites with varied clay loadings were prepared via in situ suspension polymerization process with a redox initiation system consisting of aromatic tertiary amine and benzoyl peroxide. The synthesis of silane coupling agent and functionalization of ATP were confirmed by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectra, and X-ray photoelectron spectroscopy. Mechanical properties, morphology, thermal stability, and rheological behavior of nanocomposites were investigated to illuminate the effects of M-ATP on the structure and properties of nanocomposites. Field-emission scanning electron microscope images revealed an ideal dispersion of M-ATP and an enhanced toughness of nanocomposites. The improved interface interaction between M-ATP and PS matrix endowed the nanocomposites with outstanding mechanical properties and thermal stability. The formation of hybrid network in the nanocomposites containing 3 wt % M-ATP resulted in higher complex viscosity (η*), storage modulus ( G ′), and lower loss factor (tanδ) compared with the pristine PS and PS/ATP nanocomposites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41567.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 13
·
IF 1.64
Yang Cao,Lukuan Liu,Wanzhen Xu,Xiangyang Wu,Weihong Huang
The preparation of indole molecularly imprinted polymers (indole-MIPs) using 4-vinylpyridine as functional monomer, silica gel as matrix were used to adsorb indole from fuel oil specifically. The reverse atom transfer radical polymerization (RATRP) technology was introduced to prepare the surface molecularly imprinted polymers, and the precipitation polymerization was adopted in the preparation process. The obtained indole-MIPs were characterized by nitrogen adsorption, Fourier transform infrared spectrometry and scanning electron microscopy. The results show that indole-MIPs were provided with the larger surface areas and more pores. The adsorption capacity of indole-MIPs was 31.80 mg g −1 at 298 K, and the adsorption equilibrium was reached in a short time. The adsorption process was spontaneous by thermodynamic analysis, and an appropriate decrease in temperature could enhance the adsorption capacity. The adsorption process obeyed pseudo-second-order kinetic model by kinetics analysis. The isotherm analysis results show that both Langmuir and Sips equations were suitable to experimental data. The selective adsorption and reusable performance of indole-MIPs were favorable. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40473.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 12
·
IF 1.64
Wenliang Li,Wenjing Zhang,Xiuyun Yang,Zhigang Xie,Xiabin Jing
A series of four-arm star block copolymers poly(ethylene glycol)-block-poly( d,l -lactide) (PEG-PDLLA) with different hydrophobic length were synthesized by ring-opening polymerization of lactide and characterized using 1 H NMR and gel permeation chromatography (GPC). These copolymers could self-assemble in aqueous solution to form the vesicle structure with controlled size and morphologies. Transmission electron microscopy (TEM) and DLS show the polymersomes are spherical with diameter of 70∼500 nm. The polymersomes made by direct hydration of copolymer thin films in water exhibit the controllable ability of encapsulating hemoglobin under mild condition. The hemoglobin content in the polymersomes could reach to 35 wt %. More importantly, the encapsulated hemoglobin keeps its own bioactivity and is capable of binding oxygen. This hemoglobin-encapsulated four-arm PEG-PLA polymersomes could have the potential to be applied as an artificial oxygen carrier for transfusion. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40433.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 12
·
IF 1.64
Huilong Guo,Mangeng Lu,Liyan Liang,Jian Zheng,Yunfei Zhang,Yinwen Li,Zhaoxia Li,Chenghua Yang
In this work, a high performance liquid crystalline epoxy composite was prepared and the effect of the alignment of LCE with long lateral substituent on the carbon fiber surface curing at low temperature on fracture toughness, dynamic mechanical, and thermal properties of liquid crystalline epoxy with lateral substituent (LCE6) was investigated by polarized optical microscopy (POM), wide angle X-ray diffraction measurements (WAXS), dynamic mechanical analysis (DMA), thermogravimetric (TGA), and scanning electron microscopy (SEM). Curing degree of the composite was observed by FTIR. The experimental results indicate that the fracture toughness, glass transition temperature ( T g ), thermal stability, degradation kinetics are associated with the alignment of LCE6 along long axis of carbon fiber. The alignment of LCE6 on carbon fiber surface can increase mesogen network density, which leads to higher fracture toughness, higher thermal stability, increase of the activation energies and higher T g of the composite. The dynamic mechanical analysis shows that the compoaite possesses extremely higher dynamic storage moduli, which indicates that this LCE6/DDM/CF composite can be a high performance composite. Thus, the compoaite can be a potential candidate for advanced composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40363.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 13
·
IF 1.64
Liling Dong,Hailong Peng,Shenqi Wang,Zhong Zhang,Jinhua Li,Fanrong Ai,Qiang Zhao,Mei Luo,Hua Xiong,Lingxin Chen
Novel thermally and magnetically dual-responsive mesoporous silica nanoparticles [magnetic mesoporous silica nanospheres (M-MSNs)–poly( N -isopropyl acrylamide) (PNIPAAm)] were developed with magnetic iron oxide (Fe 3 O 4 ) nanoparticles as the core, mesoporous silica nanoparticles as the sandwiched layer, and thermally responsive polymers (PNIPAAm) as the outer shell. M-MSN–PNIPAAm was initially used to control the release of sophoridine. The characteristics of M-MSN–PNIPAAm were investigated by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry, N 2 adsorption–desorption isotherms, and vibrating specimen magnetometry analyses. The results indicate that the Fe 3 O 4 nanoparticles were incorporated into the M-MSNs, and PNIPAAm was grafted onto the surface of the M-MSNs via precipitation polymerization. The obtained M-MSN–PNIPAAm possessed superparamagnetic characteristics with a high surface area (292.44 m 2 /g), large pore volume (0.246 mL/g), and large mesoporous pore size (2.18 nm). Sophoridine was used as a drug model to investigate the loading and release properties at different temperatures. The results demonstrate that the PNIPAAm layers on the surface of M-MSN–PNIPAAm effectively regulated the uptake and release of sophoridine. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40477.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 12
·
IF 1.64
Xi-Xiang Deng,Zhong Chen,Qiang Huang,Xiong Fu,Chuan-He Tang
Microencapsulation is an effective strategy to improve the storage stability of β - carotene. This article investigated the potential and effectiveness of soy protein isolate (SPI) and octenylsuccinic anhydride-modified starch (MS), alone or in combination (1:1, w/w), to encapsulate β - carotene by spray drying. The results indicated that the microcapsule with MS exhibited much lower encapsulation efficiency (NE) and poorer dissolution behavior, but much better redispersion behavior, than that with SPI or its blends with MS. The NE was basically unaffected by total solid content (TC) or core/wall ratio; increasing the TC impaired the dissolution and/or redispersion behavior. The dispersion behavior was closely associated with the morphology of the microcapsules. The encapsulated β - carotene suffered a progressive loss upon storage under high humid or temperature environment, but it exhibited extraordinary stability at low temperatures (e.g., 4°C). The β - carotene degradation was independent of sunlight. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40399.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 11
·
IF 1.395
Juan Wang,Jiangdong Dai,Minjia Meng,Zhilong Song,Jianming Pan,Yongsheng Yan,Chunxiang Li
To achieve selective recognition of water-soluble ciprofloxacin (CIP), an effective method was developed for the preparation of surface molecularly imprinted polymers based on the yeast particles (yeast@MIPs) via atom transfer radical emulsion polymerization (ATREP). The reactions were carried out in the nontoxic and green emulsion system at room temperature, which was environment friendly with low energy consumption. In this study, the yeast, for the advantages of low cost, easily available source and abundant active groups on the cell wall, was selected as an ideal biological support substrate. The prepared yeast@MIPs was characterized by FT-IR, SEM, TEM, EDS, and elemental analysis techniques. Batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics, selective recognition, and reuse ability of yeast@MIPs. The experimental static adsorption data of CIP on to yeast@MIPs were well-described by Langmuir, Freundlich, and pseudo-second-order models. The maximum static adsorption capacity for CIP of yeast@MIPs was 18.48 mg g −1 , and the adsorption equilibrium could be reached in 60 min. The selectivity coefficients for CIP relative to enrofloxacin, tetracycline, and sulfadiazine were 1.212, 2.002, and 10.65, which demonstrated CIP of high affinity and selectivity over three competitive antibiotics. In addition, the reusability of the material without obvious deterioration (8.52% loss) in performance was observed at least four repeated cycles. And the yeast@MIPs was used to determine CIP from spiked shrimp samples by HPLC analysis. These results showed that yeast was a well-defined substrate and ATREP was a promising technique for the preparation of surface molecularly imprinted polymers targeting templates. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40310.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 11
·
IF 1.395
Yi Cao,Dangsheng Xiong,Yuxiang Niu,Yi Mei,Zhaowei Yin,Jianchao Gui
Tissue engineering for articular cartilage repair has shown success in ensuring the integration of neocartilage with surrounding natural tissue, but the rapid restoration of biomechanical functions remains a significant challenge. The poly(vinyl alcohol) (PVA) hydrogel is regarded as a potential articular cartilage replacement for its fair mechanical strength, whereas its lack of bioactivity limits its utility. To obtain a scaffold possessing expected bioactivity and initial mechanical properties, we herein report a novel salt-leaching technique to fabricate a porous PVA hydrogel simultaneously embedded with poly(lactic- co -glycolic acid) (PLGA) microspheres. Through the investigation of environmental scanning electron microscopy, we found that the porous PVA/PLGA scaffold was successfully manufactured. The compression and creep properties were also comprehensively studied before and after cell culturing. The relationship between the compressive modulus and strain ratio of the porous PVA/PLGA scaffold showed significant nonlinear behavior. The elastic compressive modulus was influenced a little by the porogen content, whereas it went higher with a higher PLGA microsphere content. The cell-cultured scaffolds presented higher compressive moduli than the initial ones. The creep resistance of the cell-cultured scaffolds was much better than that of the initial ones. In all, this new scaffold is a promising material for articular cartilage repair. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40311.
✓ 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）