JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 3
·1736-1742
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IF 1.395
Jun Liu,Hai-Feng Liu,Li Deng,Bing Liao,Qing-Xiang Guo
In this article, we report the enhanced anti-aging and mechanical properties of waterborne polyurethanes (WPUs) modified by lignin amines, which were prepared from lignins, formaldehyde, and diethylenetriamine via a Mannich reaction. When we introduced amino groups into the lignin, its solubility in water and reactivity with isocyanate was obviously improved. Consequently, the interaction between WPU and the lignin additive were promoted; this provided a higher mechanical performance, that is, a higher tensile strength and elongation at break. More importantly, the intrinsic antioxidative activity of lignin also benefitted the modified WPU in terms of aging resistance. According to artificial accelerated aging tests, mechanical measurement, attenuated total reflectance–Fourier transform infrared spectroscopy, and scanning electron microscopy analysis, the lignin amine modified WPU did not show any evidence of degradation after 2 months of artificial accelerated aging, whereas the pure WPU was obviously degraded. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1736–1742, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 3
·1524-1529
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IF 1.395
Chaorong Li,Shunxin Shu,Rui Chen,Benyong Chen,Wenjun Dong
Nanofibers of natural cotton cellulose with a degree of polymerization above 10,000 were prepared by electrospinning; they were then functionalized with a rare-earth nano-oxide material of cerium dioxide (CeO 2 ) by means of the hydrothermal method to obtain the designated properties. The morphology, structure, and properties of the as-obtained nanocomposite fibers were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and ultraviolet (UV)–visible spectrophotometry. The results show that hydrothermally grown CeO 2 nanoparticles exhibited a polycrystalline cubic fluorite structure and could be dispersed uniformly on the surface of the cellulose nanofiber. The strong interface and electrostatic interactions between the nanoparticles and nanofibers effectively prevented nanoparticle fall-off. The modified natural cotton cellulose nanofibers showed excellent protection against UV radiation because of the function of the CeO 2 particles. Such cellulose nanocomposite materials could have potential applications in UV protection for data-storage or memory devices. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1524–1529, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 3
·1498-1502
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IF 1.395
Yulin Wang,Yuepeng Guan,Yin Yang,Peng Yu,Yaqin Huang
Gelatin (Gel) encapsulation onto activated carbon (AC) with catalase (CAT) was developed as an alternative method for CAT immobilization in this study. The immobilized CAT with AC encapsulated by Gel as the supporter accounted for 65.69% of the native enzyme activity. Furthermore, the properties of the immobilized CATs were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Among free CAT and the two immobilized CATs, the immobilized CAT with AC encapsulated by Gel as the supporter showed the highest relative enzymatic activity and a high stability in a broad range of pH values and temperatures, and its residual activity was 80% after 15 uses, whereas the immobilized CAT with AC as the supporter was retained at a level of only 50% under the same conditions. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1498–1502, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 2
·1328-1336
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IF 1.395
Ting Wang,Yong Yang,Chuanzhi Zhang,Zhaobin Tang,Haining Na,Jin Zhu
A series of 1,3,5-trialkyl-benzenetricarboxylamides (BTA-Rs) with different side-chain lengths of n -alkyl are synthesized to use as nucleating agents of poly (lactic acid) (PLA). Crystallization rate of PLA is detailed discussed in nonisothermal melt-crystallization with addition of the synthesized nucleating agents. Among these BTA-Rs, BTA-n-butyl (BTA-nBu) shows the most excellent nucleation ability for PLA. The influences of BTA-nBu on the nonisothermal melt-crystallization and cold-crystallization from the glassy state, isothermal crystallization, crystalline structure, and spherulite morphology of PLA are investigated. It is found that 0.8 wt % is the optimal weight fraction of BTA-nBu to improve the crystallization of PLA. In the case of isothermal melt-crystallization from melt, the addition of BTA-nBu shortens the crystallization half-time and speeds up the crystallization rate of PLA with no discernible effect on the crystalline structure. Besides, BTA-nBu nucleated PLA exhibits smaller spherulites size and larger nucleation density than that of pure PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1328-1336, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 2
·1415-1420
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IF 1.395
Zuolong Yu,Jiadong Zhou,Fei Cao,Binbin Wen,Xuan Zhu,Ping Wei
Poly(ethylene 2,5-furandicarboxylate- co -ethylene succinate) (PEFS) copolymers of 2,5-furandicarboxylic acid (FDCA) and succinic acid with 11.98–91.32 mol % FDCA composition were synthesized via melt polycondensation in the presence of ethylene glycol using tetrabutyl titanate as a catalyst. PEFSs' molecular weight, thermal properties, and molar composition were determined by Fourier transform infrared spectroscopy, gel permeation chromatography, intrinsic viscosity, 1 H NMR, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and wide-angle X-ray diffraction (WAXD) measurements. From experimental conditions, we obtained random copolymers with number-average molecular weights exceeding 25,600, determined by GPC and 1 H NMR analyses. DSC analysis revealed that PEFS copolymers' melting temperatures differed depending on EF units' percentage. TGA studies confirmed that all PEFS copolymers' thermal stability exceeded 300°C. From WAXD analysis, it is observed that the PEFS copolymer crystal structure was similar to that of PES when EF unit was 11.98 mol % and to that of PEF when EF units were 74.35 and 91.32 mol %. These results benefit this novel biodegradable copolymer to be used as a potential biomaterial. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1415-1420, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 2
·939-943
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IF 1.395
Lin Wang,Guangyou Zhang,Meishan Pei,Linlin Hu,Enyong Li,Huizhi Li
A lable-free, simple, and sensitive fluorescence “turn-on” approach is designed to rapidly detect protein using a conjugated polythiophene derivative (PDPMT-Cl). The fluorescence of PDPMT-Cl solution can be efficiently quenched by PtCl42− ions. Upon adding trypsin to the (bovine serum albumin, BSA) PDPMT-Cl–PtCl42− solution, the BSA is cleaved into amino acid or peptide fragments, which are stronger PtCl42− ions chelators to form more stable complexes with PtCl42− ions. Thus, the PtCl42− ion is displaced from PDPMT-Cl and the fluorescence of PDPMT-Cl is recovered. By triggering the “turn-on” signal of PDPMT-Cl, it is successful to detect the protein in real time. “Turn-on” response as readout signal is able to effectively reduce background noise and increase detection sensitivity. This method offers good selectivity for detecting protein in the presence of other common amino acids and metal ions. Under optimized conditions, the concentration of BSA in the range of 0.0004–1.75 mg/mL exhibits a linear relationship with the relative fluorescence intensity, and the correlation coefficient is 0.9997. The limit of detection is 4.47 × 10−4 mg/mL. The system is successfully applied for detecting protein in milk and egg. Due to the simplicity, sensitivity, and rapid response, this assay shows great potential for protein detection in the future. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 939-943, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 2
·869-876
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IF 1.395
Xiao-Jing Li,Shi-An Zhong,Cui-E Li
An azobenzene-containing molecularly imprinting polymer microsphere with photoresponsive binding properties toward 2,4-dichlorophenoxyacetic acid (2,4-D) was successful prepared via silica surface polymerization. The number-average diameters of silica and imprinting polymer microsphere are 0.5 and 0.7 μm, respectively. The static adsorption, binding and selectivity experiments were performed to investigate the adsorption properties and recognition characteristics of the polymers for 2,4-D. The equilibrium adsorptive experiments indicated that 2,4-D-SMIP(surface molecularly imprinted polymers) has significantly higher adsorption capacity for 2,4-D than its nonimprinted polymers (SNIP).The binding constant K d and apparent maximum number Q max of the imprinted polymer were determined by Scatchard analysis as 0.054 mmol L −1 and 0.167 mmol g −1 , respectively. The result of photoregulated release and uptake of 2,4-D experiment demonstrated that azo-containing SMIP can make use of light and change it into mechanical properties to release and take up the template molecules. It means that the SMIP can be controlled by light. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 869-876, 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 1
·631-637
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IF 1.395
Hongtao Liu,Jiangang Zhou,Xiuying Liu,Danying Zuo,Shaojin Gu,Weilin Xu
Biomedical polyurethane (BPU) and silk fibroin have similarly molecular architecture in their primary and aggregate structure, both of which have amide bonds and microphase separation, and they have been employed as scaffold materials for biomedical applications. Based on this, as the featured peptide sequence of silkworm silk fibroin, GlycineAlanineGlycineAlanine (GlyAlaGlyAla) tetrapeptide was synthesized by using traditional liquid-phase peptide synthesis method with Boc-protected glycine and alanine as starting materials, and was transformed to its derivative with two amine-terminated functional groups. The derivative was introduced as a chain extender into the backbone to form the hard segment of a silk-inspired PU with urea-linkage. Related measurements show that molecular weight of the synthesized silk-inspired PU ranged from 13,000 to 15,000. Fourier transform infrared (FTIR) absorption bands of Amides I and II are at 1651 cm −1 and 1534 cm −1 , and Raman absorption band of Amide III is at 1302 cm −1 . UV-Vis absorption peak of the silk-inspired PU is at 266 nm. This new concept and strategy may allow the fabrication of a new class of thermoplastic polyurethane elastomers to mimic the structure and properties of silk fibroin of silkworms and spiders. Information provided by this study may be used to better understand the correlation between the natural and man-made materials. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 21
·
IF 1.64
Renchang Zeng,Jiang Cheng,Shouping Xu,Qin Liu,Xiufang Wen,Pihui Pi
Reversible addition–fragmentation chain-transfer polymerization was introduced to prepare a series of zwitterionic poly(hydroxyethyl methacrylate)- g -poly(sulfobetaine methacrylate) (PSBMA) hydrogels (HSGs) with different monomer feed ratios. Compared with PSBMA hydrogels, these hydrogels exhibited enhanced mechanical strengths. Then, the HSGs were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and swelling measurements. We found that the equilibrium swelling ratios, mechanical strengths, and drug-release behaviors were significantly affected by the feed ratios of the gels. The hydrophilic tetracycline hydrochloride release results suggest that the hydrophilic drug release from the HSGs could be prolonged by the variation of the hydroxyethyl methacrylate amount in the gel networks. The bovine serum albumin adsorption data showed that the zwitterionic HSG with 18.2 wt % sulfobetaine methacrylate exhibited good protein-resistance properties. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41041.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 23
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IF 1.64
Xia Li,Yiming Cao,Guodong Kang,Haijun Yu,Xingming Jie,Quan Yuan
A simple two-step surface modification method of polyamide nanofiltration membrane, involving the activation of amide groups by formaldehyde and the subsequent cerium [Ce (IV)]-induced graft polymerization of zwitterionic 3-(methacryloylamino) propyl-dimethyl-(3-sulfopropyl) ammonium hydroxide) (MPDSAH) monomers, was employed to improve membrane antifouling property. The membranes before and after modification were characterized by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy, and atomic force microscopy. The changes in both surface chemical composition and morphology of membranes confirmed the successful graft polymerizations of MPDSAH onto polyamide nanofiltration membrane. The static water contact angle measurements showed that surface hydrophilicity of the modified membranes was significantly enhanced. As the MPDSAH concentration increased, the water flux of grafted membrane decreased gradually, while salt rejection increased slightly. The fouling experiments with bovine serum albumin solution demonstrated that modified membranes exhibited better resistance to protein fouling. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41144.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 23
·
IF 1.64
Nenmei Jian,Tao Xu
In this article, we report that thermoresponsive poly( N -isopropyl acrylamide) (PNIPAAm) was successfully grafted onto a cotton fabric (CF) surface by free-radical solution grafting polymerization; we obtained a thermoresponsive CF-grafted PNIPAAm. This reaction system only contained four constituents: the monomer, solvent, initiator, and CFs. Ammonium peroxydisulfate was chosen as the initiator, and water was chosen as the solvent. A series of initiator concentrations and grafting polymerization temperatures were used in the experiments, and their effects on the grafting ratio ( G ) were also studied. Also, the effects of the G of CF- g -PNIPAAm on their corresponding thermoresponses was studied further. The structure of CF- g -PNIPAAm was characterized by Fourier transform infrared spectroscopy–attenuated total reflectance analysis and scanning electron microscopy analysis. The G of CF- g -PNIPAAm was measured by a gravimetric method. The thermoresponse of CF- g -PNIPAAm was characterized by modulated differential scanning calorimetry, water contact angle measurements, and wetting time measurements. The experiments manifested the following results: (1) the initiator concentration and grafting polymerization temperature both influenced G, (2) the grafted PNIPAAm covered the CF surface, (3) the CF- g -PNIPAAm showed thermoresponsive hydrophilicity/hydrophobicity, and (4) a relationship existed between the thermoresponse of CF- g -PNIPAAm and the corresponding G . © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41193.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 1
·
IF 1.64
Zhu Xiong,Xinyan Dai,Haining Na,Zhaobin Tang,Ruoyu Zhang,Jin Zhu
In this manuscript, a toughened PLA/nanosilica composite with good storage stability was obtained in the presence of the epoxidized soybean oil (ESO). The composite was fabricated via a twin-screw extruder, and characterized by the FTIR, selective distribution test, and SEM. The surface of nanosilica was modified by the ESO through the chemical bonding, and this rendered the nanosilica to selectively localize in ESO droplets in the composite. As a result, the PLA/nanosilica composite was changed from brittleness to ductility with the addition of ESO. For example, the elongation and notched impact strength of the PLA/silica/ESO nanocomposite with 5 wt % nanosilica and 15 wt % ESO were ∼42% and ∼11 KJ/m 2 , respectively, which were much higher than neat PLA or PLA/nanosilica composite without ESO. Furthermore, the change of the brittle fracture of PLA into ductile fracture was investigated by SEM micrographs in detail. A possible toughening mechanism was also proposed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41220.
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高影响因子
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