JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 36
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IF 1.768
Ming He,Jianjun Zhou,Huan Zhang,Zhenyang Luo,Jianfeng Yao
Microcrystalline cellulose (MCC) and its oxidized product dialdehyde cellulose (DAC) were introduced as the reinforcing filler in epoxidized soybean oil (ESO) thermosetting polymer. The composites comprising up to 25 wt % cellulose fillers were obtained via a solution casting. The reinforcing effects of the cellulose were evaluated by microstructure analysis, dynamic mechanical analysis, and tensile and thermal stability tests. The results showed that at the same filler concentration, DAC led to higher stretching strength, modulus, and break elongation than MCC. The 5 wt % DAC loading in ESO polymer exhibits the highest toughness and thermal stability due to the good dispersion and interfacial interaction between DAC and ESO polymer matrix. The increased storage modulus and glass transition temperature also indicate the cellulose fillers impart stiffness to the composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42488.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 22
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IF 1.768
Yong Liu,Jieyi Liang,Shoulian Wei,Ling Liu,Miaochan Liao
The purpose of this study was to fabricate and evaluate nanoparticles based on β-conglycinin (7S) and chitosan (CS) to deliver 5-fluorouracil (5-FU). The nanoparticles were prepared with a self-assembly method. Turbidity measurements performed at 600 nm were used to investigate the formation of the nanoparticles as a function of the pH, 7S-to-CS mass ratio, and total concentration of 7S and CS. The optimum conditions for the preparation of the nanoparticles were a pH of 5.5, a 7S-to-CS mass ratio of 4 : 1, and total concentration of 7S and CS of 9 mg/mL. Under these conditions, the nanoparticles in solution had a high turbidity and good stability. Fourier transform infrared spectroscopy revealed that the nanoparticles were formed mainly through electrostatic interactions between the amine groups ( NH 3 + ) of CS and the carboxyl groups ( COO − ) of 7S. Scanning electron microscopy micrographs and dynamic light scattering analysis showed that the nanoparticles had an approximately spherical morphology with a smooth surface, and the mean particle size was about 120 nm with a narrow size distribution. The release of 5-FU showed an initial burst release followed by a sustained release, and the release was pH-dependent. The release mechanism of 5-FU was Fickian diffusion according to the Ritger–Peppas model. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41963.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 16
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IF 1.768
Heyi Ge,Xiaolong Ma,Huashi Liu
A modified resin was synthesized through the reaction between dodecylamine and tetraglycidyldiaminodiphenylmethane (TGDDM), which was used as the film former of sizing agent for carbon fiber (CF). The sizing agents were prepared through phase inversion emulsification method. Fourier transform infrared spectroscopy (FTIR) was utilized to analyze the modified resin. Particle sizes of the sizing agents were tested to evaluate their stabilities. Differential scanning calorimetry (DSC) results demonstrated that the glass transition temperature ( T g ) of the modified TGDDM is much higher than the T g of the cured epoxy resin E-44. The influences of the sizing treatment on CF were investigated by abrasion resistance, fluffs, and stiffness tests. The maximum abrasion resistance increased by 172.8%, compared with the abrasion resistance of the desized CF. Interlaminar shear strength (ILSS) results of the CF/TGDDM composites indicated that the interfacial adhesion between CF and matrix resin was greatly improved after CF was sized. The maximum ILSS value could obtain a 29.16% improvement, compared with the ILSS of the desized CF composite. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41882.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 47
·45544
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IF 1.86
Chengzhen Geng,Qian Zhang,Weihua Lei,Fengmei Yu,Ai Lu
Silica is the most widely-used filler to reinforce liquid silicone rubber (LSR), but the high viscosity of LSR/silica suspension significantly limits its processing flexibility. To balance the processibility and reinforcing efficiency of LSR/silica systems, two kinds of enols (propenol and 1-undecylenyl alcohol) and a saturated alcohol (1-undecylic alcohol) were employed to modify the silica surface. Various rheological tests were carried out to investigate the processibility as well as filler networking and crosslinking processes of the modified systems. Tensile tests were also adopted to verify the reinforcing effect. It was found that surface modification of silica by 1-undecylenyl alcohol could significantly reduce the viscosity of its suspension with LSR. Meanwhile, the mechanical strength of LSR could be largely enhanced by six times with 10 wt % modified silica. This work will merit design and production of LSR materials with balanced processibility and mechanical performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45544.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 36
·45268
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IF 1.86
Hongbin Li,Wenying Shi,Yuheng Su,Haixia Zhang,Xiaohong Qin
Polyamide thin-film composite nanofiltration (NF) membranes were prepared via the interfacial polymerization (IP) process of piperazine and 1,3,5-trimesoyl chloride on the polysulfone/nonwoven fabric ultrafiltration membrane surface. Carboxylated multiwalled carbon nanotubes (cMWNTs) were incorporated into the aqueous phase during the IP process to improve the membrane performance. The composition and morphology of the membrane surface were examined by means of attenuated total reflectance–Fourier transform infrared spectroscopy, scanning electron microscopy–energy dispersive spectrometry, and atomic force microscopy. The effects of the cMWNTs content on the membrane hydrophilicity, separation performance, and antifouling properties were characterized through water contact angle and crossflow filtration measurements. The experimental results show that membrane surface hydrophilicity, water permeability, salt rejection ( R ), and antifouling properties all improved. In particular, when the cMWNTs content was 50 ppm, the magnesium sulfate R of the composite NF membrane reached a maximum value of 98.5%; meanwhile, the membrane obtained an obviously enhanced water flux (62.1 L m −2 h −1 at 0.7 MPa), which was two times larger than that of the original NF membrane. The modified NF membranes showed enhanced antifouling properties; this was mainly attributed to changes in the microstructures and surface features of the polyamide layer after the addition of the cMWNTs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45268.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 25
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IF 1.86
Linlin Wang,Yuelong Liu,Gousheng Liu
Hydrophobic mica particles were prepared by piranha solution activation, silanization, and copolymerization with acrylate monomers. Its surface morphology, hydrophilic properties, and thermogravimetric analysis changed differently in comparison with those of pristine mica. Scanning electron microscopy (SEM) showed that the modified (001) mica surface changed from flat to coarse. Thermogravimetric curves demonstrated that silane coupling agents and the grafted polymer were anchored on the modified-mica surface. The alternating surface polarity state was verified by different dispersion performances in the solvents. SEM images showed that the polypropylene (PP)/modified-mica composites had a better quality compatibility than the PP/untreated-mica composites. The PP/polymer-grafted-mica composites had improved mechanical properties, including stretching, tension, and impact properties. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44985.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 38
·45327
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IF 1.86
Yi Yuan,Zhiming Yan,Ruo-Jun Mu,Lin Wang,Jingni Gong,Xin Hong,Maryam Hajia Haruna,Jie Pang
Konjac glucomannan (KGM) hydrogel has good potential application in food and medical science, although to achieve this, the physical and mechanical properties need further improvement. In this study, graphene oxide (GO) was used to improve the functionality of KGM hydrogel. KGM/GO hydrogels were prepared by freezing the alkaline KGM/GO sols. Rotational rheometer was used to study the rheological properties of different alkaline KGM/GO sols. Fourier transform infrared, Raman, differential scanning calorimetry, thermogravimetric analyses, and scanning electron microscopy were used to evaluate the structure and properties of the hydrogels. In addition, different pH solutions and an in vitro assay were used to study the swelling property and the release behavior of KGM/GO hydrogels, respectively. The result revealed strong hydrogen-bond interaction between KGM and GO. The incorporation of GO highly improved the gel properties of KGM/GO sol, higher thermal stability, and more compact structure of KGM/GO hydrogels. KGM/GO hydrogels showed better swelling properties in deionized-distilled water and pH 7.2 PBS. The release of 5-aminosalicylic acid (5-ASA) from KGM/GO (KG4) hydrogel was different in various pH media, but the initial burst release effect was very severe. Therefore, incorporation of GO have a good potential in enhancing the properties of KGM hydrogel, but KGM/GO hydrogel is not an ideal carrier for 5-ASA release. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45327.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 38
·45320
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IF 1.86
Long Mao,Yue-Jun Liu,Yong-Kang Bai,Hui-Qing Wu,Xiao-Chao Liu
The synthesis of multimetallic layered double hydroxides- g -poly(ɛ-caprolactone) (LDHs- g -PCL) was explored by in situ ring-opening polymerization, considering layered clay's improvement on barrier properties in polymer films. LDHs/PCL nanocomposites were prepared by blending LDHs- g -PCL and pure PCL via solution casting method. With incorporation of as low as 0.2 wt % of LDHs, LDHs/PCL nanocomposites exhibited excellent mechanical performance with tensile strength and elongation at break over 45 MPa and 837%, respectively. Compared with pure PCL, the O 2 permeability of LDHs/PCL nanocomposites decreased by nearly 78% as LDHs content increased up to 1 wt %. It was revealed that the key parameter to improve the barrier properties is not only the high aspect ratio of layered clays but also the specific interactions that they develop in the polymers matrix. Due to the merits of its biodegradation and physical properties, LDHs/PCL nanocomposites could be potential materials applied in packaging industry widely. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45320.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 35
·45251
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IF 1.86
Shan Wu,Lei Wang,Lixin Wu,Zixiang Weng,Yu Zhou
Although organically modified montmorillonite (OMMT) has been incorporated into unsaturated polyester (UP) resin to enhance properties, the aggregation often leads to defects which directly affect the properties of nanocomposites. In this work, OMMT slurry modified by a new allyl surfactant with carbon–carbon double bond, hexadecyl allyl dimethyl ammonium chloride (C 16 -DMAAC), was employed to prepare nanocomposites by in situ polymerization. The results illustrated that the existence of OMMT slurry helped monomers enter the OMMT galleries, leading to well-dispersed OMMT in the UP matrix. The mechanical properties and thermal properties of OMMT nanocomposites were improved. With OMMT loading of 5 wt %, the tensile strength and flexural strength can be improved by 22% and 38%, respectively. Meanwhile, the onset thermal decomposition temperature ( T –10 ) value was ameliorated from 310.6 °C to 330.6 °C. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45251.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 34
·45229
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IF 1.86
Chunyang Shang,Yanjun Chen,Chaocan Zhang,Zongyi Deng,Zhihui Wu
This article describes a new and simple method to control the release of payloads encapsulated in chitosan capsules. The capsules with the liquid core and rigid shell are performed by drop-wisely adding chitosan solution into anionic surfactant solution. The capsules can be destroyed by β-CD because β-CD binds and sequesters surfactant from the shell through the host-guest interaction. The destruction process is studied by optical microscopy and scanning electron microscopy. The capsules can swell in acid solution and shrink in alkaline solution. It is found that the destruction speed increases with increasing acidity or alkalinity of β-CD solution. Rhodamine B encapsulated in the liquid-core of chitosan capsules can be released from the capsules in β-CD solution. The release rate can be adjusted by the pH value of β-CD solution. The release speed of the capsule increases with the increase of acidity or alkalinity in β-CD solution. The above concept can provide more versatility for controlled release of a variety of payloads such as drugs, cosmetics, and so on. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45229.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 25
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IF 1.86
Yangben Cai,Zhouying Yue,Shiai Xu
A novel functional graphene with high ion exchange capacity (IEC) was prepared by grafting reaction induced by 60 Co γ-ray irradiation using graphene oxide. Then, polybenzimidazole/radiation grafting graphene oxide (PBI/RGO) composite membranes were prepared by the solution-casting method and doped with phosphoric acid (PA) to improve their proton conductivity. The properties of PBI/GO/PA and PBI/RGO/PA membranes including the PA doping level, chemical stability, proton conductivity and mechanical properties were evaluated and compared. The tensile strength of PBI/RGO/PA membranes (ranging from 27.3 to 38.5 MPa) increases at first and then decreases with the increase of the RGO content, and is significantly higher than that of other PA doped PBI-based membranes. The proton conductivity of PBI/RGO-3/PA membrane is 28.0 mS cm −1 at 170 °C without humidity, with an increase of 72.0% compared with that of PBI/PA membrane. These results suggest that PBI/RGO/PA membranes have the potential to be used as high-temperature proton exchange membranes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44986.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 24
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IF 1.86
Weiwang Chen,Wenguo Weng,Ming Fu
Fatty acid mixed esters (i.e., HPCMEs) with the onset phase change temperature around 32 °C were successfully synthesized by grafting palmitic-stearic binary acids (PA-SA) onto hydroxypropyl cellulose (HPC). The effects of reaction time, reaction temperature, initial ratio of reactants, and stirring speed on grafting ratio (GR) were explored. Characterizations by FTIR, 1 H NMR, DSC, and TGA were also performed to investigate their structure, thermal storage, and decomposition behavior. The results reveal that the prepared HPCMEs as thermoplastic copolymers exhibit high enthalpies, good repeatability, and enhanced thermal resistance properties. With the introduction of HPC rigid skeletons, gradual volatilization of fatty acids during use is well solved. The prepared HPCMEs thus are expected to have wide prospects for thermal energy storage owing to their proper phase change temperatures and excellent integrated performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44949.
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