JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 2
·46930
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IF 1.901
Shichao Li,Hongyu Wang,Minjing Liu,Cong Peng,Zhanjun Wu
The poor cryogenic mechanical properties of epoxy resins restrict their extensive application in cryogenic engineering fields. In this study, a newly synthesized epoxy-functionalized polysiloxane (PSE) is used to improve the cryogenic mechanical properties of bisphenol-F epoxy resin. The Fourier transform infrared spectra and nuclear magnetic resonance confirm the formation of epoxy-functionalized –Si–O–Si– molecular chain. The surface free energy test results show that the PSE has a better compatibility with epoxy resin. The mechanical test results show that the cryogenic tensile strength, failure strain, fracture toughness, and impact strength of epoxy resin is improved significantly by adding the suitable amounts of PSE. Compared to the neat epoxy resin, the maximum tensile strength (196.92 MPa, an improvement of 11.2%), failure strain (2.97%, an improvement of 33.8%), fracture toughness (3.05 MPa·m 1/2 , an improvement of 30.7%) and impact strength (40.55 kJ m −2 , an improvement of 14.8%) at cryogenic temperature (90 K) is obtained by incorporating 10 wt % PSE into the neat epoxy resin. Moreover, the results also indicated that the tensile strength, Young's modulus, and fracture toughness of epoxy resin with the same PSE content at 90 K are higher than that at room temperature (RT). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46930.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 11
·47180
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IF 1.901
Mengwei Jiang,Yunshu Zhang,Yuan Yu,Qingwu Zhang,Bujun Huang,Zhiquan Chen,Tingting Chen,Juncheng Jiang
Ammonium polyphosphate (APP) was modified using a new method, where the resulting modified APP (MAPP) was obtained by mixing APP with unsaturated polyester resin (UPR). MAPP was more effective in improving the flame retardancy of UPR than APP which was due to the improved dispersion of MAPP in UPR composite. Then, the UPR composites were prepared based on dimethyl methylphosphonate, MAPP, montmorillonite, and zinc borate. Finally, the flame-retardant and mechanical properties of the UPR composites were analyzed using the limited oxygen index (LOI), thermogravimetric analysis, UL-94 vertical burning test, scanning electron microscopy, cone calorimetry, mechanical tests, and viscosity measurements. The LOI and UL-94 tests showed that the flame-retardant properties clearly improved with the addition of fillers in the UPR composites compared to pristine UPR. The synergistic effect of Si- and P-containing flame retardants in this composite resulted in the LOI value increasing from 18.9 to 31.3% and achieved the UL-94 V-0 rating. Moreover, the heat release rate was lower than the pristine UPR. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47180.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 8
·47086
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IF 1.901
Ruirui Hu,Enlai Gao,Zhiping Xu,Luqi Liu,Guorui Wang,Hongwei Zhu,Zhong Zhang
Two types of electrospun polyoxymethylene nanofibers with rough and smooth surface morphologies [rough fibers (RFs) and smooth fibers (SFs), respectively] were successfully prepared via the control of the electrospinning voltages. Mechanical tensile tests showed that the RF nonwoven mats exhibited a much higher elongation (440%) than the SFs (180%) without sacrifices in the stiffness and strength. Scanning electron microscopy characterization revealed that the large ductility of a single RF resulted from its unique multiple-necking mode, which was induced by its rippled structural features. In the meantime, the large ductility led to a high molecular orientation under tension and further improved the strength and toughness of the RF nonwoven mats. In comparison, the SF behaved in a single-necking deformation mode, and this led to a rapid rupture behavior. This surface-morphology-dependent mechanical behavior helped us to deeply understand the relationship between the structure and properties and should guide the development of high-performance materials for load-bearing applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47086.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 38
·46737
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IF 1.901
Xiangze Cheng,Huaiyang Jin,Chunhui Shen,Shanjun Gao,Jiang Wang,Xi Zhu
A polyphosphoric acid functionalized proton exchange membrane (PEM) was prepared by a ring opening reaction using the epoxycyclohexylethyltrimethoxysilane (EHTMS) and amino trimethylene phosphonic acid (ATMP) as raw materials and was modified by poly(vinylidene fluoride)–hexafluoro propylene (PVDF-HFP). The structure of the membranes was characterized by Fourier transform infrared and scanning electron microscopy. The X-ray photoelectron spectroscopy explores the content of the elements in the membrane related to the ion exchange capacity value. The membranes’ properties including water uptake, swelling ratio, proton conductivity, and hydrolysis stability were studied. Performance tests show that when ATMP/EHTMS = 1/5, conductivity of the PVDF-HFP modified PEMs increased from 0.83 × 10 −4 S cm −1 at 20 °C to 9.53 × 10 −3 S cm −1 at 160 °C, the swelling ratio of membranes decreased from 2.71% to 2.13%. The results indicate that the introduction of F atoms is beneficial to increase the proton conductivity and the dimensional stability. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46737.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 48
·46892
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IF 1.901
H.L. Guan,D.L. Yong,M.X. Fan,X.L. Yu,Z. Wang,J.J. Liu,J.B. Li
The superabsorbent resin (SAR) containing sodium humate (SH) has been synthesized by free-radical graft copolymerization with acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid, and SH as monomers in aqueous solution, using N,N ′-methylenebisacrylamide as crosslinking reagent and potassium persulfate as initiator. The structure and morphology of the as-prepared SARs were fully characterized by Fourier transform infrared , scanning electron microscopy and thermogravimetric analysis, respectively. Meanwhile, the effects of crosslinking reagent, initiator, SH, and neutralization degree on the water absorbency of SAR were studied. The results showed that the adding of SH in the SAR enhanced the salt-tolerating and moisture-resisting capacities obviously. The SAR without SH [poly(acrylic acid) (PAA)/2-acrylamido-2-methyl-1-propanesulfonic (AMPS)] showed a maximum water absorbency of 600 g g −1 in distilled water and 60 g g −1 in 0.9 wt % NaCl solution, while SAR modified by SH (PAA/AMPS/SH) exhibited the maximum water absorbency of 1380 g g −1 in distilled water and 117 g g −1 in 0.9 wt % NaCl solution. Furthermore, the moisture-resisting capacity of PAA/AMPS/SH decreases to 8 wt % compared with PAA/AMPS. PAA/AMPS/SH also has better water absorbency in different cation solutions. The results indicated that the introduction of SH could enhance the performance of SAR obviously. The possible reasons with this enhancement were also investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46892.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 45
·46716
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IF 1.901
Hongwei Zhao,Bing Liao,Kun Wang,Yangyang Zhao,Fuwei Nian,Yeyun Meng,Hao Pang
In this work, a novel crosslinked topological polycarboxylate superplasticizer (TPC) was successfully synthesized. In comparison with conventional comb-shaped superplasticizer (CPC), the TPC performed better dispersion maintaining stronger water reduction capabilities. The TPC provided a large spherical space due to its crosslinked molecular structure, which was the main reason for enhanced dispersion performance. It was evident that the addition of TPC leads to a delayed and lowered heat flow peak during the early stage of the hydration process. Thermogravimetric analysis showed that the hydrated products exhibited a more stable performance in the presence of the TPC. Changing the molecular structure from a comb-shape to a crosslinked topological could effectively improve the comprehensive performances of the PCs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46716.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 46
·46824
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IF 1.901
Yuyu Liu,Lingli Deng,Cen Zhang,Kailun Chen,Fengqin Feng,Hui Zhang
In this study, we fabricated ethyl cellulose (EC)–gelatin (G) composite films by solvent casting and electrospinning. The characterization of the cast and electrospun films was performed by scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry, and water contact angle measurements. The results showed that the blending of EC with G improved the spinnability of the composite films with higher thermal stability. Compared with solvent casting, electrospinning induced a helix-to-coil transition of G and provided more hydrogen-forming sites for EC to form a compatible network. Interestingly, the electrospun composite film had a hydrophobic surface with a water contact angle of 113.8°, whereas the cast composite film showed a hydrophilic surface at 67.5°. The confocal laser scanning microscopy observations suggested that after water immersion, the cast composite film collapsed into aggregates, whereas the electrospun composite film maintained the nanofibrous structures well; this indicated an improved water resistance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46824.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 46
·46759
·
IF 1.901
Mingmin Jia,Yi Feng,Jianhao Qiu,Xiaocheng Lin,Jianfeng Yao
UiO-66-NH 2 nanocrystals were synthesized and embedded into bromomethylated poly(phenylene oxide)/polyethersulfone (BPPO/PES) polymer matrix to form UiO-66-NH 2 /BPPO/PES mixed matrix membranes (MMMs). The crystalline structure, interaction between UiO-66-NH 2 and BPPO, and dispersion of UiO-66-NH 2 were characterized by FTIR, XRD, and SEM. Nanoparticle dispersion was drastically enhanced with the assistance of BPPO, giving an improved adhesion between the polymer and filler particles. Owing to the intrinsic adsorption property of UiO-66-NH 2 and BPPO to CO 2 , the CO 2 permeability was significantly increased. As a result, the UiO-66-NH 2 /BPPO/PES membrane exhibited enhanced gas separation performance, where CO 2 /N 2 and H 2 /N 2 ideal selectivities were increased to 50.2 and 302.4 with a CO 2 permeability of 125.6 Barrer. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46759.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 40
·e46834
·
IF 1.901
Jiguang Liu,Gaoli Shi,Yue Liu,Siyan Chen,Cong Shang
A novel method is presented for the construction of a hierarchical microstructure/nanostructure via the chemical self-assembly of poly( N -isopropyl acrylamide- co -acrylic acid) particles on polyester fibers. The textile of the particle-bound fibers possessed smart wettability and an oil-absorbing capacity. The wettability was dependent on the initial contact angle and spreading time of water droplets on the particle-bound textile, which could be controlled with the content of acrylic acid inserted into the polymer chains. The wettability of the particle-bound textile was responsive to the pH value. In addition, the textile was superoleophilic on an air–solid surface and could absorb oil quickly from water. The oil-absorbing capacity could be controlled by the alteration of the pH value. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46834.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 8
·47091
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IF 1.901
Sha He,Weiqu Liu,Maiping Yang,Chunhua Liu,Chi Jiang,Zhengfang Wang
Fluorinated polyacrylates containing amino side chains (FACAs) were synthesized to improve the water repellency of waterborne epoxy resin. First, FACA was prepared by a two-step process. Then, a phase-inversion emulsion technique, taking FACA as the reactive surface additives, was employed to prepare waterborne epoxy resin. The effect of the fluorinated content and the length of the fluorine side chain on the surface, thermal, and bulk properties of the waterborne epoxy resin were investigated. It was observed that moderate increase of the fluorinated content or the length of the fluorine side chain improved the contact angle and thermal properties while the mechanical property was not deteriorated. A small amount of fluoride (0.07 wt %) in the EA-F1/3-1 sample can dramatically increase the water contact angle from 72.63° to 95.31° due to the strong tendency of the macromonomers to migrate toward the outmost layer, resulting in enrichment of fluorine atoms on the surface. X-ray photoelectron spectroscopy results revealed that for a given weight of the two macromonomers, F atomic concentration of the copolymer modified by longer fluorinated side chains was higher than that modified by short fluorinated side chains. From the present investigation, FACA successfully improved the surface property of waterborne epoxy resin and showed a prominent potential application in large-scale industrialization. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47091.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 8
·47098
·
IF 1.901
Zhuo Li,Jijun Wan,Yingzhe Li,Yang Li,Fei Zhao,Shugao Zhao
The effects of various coupling agents on the characteristics and properties of a natural rubber (NR)/styrene–butadiene rubber (SBR) matrix and its adhesion to continuous basalt fiber (CBF) cords were studied. Four types of silane-based and two types of titanate-based coupling agents were added separately to the rubber matrix during the mixing process. The processability of the rubber compounds and the mechanical and tension fatigue properties of the vulcanizates were evaluated. The static and dynamic adhesion between the CBF cord/rubber matrices were investigated using the H pull-out test and an elastomer testing system, respectively. The results showed that the effects of the coupling agent were controlled by its chemical structure, and it was found that the addition of (3-aminopropyl)triethoxysilane was the most effective for enhancing the interfacial fatigue properties, due to the combined improvements of the initial adhesion, interfacial stress states, and the fatigue property of the rubber matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47098.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46583
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IF 1.901
Ying Pan,Hongting Zhao
Sulfonated melamine-formaldehyde (SMF) resin was successfully synthesized with a mixture of formaldehyde, melamine, and NaHSO 3 in an aqueous solution. Then the SMF was used as the blowing agent to combine with chitosan and phytic acid for fabricating the intumescent flame retardant coating on the surface of the cotton fabric by layer-by-layer (LbL) self-assembled technology. As characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, and attenuated total reflection Fourier transform infrared spectroscopy, the (chitosan/SMF + phytic acid) n coating was successfully deposited on the surfaces of cotton fibers. Thermogravimetric analysis results exhibited that the thermal stabilities of coated cotton fabrics under nitrogen and air atmosphere were enhanced at temperatures ranging from 400 to 700 °C compared with pure cotton fabric. At 700 °C, the char residues of cotton-5BL and cotton-10BL under a nitrogen atmosphere were improved 25.9 and 32 wt % than that of pure cotton fabric, respectively. In the vertical flame test, the self-extinguishing could be obtained for the cotton-10BL sample. This work first utilized SMF as negative polyelectrolyte to fabricate intumescent flame retardant coating by LbL self-assembled technology on cotton fabric to strengthen its thermal stability and flame resistance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46583.
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高影响因子
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