JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 35
·46641
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IF 1.901
Xuelin Huang,Jing Guo,Yunming Yang,Shenglin Li,Shuang Chen,Yuanfa Liu,Sen Zhang
We synthesized a series of poly(acrylonitrile- co -allyl glycidyl ether)- graft -methoxypoly(ethylene glycol) (PAA- g -MPEG) copolymers as novel polymeric solid–solid phase-change materials by grafting methoxypoly(ethylene glycol) (MPEG) to the main chain of poly(acrylonitrile- co -allyl glycidyl ether) (PAA). PAA was the skeleton, and MPEG was a functional side chain, which stored and released heat during its phase-transition process. Fourier transform infrared spectroscopy and 1 H-NMR spectroscopy analysis were performed to investigate the chemical structures. The crystalline morphology and crystal structures were also measured with polarized optical microscopy and X-ray diffraction. Moreover, the thermal-energy-storage properties, thermal stability, and thermal reliability of the PAA- g -MPEG copolymers were characterized by differential scanning calorimetry and thermogravimetric analysis (TGA) methods. These analysis results indicate that the MPEG chains were successfully grafted onto PAA, and we found that the PAA- g -MPEG copolymers had typical solid–solid phase-transition temperatures in the range 11–54 °C and high latent heat enthalpies between 44 and 85 J/g. In addition, the as-prepared PAA- g -MPEG copolymers showed reusability and thermal reliability, as shown by the thermal cycle testing and TGA curves. Therefore, the synthesized PAA- g -MPEG copolymers have considerable potential for thermal energy storage. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46641.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 34
·46626
·
IF 1.901
Zhenglong Yang,Sai Chen,Kangyu Fu,Xinyan Liu,Feng Li,Yuchuan Du,Peiting Zhou,Zhihao Cheng
The self-assembly behavior of amphiphilic block copolymers in selective solutions has many applications in environmentally responsive polymer materials. In this article, we report on a new amphiphilic, temperature and pH dual-responsive poly[2-dimethylaminoethyl methacrylate- co -(methyl methacrylate)]- b -poly[poly(ethylene glycol) methacrylate] [P(DMAEMA- co -MMA)- b -PPEGMA], which was synthesized via reversible addition–fragmentation chain-transfer polymerization. The structure, self-assembly behaviors, and process of organic dye adsorption were characterized by 1 H-NMR, ultraviolet–visible absorbance spectroscopy, and DLS measurements. P(DMAEMA- co -MMA)- b -PPEGMA was proven to be an outstanding adsorbent with excellent reversibility. Methyl red was released from the micelles as the pH value of the solution was adjusted to 4, and it could also be encapsulated again when the pH value was adjusted to 7.4 because of the sensitive pH-responsive ability. It is promising that the triblock polymer had a positive effect on dye adsorption for environmental protection. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46626.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 9
·47122
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IF 1.901
Lingtong Li,Chun Yan,Haibing Xu,Dong Liu,Pengcheng Shi,Yingdan Zhu,Gang Chen,Xiaofei Wu,Wenqing Liu
We successfully prepared a graphene-modified carbon fiber (CF) sizing agent with good dispersity and stability by dispersing reduced graphene oxide (RGO) into an emulsion-type sizing agent. RGO was obtained by the reduction of graphene oxide (GO) with the help of gallic acid. The influence of the graphene-modified sizing agent on the interfacial properties of the CF–epoxy resin composites was investigated with microbond testing and the three-point bending method. The results show that optimized interfacial properties were achieved when the size of the modified graphene was less than 1 μm, the content of RGO was 20 ppm, and the pH value of the sizing agent was 10.5. The interfacial shear strength of the composites reached 92.3 MPa, which was 29.6% higher than that of the composites with unmodified CFs. Compared with commercial-CF-fabric-reinforced composites, the interlaminar shear strength of the composites treated with the RGO-modified sizing agent increased by 21.5%. Both the interfacial and interlaminar failure morphologies of the composites were examined with scanning electron microscopy (SEM). The results show that a large amount of residual resin adhered to the surfaces of the CFs treated with the RGO-modified sizing agent; this indicated good interfacial properties between the CFs and the resin matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47122.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 10
·47170
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IF 1.901
Hui Zhang,Hao Yang,Baoqing Shentu
Surface modification of titanium dioxide (TiO 2 ) nanoparticles (NPs) by silane coupling agents and the ultraviolet-C (UV-C) aging behavior of silicone rubber (SiR) incorporated with the modified TiO 2 NPs were investigated in this work. The SiR samples incorporated with TiO 2 NPs displayed excellent stability against the UV-C radiation. In order to improve the dispersion of TiO 2 NPs in the SiR matrix, the surface of TiO 2 NPs was modified with 3-aminopropyl triethoxysilane and 3-trimethoxysilyl propyl methacrylate, respectively. The surface modification of TiO 2 NPs was characterized by thermal gravimetric analysis and Fourier transform infrared spectroscopy. The dispersion stability of the pristine TiO 2 NPs and surface silane-modified TiO 2 NPs was evaluated in an organic solvent (toluene). Effect of surface modified TiO 2 NPs on the UV-C aging behavior of SiR was evaluated in terms of the change of surface morphology, tensile properties, hardness, crosslinking density, and surface microstructure before and after the UV-C aging. The results showed that surface modification of TiO 2 NPs with silane coupling agents could improve the dispersion of TiO 2 NPs in the SiR matrix. Moreover, the SiR with modified TiO 2 NPs showed an improved aging resistance to the UV-C radiation, compared with the samples with pristine TiO 2 NPs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47170.
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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
·
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. 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
·
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 35
·46675
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IF 1.901
Yeqing Dong,Xiaoyan Ma,Haohui Huo,Qilu Zhang,Fengjin Qu,Fang Chen
A novel series of quadruple responsive copolymers, poly(ethylene glycol)- ss -[poly(dimethylaminoethyl methacrylate)- co -poly(2-nitrobenzyl methacrylate)] [PEG- ss -(PDMAEMA- co -PNBM)], were synthesized via atom transfer radical polymerization mediated by home-made PEG-based macro-initiator labeled with disulfides. The obtained copolymers could self-assemble in aqueous solution forming micelles with the disulfide bridge linking the hydrophilic coronas (PEG) and the hydrophobic cores (PDMAEMA- co -PNBM). Investigation on the resulted micelles indicated that the micelles could respond to various stimuli, that is, temperature, pH, the presence of dithiothreitol (DTT), and UV irradiation. Moreover, the responsive behavior of the micelles depends on the type of stimuli, that is, temperature change causes size change of the micelles, while UV irradiation leads to dissolution of the self-assembled structures. Such stimulus-dependent responsive behavior could be applied in smart materials that deal with multi-tasks or in the construction of complex logic gate. The potential application of the multi-responsive micelles in cargo release system was also evaluated using Nile Red (NR) as model molecule. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46675.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 1
·46906
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IF 1.901
Jinhui Liu,Jieting Geng,Kai Liu,Lingli Zou,Zhaobo Wang,Jing Hua
Molybdenum-based random 1,2-polybutadiene (1,2-PB) rubber, with its excellent wet skid resistance, low rolling resistance, and low heat buildup, can be used for green tread rubber, and it has significant benefits for the enhancement of the mechanical strength of 1,2-PB. In this study, we investigated in detail the effects of the electronegativity and steric hindrance of the cocatalyst on the stereoselectivity of the resulting polymers. In the case of cocatalysts with moderate electronegativities, the active centers were more stable; this resulted in a larger molecular weight and a higher conversion, whereas a cocatalyst with excessive electronegativity tended to initiate cationic polymerization. The high sterically hindered substituent restricted the coordination configuration of the monomer; this ultimately resulted in the increase in the 1,2 structure to 90%. Fourier transform infrared analysis showed that the content of trans -1,4 structure increased from 7 to 66%, and its crystallinity reached 59.2%, as calculated with differential scanning calorimetry when triethyl aluminum was used as the cocatalyst. Consequently, trans -1,4-polybutadiene crystals were introduced into the 1,2-PB elastomer in one step; this could be a promising facile route for strengthening 1,2-PB. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46906.
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高影响因子
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