JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 42
·45387
·
IF 1.86
Xiaofei Dang,Xinyu Cao,Linnan Ke,Yongmei Ma,Jingjing An,Fosong Wang
In this study, nanofiber cellulose (NFC) based on a 2,2,6,6-tetramethylpiperidine-1-oxyl radical oxidization method was successfully combined with chain-end-functionalized polyethylene containing alkoxysilane via silanization. Fourier transform infrared spectroscopy, transmission electron microscopy, contact angle measurements, Molau tests, and X-ray photoelectron spectroscopy analyses provided further evidence for the effectiveness of the surface modifications. The hydrophilic surface characteristics of NFC were changed to apparently hydrophobic for the modified nanofiber cellulose (M-NFC). Then, the linear low-density polyethylene (LLDPE)/M-NFC nanocomposite was prepared, and the mechanical properties, thermal properties, and crystallization properties of the LLDPE–M-NFC were investigated by tensile testing, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis. The results show that after modification, the thermal stability of NFC was enhanced. The interface between M-NFC and the matrix was good. The tensile strength and Young's modulus values of the nanocomposites were enhanced compared with those of LLDPE; in particular, the tensile strength and Young's modulus of the blend with 5 wt % M-NFC increased by 56 and 106%, respectively. The storage modulus of the nanocomposites was enhanced obviously over a wide temperature range. The addition of a small amount of M-NFC had slight effects on the crystallinity and melting temperature of LLDPE. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45387.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 6
·
IF 1.866
Ling Hu,Pingping Jiang,Gang Bian,Min Huang,Agus Haryono,Pingbo Zhang,Yanmin Bao,Jialiang Xia
A novel graphene nanomaterial functionalized by octa(aminopropyl) polyhedral oligomeric silsesquioxane (OapPOSS) was synthesized and then confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM EDX), atomic force microscopy, and X-ray diffraction. The obtained functionalized graphene (OapPOSS-GO) was used to reinforce waterborne polyurethane (WPU) to obtain OapPOSS-GO/WPU nanocomposites by in situ polymerization. The thermal, mechanical, and hydrophobic properties of nanocomposites as well as the dispersion behavior of OapPOSS-GO in the polymer were investigated by TGA, a tensile testing machine, water contact angle tests, and field emission SEM, respectively. Compared with GO/WPU and OapPOSS/WPU composites, the strong interfacial interaction between OapPOSS-GO and the WPU matrix facilitates a much better dispersion and load transfer from the WPU matrix to the OapPOSS-GO. It was found that the tensile strength of the OapPOSS-GO/WPU composite film with 0.20 wt % OapPOSS-GO exhibited a 2.5-fold increase in tensile strength, compared with neat WPU. Better thermal stability and hydrophobicity of nanocomposites were also achieved by the addition of OapPOSS-GO. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44440.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 23
·48781
·
IF 2.188
Bengang Li,Chao Wu,Chengyu Wang,Zhenyang Luo,Jianpeng Cao
Developing electrically conductive hydrogels with good electronic properties and excellent mechanical performance is significant to their potential applications. In this article, we present a strategy to fabricate tough, self-recoverable and electrically conductive hydrogels containing reduced graphene oxide (rGO). Poly(acrylic acid) grafted graphene oxide (GO-g-PAA) was synthesized and incorporated into chemically crosslinked polyacrylamide (PAM) networks to obtain GO-g-PAA/PAM hydrogels, which were further treated with ascorbic acid solution at ambient temperature to give rGO-g-PAA/PAM hydrogels. The interfacial interaction between GO/rGO and hydrogel matrix was improved by reversible hydrogen bonds between the grafted PAA chains and PAM matrix. Consequently, both GO-g-PAA/PAM and rGO-g-PAA/PAM hydrogels exhibited improved tensile properties, excellent energy dissipation, and rapid self-recovery. The in situ chemical reduction of GO-g-PAA in hydrogel matrix endowed rGO-g-PAA/PAM hydrogels with satisfactory electrical conductivity and obvious resistance change upon stretching. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48781.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 28
·
IF 1.768
Hang Xu,Haicun Yang,Liu Zhang,Qingting Ni,Fanghong Gong
The Core-shell hybrid particles with attapulgite (ATP) as the core and polymethylmethacrylate (PMMA) as the shell (ATP- g -PMMA) were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization method. The diameter of ATP- g -PMMA was increased to 50–60 nm, and the surface hygroscopicity was decreased observably after surface grafting. Then, ATP- g -PMMA hybrid particles were filled into the polycarbonate (PC) by melt mixing to afford nanocomposites, and the mechanical properties, microstructures, thermal stability, and rheological behavior of nanocomposites were investigated by varying ATP- g -PMMA concentration in the range 1, 3, 5, and 7 wt % in PC. Fourier Transform infrared spectroscopy (FTIR) suggested that there is no esterification reaction between particles and matrix. Slight changes in tensile strength, and noticeable decrease of elongation and impact strength were observed with the increase in ATP- g -PMMA particles loading. The morphology evaluated by field-emission scanning electron microscopy (FESEM) indicated that ATP- g -PMMA was dispersed with a diameter range of 80–100 nm, and phase separation was appeared with increasing ATP- g -PMMA loadings. Thermogravimetric analysis (TGA) results revealed the thermal stability of composites was strengthened. The disentanglement and interface slip induced by preferred orientation and directional arrangement of ATP- g -PMMA resulted in lower complex viscosity (η*) and higher loss factor (tan δ) compared with the pristine PC. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42262.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 8
·
IF 1.866
Rui Bao,Shilin Yan,Ying Qin,Man Lu
This study investigates the effect of the thiol-ene click reaction on thermal conductivity and shear strength of the epoxy composites reinforced by various silane-functionalized hybrids of sulfhydryl-grafted multi-walled carbon nanotubes (SH-MWCNTs) and vinyl-grafted MWCNTs (CC-MWCNTs). The results of Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermal gravimetric analysis (TGA), and transmission electron microscopy (TEM) show that the sulfhydryl groups and vinyl groups are successfully grafted onto the surface of MWCNTs, after treatment of MWCNT with triethoxyvinylsilane and 3-mercaptopropyltrimethoxysilane, respectively. Scanning electron microscopy (SEM), HotDisk thermal constant analyzer (HotDisk), optical microscope, and differential scanning calorimetry (DSC) are used to characterize the resultant composites. It is demonstrated that the hybrid of 75 wt % SH-MWCNTs and 25 wt % CC-MWCNTs has better dispersion and stability in epoxy matrix, and shows a stronger synergistic effect in improving the thermal conductivity of epoxy composite via the thiol-ene click reaction with 2,2′-azobis(2-methylpropionitrile) as thermal initiator. Furthermore, the tensile shear strength results of MWCNT/epoxy composites and the optical microscopy photographs of shear failure section indicate that the composite with the hybrid MWCNTs has higher shear strength than that with raw MWCNTs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44579.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 20
·52140
·
IF 3.057
Shoucun Zhang,Shengyan Wang,Yujing Bian,Min Xue,Shengwei Guo,Wenli Wu
Utilizing 2,2′-azobis(isobutyronitrile) (AIBN) as the initiator, the copolymerization of methyl methacrylate/methacrylate acid is performed by precipitation copolymerization. The effects of pressure, initiation concentration, the methacrylic acid (MA) concentration, and small amount of water are investigated separately. The morphology and molecular weight are analyzed by scanning electron microscopy and gel permeation chromatography, respectively. The results indicates that the concentration of MA or AIBN affects the molecular weight greatly, and the maximum molecular weight reaches 213 kDa. The morphology of samples exhibits a certain degree of agglomeration. Most samples are obtained as free-flowing powder with numerous spherical bulges under a proper polymerization condition.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 4
·
IF 1.395
Ruihua Huang,Bingchao Yang,Qian Liu,Yanping Liu
Activated carbon/chitosan composite has been used as an adsorbent to remove aniline and Cr(VI) ions from aqueous solutions simultaneously. The effects of preparation conditions such as the ratio of activated carbon to chitosan, crosslinking reagents, crosslinking time, and adsorption conditions including adsorbent dosage, pH value of solution, and contact time on simultaneous adsorption of aniline and Cr(VI) ion were investigated. Experimental results showed that epichlorohydrin was the proper crosslinking reagent, and the ratio of activated carbon to chitosan was kept at 1. When the adsorbent dosage was 4.0 g/L, and the concentrations of aniline and Cr(VI) were lower than 50 and 100 mg/L, respectively, both aniline and Cr(VI) were simultaneously removed at natural pH with high removals (>95%). The presence of Cr(VI) enhanced the adsorption of aniline, while the presence of aniline almost had no influence on the adsorption of Cr(VI). The adsorption processes of both aniline and Cr(VI) followed the pseudo-second-order kinetics model, but the sorption of Cr(VI) was preferential to that of aniline by this composite. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39903.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 4
·49745
·
IF 2.52
Pengfei Jie,Jiarui Du,Wei Tan,Jiyu Tang,Feng Zhang,Fengyu Qu
The cross-linking degree (crystallinity) and proton sources of conductors strongly impacts proton-conducting properties, but the attention is still limited, especially for covalent-organic frameworks. Here, we prepared a couple of cross-linking degrees of Schiff-Based Network by solvothermal (high surface specific area, SNW-S) and microwave-assisted (low cross-linking structure, SNW-M) strategies, respectively; subsequently, Brønsted acids (BAs)-entrapped Schiff-Based Network (SNW) composites as fillers are blended into polyvinyl pyrrolidone/poly(vinylidene fluoride) (PP) blends to form hybrid membranes. Varied crystalline degrees and microstructures of the SNWs are monitored by XRD, FTIR, and nitrogen adsorption, coupled with relevant conduction measurements like water uptake and proton conductivity (PC) for the composites and hybrid membranes. Structurally, under the aid of “acid–base pairs” between amine groups in Schiff-Based Network and Brønsted acids as proton carriers, the resulting H 2 SO 4 -incorporated SNW-M with poor cross-linking displays the high proton conductivity (4.96 × 10 −3 S/cm) with an activation energy of 0.13 eV, whereas H 2 SO 4 and H 3 PO 4 -incorporated SNW-S appear the relatively lower conductivities, imputable to the differences in the cross-linking degree of Schiff-Based Network and interactions between proton carriers and active sites in Schiff-Based Network. Additionally, the hybrid membranes also show σ values in the identical level of the composites, reaching to 8.02 × 10 −3 S/cm at 323 K.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 27
·50650
·
IF 3.125
Yongliang Guo,Yanping Zheng,Haojun Zhang,Jinfeng Cui,Junhong Guo,Baoping Yang
The polystyrene (PS) composite containing self-expanded intumescent flame retardant (polyphosphate ammonium and expandable graphite) was blended with three butyltriphenylphosphine-based chelate borates, respectively, to evaluate their effect on flame retardancy. The chemical structure of as-prepared three chelate borates was confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared spectrum (FTIR). The flame retardancy of various PS composites was evaluated by vertical burning test (UL-94), limited oxygen index (LOI), and cone calorimeter (CC). Flammability and combustion results suggested that one of chelate borates, named [BTP][BMB], made PS composite (PS4) obtain V-0 rating, 27.0 ± 0.3% LOI value, and reduction on heat release and smoke production with 17 wt% total flame retardants loading. The combustion residue was analyzed by scanning electron microscope and FTIR, and the pyrolysis gaseous products were investigated by TG-FTIR technique. Besides, complex viscosity of PS composites composed of various chelate borates from a rheology instrument indicated that the improvements of flame retardancy of PS composites depended on the temperature of construction of crosslinked network by expandable graphite, which the chelate borates showed distinctive influence. Accordingly, the flame-retarding mechanism about fast response to flame has been proposed.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 16
·51987
·
IF 3.125
Pan Xu,Yi Zong,Zhijie Shang,Meiling Yao,Pingde Liu,Xinxue Li
Hydrogels with high mechanical strength are essential for its most industrial applications. In this work, the hydrophobic SiO 2 nanoparticles (M-SiO 2 NPs) modified with octadecyltrimethoxysilane were used as physical crosslinker to toughen the mechanical properties of hydrogels. The solution of monomers containing M-SiO 2 NPs, N-hydroxymethyl acrylamide (NHAM), acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), was polymerized to prepare a P(NHAM/AA/AMPS)-based composite hydrogel without any chemical cross-linker. The composition and microstructure of the hydrogel were carefully studied with Fourier transform infrared spectroscopy and scanning electron microscopy. The mechanical properties of the hydrogel were investigated through compressive and tensile tests. Dynamic swelling tests were carried out at different pH values (1.0–12.0) and salinity (2000–20,000 mg/L) to study the acid resistance, alkali resistance, and salt resistance of the hydrogel. The obtained results showed that the hydrogel exhibited excellent mechanical performance, which was attributed to the unique 3D network formed by the hydrogen bond between M-SiO 2 NPs and polymer as well as the hydrophobic association effect between the hydrophobic chains of M-SiO 2 NPs. Furthermore, the hydrophobic association effect was enhanced when contacting with salt, acid, and alkali solutions, thus endowing the hydrogel with intensified salt resistance and wider acid–base adaptability range.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 15
·
IF 1.64
Minyu Rao,Qiangwei Su,Zhenzhen Liu,Peiqing Liang,Nan Wu,Changyun Quan,Qing Jiang
The purpose of this study was to study the mechanical properties of poly(methyl methacrylate) (PMMA)-based bone cement incorporated with hydroxyapatite (HA) nanoparticles after surface modification by poly(methyl methacrylate- co -γ-methacryloxypropyl timethoxysilane) [P(MMA- co -MPS)]. PMMA and P(MMA- co -MPS) were synthesized via free-radical polymerization. P(MMA- co -MPS)-modified hydroxyapatite (m-HA) was prepared via a dehydration process between silane and HA; the bone cement was then prepared via the in situ free-radical polymerization of methyl methacrylate in the presence of PMMA and P(MMA- co -MPS)–m-HA. Fourier transform infrared (FTIR) spectroscopy, 1 H-NMR, and gel permeation chromatography were used to characterize the P(MMA- co -MPS). Thermogravimetric analysis and FTIR were used as quantitative analysis methods to measure the content of P(MMA- co -MPS) on the surface of HA. The effect of the proportion of m-HA in the PMMA-based bone cement on the mechanical properties was studied with a universal material testing machine. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay was also carried out to determine the cytotoxicity of the composite bone cement. The results showed that the surface modification of HA greatly improved the interaction between the inorganic and organic interfaces; this enhanced the mechanical properties of bone cement for potential clinical applications. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40587.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 127
·期 6
·4564-4572
·
IF 1.289
Wan-Zhong Lang,Qin Ji,Jian-Ping Shen,Ya-Jun Guo,Lian-Feng Chu
The modified poly(vinylidene fluoride) (PVDF) hollow fiber composite membranes reinforced by hydroxyapatite (HAP) nanocrystal whiskers were fabricated with wet-spinning method. The PVDF/HAP/ N -methyl-2-pyrrolidone dope solutions experienced delayed demixing mechanism, and the precipitation rate slightly increased as the HAP whisker content increased. The cross sections of PVDF-HAP and neat PVDF hollow fiber composite membranes were composed of five distinct layers: two skin layers, two finger-like sublayers, and a sponge-like layer. The Young's modulus of and tensile strength of the PVDF-HAP hollow fiber membranes gradually increased with the addition of nano-HAP whiskers. The elongation ratio was also improved, which was different from the polymeric membranes modified by other inorganic nanofillers. The permeation flux of the PVDF-HAP hollow fiber membranes slightly increased with the increase of HAP content in the composite membranes as its hydrophilicity was improved. The crystallization behaviors of PVDF in the composite membranes were also investigated. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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高影响因子
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