JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 31
·46578
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IF 1.901
Dan Lv,Abdul Qadeer Dayo,An-Ran Wang,Sadia Kiran,Yi-Le Xu,Sha Song,Wen-bin Liu,Jun Wang,Bao-Chang Gao
A new high-performance copolymer was successfully obtained via concerted catalysis polymerization of mono-functional benzoxazine (P-a) and self-promoted 4-aminophenoxy phthalonitrile (4-APN) monomers. The FTIR and DSC curves of the P-a/4-APN in different blend ratios suggested that the monomer blends can be completely cured without the addition of curing additive. The P-a/4-APN copolymers were cured at relatively lower curing temperatures and time. The TGA curves revealed that the P-a/4-APN copolymers have good thermal stability in terms of T 5 , T 10 , and char yield. A gradual increase in the glass transition temperature ( T g ) values and decline were seen in the storage modulus as the loading of 4-APN was increased from 10 to 30 wt % in the copolymer. The SEM analyses showed that copolymer's fracture surface is dendritic, showing the stress has been dispersed to a certain extent. The study revealed that the poly(P-a/4-APN) copolymer have much better thermal stabilities than the poly(P-a), and the prepared copolymer can be used as a high-performance thermosetting resin. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46578.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46572
·
IF 1.901
Hongwei Zhao,Bing Liao,Fuwei Nian,Kun Wang,Ying Guo,Hao Pang
In this work, three kinds of HPEG-type polycarboxylate superplasticizers (PCs) were synthesized with three kinds of typical functional monomers: [diallyl dimethyl ammonium chloride (DMDAAC), 2-hydroxyethyl methacrylate (HEMA), and 2-(dimethylamino) ethyl methacrylate (DMAM), respectively. The effects of montmorillonite clay on the fluidity of cement/PC pastes were investigated. It was found that the fluidity was negatively affected by the clays in the order: DMAM-PC < HEMA-PC < conventional PC (CPC) < DMDAAC-PC. The DMAM-PC was found to disperse cement well even in presence of montmorillonite clay. The dispersion performance of DMDAAC-PC was much more effectively affected by clay due to the reaction between ammonium and montmorillonite. More study including mortar fluidity, adsorption behavior and morphology of the cement samples were investigated in details. Thermogravimetric analysis and X-ray diffraction experiments allowed us to observe the influence of PCs on the hydrated products. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46572.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46542
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IF 1.901
Yangze Huang,Erlei Yu,Yanke Li,Zhong Wei
A series of hyperbranched poly(ɛ-caprolactone) (HPCLs, denoted as D X ) with different molecular weights were synthesized by the copolymerization of GPCL (PCL initiated by glycidol) and succinic anhydride. The chemical structure of D X was characterized by 1 H-NMR gel permeation chromatography and inherent viscosity, and D X was used as the plasticizer for poly(vinyl chloride) (PVC) compared to traditional plasticizer di-(ethylhexyl) phthalate (DEHP). The thermal properties, morphology, mechanical properties, and migration stabilities of PVC films were explored with differential scanning calorimetry, thermogravimetric analysis, scanning electron microscope, tensile, and migration tests. PVC/D 1 exhibited the best plasticization efficiency up to 107%, with enhanced tensile strength (18.5 MPa) and ultimate elongation (416%) compared to PVC/DEHP (11.5 MPa and 375%, respectively). PVC/D 1 exhibited remarkably high plasticization efficiency as compared to PVC/DEHP at a plasticizer concentration of PVC below 40 wt %. Moreover, the migration test for PVC/D X films exhibited minimal plasticizers migration even at very harsh conditions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46542.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46569
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IF 1.901
Yongming Li,Qiang Ren
A nonionic surfmer (MAA-EO 23 C 12 ) was prepared and reacted with acrylamide, acrylic acid, and a double tailed hydrophobic monomer (BTMAM) to synthesize a surface-active hydrophobically associating copolymer (SHAP) through photoinitiated free radical copolymerization in aqueous solution. Fourier transform infrared and 1 H-nuclear magnetic resonance spectroscopy were used to characterize the functional monomer and the SHAP. Several performance evaluations, such as viscosification property, temperature resistance, salt tolerance, and shear resistance, were also conducted. Experiment results demonstrated that the introduced nonionic surfmer and hydrophobic monomer could endow the copolymer with excellent temperature resistance, salt tolerance, and shear resistance capability at low concentration. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46569.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46550
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IF 1.901
Hongwei Zhao,Bing Liao,Fuwei Nian,Yangyang Zhao,Kun Wang,Hao Pang
In this work, a polyamidoamine dendrimer-based polycarboxylic superplasticizer (DPC) with a crosslinked emanative structure was synthesized via simple free radical polymerization. 1 H-nuclear magnetic resonance and Fourier transform infrared spectroscopy measurements were used for structural characterization. The fluidity, rheology behavior, and compressive strength of the cement/DPC samples were investigated in detail. The DPCs performed better dispersion and dispersion maintaining capabilities, stronger water reduction capability, and higher adsorption amounts than the conventional comb-shaped superplasticizer. The dispersive capacity of the DPC increased with an increasing generation of polyamidoamine dendrimers. Besides, compared with conventional comb-shaped superplasticizer, the addition of DPC led to a delayed and lowered heat flow peak on the hydration of cement paste at early age of hydration process. Furthermore, compressive strength results showed that the cement/DPC samples performed higher compressive strength than blank cement samples. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46550.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 2
·46934
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IF 1.901
Lu Dai,Xixi Wang,Zhiyang Bu,Bo-Geng Li,Suyun Jie
Carboxyl-terminated polybutadiene (CTPB) is a widely used telechelic liquid rubber, which is mainly prepared by anionic or free-radical polymerization of 1,3-butadiene. It is known that the microstructure of liquid polybutadiene rubber largely affects its processability and mechanical properties. However, it is hard to control its microstructure in the free radical or anionic polymerization. In this study, a series of CTPB with high cis -1,4 content has been prepared for the first time via the oxidolysis and selective oxidation of cis -polybutadiene rubber (BR). Hydrogenation of their CC double bonds with p -toluenesulfonyl hydrazide/tri- n -propylamine (TSH/TPA) reagents afforded carboxyl-terminated polyethylenes (CTPE). For comparison, commercial CTPB (FCTPB), prepared by free-radical polymerization of 1,3-butadiene, was also hydrogenated and gave FCTPE with more ethyl branches. Linear CTPE (L-CTPE) was synthesized by ring-opening metathesis polymerization of 1,5-cyclooctadiene in the presence of maleic acid and subsequent hydrogenation. The microstructure of the polymers was established by FT-IR, 1 H NMR, 13 C NMR, and GPC and their thermal properties were determined by DSC and TGA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46934.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 1
·46904
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IF 1.901
Saad Ahmed,Yangben Cai,Muhammad Ali,Santosh Khanal,Shiai Xu
In this study, we incorporated commercially available p -toluene sulfonic acid coated boehmite nanofillers (commercially known as OS 1 ) into the chitosan (CS) matrix to fabricate CS–OS 1 nanocomposite membranes with a high proton conductivity for fuel-cell applications. These nanocomposite membranes were characterized by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, scanning electron microscopy, and thermogravimetric analysis. Their mechanical properties, water uptake, ion-exchange capacity, and proton conductivity were also determined. The results show that the incorporation of OS 1 to CS chains can inhibit the mobility of CS chains and, hence, enhance the thermal stability and mechanical properties of CS–OS 1 nanocomposite membranes. The composite membrane with 5 wt % OS 1 showed a proton conductivity of 0.032 S/cm; this was almost equal to that of commercially available Nafion 117. We concluded that CS–OS 1 nanocomposite membranes have potential for fuel-cell applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46904.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 1
·46912
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IF 1.901
Yongqiang Lan,Ping Peng
We fabricated novel composite membranes composed of a polymer of intrinsic microporosity (PIM-1) and carbon black (CB) nanoparticles functionalized with the silane coupling agent aminopropyl triethoxysilane to recover butanol from aqueous solutions by pervaporation (PV). Scanning electron microscopy showed that the composite membranes were dense and defect free and had good adhesion with substrates. Compared with the those of pristine PIM-1 membranes, the water contact angles of the composite membranes increased from around 86° to more than 90°; this confirmed the improvement of the hydrophobicity. The swelling degree of the 6 wt % CB-filled PIM-1 membranes dropped 23%; this indicated an increase in the swelling resistance. Furthermore, the PV results show experimentally that the incorporation of the functionalized CBs into the PIM-1 matrix considerably improved both the permeability and selectivity to butanol. At a 4 wt % CB content, the optimum separation performance, with a separation factor of 19.7 and a permeation flux of 1116 g m −2 h −1 , was achieved in an aqueous solution containing 5 wt % butanol at 30°C. It was noteworthy that the as-fabricated membranes exhibited a good separation stability. This is a step forward in terms of continuous butanol production with hybrid membranes in fermentation processes. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46912.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 12
·47231
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IF 1.901
Da Shen,Li Yuan,Guozheng Liang,Aijuan Gu,Qingbao Guan
The development of an energy-efficient strategy to prepare thermally resistant damping materials with high damping capacities (tan δ values) and broad effective damping temperature ranges (Δ T s) at high temperatures (>150 °C) is still an interesting challenge. In this study, a graft copolymer (PSi- g -APPO) was synthesized through the reaction between hydrogen-terminated fluorosilicone and allyl poly(phenylene oxide) (APPO), and a unique kind of photocrosslinkable film (coded as GFA) consisting of FSR, APPO and PSi- g -APPO was prepared. The resultant GFA has high thermal resistance, wide Δ T , and high tan δ. When the weight ratio of APPO to FSR to PSi- g -APPO was 81:9:10, the obtained film exhibited a broad Δ T of 64 °C and a high tan δ (≤1.01) from 157 to 221 °C; this was the best comprehensive performance among the GFA systems. The mechanism behind the excellent integrated performance of GFA was studied and was proven to be due to the unique structure of the heterogeneous GFA system. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47231.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
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
·
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
·
2018
·Vol. 136
·期 8
·47098
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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
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