POLYMER ENGINEERING AND SCIENCE
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2019
·Vol. 59
·期 5
·982-988
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IF 1.92
Yanwen Zhao,Qing Meng,Qian Zhang,Fan Wang,Qin Wang,Yuexin Wang
Oil-impregnated monomer casting (OMC) nylon composites reinforced by graphene oxide and Lanthanum(III) chloride (LaCl 3 ) were prepared by anionic ring-opening polymerization in the presence of sodium hydroxide catalyst and toluene-2, 4-diisocyanate cocatalyst. The cross-linked GO was formed by the coordination and electrostatic interactions between La 3+ and the carboxyl on the edge of GO, which resulted in an obvious reinforcement for the OMC nylon composites. The effects of different rare earth contents on mechanical and tribological properties of the composites were carried out. The results showed that the composites exhibited excellent comprehensive properties when 0.01 wt% GO and 0.007 wt% LaCl 3 were incorporated in OMC nylon. The elastic modulus, flexural strength, flexural modulus, compressive strength, notched impact strength, and elongation-at-break for the OMC nylon/GO/LaCl 3 composites increased by 6.1, 9.9, 18.2, 7.2, 40.8, and 24.4%, respectively, and the tensile strength was slightly improved. In addition, the abrasion quantity was reduced. POLYM. ENG. SCI., 59:982–988, 2019. © 2019 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 59
·期 3
·625-632
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IF 1.551
Xiaomin Yuan,Bo Zhu,Xun Cai,Kun Qiao,Shengyao Zhao,Min Zhang
Interests in improving poor interfacial adhesion in carbon fiber-reinforced polymer (CFRP) composites has always been a hotspot. In this work, four physicochemical surface treatments for enhancing fiber/matrix adhesion are conducted on carbon fibers (CFs) including acid oxidation, sizing coating, silane coupling, and graphene oxide (GO) deposition. The surface characteristics of CFs are investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, interfacial shear strength, and interlaminar shear strength. The results showed that GO deposition can remarkably promote fiber/matrix bonding due to improved surface reactivity and irregularity. In comparison, epoxy sizing and acid oxidation afford enhancement of IFSS owing to effective molecular chemical contact and interlocking forces between the fiber and the matrix. Besides, limited covalent bonds between silane coupling and epoxy matrix cannot make up for the negative effects of excessive smoothness of modified CFs, endowing them inferior mechanical properties. Based on these results, three micro-strengthening mechanisms are proposed to broadly categorize the interphase micro-configuration of CFRP composite, namely, “Etching” “Coating”, and “Grafting” modifications, demonstrating that proper treatments should be chosen for combining optimum interfacial properties in CFRP composites. POLYM. ENG. SCI., 59:625–632, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·
IF 1.551
Miao-Jun Xu,Hai-Chao Liu,Kun Ma,Bin Li,Zhi-Yong Zhang
A novel flame-retardant chain extension agent (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)-3,5-triglycidyl isocyanurate defined as DOPO-TGIC was synthesized, and its chemical structure was well characterized and confirmed. The effect of DOPO-TGIC as a synergistic agent on the flame retardancy, rheology, thermal and mechanical properties of polyamide 6/aluminum diethylphosphinate (PA6/AlPi) composites were investigated in details. The results demonstrated that PA6/AlPi/DOPO-TGIC composites (1.6 mm) successfully passed UL-94 V-0 rating with the limiting oxygen index value of 30.5% when the total loading amount of AlPi/DOPO-TGIC was 10 wt%. In order to achieve the equal flame-retardant level, the individual AlPi was required 14 wt%. The incorporated DOPO-TGIC improved the complex viscosity of PA6/AlPi/DOPO-TGIC composites due to the chain extending reaction between epoxide groups in DOPO-TGIC and the terminal groups of PA6 matrix. The mechanical performance of PA6/AlPi/DOPO-TGIC composites was also improved compared with that of PA6/AlPi composites. DOPO-TGIC stimulated to the formation of more sufficient and compact char layer during combustion. The higher melt viscosity and compact char layer of PA6 composites effectively constrained the volatilization of flammable gases, thus the heat release was reduced. Consequently, the introduction of DOPO-TGIC simultaneously enhanced the flame retardant and mechanical properties of PA6/AlPi/DOPO-TGIC composites compared with that of PA6/AlPi composites. POLYM. ENG. SCI., 59:E206–E215, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2019
·Vol. 59
·期 9
·1882-1888
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IF 1.92
Chengtao Gao,Jianbing Guo,Haibo Xie
Traditional plasticizers to modify polylactic acid (PLA) usually leads to limited biodegradation, due to its inherent non-biodegradability of additives. In this work, we report a melt blending method to modify PLA using the alginic acid and two different alginates combined with nano CaCO 3 , a fully sustainable and biodegradable component. And, the mechanical, thermal, and rheological properties of the composites are investigated. We demonstrated that the filled samples show a lower tensile strength and higher impact strength which means a toughening effect occurs. Dynamic mechanical analysis experiments showed that the calcium alginate-filled samples show higher performances than other filled samples not only in static mechanical but also dynamic mechanical properties. The fracture morphology of the samples shows that a better interfacial reaction has been constituted for gel calcium alginate between CaCO 3 and PLA. Nevertheless, the thermogravimetric analysis results indicate that a lower thermal stability has been achieved in alginate filled samples. Chemorheological study indicated the alginate-filled samples also show a lower modulus and viscosity than neat PLA. It was found that the complex viscosity decrease with the addition of alginates, in comparison with PLA/CaCO 3 composites, and the samples filled with calcium alginate show a higher viscosity than those of sodium alginate and alginic acid. The alginate derivatives showed interesting potential as new green plastic additives attributed to origin from the biodegradable natural resources with a polymeric matrix. POLYM. ENG. SCI., 59:1882–1888, 2019. © 2019 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2019
·
IF 1.92
Lixiang Shen,Ya Pan,Heqing Fu
A super hydrophobic cotton fabric was successfully prepared by a facile dip-coating method using a synthetic fluorine-free and UV curable super hydrophobic coating solution without additional particles. The obtained cotton fabric exhibited super hydrophobic property with a water contact angle above 159.5° and sliding angle 7.5°. Moreover, the treated cotton fabric could retain its super hydrophobic performance even after abrasion and accelerated laundering, as well as for different kinds of corrosive liquids. The coated cotton fabric was used to make up a surface tension-driven, gravity-assisted, floating oil–water separation device with separation efficiency above 99%. Additionally, the oil–water separation efficiency of super hydrophobic cotton fabric always was above 98% after 30 recycle times for cyclohexane–water mixture. POLYM. ENG. SCI., 59:E452–E459, 2019. © 2019 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 59
·期 3
·457-464
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IF 1.551
Tienah H. H. Elagib,Elwathig A. M. Hassan,Cheng Fan,Keqing Han,Muhuo Yu
A surface coating was successfully applied through dipping the polyacrylonitrile (PAN) precursor fibers in a carbon black (CB) bath containing a hydrolyzed binder. The coated fibers were pre-oxidized over the microwave furnace at temperatures ranging from 100°C to 170°C for different heating times. The changes in chemical structure were studied by Fourier transfer infrared spectroscopy combined with elemental analyzer. X-ray diffraction was employed to study the crystalline structure and its related parameters. Differential scanning calorimeter and thermogravimetry were used for thermal analysis. In addition, the fiber morphology and the mechanical properties were also evaluated. Scanning electron microscopy results confirmed the presence of CB on the surface of PAN precursor. The analysis in the chemical structure showed an apparent response of coated PAN fibers to the microwave heating, since the microwave field induced the cyclization and crosslinking reactions. The crystallinity and the crystallite height decreased. Furthermore, the tensile strength and elongation of pre-oxidized fibers decreased with the increase of heating time. The measured oxygen content revealed that the pre-oxidized fibers can withstand the high temperatures on the following stage (carbonization). POLYM. ENG. SCI., 59:457–464, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2019
·Vol. 59
·期 7
·1437-1444
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IF 1.92
Yin Tang,Lian-Fang Feng,Xue-Ping Gu,Cai-Liang Zhang
This work presents a new way of preparing bead-free and core–shell superfine polymer electrospinning fibers under the assistance of another polymer and an interfacial compatibilizer. For the electrospinning of polystyrene (PS)/CHCl 3 solution, the bead-free fiber cannot be obtained until the PS concentration is above 0.25 g/mL but its average diameter is above 10 μm. Using polyamide 6 (PA6) as an additive, the critical concentration capable of forming bead-free fiber greatly decreased and core–shell fibers with PA6 as the core and PS as the shell were obtained due to the driving effect of high spinability of PA6. The introduction of a copolymer (PS- co -TMI) of styrene (St) and 3-isopropenyl-α,α-dimethylbenzene isocyanate (TMI) can react with amine of PA6 to form the copolymer of PS and PA6 as an interfacial compatibilizer. As a result, it can further enhance the dispersion and deformation of minor component PA6 into uniform microfiber core, and drive PS to uniformly cover the surface of PA6 fibers, and finally form bead-free and core–shell superfine fibers. POLYM. ENG. SCI., 59:1437–1444 2019. © 2019 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2019
·Vol. 59
·期 10
·2008-2015
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IF 1.92
Rui Chen,Shensong Dai,Tong Guo,Hao Tang,Yuqi Fan,Hong Zhou
A novel flame-retardant hsaltryptamine phosphaphenanthrene (HTD) was successfully synthesized and characterized by Fourier transform infrared spectrometry and nuclear magnetic resonance. HTD was used to improve flame retardancy of epoxy resin (EP). When the addition content of HTD reached 4 wt%, the EP/HTD thermoset passed a UL-94 V-1 rating and had limited oxygen index value of 29.2%. Compared to neat EP, the release of heat and smoke decreased significantly due to the gaseous-phase and condensed-phase flame-retardant mechanism of HTD. The char residue after cone calorimeter test was analyzed and the results showed that the char residue of EP/8%HTD thermoset exhibited homogeneously crosslinked char layer, which acted as a good barrier for the release of heat and oxygen. The transmittance and mechanical properties of EP/HTD thermosets had been tested. EP/HTD thermoset possessed high transparency and good mechanical properties. In comparison to neat EP, tensile strength, flexural strength, and Izod unnotched impact strength of EP with 8% loading of HTD was improved by 21.9%, 20.5%, and 17.4%, respectively. POLYM. ENG. SCI., 59:2008–2015, 2019. © 2019 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 58
·期 12
·2185-2191
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IF 1.551
Xuying Nan,Yi Huang,Jianzhong Shao,Huiqiong Yan,Mingshu Wu,Yuhua Yao
Silk peptide used as a co-initiator in type 2 photo-initiator has not been known. In this study, the photoinitiation system is composed of the sensitizer, the synergist and silk peptide with low molecular weight (<3,500), which is used to initiate photopolymerization of common monomer. The same photopolymerization was performed to evaluate the co-initiating ability of four essential amino acids of silk peptide, and of four pentapeptides synthesized using them as substrates, respectively. It was suggested that the glycine residue and alanine residue on silk peptide might be mainly responsible for the co-initiating role. And the co-initiating function might be ascribed to the electron/hydrogen donation of silk peptide. Silk peptide combined with the sensitizer and iodonium salt could also efficiently initiate photo-curing of hydrogel precursors. And due to excellent water solubility of silk peptide, the water absorption of the formed hydrogel could be further improved. These studies will open an opportunity for the application of silk peptide as a biocompatible co-initiator. POLYM. ENG. SCI., 58:2185–2191, 2018. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 59
·期 2
·411-417
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IF 1.551
Xuelin Zheng,Wei Cheng,Shuning Chen,Jiawen Chen,Qinhui Chen
Urushiol praseodymium-polystyrene (UPr-PS) Janus composite particles were synthesized by emulsion swelling assisted protruding from UPr/PS core-shell composite microspheres. The effects of sulfonated time and the outer electronic configuration of metal on the shell of urushiol metal/PS composite microspheres, together with the effects of monomer type, monomer dosage and swelling time on the swelling behaviour, were studied. The morphology, chemical composition and thermal performance of UPr/PS core-shell composite microspheres and UPr-PS Janus composite particles were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analyzer (EDX), Thermogravimetric analysis (TG) and infrared spectrometer (IR). Results showed that the morphology could be controlled by the metal kind, the sulfonated time, the monomer type, the monomer dosage and the swelling time. Attributing to the novel anisotropic structure, the UPr-PS Janus composite particles will be expected to be applied in oriented catalyst. POLYM. ENG. SCI., 59:411–417, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·
IF 1.551
Ju Lv,Xueqiong Yin,Rongguo Li,Junhua Chen,Qiang Lin,Li Zhu
Superhydrophobic composite nanofibrous membranes(PP) were prepared from polycaprolactone (PCL)/polystyrene (PS) through solution blow spinning with an airbrush for oil adsorption. PP membranes were characterized by fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle, X-ray Photoelectron Spectroscopy, X-ray diffractometer, and thermogravimetric analysis instrument. The effects of mass ratio of PCL and PS on the morphology, porosity, density, cyrstallinity, thermal stability, and oil adsorption ability were investigated. PP membranes had higher density than PCL and PS, while better hydrophobicity. The saturation adsorption capacity of PP to peanut oil, motor oil, and diesel oil is 16.89 g/g, 20.33 g/g, and 12.17 g/g, respectively. After 6 cycles of reutilization, the adsorption capacity to peanut oil, motor oil, and diesel oil remained at 6.16, 7.46, and 5.33 g/g, respectively, higher than that of pure PCL membrane.The water/oil adsorption selectivity of PP was about 7:100. PP had higher oil adsorption capacities and better water/oil adsorption selectivity than the commercial oil absorbent polypropylene. PP membrane could be prepared and used in situ to separate oil from oil/water mixture. POLYM. ENG. SCI., 59:E171–E181, 2019. © 2018 Society of Plastics Engineers
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2018
·Vol. 58
·期 12
·2227-2236
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IF 1.551
Yang Ren,Shihong Zhang,Xinyi Wan,Yingqing Zhan,Jieming Zhang,Yi He
To obtain high-performance dielectric materials with high dielectric constant and low dielectric loss, novel polymer composites based on poly(arylene ether nitrile) and Ag nanoparticles decorated halloysites nanotube(HNTs) were presented. For this purpose, halloysites nanotubes were modified by bio-inspired polydopamine coating, which acted as both the template and reducing agent for decoration of HNTs by Ag nanoparticles. Moreover, a modified bio-inspired method was developed to realize the surface modification of Ag nanoparticles decorated HNTs hybrid by introducing secondary functional monomer (KH550) to polydopamine system. Therefore, the synergistic effect and good interfacial adhesion contributed to the interesting properties of resulting PEN composites. With addition of 9 wt% Ag nanoparticles decorated HNTs hybrid, the dielectric constant of PEN composite was increased from 3.2 of pure PEN to 10.6 (100 Hz), and low dielectric loss of PEN composite was remained. Furthermore, the tensile strength of PEN composite with 3 wt% of Ag nanoparticles decorated HNTs hybrid increased from 81.07 MPa of pure PEN to 101.3 MPa (increased by 25%). In addition, the glass transition temperature ( T g ) reached 171.9°C with addition of Ag nanoparticles decorated HNTs hybrid, which exhibited the significant enhancement in thermal stability. POLYM. ENG. SCI., 58:2227–2236, 2018. © 2018 Society of Plastics Engineers
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高影响因子
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