Last. Yinxi Zhang(SJTU: Shanghai Jiao Tong University)H-Index: 46
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The dynamic vulcanization process, usually used for the preparation of thermoplastic elastomers, was used to prepare polypropylene (PP)/epoxy blends. The blends had crosslinked epoxy resin particles finely dispersed in the PP matrix, and they were called dynamically cured PP/epoxy blends. Maleic anhydride grafted polypropylene (MAH-g-PP) was used as a compatibilizer. The effects of the reactive compatibilization and dynamic cure were studied with rheometry, capillary rheometry, and scanning elec...
Polymerization-filled composites (PFC) and melt-blended composites (MBC) of Kevlar pulp/high density polyethylene composites were prepared to compare their mechanical properties. It was found that break strains of PFC composites were by far higher than MBC composites for a similar fiber concentration. Tensile data were then used to compare several models of short fiber polymer composites. Of all the models tested, it was found that Berlin's approach in combination with Rosen's model for critical...
Abstract The effect of the sorbital nucleating agent on properties of the ethylene–octene copolymer (POE) toughened polypropylene (PP) was studied. The results show that the addition of POE increases notched Izod and Charpy impact strength significantly but impair the tensile strength and flexural modulus. As a nucleating agent (1,3,2,4-di( p -methylbenzylidene) sorbitol, DM) was added, the toughness and stiffness of toughed PP increased simultaneously at the same content of POE. This result sho...
Last. Elias Hage(UFSCar: Federal University of São Carlos)H-Index: 17
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The effect of processing conditions and elastomer content on the toughening of Polypropylene (PP) by melt blending with styrene/ethylene-butylene/styrene tri-block copolymer (SEBS) in a twin-screw extruder has been investigated. The parameters analyzed were: temperature profile, screw speed, and feed rate of the blend components. Their effect was evaluated through the mechanical properties (tensile strength and Izod impact resistance at room temperature) as well as the morphology of the disperse...
#1Yeong-Tarng Shieh(National Yunlin University of Science and Technology)H-Index: 23
#2Tzong-Neng Liao(NCTU: National Chiao Tung University)H-Index: 1
Last. Feng-Chih Chang(NCTU: National Chiao Tung University)H-Index: 74
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In this study, dual compatibilizers composed of the commercially available maleic anhydride-grafted polypropylene (PP–MA) and a multifunctional epoxy resin were demonstrated to effectively compatibilize the immiscible and incompatible blends of PP and poly(butylene terephthalate) (PBT). The PP–MA with a low MA content is totally miscible with PP to make the PP phase quasi-functionalized, so that the multifunctional epoxy has the chance to react with PBT and PP–MA simultaneously to form PP–MA-co-...
Abstract Phase structure of ternary polypropylene/elastomer/calcium carbonate composites has been investigated using scanning electron microscopy, dynamic mechanical analysis and differential scanning calorimetry. Two kinds of phase structure were observed either a separate dispersion of the phases or encapsulation of the filler by elastomer. The composite phase structure was determined mainly by the chemical character of the components and, to a lesser degree, by the mixing sequences of each co...
Abstract The effect of both a thermoplastic elastomer (EPDM) and short aramid fibres on polypropylene (PP) crystallization kinetics and tensile behaviour has been investigated. The results have shown that PP/EPDM blends are non-miscible in the melt, and, at low EPDM percentages in the blend (
#1W. Y. Tam(CityU: City University of Hong Kong)H-Index: 2
#2T. Y. H. Cheung(CityU: City University of Hong Kong)H-Index: 2
Last. Robert K.Y. Li(CityU: City University of Hong Kong)H-Index: 61
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The impact properties of glass-fibre/impact-modifier/polypropylene (GF/IM/PP) hybrid composites were characterized using a number of impact test methods. For the IM/PP blends, the impact fracture toughness can be measured using linear elastic fracture mechanics (LEFM) approach. For the GF/IM/PP hybrids, due to their non-compliance with LEFM, the essential work of fracture approach was employed. The impact properties of the IM/PP blends increased with IM concentration, while that of the GF/IM/PP ...
The mechanical properties and phase microstructure of ternary phase polypropylene composites have been investigated using combinations of rigid glass beads and ethylene/propylene rubber (EPR) modifiers. Particular consideration has been given to the relative interaction between these components and their dispersion within the composite. In this regard, EPR and untreated glass beads existed as independent phases, whereas EPR functionalized with maleic anhydride showed a tendency to encapsulate th...
Three-component systems with a polypropylene (PP) matrix consisting of polar elastomer (ethylene–propylene rubber and styrene–ethylene–butylene–styrene grafted with maleic anhydride) or of polar PP (PP grafted with maleic anhydride) and filler were investigated. Three microstructures of PP–elastomer–filler hybrids were obtained by processing control and elastomer or PP modification with the maleic anhydride: fillers and rubber particles were separated in the PP matrix, rubber particles with fill...
#1Xueliang Jiang(WIT: Wuhan Institute of Technology)H-Index: 8
#2Wang Zhijie(WIT: Wuhan Institute of Technology)H-Index: 4
Last. Chu Yao(WIT: Wuhan Institute of Technology)H-Index: 7
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Barium titanate/nitrile butadiene rubber (BT/NBR) and polyurethane (PU) foam were combined to prepare sound-absorbing materials with different stratified structures including a double-layer structure and alternating multilayered structure, respectively. The effects of the cell size of the PU foam and the thickness of the PU foam layer on the sound absorption efficiency of the BT/NBR-PU foam composite with a double-layer structure were studied, and the effects of the alternating unit number on th...
#1Xueliang Jiang(WIT: Wuhan Institute of Technology)H-Index: 8
#2Yang Zhen(WIT: Wuhan Institute of Technology)H-Index: 3
Last. Chu Yao(WIT: Wuhan Institute of Technology)H-Index: 7
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Barium titanate/nitrile butadiene rubber (BT/NBR) and polyurethane (PU) foam were combined to prepare a sound-absorbing material with an alternating multilayered structure. The effects of the cell size of PU foam and the alternating unit number on the sound absorption property of the material were investigated. The results show that the sound absorption efficiency at a low frequency increased when decreasing the cell size of PU foam layer. With the increasing of the alternating unit number, the ...
#1Zai-Ping Zou(CAEP: China Academy of Engineering Physics)H-Index: 1
#2Xiao-Bing Liu(CAEP: China Academy of Engineering Physics)H-Index: 2
Last. Xiuli Zhao(CAEP: China Academy of Engineering Physics)H-Index: 7
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Hyperbranched polyurethane (HBPU), with flexible poly(tetrahydrofuran) segments between the branching points, was designed and prepared by a simple one-pot method. HBPU and the linear analog polyurethane (LPU) were used as tougheners in the diglycidyl ether of bisphenol A (DGEBA)/amine system, respectively. The HBPU was miscible with DGEBA resin without affecting the favorable processability of the epoxy blends. It was proved that a good phase separation structure with strong interface interacti...
#1Tuan Liu(Huada: Beijing University of Chemical Technology)H-Index: 18
#2Yongxing Nie(Huada: Beijing University of Chemical Technology)H-Index: 3
Last. Xiaoyu Li(Huada: Beijing University of Chemical Technology)H-Index: 29
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The synthesis of epoxide-terminated hyperbranched polyethers (EHBPEs) with different backbone stiffness and molecular weight (MW) is obtained using simple one-pot A2 + B3 approach. When used as tougheners for DGEBA/TETA system, non-phase-separated cured networks are always obtained. Effects of MW and backbone stiffness on the toughening performance were systematically investigated. Among the EHBPEs studied, EHBPE-4C which has the lowest MW and stiffest backbone and EHBPE-10C which has the highes...
#1Tuan Liu(Huada: Beijing University of Chemical Technology)H-Index: 18
#2Yongxing Nie(Huada: Beijing University of Chemical Technology)H-Index: 3
Last. Xiaoyu Li(Huada: Beijing University of Chemical Technology)H-Index: 29
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The facile controlled synthesis of an epoxide-terminated hyperbranched aromatic polyether (EHBPE) that is suitable for mass production is demonstrated using a one-pot A2 + B3 approach by taking advantage of competing reactions. When used as toughener for the DGEBA/TETA curing system, non-phase-separated hybrids with notable improvements in toughness are obtained. Moreover, the addition of EHBPE also simultaneously improves the glass transition temperature (Tg) and tensile strength. Tg, tensile s...
A new epoxy-ended hyperbranched polyether (HBPEE) with aromatic skeletons was synthesized through one-step proton transfer polymerization. The structure of HBPEE was confirmed by Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR) measurements. It was proved to be one high efficient modifier in toughening and reinforcing epoxy matrix. In particular, unlike most other hyperbranched modifiers, the glass transition temperature (Tg) was also increased. Compared with ...
