Study on Toughening Mechanism of Low Molecular Weight PC/PP Blend
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Low molecular weight PC/PP blend was prepared by means of melt blending, and the toughening mechanism of the blend system was studied by means of mechanical test, IR and SEM, so on. Results indicated that the matrix yield and the interface adhesion failure were the main ways to dissipate impact energy. Interfacial tension had strong influence on the morphology and toughness of the blend, and to increase the interface adhesion was of benefit to the increase of the toughness of the blend. A simulating model was proposed, which could be used to explain the toughening mechanism well. PP could be used as toughening agent for PC, which could greatly increase the toughness of low molecular weight PC, without the decrease of the flowability of PC.Keywords:
Toughening
Morphology
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With SEBS-g-MAH as toughening agent,nylon 1012/SEBS-g-MAH blends were prepared by means of blending extrusion.The mechanical properties and morphology of the blends were studied.The results indicated the notched Izod impact strength of the blend improved obviously with the increase of the mass fraction of SEBS-g-MAH.When the mass fraction of SEBS-g-MAH was up to 15%,the notched Izod impact strength of the blend was 125 kJ/m2,being about 20 times as high as that of pure nylon 1012,and the retention of tensile and bending strength was more than 70%.It was also found that the toughness mechanism of the blend was of the mechanism of craze-shear bands toughening.
Toughening
Mass fraction
Nylon 6
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The effect of impact modifier ACR of nuclear-shell structure on the mechanical properties and heat resistance of PC/PBT (80/20) blend system was studied,and the morphology of the blend system was observed by means of SEM.The result showed that the Izod notched impact strength of the blend system increased first,and when ACR content was up to 15 phr,the Izod notched impact strength was the maximum,while the tensile strength and Vicat softening point(VSP) of the system decreased.
Vicat softening point
Toughening
Impact resistance
Charpy impact test
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Abstract In order to develop PP (polypropylene)‐based blends with balanced toughness and rigidity, the poly‐blends of PP/PC (polycarbonate)/POE (ethylene–octene copolymer) were prepared by applying styrene–ethylene–propylene–styrene (SEPS) as the macromolecular compatibilizer. The compatibilizing effect was studied in terms of the mechanical, morphologies and thermal properties, and the compatibilized PP‐based blends presented remarkable improvement in impact toughness and balanced tensile strength due to the formed special morphology structure. Additionally, by preparing the pre‐blend of PC/SEPS, the melt viscosity of the PP matrix can match that of the dispersed phase PC and POE, which led to a further improvement in the mechanical property of the blends. Copyright © 2009 John Wiley & Sons, Ltd.
Polypropylene
Polycarbonate
Compatibilization
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The effects of 3 toughening agents PTW,AX8900 and PT862 on the mechanical properties and crystallizability of PC/PBT(30/70)were studied,and the morphologies of the blends were observed by means of SEM.The results showed the compatibility and the notch impact strength of PC/PBT(30/70) blends were improved by the addition of toughening agents,when the content of the toughening agent was up to 15 phr,the blends had brittle/flexible transition,and the notch impact strength of the blend was about 10 times of that of PC/PBT blend containing no toughening agent.When the content of GMA increased in the 3 toughening agent,the toughening effects of the agent became more better.
Toughening
Brittleness
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The influence of adding SEBS [polystyrene-b-poly(ethylene/butylenes)] and SEP [polystyrene-b-poly(ethylene/propylene)] on the properties of different PC with different molecular weights was studied.For the PC with low and medium molecular weight,adding a small amount of SEBS and SEP increased the notched Izod impact strength of the thick samples of blends greatly,while the other mechanical properties,such as tensile strength,changed little.The results of SEM and DSC showed SEPTON had good compatibility with PC,and PC exhibited an obvious feature of brittle rupture while PC/SEPTON blends were ductile and tough.
Toughening
Polystyrene
Brittleness
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The compatibilization and toughening effect of organic silane coupling agents on bismaleimide/polyetherimide blend system was studied in this paper.The results showed that the blend fracture toughness(GIC)had a substantial increase when the organic silane coupling agents KH-550,KH-560 and B were added into the blends respectively,and the B showed the best toughening effect;when B content was 2.5 phr in blends,the fracture toughness was the highest,reaching to 1053 J/m~2 and 3.9 times of that for before modification;the morphology(SEM)of blends became double continuous phase structure from two-phase structure for before modification.
Polyetherimide
Toughening
Compatibilization
Morphology
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Elongation
Toughening
Polypropylene
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The feature of PP/HDPE/SBS blend was studied. As the result, the relation between the impact strength of pp blend with the content of HDPE/SBS is found. After technical economics analysis, the best compounds of PP/HDPE/SBS is found. The strength of the blend can be improved by add the glass fibre. The toughening and strength of the modified blend are well, it can be used as engineer platics in more and more application fields.
High-density polyethylene
Toughening
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The effect of different blend ratio of PP/PC toward the crystallization behavior of PP and the mechanical properties of the blends were studied. The compatibility of PP/PC blends by adding PP-g-MAH as compatibilizer and PF as assistant compatibilizer was discussed. The physical properties and phase structure of PP/PC blended through single-screw extruder or twin-screw extruder were compared. It shows that with the adding of PC, the size of PP spherulites becomes smaller, the crystallinity degree decreases, the crystal irregularity increases and the strength of PP/PC blends raises but the toughness drops. Adding PP-g-MAH modified the strength and toughness at the same time and adding PF simultaneously further increases the strength of the blends, but the toughness turns bad. The temperature difference between T_g and T_m of PP/PP-g-MAH/PC is (2.9) ℃ smaller than that of PP/PC, which shows that PP-g-MAH indeed acts as a compatibilizer. It is found that twinscrew extruder gives better blending result.
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Super-tough nylon 6 was prepared by using maleic anhydride grafted polyethylene-octene rubber/semicrystalline polyolefin blend (TPEg) as an impact modifier. The morphology, dynamic mechanical behavior, mechanical properties, and toughening mechanism were studied. Results indicate that TPEg with a semicrystalline polyolefin core and a polyethylene-octane rubber shell, possesses not only a better processability of extruding and pelletizing with a lower cost, but also an improved toughening effect in comparison with the maleated pure polyethylene-octene rubber. The shear yielding is the main mechanism of the impact energy dissipation. In addition, the influence of melt viscosity of nylon 6 on toughening effectiveness was also investigated. High melt viscosity of matrix is advantageous to the improvement of notched Izod impact strength. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1987–1994, 1998
Polyolefin
Maleic anhydride
Octene
Vicat softening point
Compatibilization
Nylon 6
Melt flow index
Heat deflection temperature
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