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- W2024649174 abstract "Three commercial organoclays pretreated with C 18 H 37 N + H 3 , C 18 H 37 N + (CH 3 ) 3 and (C 18 H 37 ) 2 N + (CH 3 ) 2 , were used to prepare a series of copolypropylene (cPP)-clay nancomposites by melt blending. Then, the effects of the clay content and pretreatment history on the transition and relaxation of cPP molecules in different composites were investigated in detail by dynamic mechanical analysis. The results show that the α-relaxation, ascribed to the movement of polymer main chains within the crystalline regions of different cPP composites, is activated by the increase of clay content. The main β-relaxation, assigned to the glass-rubber transition of cPP segments in amorphous portions, is greatly limited by about 3-5 wt % clay loading, whereas drastically motivated with 7 wt % clay loading, which correlates closely with the dispersion order of clay layers in different composites. Lastly, the γ-relaxation, associated with the motion of ethylene sequence of cPP chains, is restricted because of the increasing clay content. Additionally, it is found that the miscibility between cPP molecules and organoclay layers was strengthened as the clay premodifier varied from C 18 H 37 N + H 3 to C 18 H 37 N + (CH 3 ) 3 , but somewhat weakened when the premodifier changed as (C 18 H 37 ) 2 N + (C H 3 ) 2 ." @default.
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- W2024649174 date "2007-01-01" @default.
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- W2024649174 title "Transitions and relaxations of copolypropylene molecules in copolypropylene–clay composites" @default.
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- W2024649174 doi "https://doi.org/10.1002/app.24489" @default.
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