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- W2890916612 abstract "We investigated the mechanical response of arange of PE and sPP samples as models of semi-crystalline polymersystems under tensile deformation. Splitting the total tensiledeformation into elastic and plastic parts shows fourcharacteristic points (A,B,C and D) from the true stress-truestrain curves, where the differential compliance and recoveryproperty change. It can be concluded that 1.the critical strains atthe points A and B are mainly due to the crystalline phaserepresenting the coupling and slips of blocks as well as lamellae.2.the critical strain at C reflects a property of the amorphousphase. It is the maximum elasticity of the ideal semi-crystallinepolymer system. At point C, a critical stress is reached whichdestroys the lamellar crystallites, followed by a formation offibrils. different crystallinity and testing conditions do notchange the entanglement state of the amorphous regions and thus thecritical stains. 3.the critical strain D is related to themolecular weight, the molecular chain structure and the testingtemperature. It is thus a property of the polymer chainitself. Intralamellar coarse slip mechanisms providesufficient degrees of freedom to accomplish a homogeneous straindistribution between crystalline and amorphous phase. It is thebasic consequence of the critical strain law. However, thesituation changes at point C. When the deformation is larger thanthe strain at point C, the strain distribution is no longerhomogeneous and the dominant deformation mechanism changes to adestruction(melt) and construction (recrystallization) process. Thecoupling between the blocks and lamellae provides the physicalbasis of the modulus and the yield stress in a semi-crystallinepolymer system. The investigations of the dynamic mechanicalrelaxation show the existence of an alpha process in sPP which canonly be understood in terms of the block slip motions inside thelamellar crystallites." @default.
- W2890916612 created "2018-09-27" @default.
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- W2890916612 date "2001-01-01" @default.
- W2890916612 modified "2023-09-27" @default.
- W2890916612 title "Understanding ofthe mechanical response of semicrystalline polymers based on theblock-like substructure of crystalline lamellae" @default.
- W2890916612 hasPublicationYear "2001" @default.
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