Structure-Property Relationships In Multilayered Polymeric System And Olefinic Block Copolymers

Released on by Devang Khariwala
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  • Structure-Property Relationships In Multilayered Polymeric System And Olefinic Block Copolymers Book Detail

  • Author : Devang Khariwala
  • Release Date : 2011
  • Publisher :
  • Genre :
  • Pages : 207
  • ISBN 13 :
  • File Size : 87,87 MB
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Structure-Property Relationships In Multilayered Polymeric System And Olefinic Block Copolymers by Devang Khariwala PDF Summary

Book Description: The dissertation focuses on structure-property relationships in several polymeric systems. In part I, the effect of tie-layer thickness on delamination behavior of polypropylene/tie-layer/Nylon-6 multilayers is examined. Various maleated polypropylene resins were compared for their effectiveness as tie-layers. Delamination failure occurred cohesively in all the multilayer systems. Two adhesion regimes were defined based on the change in slope of the linear relationship between the delamination toughness and the tie-layer thickness. The measured delamination toughness of the various tie-layers was quantitatively correlated to the damage zone length formed at the crack tip. Exciting new developments in polyolefin synthesis give rise to olefinic block copolymers with properties typical of thermoplastic elastomers. Part II of the dissertation describes the material science of these unique polymers as characterized by thermal analysis, x ray diffraction, microscopy, and tensile deformation. The block copolymers synthesized by chain shuttling technology consist of crystallizable ethylene-octene blocks with low comonomer content and high melting temperature (hard blocks), alternating with amorphous ethylene-octene blocks with high comonomer content and low glass transition temperature (soft blocks). Blocky ethylene-octene copolymers differ from random copolymers in their rapid rate of crystallization and in the formation of space-filling spherulites even when the crystallinity is as low as 7 %. The crystallization kinetics of these copolymers in terms of bulk crystallization and spherulite growth rate is compared.

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