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STRUCTURE-PROPERTY RELATIONSHIPS IN MULTILAYERED POLYMERIC SYSTEM AND OLEFINIC BLOCK COPOLYMERS

Khariwala, Devang
http://rave.ohiolink.edu/etdc/view?acc_num=case1288290405

Abstract Details

2011, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science and Engineering.
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.
Eric Baer, PhD (Committee Chair)
James Anderson, PhD (Committee Member)
Alexander Jamieson, PhD (Committee Member)
David Schiraldi, PhD (Committee Member)
207 p.
Polymers
Structure Property relationships; adhesion; interdiffusion; block copolymers; polyolefins; coextrusion

Recommended Citations

Citations

  • Khariwala, D. (2011). STRUCTURE-PROPERTY RELATIONSHIPS IN MULTILAYERED POLYMERIC SYSTEM AND OLEFINIC BLOCK COPOLYMERS [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1288290405

    APA Style (7th edition)

  • Khariwala, Devang. STRUCTURE-PROPERTY RELATIONSHIPS IN MULTILAYERED POLYMERIC SYSTEM AND OLEFINIC BLOCK COPOLYMERS. 2011. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1288290405.

    MLA Style (8th edition)

  • Khariwala, Devang. "STRUCTURE-PROPERTY RELATIONSHIPS IN MULTILAYERED POLYMERIC SYSTEM AND OLEFINIC BLOCK COPOLYMERS." Doctoral dissertation, Case Western Reserve University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1288290405

    Chicago Manual of Style (17th edition)

case1288290405
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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.