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Structure development in melt spinning, cold drawing and cold compression of poly(ethylene-co-octene) with different octene content

Shan, Haifeng
http://rave.ohiolink.edu/etdc/view?acc_num=akron1137341440

Abstract Details

2006, Doctor of Philosophy, University of Akron, Polymer Engineering.
Polyethylene has become an important commercial thermoplastic since its low density form was first produced in the 1930’s by ICI. A high density form was synthesized in the 1950’s by Ziegler and by Phillips Petroleum researchers. Ziegler catalyst based copolymers known as linear low density polyethylene was introduced in the 1970s. In recent years, new types of polyethylene have also been commercially available through the application of improved catalysts, notably metallocene catalysts. These include narrow composition distribution of ethylene copolymers with different types of comonomer and various comonomer contents. In this dissertation, we studied structure development during melt spinning, cold drawing and cold compression of such ethylene-octene copolymers with various octene contents and conventional linear low density polyethylene. One of our major concerns is to study the effects of comonomer contents on structure development in processing metallocene polyethylene copolymer. Another major concern is to compare these copolymers with conventional linear low density polyethylene. We began with the material characterization, which mainly include comonomer content and distribution, molecular weight and molecular weight distribution, isothermal and non-isothermal crystallization kinetics, melting behavior after annealing. The latter studies largely used differential scanning calorimetry (DSC). Subsequently, we studied structure development during melting spinning, cold drawing and cold compression of these materials, which mainly include the development of crystal structure, crystalline morphology, orientation factors and mechanical properties of filaments under different spinline stress and deformation ratio. The processed filaments were mainly characterized by wide angle x-ray diffraction (WAXD), small angle x-ray scattering (SAXS), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and birefringence. We correlated the formation of structure and morphology, the level of crystalline orientation factors, birefringence and mechanical properties with spinline stress levels, deformation ratios and comonomer contents. We sought to find processing-structure-properties relationships in processing these polymers.
James White (Advisor)
214 p.
metallocene; poly(ethylene-co-octene)copolymer; melt spinning; cold drawing; cold compression; melting and crystallization; structure and morphology development during processing; crystal structure; crystalline orientation; birefringence

Recommended Citations

Citations

  • Shan, H. (2006). Structure development in melt spinning, cold drawing and cold compression of poly(ethylene-co-octene) with different octene content [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1137341440

    APA Style (7th edition)

  • Shan, Haifeng. Structure development in melt spinning, cold drawing and cold compression of poly(ethylene-co-octene) with different octene content. 2006. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1137341440.

    MLA Style (8th edition)

  • Shan, Haifeng. "Structure development in melt spinning, cold drawing and cold compression of poly(ethylene-co-octene) with different octene content." Doctoral dissertation, University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1137341440

    Chicago Manual of Style (17th edition)

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© 2006, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.