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Transport Phenomena in Polymeric Blends and Multilayer Films

Feng, Jingxing
http://orcid.org/0000-0002-3191-7431
http://rave.ohiolink.edu/etdc/view?acc_num=case1548202751756984

Abstract Details

2019, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science and Engineering.
This work targeted to unveil the processing-structure-property relationships of four polymeric systems with diverse transport properties. The first and the second chapters concentrated on a through-pore membrane derived from polypropylene (PP) and polyamide 6 (Nylon 6) blends. The other three chapters discussed the adjustable gas barrier properties in regards to the morphologies of polymer blends and multilayer films. Among all the chapters, gas and liquid transport properties were proved as an effective identifier for the morphology. The change in transport phenomena was strongly correlated with the shift in the structure. In Chapter One and Chapter Two, porous membranes were produced from biaxial orientation of polymer blends comprising PP, Nylon 6, and polypropylene grafted maleic anhydride (PPgMA). During biaxial orientation, the continuous PP domains cavitated while the dispersed Nylon 6 domains remained rigid and spherical. The effect of blend composition on cavitation was analyzed and a ternary diagram generated to identify the composition range for through-pore formation. The membranes were found to have adjustable porosity up to 62% with nanoscale size pores. The membranes show very high filtration efficiency on separating 50 nm Latex microbeads from water suspensions. In Chapter Three, the compatibilization effect of linear low density polyethylene grafted maleic anhydride (LLDPEgMA) and high density polyethylene grafted maleic anhydride (HDPEgMA) on high density polyethylene (HDPE) /Nylon 6 blend system was investigated. HDPEgMA was identified as a better compatibilizer than LLDPEgMA for the HDPE/Nylon 6 blend system. In Chapter Four, multilayer films comprising polystyrene (PS)/polymethyl methacrylate (PMMA) and PS/polycaprolactone (PCL) alternating nanolayers with varied layer thickness were fabricated by multilayer coextrusion. The continuous layers started to break up into nanosheets and nanodroplets during the coextrusion process when the nominal layer thickness decreased to between 30 nm and 40 nm. Further decrease of the nominal layer thickness of PMMA and PCL resulted in less nanosheets and more nanodroplets. In Chapter Five, high oxygen barrier film/foams containing alternating ethylene-vinyl alcohol copolymer (EVOH) film layers and low-density polyethylene (LDPE) foam layers were innovated. The film/foams having low density and good oxygen barrier properties could be mechanically shaped into food packaging materials at room temperature.
Eric Baer (Committee Chair)
Andrew Olah (Committee Member)
David Schiraldi (Committee Member)
Ya-Ting Liao (Committee Member)
184 p.
Chemical Engineering; Materials Science; Packaging; Plastics; Polymers
structure-property relationships; thermoplastics; polymer blends; multilayer co-extrusion; gas transport; packaging; membranes; extrusion; biaxial orientation; compounding; compatibilization; polyolefins; foams; polymer nanodroplets; ultrafiltration

Recommended Citations

Citations

  • Feng, J. (2019). Transport Phenomena in Polymeric Blends and Multilayer Films [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1548202751756984

    APA Style (7th edition)

  • Feng, Jingxing. Transport Phenomena in Polymeric Blends and Multilayer Films. 2019. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1548202751756984.

    MLA Style (8th edition)

  • Feng, Jingxing. "Transport Phenomena in Polymeric Blends and Multilayer Films." Doctoral dissertation, Case Western Reserve University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1548202751756984

    Chicago Manual of Style (17th edition)

case1548202751756984
446
© 2019, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.