Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


WeidknechtM_dis (final comments).pdf (3.01 MB)

ETD Abstract Container

Abstract Header

Mechanical Properties of Very High Molecular Weight Polyisobutylene

Weidknecht, Marcia E
http://rave.ohiolink.edu/etdc/view?acc_num=akron1404846490

Abstract Details

2014, Doctor of Philosophy, University of Akron, Polymer Science.
ABSTRACT The viscoelastic properties of elastomers have been well documented in the literature and continue to be investigated. New molecular theories and new experimental methods have both complicated and elucidated the mechanisms and phenomena of viscoelastic behavior. In both the processing and the use of elastomers, the ability to predict and to control the behavior is important if not crucial to the economical and efficient use of materials. Polyisobutylene has unique properties. It is an elastomer at room temperature but it is highly damping and it is has much higher impermeability to gasses than other elastomers. There was a unique opportunity to obtain a quantity of very high molecular weight polyisobutylene. The fractionation of a bulk polymer can yield different molecular weight and molecular weight distribution fractions according to the solubility of the size of the molecules. By fractionating a polymer, narrower molecular weight distribution samples can be isolated with presumably the same chemical properties. The investigation of entanglements and disentanglements in networks of permanent and transient networks is one area of viscoelasticity that is both interesting and practical. In this work a very high molecular weight polyisobutylene material was fractionated and characterized. Some thermal and physical properties were investigated with the intent of looking at the disentanglement of an uncrosslinked material that behaves in some ways as if it is crosslinked. All of the fractionated samples were well above the entanglement molecular weight of polyisobutylene, yet the low molecular weight fractions exhibited flow under tensile, dynamic, and stress relaxation tests. The very high molecular weight fractions and the bulk polymer behaved much more like chemically crosslinked networks in the same tests.
Stephen Cheng, Dr (Advisor)
Judit Puskas, Dr (Committee Member)
Darrell Reneker, Dr (Committee Member)
Gustavo Carri, Dr (Committee Member)
Gary Hamed, Dr (Committee Member)
192 p.
Polymers
polyisobutylene; high molecular weight polyisobutylene; stress-relaxation; crosslinked polyisobutylene

Recommended Citations

Citations

  • Weidknecht, M. E. (2014). Mechanical Properties of Very High Molecular Weight Polyisobutylene [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404846490

    APA Style (7th edition)

  • Weidknecht, Marcia. Mechanical Properties of Very High Molecular Weight Polyisobutylene. 2014. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1404846490.

    MLA Style (8th edition)

  • Weidknecht, Marcia. "Mechanical Properties of Very High Molecular Weight Polyisobutylene." Doctoral dissertation, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404846490

    Chicago Manual of Style (17th edition)

akron1404846490
661
© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.