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Thermoplastic Elastomers with Oligo (ß-Alanine) Hard Segments

Li, Kai
http://rave.ohiolink.edu/etdc/view?acc_num=akron1404831585

Abstract Details

2014, Master of Science, University of Akron, Polymer Science.
Conventional vulcanized rubbers are crosslinked by irreversible covalent bonds. Thermoplastic elastomers (TPEs) are a material with rubbery elasticity at their designed service temperature. TPEs show lot of physical properties of vulcanized rubber: softness, flexibility and resilience etc. The mechanical properties are achieved by reversible crosslink between molecular chains, such as hydrogen bond, ionic interaction or reversible covalent bonds. Due to the incompatibility, occur phase separation occurs, and the system goes into soft and hard domains. Elevating temperature weakens this kind of interaction, which enables flow of molecular chains. This feature ensures a re-processable material. Hydrogen bond is a kind of supramolecular interaction, which gives a well defined microstructure and enforces the materials. When elevating temperature, hydrogen bond weaken significantly, therefore can be use as a reversible crosslink. Oligo-ß-alanines have similar structure with nylon , which can form well-defined crystalline via hydrogen bonds. In our work, oligo-ß-alanines are made as a supramolecular crosslinker, and grafted on to butyl rubber to make a supramolecular TPE. The ß-sheet arrays are designed to phase separate and crosslink the material physically. Expecting secondary structures are observed in the material in most of cases, and this kind of interaction is relative stable upon 200oC.
Li Jia, Dr. (Advisor)
Gary Hamed, Dr. (Committee Member)
48 p.
Polymer Chemistry

Recommended Citations

Citations

  • Li, K. (2014). Thermoplastic Elastomers with Oligo (ß-Alanine) Hard Segments [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404831585

    APA Style (7th edition)

  • Li, Kai. Thermoplastic Elastomers with Oligo (ß-Alanine) Hard Segments. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1404831585.

    MLA Style (8th edition)

  • Li, Kai. "Thermoplastic Elastomers with Oligo (ß-Alanine) Hard Segments." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404831585

    Chicago Manual of Style (17th edition)

akron1404831585
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© 2014, some rights reserved.Creative Commons License Thermoplastic Elastomers with Oligo (ß-Alanine) Hard Segments by Kai Li is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.