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Elastomers Physically Cross-Linked By Oligo(ß-Alanine)

Scavuzzo, Joseph J
http://rave.ohiolink.edu/etdc/view?acc_num=akron1412937878

Abstract Details

2014, Doctor of Philosophy, University of Akron, Polymer Science.
Oligomers of Nylon 3 (Oligo(ß-alanine)) were used as monodisperse crystallizable hard blocks in polyisobutylene based thermoplastic elastomers. Two molecular architectures were examined. The first was an three-arm block copolymer where a low molecular weight polyisobutylene (30,000 g/mol) was the B block and oligo(ß-alanine) was the A block. Differential scanning calorimetry showed a glass transition temperature attributable to the amorphous polyisobutylene domains, and high temperature endotherms attributable to hydrogen bonded crystalline domains of oligo(ß-alanine). Morphology was examined by transmission electron microscopy; oligo(ß-alanine) formed long thin ribbon-like domains. Wide angle x-ray diffraction determined the crystalline structure of these domains was similar to Nylon 3. This finding was supported by infrared spectroscopy. The effect of temperature on dynamic mechanical properties was examined using oscillatory shear rheology. The block copolymer showed viscoelastic solid properties at lower temperature, but at high temperature transitioned to a viscous liquid. The temperature of this transition increases with oligo(ß-alanine) segment length. Tensile tests showed ultimate strains of 1.5 MPa and ultimate elongation of 100 %. To increase the ultimate tensile properties, oligo(ß-alanine) blocks were grafted to a high molecular weight (400,000 g/mol) copolymer of polyisobutylene with 1.1 mol % of polyisoprene known as butyl rubber. The mechanical properties were improved having ultimate strength was as high as 20 MPa, and ultimate elongations in excess of 1,000 %. When butyl rubber was grafted with mixtures of non-associating piperidine amide groups and oligo(ß-alanine)s, the piperidine grafts did not interfere with the formation of crystalline oligo(ß-alanine) domains. Additionally, butyl rubber was grafted with mixtures of oligo(ß-alanine)s of different lengths. When mixed, the oligomers self-sort into discrete domains based on segment length and impart improved hysteresis and tensile set properties on the polymer.
Li Jia, Dr. (Advisor)
Gary Hamed, Dr. (Committee Member)
Matthew Becker, Dr. (Committee Member)
Abraham Joy, Dr (Committee Member)
Robert Weiss, Dr. (Committee Member)
178 p.
Chemistry; Polymer Chemistry; Polymers
Thermoplastic Elastomer; Monodisperse Hard Segments; Crystallizable Hard Segments; Polyisobutylene; Butyl Rubber; Nylon 3; Beta-Alanine

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Citations

  • Scavuzzo, J. J. (2014). Elastomers Physically Cross-Linked By Oligo(ß-Alanine) [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1412937878

    APA Style (7th edition)

  • Scavuzzo, Joseph. Elastomers Physically Cross-Linked By Oligo(ß-Alanine). 2014. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1412937878.

    MLA Style (8th edition)

  • Scavuzzo, Joseph. "Elastomers Physically Cross-Linked By Oligo(ß-Alanine)." Doctoral dissertation, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1412937878

    Chicago Manual of Style (17th edition)

akron1412937878
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