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Effect of Network Structure on the Quasi-Static, Fatigue, Creep, Thermal, and Fiber Properties of Polyisobutylene-based Thermoplastic Elastomers

Pavka, Paul
http://rave.ohiolink.edu/etdc/view?acc_num=akron1377014416

Abstract Details

2013, Master of Science, University of Akron, Polymer Science.
The effect of Mn, Mw, polydispersity, hard phase content, Mc, and filler content on the bulk quasi-static, dynamic, thermal, and electrospun fiber properties of polyisobutylene-based block copolymers has been investigated. The thermoplastic elastomers (TPEs) studied had a midblock of polyisobutylene (PIB) and endblocks of polystyrene or poly-para-methyl-styrene. The midblocks were either linear or arborescent. Properties of neat and carbon black –filled TPEs were compared to those of a medical grade silica-filled silicone rubber. Mc was determined for the arborescent materials by an empirical formula developed in this thesis due to the materials’ inability to swell in hexane. Quasi-static tensile tests indicated that three parameters influence tensile strength: Mn, hard phase content, and Mc. Linear SIBS block copolymers had greater strengths than their arborescent counterparts. Mc had a profound effect on dynamic properties. Dynamic creep, stored energy, and loss energy were all determined to increase with increasing Mc for the arborescent TPEs, whereas damping increased as Mc decreased. L_SIBS31 had intermediate values of damping, dynamic creep, stored energy, and loss energy compared to the arborescent materials. Carbon black influenced all mechanical and thermal properties. The glass transition temperature of the hard phase of arb_IB_MS17 increased from 105 oC to 125 oC with incorporation of black. Black was also found to be as effective as a nitrogen atmosphere in increasing the thermal degradation temperatures of the TPEs. Secondary domain size increased with incorporation of black. This confirms previous reports that black goes preferentially into the hard phase.1 Also, carbon black strengthened and stiffened the TPEs. The tensile strength of electrospun arborescent TPE filaments was measured and found to increase with increasing solution concentration.
Judit Puskas, Dr. (Advisor)
Gary Hamed, Dr. (Committee Member)
208 p.
Polymers
thermoplastic elastomer, fatigue, creep

Recommended Citations

Citations

  • Pavka, P. (2013). Effect of Network Structure on the Quasi-Static, Fatigue, Creep, Thermal, and Fiber Properties of Polyisobutylene-based Thermoplastic Elastomers [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1377014416

    APA Style (7th edition)

  • Pavka, Paul. Effect of Network Structure on the Quasi-Static, Fatigue, Creep, Thermal, and Fiber Properties of Polyisobutylene-based Thermoplastic Elastomers. 2013. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1377014416.

    MLA Style (8th edition)

  • Pavka, Paul. "Effect of Network Structure on the Quasi-Static, Fatigue, Creep, Thermal, and Fiber Properties of Polyisobutylene-based Thermoplastic Elastomers." Master's thesis, University of Akron, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1377014416

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.