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Investigation of the Mechanical and Thermal Properties of Poly(styrene-block-isobutylene-styrene) (SIBS) and its Blends with Thymine-Functionalized Polystyrene

Perevosnik, Kathleen A.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1226647131

Abstract Details

2008, Master of Science, University of Akron, Polymer Science.
Poly(styrene-b-isobutylene-b-styrene) (SIBS) is a thermoplastic elastomer of the saturated styrenic block copolymer type with good oxidative, thermal and chemical stability as compared to unsaturated styrenic block copolymers. This material has also been found to have excellent biostability. Currently it is used for the TAXUS coronary stent. The biomaterial uses of SIBS could be expanded if the material could be steam sterilized, but steam sterilization is not possible due to the glass transition temperature of the polystyrene phase of the block copolymer. It was hypothesized that the service temperature could be improved if functionalized polystyrene with a higher glass transition temperature were incorporated into the polystyrene phase of the SIBS. For this work, thymine-functionalized polystyrene (PSt-T) was chosen as the materials to blend with the SIBS. This material was chosen because its glass transition temperature was found to be nearly 100 °C higher than neat polystyrene, due to hydrogen bonding between the thymine functional groups. The starting materials were characterized using thermal, mechanical, and spectroscopic methods. It was shown that the mechanical properties of SIBS were greatly influenced by the specimen preparation method. Then SIBS was blended with PSt-T in solution and in melt. The data showed that 5 wt% PSt-T in the solvent cast film increased the 100, 200 and 300% moduli values. The 100% modulus increased from 0.9 MPa to 2 MPa, the 200% modulus increased from 0.8 to 2 MPa, and the 300% modulus increased from 1 MPa to 2 MPa from the neat to the 5 wt% PSt-T blend with SIBSTAR 103T in solvent cast films. The tensile strength for these films increased about 15%, consistent with reinforcement. Glass transition temperature measurements were difficult to read due to the weak transitions, but it appears there was no change because the PSt-T was not miscible with the PSt phases of the SIBS. Melt blending showed reduced moduli values and the tensile strength decreased considerably (44%), indicating heterogeneity, again most likely due to miscibility problems between the polystyrene phases of the SIBS and the PSt-T.
Judit E. Puskas, PhD (Advisor)
123 p.
Polymers
polystyrene; SIBS; thymine; DSC; NMR; FTIR; tensile strength; SIBSTAR

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Citations

  • Perevosnik, K. A. (2008). Investigation of the Mechanical and Thermal Properties of Poly(styrene-block-isobutylene-styrene) (SIBS) and its Blends with Thymine-Functionalized Polystyrene [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226647131

    APA Style (7th edition)

  • Perevosnik, Kathleen. Investigation of the Mechanical and Thermal Properties of Poly(styrene-block-isobutylene-styrene) (SIBS) and its Blends with Thymine-Functionalized Polystyrene. 2008. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1226647131.

    MLA Style (8th edition)

  • Perevosnik, Kathleen. "Investigation of the Mechanical and Thermal Properties of Poly(styrene-block-isobutylene-styrene) (SIBS) and its Blends with Thymine-Functionalized Polystyrene." Master's thesis, University of Akron, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226647131

    Chicago Manual of Style (17th edition)

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