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Study of the Tunable Shape Memory Effect of Amino Acid-based Poly(ester urea)s

Li, Hao
http://rave.ohiolink.edu/etdc/view?acc_num=akron1491434744895974

Abstract Details

2017, Master of Science, University of Akron, Polymer Science.
The biomedical applications of shape memory polymers (SMPs) have been actively investigated. a-Amino acid-based poly(ester urea)s (PEUs) with excellent synthetic flexibility and performance (i.e. highly tunable properties, non-toxicity and controlled degradation capability) have been demonstrated as competitive SMPs for biomedical applications. With an aim to obtain tunable shape memory behavior and broaden the family of PEUs, we developed a series of L-alanine based PEUs with different linear diols and PEU random copolymers composed of two different diamine monomers based on L-alanine and L-valine. The polymers were characterized by nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, size exclusion chromatography (SEC), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and tensile testing. The characterization results showed that the polymers were successfully synthesized. Changing the diol chain lengths in the alanine-based PEUs and the feed ratio of two different diamine monomers in the PEU copolymers resulted in a wide range of thermal, thermo-mechanical and shape memory properties due to the polymer chain mobility. For the alanine-based PEUs, increasing the length of linear diols, the glass transition temperature (Tg) was decreased. The shape memory effect of the alanine-based PEUs was demonstrated. For the PEU copolymers, by increasing the content of the valine-based diamine monomer, the Tg was decreased and the shape memory performance was enhanced, as a result of enhancing molecular chain mobility. Overall, by employing L-alanine, we have broadened the family of PEUs and the copolymer system has also been demonstrated as a precise approach to tailor properties to fit custom needs.
Matthew Becker (Advisor)
Abraham Joy (Committee Member)
Polymers
shape memory polymer, tunable, alanine

Recommended Citations

Citations

  • Li, H. (2017). Study of the Tunable Shape Memory Effect of Amino Acid-based Poly(ester urea)s [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491434744895974

    APA Style (7th edition)

  • Li, Hao. Study of the Tunable Shape Memory Effect of Amino Acid-based Poly(ester urea)s. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1491434744895974.

    MLA Style (8th edition)

  • Li, Hao. "Study of the Tunable Shape Memory Effect of Amino Acid-based Poly(ester urea)s." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491434744895974

    Chicago Manual of Style (17th edition)

akron1491434744895974
177
© 2017, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.