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Anudeep_Polam_Thesis.pdf (2.22 MB)

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Thermal and Draw Induced Crystallinity in Poly-L-Lactic Acid Fibers

Polam, Anudeep
http://rave.ohiolink.edu/etdc/view?acc_num=csu1439843418

Abstract Details

2015, Master of Science in Chemistry, Cleveland State University, College of Sciences and Health Professions.
Biodegradable polymers are extensively studied because they play a crucial role in controlled drug delivery systems and bioimplants such as stents for vascular and urological applications. Poly-L-lactic acid, a type of polyester, has been widely used in medical applications and continues to be one of the materials of choice. The crystallinity of PLLA is one of the chief modulators of its biodegradability and biocompatibility. In my work, I am investigating ways to precisely control and characterize the crystalline content of PLLA fibers drawn from the melt. The obtained fibers are initially in an amorphous state and crystallinity is induced into the fibers thermally, or by drawing them to different draw ratios. The extent of crystallinity is characterized using Raman spectroscopy and Raman hyperspectral imaging. Raman spectroscopy is used to confirm crystallinity in the induced polymer thread whereas the Raman hyperspectral imaging technique provides us the detailed maps of crystalline and amorphous domains within the polymer. Crystallinity is induced in fibers using both methods. In the first case where crystallinity is induced thermally, crystalline domains are not uniformly distributed throughout the fiber. When crystallinity is induced by stretching a fiber at a temperature below its crystallization but above the glass transition temperature, a more uniform degree of crystalline content results. If the draw axis of the fiber leads to unequal stretching of the fiber, the crystallinity along the length of the fiber is more variable. There effects are observable using Raman hyperspectral imaging followed by hyperspectral image analysis.
John F Turner II, Ph.D (Committee Chair)
Xue-Long Sun, Ph.D (Committee Member)
Baochuan Guo, Ph.D (Committee Member)
48 p.
Analytical Chemistry
PLLA fibers, Raman spectroscopy, Raman hyperspectral imaging

Recommended Citations

Citations

  • Polam, A. (2015). Thermal and Draw Induced Crystallinity in Poly-L-Lactic Acid Fibers [Master's thesis, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1439843418

    APA Style (7th edition)

  • Polam, Anudeep. Thermal and Draw Induced Crystallinity in Poly-L-Lactic Acid Fibers. 2015. Cleveland State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1439843418.

    MLA Style (8th edition)

  • Polam, Anudeep. "Thermal and Draw Induced Crystallinity in Poly-L-Lactic Acid Fibers." Master's thesis, Cleveland State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1439843418

    Chicago Manual of Style (17th edition)

csu1439843418
667
© 2015, all rights reserved.
This open access ETD is published by Cleveland State University and OhioLINK.