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Control of the mechanical behavior of bacterial cellulose by mercerization

Wu, Xinyu, Wu
http://rave.ohiolink.edu/etdc/view?acc_num=case151092096578873

Abstract Details

2018, Master of Sciences, Case Western Reserve University, EMC - Mechanical Engineering.
The process of mercerization of bacterial cellulose (BC) is elaborated in this work. During the mercerization of BC films, the structural conversion and crystallinity changes from native cellulose I to cellulose II was characterized using X-ray diffraction (XRD) and Raman spectroscopy. The shrinkage of BC samples exhibited a significant increase with increasing NaOH solution concentration. Significant changes in mechanical properties of BC after mercerization were observed using Digital image correlation (DIC). The mechanical behavior of mercerized BC was tuned finely by mercerization of BC samples in NaOH solution with different concentrations. Young’s modulus of the BC samples demonstrated a significant reduction of 30 folds by treating the BC samples with 7 M NaOH. The elongation at break increased significantly with increase in NaOH solution concentration to 7 M. Patterns were designed to protect certain parts of the material from mercerization while the rest of material was subject to the alkaline treatment. As a result, a custom designed combination of cellulose I and cellulose II was achieved efficiently within one BC sample. The isotropic BC was converted to anisotropic material with unidirectional strip patterns because of the realignment of cellulose chains. The application of Digital Image Correlation (DIC) was utilized in evaluating the strain distribution of patterned BC samples and the alteration of Poisson’s ratio between untreated BC, patterned BC and fully mercerized BC samples. The mercerized BC displayed controllable values of strength and toughness that showed its potential to be used in regenerative medicine and biomaterials manufacturing.
Ozan Akkus (Advisor)
Clare Rimnac (Committee Member)
Joseph Mansour (Committee Member)
90 p.
Mechanical Engineering
Bacterial cellulose; mechanical behavior; Digital image correlation; patterning; tissue engineering

Recommended Citations

Citations

  • Wu, Wu, X. (2018). Control of the mechanical behavior of bacterial cellulose by mercerization [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case151092096578873

    APA Style (7th edition)

  • Wu, Wu, Xinyu. Control of the mechanical behavior of bacterial cellulose by mercerization. 2018. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case151092096578873.

    MLA Style (8th edition)

  • Wu, Wu, Xinyu. "Control of the mechanical behavior of bacterial cellulose by mercerization." Master's thesis, Case Western Reserve University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case151092096578873

    Chicago Manual of Style (17th edition)

case151092096578873
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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.