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Thesis Hans.pdf (1.96 MB)
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MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS
Author Info
Cheng, Zhihan
ORCID® Identifier
http://orcid.org/0000-0002-3323-8002
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=case155266644473611
Abstract Details
Year and Degree
2019, Master of Sciences (Engineering), Case Western Reserve University, Macromolecular Science and Engineering.
Abstract
Poly (vinyl alcohol) (PVA), tannic acid (TA) and sodium hydroxide (NaOH) were used to prepare low flammability, mechanically strong aerogels via an environmentally friendly freeze drying method. Because of the strong interaction between TA and PVA through hydrogen bonds, PVA/TA/NaOH aerogels exhibited compressive moduli as high as 12.7 MPa, 20 times of the control PVA aerogel. The microstructure of the aerogels in this study showed that the addition of NaOH disrupt the typical “card of house” aerogel structure while the samples with TA showed a stereoscopic uniform structure. The thermal stabilities of aerogels were tested by thermogravimetric analysis, showing both a decrease on the onset of decomposition temperature, and a reduction in decomposition rate after initial char formation. The peak heat release rate and total heat release, as measured by cone calorimetry, dropped by 69% and 54% respectively after adding TA and NaOH. The mechanism of NaOH effect which could catalyze char formation is also discussed.
Committee
David Schiraldi (Advisor)
David Schiraldi (Committee Chair)
Hatsuo Ishida (Committee Member)
João Maia (Committee Member)
Pages
41 p.
Subject Headings
Materials Science
;
Polymer Chemistry
;
Polymers
Keywords
PVA, Aerogel, Tannic acid, sodium hydroxide, mechanically strong, flammability, freeze drying, sustainable
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Citations
Cheng, Z. (2019).
MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS
[Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case155266644473611
APA Style (7th edition)
Cheng, Zhihan.
MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS.
2019. Case Western Reserve University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=case155266644473611.
MLA Style (8th edition)
Cheng, Zhihan. "MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS." Master's thesis, Case Western Reserve University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case155266644473611
Chicago Manual of Style (17th edition)
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Document number:
case155266644473611
Download Count:
398
Copyright Info
© 2019, some rights reserved.
MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS by Zhihan Cheng is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.