PhD Defense by Ke Qiu

Event Details
  • Date/Time:
    • Monday May 20, 2019
      1:00 pm - 3:00 pm
  • Location: Love 210
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Summaries

Summary Sentence: Cellulose Nanocrystal/Polymer Nanocomposites: Processing Strategies, Structure Variation and Explored Applications

Full Summary: No summary paragraph submitted.

THE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING

 

GEORGIA INSTITUTE OF TECHNOLOGY

 

Under the provisions of the regulations for the degree

DOCTOR OF PHILOSOPHY

on Monday, May 20, 2019

1:00 PM
in Love 210

 

will be held the

 

DISSERTATION DEFENSE

for

 

Ke Qiu

 

"Cellulose Nanocrystal/Polymer Nanocomposites: Processing Strategies, Structure Variation and Explored Applications"

 

Committee Members:

 

Prof. Karl Jacob, Advisor, MSE

Prof. Hamid Garmestani, MSE

Prof. Donggang Yao, MSE

Prof. Preet Singh, MSE

Prof. Kyriaki Kalaitzidou, ME

 

Abstract:

 

Interest in the most ubiquitous and abundant organic compound—cellulose, harvested from the forest product, has increased notably over recent decades. This bio-based material has been used essentially in bio-composites or in the paper industry; mainly due to its high mechanical reinforcement ability or barrier property respectively. Its nano-scale dimensions and its capacity to form a strong entangled nanoporous network have encouraged the emergence of new high-value applications. The principle reason to utilize cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) as a reinforcing material is that we can potentially exploit the high crystal modulus of cellulose as well as the ability to chemically modify their surface structure. Its high stiffness arises from the hydrogen bond networks formed on the glucose residues from one chain with oxygen molecules on another chain. By selecting the appropriate polymer of choice, the polymer matrix will be bonded strongly with cellulose.

 

The first part of this thesis is to compare different processing strategies to overcome the critical challenge of use CNC in composite, which is related to their homogeneous dispersion within a polymer matrix. Different solvent-assisted routes to improve CNC dispersion in the epoxy-based composite were assessed. The optical, thermal, mechanical properties of the epoxy resin with different hardener structure were investigated. It was found the compatibility of CNC in polymer matrices will strongly affect its reinforcing properties.

 

The second part of this thesis is exploring new applications for CNCs, which is one of the significant efforts required in the Agenda 2020 nanocellulose roadmap. A low cost, biodegradable polyelectrolyte membrane with promising potential in green power generation was fabricated using the nanocellulose based nanocomposite. A highly compatible polymer matrix PVA was used to produce nanocomposite with high CNC loading. The PVA/CNC based film was chemically modified to fabricate polyelectrolyte membrane. The hydration, electrochemical and barrier performance of the crosslinked membrane were conducted to develop an understanding of the novel low dimensional proton conductor as fuel cell electrolyte for the direct methanol fuel cell application.

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Graduate Studies

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Faculty/Staff, Public, Graduate students, Undergraduate students
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Keywords
Phd Defense
Status
  • Created By: Tatianna Richardson
  • Workflow Status: Published
  • Created On: May 9, 2019 - 12:57pm
  • Last Updated: May 9, 2019 - 12:57pm