PhD Defense by Tom Wyatt

Event Details
  • Date/Time:
    • Thursday April 30, 2015 - Friday May 1, 2015
      1:00 pm - 2:59 pm
  • Location: MRDC 4404
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Summary Sentence: Oligomer spin-solvent gel-fiber spinning

Full Summary: No summary paragraph submitted.

PTFE PhD Defense - Tom Wyatt


Date: April 30, 2015

Time: 1:05 PM

Location: MRDC 4404



Dr. Donggang Yao, MSE (Advisor)

Dr. Yulin Deng, ChBE

Dr. Anselm Griffin, MSE

Dr. Satish Kumar, MSE 

Dr. Youjiang Wang, MSE



Oligomer spin-solvent gel-fiber spinning




Successful processing of polymer molecules into well oriented fiber structures with minimal defects is difficult because the thermodynamically favorable state is a random coil, and molecular relaxation perpetually opposes efforts to extend and orient polymer molecules. This dissertation introduces the oligomer spin-solvent approach for gel-spinning high-strength fibers from many polymers with different chemistries. The theory is applied to two semi-crystalline, linear polymers without significant hydrogen bonding interactions: polyoxymethylene (POM) and polyethylene oxide (PEO). The resulting fibers are among the strongest POM and PEO fibers ever created. The efficiency of the gel-spinning process is increased through a mechanical solvent extraction method. By exploiting the unique solid-like behavior of the gel-fiber network, this work demonstrates that the spin-solvent can be separated from the gel-fiber by mechanically deforming the gel-network instead of chemically through an extraction solvent. A relatively safe and efficient gel-spinning process based on mechanical spin-solvent extraction is demonstrated using ultra-high molecular weight polyethylene.

Additional Information

In Campus Calendar

Graduate Studies

Invited Audience
defense, graduate students, PhD, PTFE
  • Created By: Tatianna Richardson
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  • Created On: Apr 23, 2015 - 8:43am
  • Last Updated: Oct 7, 2016 - 10:11pm