Characterizing Mechanical and Gas Transport Properties of Nitrile Norbornene (NN) ROMP in Preparation for Analysis of OMe-NN-ROMP Block Copolymers
Name
qian-sxqian-sb-dmse-2023-thesis.pdf
Description
Thesis PDF
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2.24 MB
Format
Adobe PDF
Checksum (MD5)
2e2753cfe115f4f726433c29f05a3ba0
Author(s)
Qian, Sherrie
Advisor(s)
Smith, Zachary
Date Issued
June 2023
Publisher
Massachusetts Institute of Technology
Abstract
This study characterized the mechanical and gas transport properties of nitrile norbornene ROMP. At a concentration of 0.15 M, the nitrile norbornene was able to successfully ROMP without becoming gel-like allowing for further characterization. The number average molecular weight was found to be 155 kDa with a polydispersity of 31.04. Thermal analysis of the nitrile norbornene ROMP indicated a T subscript g at 150 °C and a degradation temperature at 410 °C. The density nitrile norbornene ROMP was calculated to be 1.046 ± 0.0290 g/cm³. Using a simulation of the repeat unit the Van der Waals volume was found to be 73.4881 ± 0.1674 cm³ mol-1 and subsequently the fractional free volume was shown to be 0.1614 ± 0.028. The permeation of the 6 pure gases through the film were lower compared to OMe-ROMP with the highest permeating gases being He, H₂, and CO₂ . The selectivities for all the gases were higher than OMe-ROMP which is expected given the drop in permeation. The nitrile norbornene film did plasticize in intervals and the specific plasticization pressure is higher than 5 bar which is the CO₂-induced plasticization pressure point for the OMe-nitrile norbornene ROMP one-pot copolymers. Forming a block copolymer using nitrile norbornene ROMP with OMe-ROMP has potential for securing the mechanical stability from the nitrile norbornene ROMP while maintaining the high gas transport performance from the OMe-ROMP.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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