Title: PolyDODT: a macrocyclic elastomer with unusual properties

Journal Article · · Polymer Chemistry
DOI: https://doi.org/10.1039/d1py01426a · OSTI ID:1846575
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [4];  [5];  [2]; ORCiD logo [6]; ORCiD logo [4]
  1. The Ohio State Univ., Wooster, OH (United States); North Carolina State University
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. Texas Tech Univ., Lubbock, TX (United States)
  4. The Ohio State Univ., Wooster, OH (United States)
  5. Texas Tech Univ., Lubbock, TX (United States); North Carolina State Univ., Raleigh, NC (United States)
  6. The Ohio State Univ., Columbus, OH (United States)
+ Show Author Affiliations

The effect of reaction conditions on the structure of poly(3,6-dioxa-1,8-octanedithiol) (polyDODT) made by Reversible Radical Recombination Polymerization (R3P) using triethylamine (TEA), H2O2 and air was investigated. 800 MHz (1 and 2D) NMR was used to investigate the polymer structures. Sensitivity analysis provided direct evidence for high purity cyclic polyDODT up to Mn ~ 100 000 g mol–1. Here, comparative analysis by High Resolution Multidetector Size Exclusion Chromatography (SEC) using integrated data showed that the cycles had lower viscosity and were more compact (both for Rg and Rh) than linear samples of similar molecular weight. However, differential data revealed unusual behavior. While lower molecular weight cyclic polymers eluted later and had lower intrinsic viscosity than their linear counterparts at the same molecular weight, at higher molecular weights the polymers showed strange behavior: both the diffusion coefficient measured by Quasielastic Light Scattering (QELS) and Mark–Houwink–Sakurada plots of intrinsic viscosity for linear and cyclic polyDODT were found to converge. R3P, an aqueous based “green” method is capable of producing polymers at the 10–100 g scale in the lab, which will allow more detailed studies of this new class of biodegradable elastomers so further experimentation can be performed to elucidate the reasons for the unusual findings.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States); Texas Tech Univ., Lubbock, TX (United States); The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018655; SC0018657; SC0018891
OSTI ID:
1846575
Journal Information:
Polymer Chemistry, Journal Name: Polymer Chemistry Journal Issue: 5 Vol. 13; ISSN 1759-9954
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
Circular macromolecules
Dilute solution
Green chemistry
NMR
PolyDODT
QELS
Ring polymers