skip to main content
US FlagAn official website of the United States government
dot gov icon
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
https lock icon
Secure .gov websites use HTTPS
A lock ( lock ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.


Search for: All records

Award ID contains: 2108266

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

  1. Presented is the synthesis of cyclic polyacetylenes from alkynes and a study probing the functional group tolerance of catalyst 1. The synthesized polymers were characterized by employing GPC, NMR, and IR spectroscopy. The cyclic polyacetylenes spontaneously degrade, leading to the formation of lower molecular weight linear analogues. The degradation rate varied significantly based on the monomer substituents. These discoveries collectively reveal the functional group limits of catalyst 1 and the subsequent stability of the synthesized polymers, thus opening new avenues for advanced polymer design and applications. 
    more » « less
  2. Tacticity is critical to polymer properties. The influence of solvent on tacticity in the catalytic synthesis of cyclic polynorbornene (c-PNB) is reported. In toluene cis,syndiotactic c-PNB forms; in THF, cis,syn/iso c-PNB forms. 
    more » « less
  3. Demonstrated is the successful A 2 + B 2 RAFT step-growth polymerization of bis-acrylamides using a bifunctional trithiocarbonate chain transfer agent as the comonomer. Remarkably, homopropagation typical of acrylamides leading to branching and crosslinking was not observed. Moreover, synthesized poly(acrylamides) can be degraded by simply adding excess ethanolamine or PBu 3 . 
    more » « less