Glass transition temperature of cyclic stars

Hossain Md. D., Lu, Derong, Jia, Zhongfan and Monteiro, Michael J. (2014) Glass transition temperature of cyclic stars. ACS Macro Letters, 3 12: 1254-1257. doi:10.1021/mz500684v


Author Hossain Md. D.
Lu, Derong
Jia, Zhongfan
Monteiro, Michael J.
Title Glass transition temperature of cyclic stars
Journal name ACS Macro Letters   Check publisher's open access policy
ISSN 2161-1653
Publication date 2014-12-16
Year available 2014
Sub-type Article (original research)
DOI 10.1021/mz500684v
Open Access Status
Volume 3
Issue 12
Start page 1254
End page 1257
Total pages 4
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2015
Language eng
Formatted abstract
Cyclic homo- and diblock copolymers with different topologies were synthesized using a combination of “living” radical polymerization and “click” coupling reactions. The topologies included 2- and 3-arm stars, with the arms consisting of either cyclic or linear polystyrene. In addition, a diblock consisting of a cyclic polystyrene and a cyclic poly(acrylic acid) was also made. The topologies by imposing topological constraints due to the presence of cyclic polymers and branch points had a marked influence on the glass transition temperature (Tg). It was found that for the polystyrene topology series, the Tg increased above the glass transition temperature at infinite molecular weight for a linear chain (i.e., Tg) and correlated to the more compact nature of cyclic polymers. For the cyclic diblock of polystyrene and poly(acrylic acid), the Tg increased significantly due to separation of the blocks into their pure phases. This resulted in significant stretching of the chains and thus loss of conformation entropy.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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