Synthesis and characterization of novel star polymers

Subramanian Ramakrishnan, Robert Lambeth, Ryan Mueller, Jeffrey S Moore, Charles Zukoski

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The key to forming novel microstructures using self assembly of nanoparticles is to code the instructions for assembly by chemically modifying the particle surface. The resulting patchy nanoparticles can then be assembled into a variety of microstructures. In this work, we report on synthesis and characterization of novel four arm star polymers in which each arm is a block copolymer. The inner segment in each arm is made of N-isopropylacrylamide (NIPAM) and the outer segment is made of dimethylacrylamide. (DMA). The polymers are synthesized by the reversible addition fragmentation chain transfer mechanism (RAFT) and are of a low polydispersity (Mw/Mn ∼ 1.2). The functional group at the end of each arm in the star polymer can be changed by using a different chain transfer agent. When suspended in aqueous solutions at room temperature, the stars are in a good solvent. When the temperature is increased to a value higher than 32oC, the NIPAM segment collapses thus giving rise to a patchy nanoparticle. Initial results show that the collapsed nanoparticle aggregates into a monodisperse structure - the size of which can be tuned by changing the block lengths of NIPAM and DMA.

Original languageEnglish (US)
Title of host publication05AIChE
Subtitle of host publication2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
Number of pages1
StatePublished - 2005
Externally publishedYes
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005


Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • General Engineering


Dive into the research topics of 'Synthesis and characterization of novel star polymers'. Together they form a unique fingerprint.

Cite this