Nanodomain formation and phase separation in polymer blends

Deborah M. Hussey; Lukas Keller; Nathan A. Diachun; Andy H. Marcus; Michael D. Fayer

doi:10.1117/12.236183

25 March 1996 Nanodomain formation and phase separation in polymer blends

Deborah M. Hussey, Lukas Keller, Nathan A. Diachun, Andy H. Marcus, Michael D. Fayer

Proceedings Volume 2705, Fluorescence Detection IV; (1996) https://doi.org/10.1117/12.236183
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Picosecond fluorescence depolarization measurements of electronic excitation transfer (EET) are used to probe the structures and dynamics of polymer blends. Fluorescent chromophores are covalently incorporated into one of the polymers in the blend, and the rate of fluorescence anisotropy decay is measured using time correlated single photon counting. Analysis of the fluorescence anisotropy decays yields the time-dependence of the EET. EET is a very sensitive probe of interchromophore distance; therefore it can be used to examine the single chain structure and the spatial distribution of chains in the blend. At temperatures above the phase separation temperature, macroscopic phase separation eventually occurs. However, prior to macroscopic phase separation, the structure and dynamics of the onset of phase separation is not understood. Using EET, we are able to observe the aggregation of as few as two polymer chains at the onset of phase separation. These small aggregates are referred to an nanodomains. By lowering the sample temperature below the blend's glass transition temperature, the nanodomains can be trapped in the solid material. The number of chains in the nanodomains and the growth of the nanodomains are determined by analyzing the EET data with a detailed theory that relates the spatial distribution of chromophores to the EET observables. Varying the rate of heating allows us to study the kinetics of formation of these nanoscopic heterogeneities, and to observe the phase separation process at the molecular level, from its onset through macroscopic phase separation.

Citation Download Citation

Deborah M. Hussey, Lukas Keller, Nathan A. Diachun, Andy H. Marcus, and Michael D. Fayer "Nanodomain formation and phase separation in polymer blends", Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); https://doi.org/10.1117/12.236183

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available