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Journal of Electron Microscopy Advance Access originally published online on November 29, 2007
Journal of Electron Microscopy 2007 56(6):209-216; doi:10.1093/jmicro/dfm025
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Under Microscopes the Poly(styrene/butadiene) Nanoparticles

Xiaorong Wang and Pat Sadhukhan

Bridgestone Americas Center for Research and Technology, 1200 Firestone Parkway, Akron, OH 44317, USA

There has been considerable interest, both academic and industrial, in developing synthesis processes for making polymeric nanoparticles. Our effort relied on the nanoassembly concepts of block macromolecules in solutions to prepare particles with a hard core made of crosslinked plastics and a soft shell made of low Tg elastomer. By a suitable variation of the composition, polymer molecular weight and solute concentration, we were able to produce spherical, ellipsoidal, cylindrical, and chain-like nanoparticles. Under microscopes, the chain-like nanoparticles displayed very rich conformational features in diluted and dense states. Our observation on the conformation characters of the nanochains in 3D diluted state agreed well with the proposition of the self-avoid coil model. However, in 2D dense state, our observation on the nanochains appeared to be in contradiction with the segregated globule model proposed by de Gennes.

Keywords     microscopy, styrene, butadiene, polymer, nanoparticles, morphology, conformation

Received     10 April 2007, accepted 2 September 2007


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