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Structural Analysis of Microphase-separated Aggregates of Polyester/Polyhedral Oligomeric Silsesquioxane Nanocomposite by Laser Light Scattering  

Yu, Young-Chol (Department of Polymer Science and Engineering Kumoh National Institute of Technology)
Kim, Jang-Kyung (Department of Polymer Science and Engineering Kumoh National Institute of Technology)
Yoon, Kwan-Han (Department of Polymer Science and Engineering Kumoh National Institute of Technology)
Park, Il-Hyun (Department of Polymer Science and Engineering Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.31, no.6, 2007 , pp. 461-468 More about this Journal
Abstract
In order to understand the structure of the existing aggregate in the nanocomposite, which has been prepared with polyester and trisilanolisobutyl polyhedral oligomeric silsesquioxane(TBPOSS), laser light scattering(LLS) and SEM-EDS were applied to its 1,1,1,3,3,3-hexafluoro-2-propanol solution and original sample, respectively. Although aggregate particles appeared as spherical shape of the average diameter of 120 nm in SEM image, they were not microgels but almost linear copolymer chains ($M_w=2.3{\times}10^6\;g/mol$) alternating 320 molecules of TBPOSS with polyester subchains. It has been microphase-separated from the matrix polyester due to the difference of chemical composition. As the matrix, polyester chain of $M_w=4.0{\times}10^4\;g/mol$ had averagely 2.5 molecules of TBPOSS per chain. It is also found that about 93% of total TBPOSS molecules existed in matrix phase and the residual 7% in spherically aggregated phase.
Keywords
POSS; polyester; nanocomposite; light scattering; aggregate;
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