Ordered nanoporous polymers from polystyrene-polylactide block copolymers

Andrew S. Zalusky, Roberto Olayo-Valles, Johanna H. Wolf, Marc A. Hillmyer

Research output: Contribution to journalArticlepeer-review

450 Scopus citations

Abstract

Nanoporous polystyrene monoliths were prepared from polystyrene-polylactide (PS-PLA) block copolymers that form hexagonally packed nanocylinders of PLA in a PS matrix. A morphology diagram was developed to determine the range in composition and molecular weight over which this morphology existed. Macroscopic alignment of these materials gave anisotropic monoliths that were subjected to mild degradation conditions leading to the chemical etching of the PLA. The resulting nanoporous monoliths consisted of a polystyrene matrix containing hexagonally close-packed, oriented, and continuous nanoscopic channels (pore size was tunable through synthesis or blending) lined with chemically accessible hydroxyl functional groups. Both the precursors and the porous materials were analyzed moleculary (size-exclusion chromatography and proton nuclear magnetic resonance spectroscopy) and structurally (small-angle X-ray scattering, scanning electron microscopy, and differential scanning calorimetry). In addition, the surface area and pore size distribution of the nanoporous monoliths were characterized (N2 adsorption measurements). These nanoporous materials have remarkable potential as hosts for nanomaterial synthesis, size-selective catalyst supports, and advanced separations.

Original languageEnglish (US)
Pages (from-to)12761-12773
Number of pages13
JournalJournal of the American Chemical Society
Volume124
Issue number43
DOIs
StatePublished - Oct 30 2002

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