Surface Chemical Functionalization to Achieve Extreme Levels of Molecular Confinement in Hybrid Nanocomposites
Abstract
Polymer confinement is realized in hybrid nanocomposites where individual polymer molecules are confined by a nanoporous matrix to dimensions less than the molecular size of the polymer. Here it is shown that by functionalizing the interior pore surfaces of a nanoporous organosilicate matrix, the pores can be filled with polystyrene molecules to achieve extreme levels of molecular confinement not previously possible. This provides opportunities for unique thermal and mechanical properties. It is shown that pore surface functionalization markedly impacts the polymer mobility during polymer infiltration by affecting the polymer–pore surface interaction, addressing the challenge of filling high‐molecular‐weight polymer molecules into nanoscale‐confined spaces. This allows for achieving extreme levels of molecular confinement with the loss of interchain entanglement and extensive polymer elongation along the pore axis. The glass transition temperature of the polymer is suppressed compared to bulk polymer melt, and is significantly affected by the polymer–surface interaction, which changes the polymer segmental mobility. The polymer–surface interaction also affects the interfacial polymer–pore sliding shear stress during polymer pullout from the nanopores, markedly affecting the fracture resistance of the nanocomposite.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 17, 2019
- Source ID
- 10.1002/adfm.201903132
Entities
People
- Can Wang
- Geraud Dubois
- Krystelle Lionti
- Mithun Chowdhury
- Reinhold H. Dauskardt
- Rodney D. Priestley
- Scott G. Isaacson
- Teddie P. Magbitang
- Willi Volksen
- Yucheng Wang
Organizations
- Air Force Office of Scientific Research
- Indian Institute of Technology Bombay
- International Business Machines Corporation (Armonk, NY)
- National Science Foundation
- Princeton University
- Stanford University