Title

POSS-Nylon 6 Nanocomposites: Influence of POSS Structure on Surface and Bulk Properties

Document Type

Article

Publication Date

6-1-2009

Department

Polymers and High Performance Materials

Abstract

Hybrid organic/inorganic nanocomposites based on polyhedral oligomeric silsesquioxane (POSS) nanostructured chemicals and nylon 6 were prepared via melt mixing. Two structurally and chemically different POSS molecules, a closed cage, nonpolar octaisobutyl POSS (Oib-POSS) and an open cage, polar trisilanolphenyl POSS (Tsp-POSS) with differing predicted solubility parameters were evaluated in the nylon matrix. Surface analysis, including quasi-static and dynamic nanoindentation and nanotribological techniques, revealed exceptional improvements in modulus and hardness along with significant reductions in friction. Additionally, surface wetting characteristics of the nylon were reversed, with POSS incorporation yielding low surface energy, highly hydrophobic surfaces. AFM, TEM/EDAX, spectroscopic techniques and thermomechanical analysis were used to evaluate nanoscale dispersion and bulk properties of the composites. Both POSS molecules exhibit preferential surface segregation behavior in the nylon matrix. Tsp-POSS, with its higher predicted solubility in nylon, exhibited enhanced dispersion and tribomechanical properties at both nano and bulk scale. 0 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1088-1102,2009

Publication Title

Journal of Polymer Science Part B-Polymer Physics

Volume

47

Issue

11

First Page

1088

Last Page

1102