skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Use of self assembled monolayers at variable coverage to control interface bonding in a model study of interfacial fracture: Pure shear loading

Abstract

The relationships between fundamental interfacial interactions, energy dissipation mechanisms, and fracture stress or fracture toughness in a glassy thermoset/inorganic solid joint are not well understood. This subject is addressed with a model system involving an epoxy adhesive on a polished silicon wafer containing its native oxide. The proportions of physical and chemical interactions at the interface, and the in-plane distribution, are varied using self-assembling monolayers of octadecyltrichlorosilane (ODTS). The epoxy interacts strongly with the bare silicon oxide surface, but forms only a very weak interface with the methylated tails of the ODTS monolayer. The fracture stress is examined as a function of ODTS coverage in the napkin-ring (pure shear) loading geometry. The relationship between fracture stress and ODTS coverage is catastrophic, with a large change in fracture stress occurring over a narrow range of ODTS coverage. This transition in fracture stress does not correspond to a wetting transition of the epoxy. Rather, the transition in fracture stress corresponds to the onset of deformation in the epoxy, or the transition from brittle to ductile fracture. The authors postulate that the transition in fracture stress occurs when the local stress that the interface can support becomes comparable to the yield stress ofmore » the epoxy. The fracture results are independent of whether the ODTS deposition occurs by island growth (T{sub dep} = 10 C) or by homogeneous growth (T{sub dep} = 24 C).« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755610
Report Number(s):
SAND2000-1228J
TRN: AH200021%%356
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Journal of Adhesion
Additional Journal Information:
Other Information: Submitted to Journal of Adhesion; PBD: 16 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; INTERFACES; FRACTURE PROPERTIES; BONDING; INORGANIC COMPOUNDS; EPOXIDES; SILICON OXIDES; ADHESIVES

Citation Formats

KENT, MICHAEL S, YIM, HYUN, MATHESON, AARON J, COGDILL, C, NELSON, GERALD C, and REEDY JR.,EARL DAVID. Use of self assembled monolayers at variable coverage to control interface bonding in a model study of interfacial fracture: Pure shear loading. United States: N. p., 2000. Web.
KENT, MICHAEL S, YIM, HYUN, MATHESON, AARON J, COGDILL, C, NELSON, GERALD C, & REEDY JR.,EARL DAVID. Use of self assembled monolayers at variable coverage to control interface bonding in a model study of interfacial fracture: Pure shear loading. United States.
KENT, MICHAEL S, YIM, HYUN, MATHESON, AARON J, COGDILL, C, NELSON, GERALD C, and REEDY JR.,EARL DAVID. 2000. "Use of self assembled monolayers at variable coverage to control interface bonding in a model study of interfacial fracture: Pure shear loading". United States. https://www.osti.gov/servlets/purl/755610.
@article{osti_755610,
title = {Use of self assembled monolayers at variable coverage to control interface bonding in a model study of interfacial fracture: Pure shear loading},
author = {KENT, MICHAEL S and YIM, HYUN and MATHESON, AARON J and COGDILL, C and NELSON, GERALD C and REEDY JR.,EARL DAVID},
abstractNote = {The relationships between fundamental interfacial interactions, energy dissipation mechanisms, and fracture stress or fracture toughness in a glassy thermoset/inorganic solid joint are not well understood. This subject is addressed with a model system involving an epoxy adhesive on a polished silicon wafer containing its native oxide. The proportions of physical and chemical interactions at the interface, and the in-plane distribution, are varied using self-assembling monolayers of octadecyltrichlorosilane (ODTS). The epoxy interacts strongly with the bare silicon oxide surface, but forms only a very weak interface with the methylated tails of the ODTS monolayer. The fracture stress is examined as a function of ODTS coverage in the napkin-ring (pure shear) loading geometry. The relationship between fracture stress and ODTS coverage is catastrophic, with a large change in fracture stress occurring over a narrow range of ODTS coverage. This transition in fracture stress does not correspond to a wetting transition of the epoxy. Rather, the transition in fracture stress corresponds to the onset of deformation in the epoxy, or the transition from brittle to ductile fracture. The authors postulate that the transition in fracture stress occurs when the local stress that the interface can support becomes comparable to the yield stress of the epoxy. The fracture results are independent of whether the ODTS deposition occurs by island growth (T{sub dep} = 10 C) or by homogeneous growth (T{sub dep} = 24 C).},
doi = {},
url = {https://www.osti.gov/biblio/755610}, journal = {Journal of Adhesion},
number = ,
volume = ,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2000},
month = {Tue May 16 00:00:00 EDT 2000}
}