Small-Angle Neutron Scattering on Crosslink Distribution of Epoxy Networks.
Abstract
Crosslink distribution of epoxy network of diglycidyl ether of bisphenol A (DGEBA) cured with stoichiometric amounts of meta-phenylene diamine (mPDA) was examined by small-angle neutron scattering (SANS). A monodisperse DGEBA resin with the smallest molecular weight was used to enhance the crosslink density and to simplify the network structure for deuterium-labeling. Meta-phenylene-d4 diamine (mPDAd4) was applied to label definitively the crosslinks. SANS measurements covered a reciprocal space range from 0.016 to 0.220 A-1, or, equivalently, real-space distances from 400 to 30 A. Application of SANS on the deuterium-labeled epoxy networks consistently produces a constant excess intensity over the unlabeled epoxy networks. Since the scattering intensity from total correlation of the network was negligible, as evident from measurements of SANS on the unlabeled epoxy networks and small-angle X-ray scattering on the epoxy networks, the constant excess SANS intensity can only be attributed to a uniform spatial distribution of the amine curing agent. In other words, the crosslinks are distributed uniformly throughout the epoxy network.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1985
- Accession Number
- ADA163085
Entities
People
- S. J. Bai
Organizations
- University of Dayton