Figure 4.
High-magnification images of the fracture surfaces: (a,b) GF/PEI-0 and (c,d) GF/PEI-85 and (e,f) GF/PEI-145.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.