Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

Table 5

EDX chemical ratio of Ca/P of apatite on the surface of POM/HA-g-PEG composites.

Sample	Ca/P ratio
	at.%	wt. %
POM	1.52	1.96
POM/5.0% HA-g-PEG 600	1.47	1.90
POM/5.0% HA-g-PEG 2000	1.83	2.37
POM/5.0% HA-g-PEG 6000	2.03	2.63