Effect of the crosslinking degree and the nickel salt load on the thermal decomposition of poly(2-hydroxyethyl methacrylate) hydrogels and on the metal release from them.
Polymeric matrices of poly(2-hydroxyethyl methacrylate) (PHEMA) crosslinked with different percentages of ethylene glycol dimethacrylate (EGDMA) as well as different loads of nickel salt were synthesized. Nickel release from the polymeric systems, and their thermal stability were analyzed. A high percentage of the nickel loaded was released, although strong interactions between the polymeric matrices and the nickel ion must be established since a total nickel release did not take place. The values of the diffusion coefficients showed that nickel release depended on the amount of nickel salt loaded in the polymeric matrix and also on the crosslinking degree of the gels. On the other hand, the presence of nickel salt induced an evident thermal instability in the polymeric matrices, although all the polymeric systems can be considered thermally stable.
Teijón
César
C
Departamento de Ingeniería Química, Facultad de Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
Olmo
Rosa
R
Blanco
M Dolores
MD
Teijón
José M
JM
Romero
Arturo
A
D003432:Cross-Linking Reagents / Q000737:chemistry*; D003692:Delayed-Action Preparations; D020100:Hydrogels / Q000737:chemistry* / Q000378:metabolism; D008689:Methacrylates / Q000737:chemistry; D009532:Nickel / Q000032:analysis* / Q000737:chemistry*; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry* / Q000378:metabolism; D013696:Temperature
D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D020100:Hydrogels; D008689:Methacrylates; D011102:Polyhydroxyethyl Methacrylate; C004919:ethylene dimethacrylate; D009532:Nickel