Biomedical Engineering Reference
In-Depth Information
Figure 8.3.
Photoinitiatorsthatpromoteradicalphotopolymerization.(a)
Radical photopolymerization by photocleavage. Upon exposure to light,
these photoinitiators undergo cleavage to form radicals that promote the
photopolymerization reaction. (b) Radical photopolymerization by hydro-
gen abstraction. Upon UV irradiation, these photoinitiators undergo hydro-
gen abstraction from the H-donor (DH)to generate radicals.
have generally been formed from macromolecular hydrogel pre-
cursors. These are water-soluble polymers with two or more reac-
tive groups. Examples of photopolymerizable macromers include
poly(ethylene glycol) (PEG) acrylate derivatives,
29
PEG methacry-
late derivatives,
30
,
31
polyvinyl alcohol (PVA) derivatives,
25
,
32
-
33
and modified polysaccharides such as hyaluronic acid (HA)
derivatives
34
,
35
anddextran methacrylate.
36
,
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