| http://www.w3.org/ns/prov#value | - g at least a hydrophobic segment. [0234] The polymeric azo initiator used in the third embodiment includes a compound having the structure of formula (I) wherein D is a hydrophobic segment, and L1 and L2, which may be the same or different, each represent a hydrophilic linking group, such as an ester linkage or an amido linkage.
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