Radiopaque polymers with enhanced radiopacity

A crosslinked polymer network comprising:

• a) a plurality of first repeating units comprising a first reagent, the first reagent defined by the formula FX1a, FX1b, FX1c or FX1d:
• wherein:
• X is Br or I;
• m is an integer selected from the range of 1 to 5;
• each R11 is, independently, a substituted or unsubstituted C6-C20 alkylene group;
• each L11 is, independently, a single bond, —(CH2)j—, —(HCCH)j—, —O—, —S—, —SO—, —SO2—, —SO3—, —OSO2—, —NR12, —CO—, —COO—, —OCO—, —OCOO—, —CONR13—, —NR14CO—, —OCONR15—, —NR16COO—, —NR17CONR18—, —SiO(Z1)(Z2)—, or —Si[SiO(Z1)(Z2)]n—,
• wherein Z1 is given by the formula L1(T1)p and Z2 is given by the formula L2(T2)q, and
• wherein each of L1 and L2 are, independently, a single bond, a polyvalent alkane radical having from 1 to 36 carbon atoms, a polyvalent heteroalkane radical having from 1 to 36 carbon atoms and including —O— or —C(O)O—, a polyvalent aryl radical having from 1 to 36 carbon atoms, or a polyvalent heteroaryl radical having from 1 to 36 carbon atoms and including —O— or —C(O)O—, and
• wherein each of T1 and T2 are, independently, a polymerizable group having a terminal (meth)acrylate, (meth)acrylamide or styryl group, and
• wherein n is an integer selected from the range of 1-10;
• each Ar11 is, independently, an iodine- or bromine-containing C5-C36 aryl group containing one or more rings, or an iodine- or bromine-containing C5-C36 heteroaryl group containing one or more rings;
• and
• wherein each of R12-R18 is, independently, hydrogen or a C1-C10 alkyl group and each j is, independently, an integer selected from the range of 1 to 10;
• b) a plurality of second repeating units comprising a second reagent, the second reagent defined by the formula Z3aX1cSidOeZ4b;
• wherein:
• Z3 is given by the formula L3(T3)p and Z4 is given by the formula L4(T4)q,
• wherein each of L3 and L4 are, independently, a single bond, a polyvalent alkane radical having from 1 to 36 carbon atoms, a polyvalent heteroalkane radical having from 1 to 36 carbon atoms and including —O— or —C(O)O—, a polyvalent aryl radical having from 1 to 36 carbon atoms, or a polyvalent heteroaryl radical having from 1 to 36 carbon atoms and including —O— or —C(O)O—,
• wherein each of T3 and T4 are, independently, a polymerizable group having a terminal (meth)acrylate, (meth)acrylamide, or styryl group;
• each X1 is, independently, an alkyl group, a (meth)acrylate group, a (meth)acrylamide group, or a styryl group having 1 to 36 carbon atoms;
• each a, b and d are, independently, integers selected from the range of 1 to 10 and each c and e are, independently, integers selected from the range of 1 to 20;
• and
• p and q are each, independently, an integer selected from the range of 1 to 9;
• and
• c) a plurality of third repeating units comprising a third reagent, the third reagent comprising at least three terminal (meth)acrylate, (meth)acrylamide, or styryl groups.