Abstract
Microgel and macrogel formation during the photodimerization of cinnamoyl groups in polymer chains has been investigated through analysis of intramolecular crosslinks using spectrophotometric and light scattering measurements. The form of gels depended particularly on the amount of cinnamoyloxyethyl methacrylate (CEMA) in copoly (CEMA/MMA). For CEMA=12 mol% copolymer, microgels were formed in the early stage of reaction, and finally homogeneous macrogels in appearance were formed. The resulting microgel for CEMA=26 mol% copolymer was composed of networks having the number of intramolecular crosslinked cinnamoyl groups, nintra=1870 in 3400 units of cinnamoyl groups per polymer chain. At the onset of gelation, the volume of polymer coils due to intramolecular crosslinks became 1/350—1/10 the volume of the corresponding linear polymer of the same molecular weight. The extent of intra- and intermolecular crosslinks and contraction of polymer coils due to intramolecular crosslinks were estimated in the process of gel formation.
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