“…In a special case, however, topochemical polymerization takes place, which means that the crystal structure remains unchanged and no area contraction occurs during the reaction (Wegner, 1969). The polymerization reaction can also be followed ex situ by various complementary techniques such as surface viscosity (Dubault et al, 1975;Rolandi et al, 1995), atomic force microscopy (Peltonen et al, 1993;Tillmann et al, 1994;Rolandi et al, 1995), fluorescence microscopy (Warta and Sixl, 1988;Meller et al, 1989;Rolandi et al, 1995), UV-vis (Tieke et al, 1979;Laschewsky et al, 1988;Mino et al, 1991;Viitala et al, 1997), and IR spectroscopy (Letts et al, 1976;Lindén et al, 1995).…”