Vapour phase polymerization technique

Eley et al. have used infrared and microgravimetric techniques to study the interaction of TiCU and AlEtj vapours with partially hydroxylated surfaces of MgO and TiOj. Treatment of both MgO and TiOj with TiCli at 308 K. followed by addition of AlEts produced low-activity catalysts for the polymerization from the vapour phase of ethylene and propylene at 293 K. No details of the effective A1 Ti ratios employed are given. 

Spin coating is one of the simplest techniques for applying thin films, but it is no use for low solubility polymers (HaU et aL, 1998). Chemical vapour deposition solves this problem because monomers are delivered to the surface in the vapour phase, eliminating the need to dissolve macromolecules. They then undergo simultaneous polymerization, resulting in the formation of a thin film. Moreover, the substrate compatibility obtained using this method is excellent for biomedical devices such as implants, membranes and microfluidic devices (Asatekin et al., 2010). 

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