Photo-cross-linkable functional group

TPAs bearing cross-linkable oxetane functionalities (52) (Scheme 3.20) has been developed [95,96], This material can be easily photo-patterned by exposure to a very short wavelength UV light source to form a patterned and insoluble HTL. Similar photo-cross-linkable HTMs based on side-chain acrylate or styryl functional groups have been synthesized (53,54) [97]. A series of spiro-linked and photo-cross-linkable HTMs have been patented by the Canon group [98]. 

Park MK, Deng S, Advincula R (2004) Permeability and permselectivity control in photo-cross-linkable polyelectrolyte ultrathin films containing pH-switchable and benzophenone functional groups. Polym Mater Sci Eng 90 133-134... 

Vinyl indoles, which bear structural similarities to vinyl carbazole, tend to form cyclic dimers through ring substitution at the 3-position. When this position is blocked by an alkyl group, linear polymers are formed. Difunctional monomers incorporating a p-methoxystyryl group and allyl or propargyl ether functions have been synthesized for use as photo cross-linkable compounds.These monomers were found to oxidize when exposed to the atmosphere. 

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