Diacetylenes with functional groups

For systems of rigid poly diacetylenes with functional or ionic side groups and car-boxylated or sulfonated polystyrene or sulfonated polyester-urea urethanes, molecular composites could be achieved by ionic interactions [51]. The blends exhibited no microphase separation and the miscibility on a molecular length scale was proven by infrared spectroscopic, dynamic mechanical and differential scanning calorimetry analysis. The molecular reinforcement amounted to up to 1 order of magnitude in compliance with a Halpin Tsai description and was achieved by only a few weight percent of the rigid compound. 

The need for increased stabilities, controllable sizes, and permeabilities led to the development of polymerized surfactant vesicles (12-14,20). Vesicle-forming surfactants have been functionalized by vinyl, methacrylate, diacetylene, isocyano, and styrene groups in their hydrocarbon chains or at their headgroups. Accordingly, surfactant vesicles could be polymerized in their bilayers or across their headgroups. In the latter case, either the outer or the inner vesicle surfaces could be linked separately (Figure 9). All polymerized vesicles show appreciable stabilities compared with their unpolymerized counterparts. They have extensive shelf lives and remain unaffected by the addition of up to 30% methanol. 

In contrast to diacetylenes, lipids with alkene-functionalized chains (e.g., acryloyl, dienoyl) can be polymerized in the La phase to a high degree of conversion [74], O Brien and coworkers systematically studied polymerization of acryloyl and dienoyl lipids in bilayer vesicles (see [25,26] for reviews). Subsequently, the Saavedra and O Brien groups prepared and characterized solid supported bilayers composed of dienoyl lipids (Fig. 6) [11, 75-77], Several parameters relating... 

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