We present two classes of polymeric organogels here.  First, A series of AB diblock copolymers consisting of poly(Lysine(Z)) (A = P(Lys(Z))) and poly(propylene oxide) or polyhedral oligomeric silsesquioxane (B = PPO, POSS) were synthesized and found to form stable, rigid organogels in THF and chloroform (ca. 1 � 4 wt.% solutions) at room temperature.   In these systems, the protecting group on the P(Lys) side-chains remains intact.  As such, the secondary structure of the polypeptide chains retains helicity over a wide range of solution conditions.   Gel formation in these systems results from the assembly of the solventphobic P(Lys(Z)) chains, which pack densely in an anti-parallel fashion, minimizing interfacial curvature.  In the second system, we describe a new method for the facile, 1-pot synthesis of polymeric organogels through modification of Jeffamine chain-ends with a diisocyanate. This precursor can then be dissolved in the desired liquid phase and, upon addition of an amine, gelled. This study attempts to identify the mechanism by which gelation takes place in Jeffamine-based materials and determine how factors such as polymer backbone (R1), diisocyanate spacer (R2), amine capping agent (R3) and solvent polarity affect mechanical properties.

Polymeric organogels:  Two different motifs to maximize hydrogen bonding

247th National Meeting (2014)

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