Precision polyolefins are made using metathesis polycondensation chemistry to regulate, without equivocation, branch identity and the exact location of the branch along a polyolefin backbone .1 The changes in morphology for these precision materials are clearly different from that found in conventional random ionomers. For example, a high degree of order in the form of layered lamellae becomes apparent in the carboxylic acid polymers that have been formed.X-Ray scattering demonstrates a change in morphology, changing from clusters of ionic groups in conventional ionomers to sheets interconnected via precision hydrogen bonding � the polymer chain remains orthorhombic in spite of such a large �defect�. When the degree of ionic character becomes significant, then a reversion to highly ordered, cubic centered clusters becomes evident.2 Such clusters have never been observed previously and serve as a platform for further examination.References: 1) Berda & Wagener, �Advances in Acyclic Diene Metathesis Polymerization�, Chapter 5 in Polymer Science: A Comprehensive Reference. Vol. 5, pp 195-216, K. Matyjaszekski and M. M�llen, Editors, Amsterdam: Elsevier BV Publishers (2012); 2) Seitz,Winey, et al, Journal of the American Chemical Society, 132, 8165 (2010).

Using metathesis to control polymer morphology

246th National Meeting (2013)

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