The Development of End-group Functionalized Polyolefin Building Blocks through LCCTP

Sunday, February 14, 2016
Tessy Thomas, University of Maryland, College Park, MD
The development of living coordination chain transfer polymerization utilizing the cationic hafnium monocyclopentadienyl, monoacetamidinate derivative, [(η5-C5Me5)Hf(Me)[N(Et)C(Me)N(Et)][B(C6F5)4], as the active initiator in the presence of excess equivalents of main-group-metal alkyl ‘surrogate’ chain growth centers has provided a viable path to practical and scalable bulk quantities of structurally-well defined polyolefins that are further characterized by having tunable molecular weight, narrow polydispersity and end-group functionality, including  –OH, -I, -N3 and –COOH chemical moieties.  These low molecular weight, atactic end-group functionalized polyolefins are further attractive as building blocks for new types of polyolefin materials with novel polymer architectures and properties.   In the present work, the synthetic utility of the -I and -OH end group functionalized polyolefins has been explored to develop several ‘bio-inspired’ self-assembled materials that have been characterized in solution and ultra-thin film state by an arsenal of techniques, including TEM, AFM, GPC, DLS, MALDI-TOF and NMR in order to establish the potential utility in nanotechnology.