POS1-0161
N-Alkylamide Functionalization of Vinyl-Addition Polynorbornene Derivatives via Post-Polymerization Modification to Introduce Interchain Hydrogen-Bonding Interactions
Topic
S1. Polymer Synthesis
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Jun Woo Park (Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT))
Co-Author(s)
Abstract
Vinyl-addition polynorbornene (VA-PNB) exhibited high thermal stability and brittleness from strong interchain cohesive forces. We sought to resolve brittleness by applying the interchain hydrogen-bonding network of nylon (condensation polymer) to VA-PNB, introducing N-alkylamide to enable reversible intermolecular interactions. N-Alkylamide-functionalized VA-PNBs were synthesized via post-polymerization modification. To maintain advantageous of VA-PNB, we synthesized vinyl-addition poly(5-methyl-2-norbornene-gradient-methyl 5-norbornene-2-carboxylate) (VA-P(MeNB-grad-NBE)s). These copolymers were perpared by Pd2(dba)3/4PCy3/4[Ph3C]+[B(C6F5)4]- catalyst system with high monomer selectivity. Organobase-catalyzed amidation produces terpolymers, and modulates deformation resistance by varying the alkyl length. Low contents of N-dodecylamide exhibit the highest toughness with minimal loss of heat resistance, whereas higher contents degrade overall properties. The interchain hydrogen-bonding network forms more effectively at low contents, and the dodecyl chain facilitates hydrogen-bonding dissociation under deformation, enabling efficient chain relaxation. These results suggest a design principle in which efficient hydrogen bonding network formation is driven by optimized structure and distribution rather than simply higher functionality contents.
