dissolving n n n u2032 n u2032 tetramethyl 1 3 propanediamine 31 9 ml in 40 ml of dmf in a 250 erlenmeyer flask 1 6 dibromohexane 29 3 ml was added to the flask the reaction was purged with nitrogen covered with a septum and stirred with a magnetic stir plate the initial solution was clear a very quick reaction that exothermed and solidified occurred an off white solid polymer formed and was left to further polymerize for a week the polymer was dissolved in approximately 300 ml of deionized water and dialyzed 3500 mw in water 3 u00d7 and 1 u00d7 in water meoh 70 30 preparation of hexamethylene biscyano guanidine alt 1 9 diaminononane hexamethylene biscyano guanidine 3 99 mmoles 1 00 g and 1 9 diaminononane 3 99 mmoles 0 623 g were added to a 40 vial with a septa cap followed by 2 equivalents of concentrated hcl the mixture was heated to 135 145 u00b0 c in a shaker overnight the solid was dissolved in water and purified by centrifugation through a 3k macrosep filtration membrane preparation of 4 4 u2032 trimethylenedipiperidine alt 1 6 dibromohexane 4 4 u2032 trimethylenedipiperidine 3 466 mmoles 1 139 g was added to a 40 ml vial followed by 2 ml dmf meoh 1 1v 1 6 dibromohexane 3 466 mmoles 0 533 ml was added and the vial was capped with a septa cap the vial was purged with nitrogen and placed in a shaker for 1 week the resulting opalescent waxy solid.