An ordered ladder polyester (LPE) was first synthesized through the ladder superstructure (LS) constructed by concerted interactions of hydroxyl- and aramide-based H-bonding and p-terphenyl (TP)-based re-stacking by dehydrochlorination condensation using phosgene (COCl2) as coupling agent. LPE was characterized by GPC, FTIR, NMR, XRD, DSC and AFM. Among them, a distinct image of regularly linear alignment corresponding to the ladder main chain of LPE was first revealed by high-resolution AFM.
A novel soluble regular ladder poly(benzoyl-3-aminopropyl) silsesquioxane (LPBAS) was facilely prepared under effective assistance of concerted H-bonding self-assembly of amido groups of side chains and silanol groups, respectively, of a new template monomer [1,3-bis(benzoyl-3-aminopropyl)-1,1,3,3-tetraethoxydisiloxane] (M). The ordered ladder structure of LPBAS is manifested in: (1) the presence of two Bragg peaks representing the ladder width (d) and ladder thickness (t) in X-ray diffraction (XRD) pattern; (2) narrow base-line width (w = 6) of resonance absorption for -CH2SiO3/2 moiety in 29Si-NMR and (3) high glass transition temperature Tg = 112℃in differential scanning calorimetry (DSC) analysis.
A novel soluble and reactive amide-bridged ladderlike polyhydrosiloxane(ALPHS)was first synthesized by an amido H-bonding self-assembled template.ALPHS with molecular weight (?)_n=18300 has very highly ordered ladderlike structure,which was confirmed by a sharp resonance absorption peak of[—Si(H)O_(2/2)]moiety with the half peak width Δ_(1/2)＜0.5 in ^(29)Si-NMR spectrum.Presence of the reactive Si—H groups gives ALPHS an opportunity to further derive a variety of functional polymers by versatile Si—H reactions such as hydrosilylation,condensation,and so on.
