Abstract
High molecular weight samples of poly(di-n-pentylsiloxane) (PDPeS), poly(di-n-hexylsiloxane) (PDHS), and poly(di-n-decylsiloxane) (PDDS) have been prepared by means of anionic (PDPeS, PDHS) and cationic (PDDS) ring-opening polymerization of the corresponding hexa-n-alkylcyclotrisiloxanes. Like the homologues with shorter alkyl substituents, all three new polysiloxanes showed two disordering transitions and formed a conformationally disordered mesophase before isotropization. Elongation of the alkyl side groups from ethyl to hexyl improved the stability of the haxagonal columnar mesophase
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