Conformational behaviour of linear and crosslinked poly(4‐but‐3‐en‐1‐ynyl‐1‐methylpiperidin‐4‐ol) in solution

Sarkyt E. Kudaibergenov, Saule S. Saltybaeva, Esen Abikenovich Bekturov, Zauresh S. Nurkeeva, Vladimir B. Sigitov, Erengaip M. Shaikhutdinov, M. F. Ermagambetov

1993

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DOI 10.1002/macp.1993.021941006

Data confidence 70 medium

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Abstract

Abstract The conformational transition expanded coil to compact globule for linear and crosslinked poly(4‐but‐3‐en‐1‐ynyl‐1‐methylpiperidin‐4‐ol), poly{1‐[2‐(4‐hydroxy‐1‐methyl‐4‐piperidyl)ethynyl]ethylene}, (1) in aqueous and aqueous‐salt solutions was investigated. The free energy of the conformational transition for linear 1. n HCl was calculated. It was shown that in aqueous solution 1 is characterized by a lower critical solution temperature (LCST). The collapse of crosslinked 1 on changing the ionization state (aqueous salt solution) and temperature was observed and is similar to a phase transition.