Hydrophobic water‐soluble polymers, 1. Dilute solution properties of poly(1‐vinyl‐2‐piperidone) and poly(N‐vinylcaprolactam)

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Abstract
Poly(vinyllactams) form a class of non‐ionic water‐soluble polymers from which only poly‐(1‐vinyl‐2‐pyrrolidone) (PVP) is well known and has been investigated extensively. The homologues poly(1‐vinyl‐2‐piperidone) (1, poly[1‐(2‐oxo‐1‐piperidyl)ethylene]) and poly(N‐vinylcaprolactam) (2, poly[1‐(2‐oxoperhydroazepin‐1‐yl)ethylene]) which are still soluble in water at room temperature have not yet been studied in aqueous solution. In this work the synthesis of these two polymers by radical polymerization in solution and the investigation of the dilute aqueous solution properties of these polymers by static and dynamic light scattering measurements are presented. Special attention is paid to the influence of the increasing hydrophobicity of these polymers on coil dimensions and structures in aqueous solution.