N.m.r. analysis of the hydration and temperature behaviour of resolved carboxyl carbon resonances in the acid and neutralized ~t,~o-dicarboxylatopolybutadiene telechelics reveal a complex interaction between water and chain end groups participating in the formation and subsequent stability of crosslinks. A multiplicity of environments are detected above the glass transition of the host polymer matrix arising from chemical and physical inequivalences. Reasonable interpretations are advanced to account for the observed carboxyl peaks. Analysis of the temperature dependence of 13C linewidths offers further insight into the manner in which end groups influence overall motion in the polymer. Extraction of meaningful activation energies from 13C linewidth data, however, must take correlation frequency distributions into account. The anomalous behaviour of water and its influence on structure and motion is explored.
Посилання на статтю:
An n.m.r, investigation of structure and motion in hydrated a, w-dicarboxylatopolybutadiene / V. J. McBrierty and X. Zhang // Polymer. – 1994. – Vol 35. – P. 3811-3815.