Effect of End Functionality of Surfactant Molecules on Melting Behavior in Associating Mixtures of Poly(4-Vinylphenol) and N, N-Dimethyloctadecylamine

Abstract

Melting behavior in associating poly(4-vinylphenol)–N,N-dimethyloctadecylamine mixtures (PVPh-NDOA), which form comb-shaped aggregates, was investigated with various end functionality of the NDOA. Melting temperatures of the comb-shaped aggregates were depressed with slightly decreased end functionality of the surfactant. However, it was found that the repeating unit of PVPh and the dimethylamino group of NDOA formed 1:1 stoichiometric aggregates regardless of the decrement of the end functionality of the NDOA. In addition, it was shown that the excess surfactants, which did not have polar groups on the alkyl chain ends, act only as an impurity for the side-chain crystals of the PVPh-NDOA aggregates.

Keywords:

• Comb-shaped aggregates
• N,N-dimethyloctadecylamine
• Polymer-surfactant mixture
• Poly(4-vinylphenol)

ACKNOWLEDGMENT

We express appreciation to Dr. I. Maruyama of Maruzen Petrochemical Company, Limited, for providing the PVPh samples.