Macromolecular compounds. Communication 61. Reaction of polyester macromolecules

Abstract

1. A study has been made of- reactions in three mixtures, each containing two polyesters having different and groups. Three polyester components, having carboxyl, hydroxyl, and ethoxyl end groups respectively, are used. 2. It has been found that the polyester having hydroxyl end groups.reacts with the polyesters having carboxyl and ethoxyl end groups. 3. It has been found that the polyester having carboxyl end groups does not react with the polyester having ethoxyl end groups. 4. It has been shown that a decisive factor for the occurrence of polycondensation is the volatility of the low-molecular-weight product that separates: high volatility leads to a displacement of the equilibrium to the right and so to the growth of the polymer molecules. 5. It has been shown that macromolecules have fairly high reactivities, so that they are capable of undergoing the same reactions as the monomers are.