Enhanced Phase Morphology of Polyester/Polyolefin Blends by In-situ Reactive Compatibilization.

摘要

Polymer blending is one of the most attractive methods to develop new materials with a useful property balance [1-3]. However, the rule of mixtures (which predicts that blend properties will be the average of their ingredients) generally does not hold in polymer blends because the blend components are usually immiscible. Hence, the basic requirement for the development of a useful set of properties through blending is compatibilization of the immiscible constituents. By applying a compatibilization method, the interfacial properties of an immiscible polymer blend are suitably modified, such that desired morphologies and properties are obtained. The two methods of compatibilization that have found practical application are (i) incorporation of a separate chemical compatibilizer such as non- reactive graft or block copolymers into an immiscible polymer blend during melt compounding [4] and (ii) reactive compounding to form in situ a compatibilizer [5]. The reactive compounding technique utilizes a copolymer containing functional groups that are able to react with one (or more) of the blend components to form graft or block copolymers during melt blending. These in situ-formed compatibilizers are believed to interact with the component polymers of the blends, reducing the interfacial tension, enhancing the interfacial adhesion, and stabilizing the domain structure.