Orientation of polymers together with low molecular organic substances

Abstract

Binary oriented containing polymers and low molecular organic substances have been prepared. The specimens examined were mixtures of oriented crystals of both components forming two independent textures with a single axis. One texture consists of polymeric crystallites, and the other of crystals of the low molecular substance. The polymeric crystals invariably formed axial textures. The crystals of the low molecular component could be oriented in the form of either axial or planar textures. Binary textures are obtainable with mixtures of fixed compositions by press moulding at T pm above the melting point of the polymer. Oriented systems were obtained for the following pairs: ferrocene-PE, anthracene-PE, ferrocene-POE, ε-caprolactam-POE, naphthalene-POE, ferrocene-POM and anthracene-PP. In the case of dicyanodiamide-PE, pentaerithrite-PE, urea-PE, pentaerithrite-POE, urea-POE and hydroquinone-PE orientation of the low-molecular component could not be obtained at the same time as orientation of the polymer. On analysing the thermal behaviour of the mixed components it was found that coorientation takes place in pairs where the low molecular component dissolves in the polymer melt, after which both components crystallize simultaneously while cooling, though the components crystallize independently of one another.