Solution Properties Crystallinity And Morphology Studies Of Aromatic Polyamide And Its Block Copolymers PDF Download

The development of high levels of chain orientation and tensile strength in fibers obtained from the wet spinning of liquid crystalline aromatic polyamide solutions has gained increased attention in recent years. Various other synthetic polymer systems have been found to exhibit liquid crystalline behavior including polypeptides, certain polyester copolymers, some vinyl polymers and p-linked aromatic polyamide-hydrazides. Various biological polymers such as RNA and DNA have been so identified as well as one modified cellulose. While various investigators have presented studies of the characteristics of individual polymer liquid crystalline systems, there have been no comparative studies of a series of polymer liquid crystalline systems nor detailed comparisons with the well known low molecular weight thermotropic liquid crystalline compounds. Furthermore, since the various systems were studied by different research groups often using different experimental methods, both the relative characteristics and peculiar features of individual systems have not been clearly identified. The purpose of the present paper is to present such a needed comparative study.