1. History of Fiber Structure

The early history of fiber structure in molecular level is closely related to the history of development of the so-called macromolecular theory or the concept of macromolecules. After a long debate, it ended in victory of the macromolecular theory in 1936, concluding that the substances consist of many monomers connected by covalent bonds. Through the discussions of the macromolecular theory, the study of fiber structure was greatly activated. In this article we review the history of fiber structure. In the first section we describe the research history of structure of natural fibers, especially natural cellulose fiber, starting from a micelle model to a fringed-micelle model. In the second section, we focus on the history of the structural study of synthetic fibers from fringed-micelle microfibril model to shish-kebab model.