This book explains general concepts of an important engineering thermoplastic polymer—polytrimethylene terephthalate (PTT). It describes preparation methods, characterization techniques, and various applications of PTT-based blends, IPNs, and composites. It also gives a clear idea about the engineering thermoplastic, PTT, and its importance in future. In addition to the basic concepts of PTT-based materials, the book also includes novel studies and issues on this topic. This book is an outcome of contributions by experts from different disciplines with various backgrounds and expertise. This book is useful for professionals, researchers, industrial practitioners, graduate students, and senior undergraduates of polymer science and engineering. Additionally, it is also beneficial for researchers working on materials science, surface science, bioengineering, chemical engineering, and nanomaterials. This book helps the researchers and students in expanding their knowledge in this field.