Polybenzoxazine is a novel class of thermosetting material that belongs to the family of addition-curable phenolic resins. It is a promising high temperature polymer in view of its outstanding thermal, physical, and mechanical properties that are beneficial for their application in aerospace and microelectronics industries. The first objective of this book is to provide the reader with information on the developments and properties of contemporary thermosetting polymers, along with the chemistry and curing kinetics of polybenzoxazines. The unique properties of polybenzoxazines originate from t.