Polymers are a group of materials made up of long covalently-bonded molecules, which include plastics and rubbers. The use of polymeric materials is increasing rapidly year by year and in many applications they are replacing conventional materials such as metals, wood and natural fibres such as cotton and wool. The book is designed principally for undergraduate and postgraduate students of Chemistry, Physics, Materials Science and Engineering who are studying polymers. An increasing number of graduates in these disciplines go on to work in polymer-based industries, often with little grounding in Polymer Science and so the book should also be of use to scientists in industry and research who need to learn about the subject. A basic knowledge of mathematics, chemistry and physics is assumed although it has been written to be, as far as is possible, self-contained with most equations fully derived and any assumptions stated. Previous books in this field have tended to be concerned primarily with either polymer chemistry, polymer structure or mechanical properties. An attempt has been made with this book to fuse together these different aspects into one volume so that the reader has these different areas included in one book and so can appreciate the relationships that exist between the different aspects of the subject. Problems have also been given at the end of each chapter so that the reader may be able to test his or her understanding of the subject and practise the manipulation of data.