The Fifth Edition of Principles of Polymer Systems has been completely revised and updated. The chemical engineering perspective has been retained and strengthened, and the broad applications of polymers in chemistry and materials science have been addressed. The theoretical basis for various topics has been deepened and strengthened and several new topics are addressed. These changes reflect the rapidly growing recognition by all scientists and engineers of the role polymers play in industry. Electronics and medicine are representative areas that require more than a passing knowledge of macromolecular principles. Both areas receive attention in this edition. The end-of-chapter problems in the book have been completely replaced with the new problems. A solutions manual will be available to qualified instructors.