Functional Group Reactivity in Polymer Science The Chemistry of Azo Functional Group Introduction Methods of Preparation Characterization Structural Chemistry Properties of Azo Functional Group Conclusion References Azo Functional Polymers-Strategies for Synthesis Introduction Aliphatic Azo Polymers Aromatic Azo Polymers Conclusion References Thermal Chemistry of Azo Functional Polymers Introduction Thermolabile Polymers: A Radical View Heat Resistant Polymers Conclusion References Photochemistry of Azo Functional Polymers Introduction Photochemistry of Azobenzene: CisTrans Isomerism Macromolecular Photochemistry Conclusion References Biodegradation of Azo Functional Polymers Introduction Bacterial Azo Reduction Bacterial Reduction of Polymeric Azo Dyes Design of Biodegradable Aromatic Azo Linkage Types of Biodegradable Drug Delivery Systems Azo Polymers as Chemical Carriers: Degradable Side Chains Azo Polymers as P hysical Carriers Polymers of Controlled Lifetime Conclusion References Miscellaneous Specialty Properties of Azo Functional Polymers Introduction Polymeric Azo Dyes Liquid Crystalline Polymers: Made to Order Polymers with Non-Linear Optical Effect Conducting Polymers Conclusion References