This new volume explores the foundation of macromolecular science along with the field's current challenges and solutions to challenges. The book discusses many new applications that have emerged recently based on different polymers and their composites, inlcuding some on the application of polymer composite in electromagnetic interference (EMI) shielding, sensing, and wound healing. This book discusses innovations in the synthesis and characterization of many different classes of polymers and provides in-depth explanations of the behavior of polymers in solutions and in bulk. It considers the synthesis, characterization properties, and applications of many polymer composites and nanomaterials. The diverse topics cover zein-based composites, nanocellulose extracted as a potential filler for polymers, polymers to strengthen concrete, polymer/metal nanocomposite magnetic materials, synthetic polymers in aquatic environments, pharmaceutical 3D-printing, alginate-based wound healing dressings, and more. Many chapters in the volume place emphasis on sustainable development and green eco-friendly approaches. This volume will help researchers to understand the significance of macromolecular science and research advances for sustainable development for the benefit of humanity. It emphasizes the many roles of macromolecular science in the important fields of science, such as chemistry, physics, engineering, biology, pharmaceutical science, and more.