**Preface**

With increasing concern regarding the undesirable environmental and socioeconomic consequences of petrochemicals and limited fossil resources, biomass, bio-based polymers, and other renewable natural resources have increasingly become alternatives for the production of functional materials. Natural biomass, such as wood, bamboo, rattan, cellulose, bacterial cellulose, lignin, hemicellulose, chitin, alginate, silk, fibroin, starch, protein, collagen, gelatin, natural rubber, and their modified derivatives/composites, has been widely consumed for the preparation of bioplastics/biorubber in the form of film/member/hydrogel/foam/aerogels/fibers for various applications. Biobased synthetic polymers such as polyester, PLA, PHA, PBAT, PC, PBS, polyurethane, and so on can be derived from a variety of molecular biomasses such as straw glucose, plant oils, fatty acids, furan, terpenes, rosin acids, and amino acids. The use of such environmentally friendly or "green" polymer materials can avoid dependence on petroleum resources and reduce carbon emissions. Additionally,green solvent/process/technology for polymers and polymers for capturing pollution also contribute to the aim of global green and low-carbon transformation.

The presented reprint contains 30 high-quality original research and review papers by 202 authors from various research centers, including China, the USA, Australia, France, Brazil, Saudi Arabia, Thailand, and Indonesia. These papers were published in a Special Issue, "Eco Polymeric Materials and Natural Polymers", of the journal *Polymers*. These papers provide examples of the most recent developments in eco-polymeric materials and natural polymers. The Guest Editors would like to thank all authors who contributed to this Special Issue. The Guest Editors would also like to thank Special Issue Editor Jenny Hu for her overall professional attitude and kind assistance with the publications.

> **Jingpeng Li, Yun Lu, and Huiqing Wang** *Editors*
