Sustainable bioproducts have become a popular research topic because of their numerous benefits (e.g., sustainable, renewable, environmental-friendly, etc.). Since it is desirable to build a sustainable society based on renewable and sustainable resources, the renewable natural polymers (i.e., cellulose, hemicellulose, lignin, protein, chitosan, etc.) can be considered as future-oriented materials to replace fossil materials. Therefore, it is essential to continue devoting efforts to innovative biotechnology, which may be a gradually accumulating process and a long-term task.

Generally, bioproducts include biocomposites, biofuels, biochemicals, etc. For instance, biocomposites are formed by two or more phases usually derived from organic polymers as the matrix and fibers (from the nano- to macro-scale) as the reinforcement. The strength and stiffness of the fiber materials are much higher than those of the polymer matrix materials and thus the fibers are the major load-bearing component in polymer composites. Biofuels are converted from bioresources/biomass through thermal degradation or microbial fermentation. For instance, hydrothermal processing is a promising technology for converting bioresources/biomass into valuable products or biofuels. In this method, the thermal degradation of biomolecules takes place in water for yielding precious products (e.g., polysaccharides). Those polysaccharides are then further processed into fermentable surges and subsequent biofuels. However, most of the bioproducts are uncompetitive with the commercial products made from fossil resources, which needs intensive research activity for the improvement and development.

This Special Issue is designed to update our state-of-the-art knowledge of sustainable bioproducts derived from renewable natural polymers. Both original research and review articles are welcome. Submissions can talk about the improvements and developments of products and technologies. In particular, we welcome submissions including bioproduct development for advanced applications. Both original research and review articles are welcome.

Potential topics include but are not limited to the following:

• Novel technologies for natural fiber-derived composites
• Utilization of natural proteins for eco-friendly products
• Converting the natural polymers into micro/nanoparticles (e.g., nano-cellulose, nano-lignin, nano-chitosan, etc.)
• Fermentation process for bioethanol, biobutanol, amino acids, etc.
• Pyrolysis/gasification of biomass for valuable products (e.g., biofuels, biogases, biocharcoal, etc.)
• Properties, design, and manufacturing of reinforcing fibers and particles
• Advances in fabrication and processing of composite materials
• Life cycle assessment (LCA) of natural resource-derived products
• Improvement of barrier properties of biocomposite through addition of nanoparticles
• Novel technologies, methods, and applications related to natural polymers