What are some of the key considerations when designing bioplastic composites for use in engineering applications, and how do they differ from traditional composite materials? How do the properties of the bioplastic matrix, as well as the type and morphology of the reinforcing fibers, impact the performance of the composite? Additionally, what are some challenges associated with the production and processing of bioplastic composites, and how might these challenges be addressed using chemical engineering principles? Finally, what are some emerging trends in the development of bioplastic composites, and how might they impact the future of sustainable materials engineering?