1. IntroductionWith the continuous improvement of living standards and rapiddevelopment of industrial technology, people have more and moredemands for high-performance or functional materials. But most natural polymers cannot meet the application requirements inmany industries and fields due to their structure and performancelimitations. Therefore, large amounts of chemically synthesizedpolymers were developed and applied to satisfy the needs of socialdevelopment. However, most chemical materials are difficult tobiodegrade, causing serious environmental pollution. A large number of by-products harmful to human body and natural environment will also be produced during the preparation of thesesynthetic materials. In order to protect the living environment ofhuman beings, biomass materials derived from natural substancehave become the research focus in various fields [1,2].