Preparation and Characterization of Novel Nanocellulose/PLA Composites Via Aerogel Procedures

作     者：Elmira Zarei 

作者单位：浙江大学 

学位级别：硕士

导师姓名：盛奎川

授予年度：2016年

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主      题：nanofibrillated cellulose microfibrillated cellulose nanocellulose/PLA composite poly(lactic acid) freeze-drying 

摘      要：At present there is significant interest for the development of environmentally friendly polymers and polymer based composites from renewable resources. Worries about greenhouse gas emissions produced by using fossil fuel composed with low degradability of polymers derived from fossil fuel has led to increase in research to develop degradable polymers and composites. Poly(lactic acid) and cellulose are two such examples of degradable polymers that come from renewable *** production of nanocellulose with controlled structure from plant resources with facile availability and well sustainability in purpose of application of suitable material for various biomedical applications and energy storage devices is very important in science and engineering. Up to now, many methods for isolating nanocellulose from various plant fibers such as mechanical and chemical procedures had been explored. Furthermore, in recent years, natural fiber reinforced biopolymer nanobiocomposites have attracted great interest, both in academia and industry. In this case, the most important factor in obtaining good fiber reinforcement in the composite is the strength of adhesion between the matrix polymer and the fiber which can be effect on their properties. Whereas the main drawbacks of natural fiber reinforced polymer composites are their hydrophilicity, low weathering resistance that adversely affect the fiber/matrix interface and leads to degradation, and delamination of composites. Since, fibers are hydrophilic in nature, therefore, are inherently incompatible with many well-known and popular in composite manufacturing resins such as PLA. Overall, the main objective is to develop an understanding for relationships between processing, different kinds of material, different concentration of PLA to produce nano/micro cellulose composites and properties of the resulting materials in order to assess the potential of these new nontoxicity, biocompatibility, and biodegradability materials.