tailieunhanh - sự phát triển của vật liệu phân hủy sinh học nanocomposite

Vật Liệu Cao Cấp: từ Composite đến Nanocomposite . Composite là hỗn hợp của ít nhất hai vật liệu khác nhau bổ sung cho nhau. Vì là loại sợi thuộc họ amid, Kevlar dễ bị phân hủy khi với gặp nước hoặc thoái hóa khi | J. Ind. Eng. Chem Vol. 13 No. 4 2007 485-500 REVIEW Progress in Nanocomposite of Biodegradable Polymer Ke-Ke Yang Xiu-Li Wang and Yu-Zhong Wang f Center for Degradable and Flame-Retardant Polymeric Materials College of Chemistry Sichuan University Chengdu 610064 People s Republic of China Received May 10 2007 Accepted May 18 2007 Abstract This paper reviews recent developments related to biodegradable polymer nanocomposites. The preparation characterization properties and applications of nanocomposites based on biodegradable polymers are introduced systemically. The related biodegradable polymers include aliphatic polyesters such as polylactide PLA poly s-caprolactone PCL poly p-dioxanone PPDO poly butylenes succinate PBS poly hydroxyalkanoate s such as poly j-hydroxy butyrate PHB poly 3-hydroxybutyrate-co-3-hydroxyvalerate PHBV and natural renewable polymers such as starch cellulose chitin chitosan lignin and proteins. The nanoparticles that have been also utilized to fabricate the nanocomposites include inorganic organic and metal particles such as clays nanotubes magnetites Au and Ag hydroxyapatite cellulose chitin whiskers and lignin. Keywords biodegradable material nanocomposite aliphatic polyester poly hydroxyalkanoate natural renewable polymer Introduction In the past century various synthetic polymer materials have been developed in different forms such as plastics fibers and synthetic rubbers and used widely in a variety of fields including packaging construction materials agriculture and medical devices. Undoubtedly those synthetic polymer materials perform very important roles in our daily lives. After rapid development for several decades a Gordian knot is becoming increasingly serious the continual environmental pollution caused by un-degradable synthetic polymer wastes. Recycling present polymer wastes is a direct and popular approach toward solving this problem. However developing and using biodegradable polymers is considered as the most thorough .