Extraction Processing

Download Biodegradable Poly(Lactic Acid): Synthesis, Modification, by Jie Ren PDF

By Jie Ren

"Biodegradable Poly (Lactic Acid): Synthesis, amendment, Processing and functions" describes the guidance, amendment, processing, and the study and functions of biodegradable poly (lactic acid), which belong to the biomedical and environment-friendly fabrics. hugely illustrated, the publication introduces systematically the synthesis, actual and chemical transformations, and the newest advancements of analysis and functions of poly (lactic acid) in biomedical materials.

The e-book is meant for researchers and graduate scholars within the fields of fabrics technology and engineering, polymer technological know-how and engineering, biomedicine, chemistry, environmental sciences, fabric technology and engineering, package deal fabrics, and so on.

Dr. Jie Ren is a professor on the Institute of Nano and Bio-Polymeric fabrics, institution of fabric technology and Engineering, Tongji collage, Shanghai, China.

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Extra info for Biodegradable Poly(Lactic Acid): Synthesis, Modification, Processing and Applications

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Also, it is hard to remove solvent completely from the end product. Meanwhile, the azeotropic dehydrative condensation process inherits the 22 3 Synthesis and Manufacture of PLA problems with involvement of organic solvents which makes the processes ecologically unattractive. 3 Polycondensation Kinetics of LA Harshe et al. [27] developed a dynamic model for the polycondensation of LA accounting for water removal by diffusion. The model and the corresponding parameter values were validated by comparing the model simulation results with the experimental results.

69, 203 (1993). , Kohn D. H. 1 Polym. , Part A: Polym. , 31, 1221 (1993). , Toshima K. Macromoi. , 18,477 (1997). , Toshima K. Macromoi. , 130,285 (1998). , Toshima K. Int. J. BioI. , 25, 161 (1999). , et ai. Sen-i. , 62, 63 (2006). , Srivastava R. , Finne-Wistrand A, et ai. Biomacromo1ecules, 8, 3115 (2007). 37 4 Modification of PLA Abstract PLA widely used in many fields has gained enormous attention because of its biodegradable and biocompatible properties. However, unitary structure and poor properties of PLA such as the inherent brittleness, poor melt strength, low heat deflection temperature (HDT), narrow processing window and low thermal stability have posed considerable scientific challenges and limited their large-scale applications.

Wang et al. [25] have synthesized the functional PLA with hydroxyl side groups and poly (lactic acid-co-~-maleic acid) pendant hydroxyl arms (PLMAHE), and reported that the pendant hydroxyl arms could improve the affinity of the polymer to cells (EVC-304) and that cells grown on the polymer with 10% functional monomer displayed the best morphology. Furthermore, they derived this PLMAHE to a new PLMA-based copolymer with extended carboxyl arms (PLMA-ECA) (Fig. 3), which have an interval arm between the carboxyl group and the PLMA main chain.

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