Dissertation > Excellent graduate degree dissertation topics show

Preparation and Properties of Starch Nanocrystals/Natural Polymer Composite Films

Author: DuanBin
Tutor: YangCheng
School: Jiangnan University
Course: Materials Science
Keywords: Starch nanocrystals Soybean protein isolate Carboxymethyl chitosan Composite film
CLC: TB383.2
Type: Master's thesis
Year: 2008
Downloads: 212
Quote: 2
Read: Download Dissertation

Abstract


Polymer-matrix nanocomposites, as an important part in nanotechnology field, are developing rapidly and have potential applications. Especially, the technology of nano-particles prepared from natural polymer opens a new research direction for nanocomposites. In this thesis, the starch nanocrystals were prepared from natural starch. Then, the environment-friendly starch nanocrystals/soybean protein isolate(SPI) and starch nanocrystals/Carboxymethyl chitosan (CM-CH) composite films were prepared by solution blend method. The structures and properties of the nano-composite were studied.Starch nanocrystals were prepared by sulfuric acid hydrolysis of waxy maize amylopectin. The remaining starch granules after acid hydrolysis were characterized by X-ray diffraction(XRD) and Transmission electron microscopy (TEM). The results indicated that the crystallinity of granules increases and the crystallite size and interplanar spacing decrease with the increasing of acid hydrolysis time. Starch nanocrystals with size between 40nm to 100nm and crystallinity of 62.97% were obtained after 6 days of hydrolysis. The yield of starch nanocrystals is about 24.1wt%.The Starch Nanocrystals/Soybean Protein Isolate(SPI) composite films filled with different content of starch nanocrystals were prepared by solution blend method, and their properties were studied, the results showed that when the content of starch nanocrystals was lower, they had a better improvement and reinforcement function for properties of the composite films, such as the mechanical properties and barrier properties.The FT-IR analysis of composite films suggested there was strong interaction between the nanocrytal and SPI. When the starch nanocrystals content was 20wt%, the tensile strength(TS) of composite films increased by 7 times, elongation at break(EB) is 70.6%. The films’hygroscopicity and Water Vapor Permeation ratio reduced to the lowest and displayed good barrier properties.Starch Nanocrystals/Carboxymethyl Chitosan composite films were prepared. The structure of composite films was characterized by FT-IR, XRD and SEM. The results indicated there was strong interaction and good compatibility between starch nanocrystals and carboxymethyl chitosan in composite films. The transmittance of composite films decreased with the increasing of starch nanocrystals content, while the starch nanocrystals content was 40wt%, the transmittance decreased to the minimum value 69.3%. The mechanical properties of composite films were improved with filled proper starch nanocrystals. When the starch nanocrystals content was 30wt%, the tensile strength(TS) of composite films approached 28.8MPa, which was the two times higher than that of the carboxymethyl chitosan film without filling starch nanocrystals, and the elongation at break(EB%) of composite films was 92.4%, that indicated composites films had a good extensibility. The barrier properties of composite films were improved with the increasing of starch nanocrystals content.

Related Dissertations

  1. Studies on Chitosan and Its Derivatives Adsorption for Paralytic Shellfish Poisoning in Ostrea Rivularis Could,TS254.4
  2. Study on the Accumulation and Remove of Cadmium and Lead in Oysters,X174
  3. The Preparation and the Properties of the Composite Films from Cassava Starch and Guar Gum,TS236.9
  4. Bovine serum albumin and protamine from NOCC / alginate hydrogels release : the isoelectric point of two different biological molecules controlled trial,R943
  5. Study on the Hemostatic Effect of Carboxymethly Chitosan and its Safety in the Blood System Evaluation,R318.08
  6. Multicomponent gradient composition of rigid composite film cutter,TG71
  7. Multi-block type sulfonated poly ether sulfone proton exchange membrane preparation and properties of,TM911.4
  8. The Study on the Preparation and Quality Standard of Anti-Inflammatory Dental Ulcer Filmogen,TQ463
  9. Properties and Preparation of GSH-sensitive Polymeric Prodrug: 6-Mercaptopurine-Carboxymethyl Chitosan,TQ463.2
  10. Cytotoxicity of Carboxymethyl-chitosan Calcium on Osteoblasts in Vitro,R318.08
  11. Study on the Process Technique of Whey Protein Based Films and Antimicrobia Properties of the Composite Films,TS201.21
  12. Preparation and Characterization on Ionic Liquid 1-Buty-3-Methylimidazolium Hexafluorophosphate and the New Anhydrous Conducting Membranes Based on Polymers of Sulfonated Poly (Ether Ether) Ketone and Polyvinylidenefluoride,O626.23
  13. Preparation of Carboxymethyl Chitosan Thermosensitive Hydrogel and Study on Its Biocompatibility,R318.08
  14. Effect of Chitosan Oligosaccharide Derivatives on Cadmium Content in Pacific Oyster,X174
  15. Preparation and Drug Loading Property of Magnetic MnFe2O4/Carboxymethyl Chitosan Composite Microspheres,TB383.1
  16. Preparation and Photoelectric Performance of Graphene/TiO2 Composite Films,TB383.2
  17. Carboxymethylichitosan Coated Proliposomes Containing Coix Seed Oil: Preparation, Characterization, Stability and in Vitro Release Evaluation,TQ461
  18. The Application of Attapulgite Clay Modified Electrode in the Electrochemical Sensors,TP212.2
  19. Investigation on Modified Nafion Proton Exchange Membrane for PEMFC,TM911.4
  20. Proton exchange membrane fuel cell synthesis and properties of,TM911.4
  21. ZnO composite film as the cathode of lithium-ion batteries,TM912

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile