The Preparation and the Properties of Ag Nanoparticles/Sodium Alginate/Polyvinyl Alcohol Composite Films

• Main Authors: HE,JHAO-YI, 何昭儀
• Other Authors: Lin,Chin-An
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/49989404196072435217

碩士 === 逢甲大學 === 纖維與複合材料學系 === 102 === This study is divided into three parts. The first part is the preparation of sodium alginate /polyvinyl alcohol composite films. After the solution with 3 wt% sodium alginate and 15 wt% polyvinyl alcohol was mixed. The FT-IR and VVSEM show there are only hydrogen bond and a good compatibility. The mechanical properties showed SAP82 have the best strength at break 46.8 MPa and it increase 324%. From TGA, the decomposition temperature of films increased from 248.46 ℃to 265.22 ℃with increasing PVA content. The second part is the preparation of the nano silver /sodium alginate film. We use of 3 wt% sodium alginate as a protective agent, silver nitrate as silver nanoparticles reduction by using oxidation-reduction methods in the sodium alginate solution, then obtained the nano silver/ sodium alginate films. By UV-vis, EDS, TEM, SPSA, VVSEM analysis confirmed the presence of nano-silver having an average particle size of all less than 100 nm, The mechanical properties and antibacterial analysis showed Ag1000SA have the best strength at break 80.37 MPa and it increase 180%, and have a degree of antibacterial effect. The rheological analysis results display that with increasing shear rate and temperature, the apparent viscosity of the solution fall. And with nano-Ag content had increased Non-Newton index will decrease first and then increased. The third part is the preparation of the best ratio of nano silver in second part / sodium alginate / polyvinyl alcohol composite film. By adding polyvinyl alcohol, investigate the effect of different amounts of nano silver / sodium alginate / polyvinyl alcohol films. From UV-vis, VVSEM contain silver nanoparticles and particle size are smaller than 100 nm, remained nanoscale. The mechanical properties showed the strength at break of samples containing the best ratio of the silver nanoparticles are better than non-contained samples. With the increase in the proportion of polyvinyl alcohol, to improve the elongation at break 657%.