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URN etd-0705110-202646 Statistics This thesis had been viewed 3645 times. Download 1252 times. Author Chia-Cheng Chang Author's Email Address No Public. Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 111 Title Effect of Sebacic Acid Modification and Titanate Coupling Agent Treated Calcium Carbonate on the Properties of Thermoplastic Starch Keyword Tensile Dispersion Coupling agent treated calcium carbonate (LTCC) Sebacic acid (SA) Thermoplastic starch (TPS) Thermoplastic starch (TPS) Sebacic acid (SA) Coupling agent treated calcium carbonate (LTCC) Dispersion Tensile Abstract In this study, the sebacic acid (SA) modified tapioca starch (SATPS) was blended with coupling agent, Lica12, treated calcium carbonate (LTCC) to prepare a new thermoplastic starch (TPS). This investigation was divided into three parts.
In section 1, the TPS materials that modified tapioca starch with different concentrations of SA (SATPS) were prepared by single-screw extruder. The X-ray diffraction (XRD) analysis could be found that the crystal structure of tapioca starch was transforms from the CA-type structure of native starch to the unstable VH-type structure of TPS after processing. And then, the tapioca starch was modified by SA, the VH-type structure of TPS became more stable. The FT-IR patterns indicated that the characteristic peak of C=O in ester was observed at 1732 cm-1. It was proved that SA not only was reacted with glycerol by esterification, but also could be absorbed on starch molecules, and then the plasticization of SATPS blends were improved during extrusion. The SEM morphology could found that the structure of residues starch granules became more larger with increasing SA concentration. The stress-strain test shown that the elongation at break of 0.1MSATPS could increase from 225% to 380%.
The Section 2, the TPS materials that modified tapioca starch with various contents of LTCC were prepared by single-screw extruder. The X-ray patterns indicated that the VH-type crystallinity of TPS was decreased and accompanied with appearing of CaCO3 crystalline. The FT-IR patterns could be found that the
characteristic peak at 1647 cm-1 was δ-OH of absorbed water by starch and the peak intensity was decreased with increasing LTCC content. SEM surface morphology observed that LTCC particle was dispersion in the thermoplastic starch matrix. The stress-strain test could found that the elongation at break in LTCC content of 15 phr was increased from 225 % to 350 %.
The section 3, the 0.1MSATPS/LTCC composites with various contents of LTCC were prepared by single-screw extruder. The XRD pattern shows that the VH-type structure of 0.1MSATPS of the 0.1MSATPS/LTCC was decreased with increasing LTCC content. The FT-IR patterns indicated that the characteristic peaks of C=O at 1732 cm-1 in ester, and the δ-OH band belongs of absorbed water at 1647 cm-1 was decreased gradually. SEM morphology shows that the compatibility of SATPS with LTCC was better than that of un-modified TPS. Therefore, while the tensile stress of 0.1MSATPS/LTCC with LTCC content of 5 phr was increased from 2.5 MPa to 5.0 MPa, and the elongation at break was 250 %.
Advisor Committee Chi-Yuan Huang - advisor
Kan-Nan Chen - co-chair
none - co-chair
none - co-chair
none - co-chair
Wen-Yen Chiang - co-chair
Files Date of Defense 2010-06-16 Date of Submission 2010-07-06