Research on the preparation and properties of polylactic acid and poly(butylene adipate-co-terephthalate)blend

• Main Authors: KUO,YEN-LIN, 郭彥麟
• Other Authors: Chen,Chin-Hsing
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/tqr846

碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 107 === The purpose of this thesis is to study the preparation of polylactic acid (PLA)/polyadipate/butylene terephthalate (PBAT) blend by twin-screw extruder extrusion method, and to explore the processing and properties of the blend. The blend was modified with triacetin (GTA) to test its physical properties, thermal properties, mechanical properties and dynamic mechanical properties. This experiment used polylactic acid (PLA) to add polyadipate/butylene terephthalate (PBAT) to prepare polymer blends by weight percentage (90:10, 80:20, 70:30, 60:40). Different ratios (1phr, 2phr, 3phr) of triacetin (GTA) were added in a weight percent of 70:30. Morphology (FT-IR, SEM, Raman, XRD), physical properties (density, porosity), mechanical properties (hardness, wear resistance index) of different ratios of PBAT and different percentages of GTA to blends were investigated, flexural strength, tensile strength and impact strength), thermal properties (DSC, TGA, TMA, MI and HDT), dynamic mechanical properties (DMA), and the degree of difference in performance. The experimental results show that the XRD, FT-IR and Raman tests show that the characteristic peak of the blend increases with the increase of PBAT content, which can prove the existence of PBAT. Structure and Morphology In the SEM image, the surface structure changed from smooth to wavy surface with the increase of PBAT content. Physical properties were tested. Because the density of PLA and PBAT were similar, the density of the blend was not obvious. Changes; in the mechanical properties test results, the PBAT content increased, and its tensile strength and modulus showed a downward trend, in which the weight percentage (70:30) hardness decreased with the increase of PBAT content, and the wear resistance increased. In the impact resistance test, as the PBAT content increases, the strength increase, among which the weight percentage (70:30) is the best; in the thermal properties, the heat resistance improvement effect is more remarkable. The above results show that the polylactic acid/polyadipate/butylene terephthalate blend has improved heat resistance properties, impact strength, elongation, and abrasion resistance. The addition of GTA to the blend helps to improve the elongation of the material.