| Summary: | 碩士 === 大同大學 === 生物工程學系(所) === 98 === In this study, a series of aliphatic-aromatic coplyesters of poly(butylene adipate-co-butylene terephthalate) (PBAT) was prepared from adipic acid (AA), dimethyl terephthalate (DMT), and 1,4-butanediol(BDO) by catalyzed transesterification. The experiment investigated the different temperature of polycondensation, molar ratio of BDO/(AA+DMT), and AA/(AA+DMT) on the physical and lipase-degradable properties of PBAT. The first part of experiment investigated the effects of different temperature and molar ratio of BDO/(AA+DMT). The results showed the best polycondensation for high [η] (0.6 dL/g), proper melting point (145.5 ℃), high decomposition point (368.6 ℃) and proper crystallinity (15.2 %) reached at temperature of 260 ℃, BDO/(AA+DMT) = 1.2 mol/mol with AA/(AA+DMT) = 50 mol%, and 0.97 mmol/mol (AA+DMT) of tetrabutyl titanate (Ti(Obu)4). The second part of experiment investigated the best molar percentage of AA/(AA+DMT) for the polymer properties and biodegradability. The results shown that Tm, Td and crystallinity up to 179.3 ℃ , 373.5 ℃ and 40.8 % respectively at AA/(AA+DMT) = 30 mol%. The maximum tensile strength of 20.1 MPa was reached at AA/(AA+DMT) = 30 mol%. The maximum elongation at break of 150 % reached at AA/(AA+DMT) = 50 mol%. The maximum Young's modulus of 608.6 MPa reached at AA/(AA+DMT) = 30 mol%. The fastest lipase-decomposition rate of PBAT reached 100 % at 2 weeks for samples of molar ratio AA/(AA+DMT) = 70 mol%.
|
|---|
