| Summary: | 碩士 === 大同大學 === 生物工程學系(所) === 99 === In this study, a series of Poly(butylene sba-co-terephthalate, PBSbT） of various monomer compositions were synthesized from SbA, DMT, and BDO in the presence of Ti(Obu)4 by transesterification and polycondensation. The experimental design was divided into three parts. The first part was the investigation of polycondensation under various temperatures, molar ratios of BDO/(SbA+DMT), and catalyst concentrations of Ti(Obu)4, on the intrinsic viscosity （[η]）. Our results showed the best polycondensation occurred at 1 hr with [η] reaching 0.46 dL/g when the temperature was held at 260 °C, BDO/(SbA+DMT) = 1.2 mol/mol, and 0.97 mmol/mol （SbA+DMT） of Ti(Obu)4 with SbA/(SbA+DMT) = 50 mol%. The second part of the experiment involves searching for the best molar ratio of SbA/(SbA+DMT) in obtaining desirable polymer properties. The results showed that the highest melting point of PBSbT can be as high as 174 °C at SbA/(SbA+DMT) = 30 mol%. The maximum tensile strength of 20.2 MPa is obtained at SbA/(SbA+DMT) = 30 mol%. The maximum elongation at break of 105.1% and the maximum Young's modulus of 532.9 MPa was reached at SbA/(SbA+DMT) = 50 mol% for the former and at SbA/(SbA+DMT) = 30mol% for the latter. The third part of the experiment involved a lipase-degradation system and a compost-degradation system. The results showed that the fastest lipase-decomposition rate of PBSbT reached 100 % at 20 days and a compost-decomposition rate reached 48% at 60 days for samples with molar ratio SbA/(SbA+DMT)= 70 mol%.
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