- 學位論文
不同聚合單元體成分對於聚對苯二甲酸二元酸丁二酯之物性、機械強度與分解性之影響
The physical, mechanical and degradable properties of Poly(butylene sba-co-terephthalate）of various monomer compositions
摘要
本研究以二元酸（SbA）、二元酯（DMT）、二元醇（BDO）等單體藉由轉酯化反應（Transesterification）及聚縮合反應（Polycondensation）合成聚對苯二甲酸二元酸丁二酯Poly(butylene sba-co-terephthalate, PBSbT）。本實驗分為三個部份，第一部份於實驗過程中探討聚縮合溫度、催化劑（Ti(Obu)4）濃度、二元醇對應二元酸總莫耳數添加比例對所合成之PBSbT聚酯之本質黏度（Intrinsic viscosity, [η]）之影響。由實驗結果發現，當聚縮合溫度為260℃、催化劑濃度為0.97mmol/mol、二元醇濃度BDO/(SbA+DMT)＝1.2 mol/mol、二元酸單體比例為SbA/(SbA+DMT)＝50 mol%，聚縮合反應時間1小時，PBSbT之[η]達0.46 dL/g為最佳。第二部份於實驗過程中探討不同SbA單體莫耳百分比變動對PBSbT聚酯之本質黏度及熱性質及機械性質之影響。由實驗結果發現，熱性質方面，當單體莫耳百分比SbA/(SbA+DMT)=30 mol%時，共聚酯之熔點為最高，可達174℃。在機械強度方面，共聚酯之最大拉伸強度（Tensile strength）以SbA/(SbA+DMT)=30 mol%時可達20.2MPa；共聚酯之最大延伸率（Elongation）以SbA/(SbA+DMT)=50 mol%時可達105.1%；共聚酯之楊氏模數（Young modulus）以SbA/(SbA+DMT)=30 mol%時可達532.9MPa。第三部份於實驗過程中探討酵素系統與堆肥系統之生物分解率。由實驗結果發現，隨著SbA/(SbA+DMT)比例增加，其所測得生物分解的速率越快，其中以SbA/(SbA+DMT)=70 mol%為最快，在酵素系統中20天時可達100%；在堆肥系統中60天可達48%。
並列摘要
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%.