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采用溶剂成膜法制备了柠檬酸三乙酯(TEC)、大豆油和甘油三乙酸酯增塑的聚(3-羟基丁酸酯-co-4-羟基丁酸酯)共混物,考察了增塑剂的种类及其用量对共混物热学和力学性能的影响。用差示扫描量热仪(DSC)和电子拉力试验机分别测定共混物的热性能和力学性能。结果表明,三种增塑剂中质量分数为5%的TEC对共聚物的增塑改性效果较好,与纯聚酯相比共混物的结晶温度(Tmc)下降了2.0℃,结晶焓(ΔHmc)基本保持不变。当TEC的质量分数为20%时,聚(3-羟基丁酸酯-co-4-羟基丁酸酯)的Tg下降21℃。TEC共混物能保持15.8MPa的拉伸强度和588%的断裂伸长率。
Poly (3-hydroxybutyrate-co-4-hydroxybutyrate) blends plasticized with triethyl citrate (TEC), soybean oil and glycerol triacetate were prepared by solvate method. The influence of plasticizer type and amount on the thermal and mechanical properties of blends was studied. The thermal and mechanical properties of blends were determined by differential scanning calorimetry (DSC) and electronic tensile testing machine respectively. The results showed that 5% TEC of the three plasticizers had good plasticizing effect on the copolymer. Compared with the pure polyester, the Tmc of the copolymer decreased by 2.0 ℃, the enthalpy of crystallization (ΔHmc) remains basically unchanged. When the mass fraction of TEC is 20%, the Tg of poly (3-hydroxybutyrate-co-4-hydroxybutyrate) is decreased by 21 ° C. The TEC blend maintained a tensile strength of 15.8 MPa and an elongation at break of 588%.