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Abstract：
To solve the decrease in the crystallization, mechanical and thermal properties of recycled polyethylene terephthalate (rPET) during mechanical recycling, the aromatic amide fatty acid salt nucleating agents Na-4-ClBeAmBe, Na-4-ClBeAmGl and Na-4-ClAcAmBe were synthesized and the rPET/nucleating agent blend was prepared by melting blending. The molecular structure, the thermal stability, the microstructure and the crystal structure of the nucleating agent were characterized in detail. The differential scanning calorimetry (DSC) result indicated that the addition of the nucleating agent improved the crystallization temperature and accelerated the crystallization rate of the rPET. The nucleation efficiencies (NE) of the Na-4-ClBeAmBe, Na-4-ClBeAmGl and Na-4-ClAcAmBe were increased by 87.2%, 87.3% and 41.7% compared with rPET which indicated that Na-4-ClBeAmBe and Na-4-ClBeAmGl, with their long-strip microstructures, were more conducive to promoting the nucleation of rPET. The equilibrium melting points (Tm0) of rPET/Na-4-ClBeAmBe, rPET/Na-4-ClBeAmGl and rPET/Na-4-ClAcAmBe were increased by 11.7 °C, 18.6 °C and 1.9 °C compared with rPET, which illustrated that the lower mismatch rate between rPET and Na-4-ClBeAmGl (0.8% in b-axis) caused Na-4-ClBeAmGl to be the most capable in inducing the epitaxial crystallization and orient growth along the b-axis direction of the rPET. The small angle X-ray diffraction (SAXS) result proved this conclusion. Meanwhile, the addition of Na-4-ClBeAmGl caused the clearest increase in the rPET of its flexural strength and heat-distortion temperature (HDT) at 20.4% and 46.7%.
摘要：
为了解决结晶的减少，机械回收过程中回收的聚对苯二甲酸乙二醇酯（rPET）的机械和热性能，芳香族酰胺脂肪酸盐成核剂Na-4-ClBeAmBe，合成了Na-4-ClBeAmGl和Na-4-ClAcAmBe，并通过熔融共混法制备了rPET/成核剂共混物。分子结构,热稳定性，详细表征了成核剂的微观结构和晶体结构。差示扫描量热法（DSC）结果表明，成核剂的加入提高了rPET的结晶温度，加快了结晶速率。Na-4-ClBeAmBe的成核效率（NE），Na-4-ClBeAmGl和Na-4-ClAcAmBe增加了87.2%,与rPET相比，分别为87.3%和41.7%，表明Na-4-ClBeAmBe和Na-4-ClBeAmGl，它们的长条微结构，更有利于促进rPET的成核。rPET/Na-4-ClBeAmBe的平衡熔点(Tm0),rPET/Na-4-ClBeAmGl和rPET/Na-4-ClAcAmBe增加了11.7°C，与rPET相比，18.6°C和1.9°C，这表明rPET和Na-4-ClBeAmGl之间的较低失配率(在b轴上为0.8%)导致Na-4-ClBeAmGl最有能力诱导外延结晶和沿rPET的b轴方向定向生长。小角X射线衍射(SAXS)结果证明了这一结论。同时,Na-4-ClBeAmGl的添加使rPET的弯曲强度和热变形温度（HDT）的增加最明显，分别为20.4％和46.7％。
