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首页> 美国卫生研究院文献>Polymers >Poly(lactic acid) (PLA)/Poly(butylene succinate-co-adipate) (PBSA) Compatibilized Binary Biobased Blends: Melt Fluidity Morphological Thermo-Mechanical and Micromechanical Analysis
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Poly(lactic acid) (PLA)/Poly(butylene succinate-co-adipate) (PBSA) Compatibilized Binary Biobased Blends: Melt Fluidity Morphological Thermo-Mechanical and Micromechanical Analysis

机译：聚（乳酸）（PLA）/聚（丁烯琥珀酸酯 - 共己酸酯）（PBSA）相容性二元生物化共混物：熔融流动性形态学热机械和微机械分析

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In this work poly(lactic) acid (PLA)/poly(butylene succinate-co-adipate) (PBSA) biobased binary blends were investigated. PLA/PBSA mixtures with different compositions of PBSA (from 15 up to 40 wt.%) were produced by twin screw-extrusion. A first screening study was performed on these blends that were characterized from the melt fluidity, morphological and thermo-mechanical point of view. Starting from the obtained results, the effect of an epoxy oligomer (EO) (added at 2 wt.%) was further investigated. In this case a novel approach was introduced studying the micromechanical deformation processes by dilatometric uniaxial tensile tests, carried out with a videoextensometer. The characterization was then completed adopting the elasto-plastic fracture approach, by the measurement of the capability of the selected blends to absorb energy at a slow rate. The obtained results showed that EO acts as a good compatibilizer, improving the compatibility of the rubber phase into the PLA matrix. Dilatometric results showed different micromechanical responses for the 80–20 and 60–40 blends (probably linked to the different morphology). The 80–20 showed a cavitational behavior while the 60–40 a deviatoric one. It has been observed that while the addition of EO does not alter the micromechanical response of the 60–40 blend, it profoundly changes the response of the 80–20, that passed to a deviatoric behavior with the EO addition.
机译：在该工作中，研究了聚（乳酸）酸（PLA）/聚（丁二酸丁酸酯 - 共己酸酯）（PBSA）生物化二元共混物。 PLA / PBSA混合物用不同的PBSA组成（15至40重量％）通过双螺杆挤出产生。对这些共混物进行第一筛选研究，其特征在于熔体流动性，形态学和热机械的观点。从所得结果开始，进一步研究了环氧低聚物（EO）的效果（在2重量％中加入）。在这种情况下，引入了一种新的方法，通过横向性单轴拉伸试验来研究微机械变形过程，用扫描仪进行。然后完成表征采用弹性塑料断裂方法，通过测量所选择的混合物以缓慢吸收能量的能力。得到的结果表明，EO充当良好的增容剂，提高橡胶相进入PLA基质的相容性。膨胀结果显示了80-20和60-40混合物的不同微机械响应（可能与不同的形态相关）。 80-20显示了空化行为，而60-40是偏离的。已经观察到，虽然加入EO不会改变60-40混合物的微机械响应，但它深刻地改变了80-20的响应，与EO添加到脱离的行为。

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