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首页> 外文期刊>Polymer Degradation and Stability >Improvement of UV stability and mechanical properties of biopolyesters through the addition of β-carotene
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Improvement of UV stability and mechanical properties of biopolyesters through the addition of β-carotene

机译：通过添加β-胡萝卜素改善生物聚酯的紫外线稳定性和机械性能

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摘要

3-carotene, the most abundant carotenoid in nature and a natural antioxidant, has been added at a concentration of 2 × 10~(-4) g per mL of polymer film forming solution to three biopolyester matrices, poly(lactic acid) (PLA), polycaprolactone (PCL) and polyhydroxybutyrate-co-valerate (PHBV). The dispersion and stability of the antioxidant within the films was studied using confocal Raman imaging spectroscopy, colorimetry and UV/visible spectrophotometry. The films were characterized in terms of thermal and mechanical properties in comparison with control films without 3-carotene. Addition of β-carotene to the three biopolyesters studied resulted in significant increases in the deformation at break and lower Young modulus. This antioxidant is thought to act as a plasticizer in the biopolyesters, thus increasing their free volume and causing a change in their thermal properties. Moreover, when exposed to UV light the mechanical properties of the films with P-carotene were less affected displaying, in general, higher modulus and similar ultimate tensile strength while keeping the films more ductile than the pure films. Therefore, β-carotene can be potentially used as a natural additive to increase the UV stability of the biopolyesters.
机译：3-胡萝卜素是自然界中最丰富的类胡萝卜素和天然抗氧化剂，以每毫升聚合物成膜溶液2×10〜（-4）g的浓度添加到三种生物聚酯基质聚乳酸（PLA）中），聚己内酯（PCL）和聚羟基丁酸酯-共-戊酸酯（PHBV）。使用共聚焦拉曼成像光谱，比色法和紫外/可见分光光度法研究了抗氧化剂在薄膜中的分散性和稳定性。与没有3-胡萝卜素的对照膜相比，以热和机械性能为特征的膜。将β-胡萝卜素添加到所研究的三种生物聚酯中会导致断裂变形显着增加，并降低杨氏模量。这种抗氧化剂被认为在生物聚酯中起增塑剂的作用，从而增加了其自由体积并引起了其热性能的改变。而且，当暴露于紫外光下时，具有β-胡萝卜素的薄膜的机械性能受到的影响较小，通常显示出较高的模量和相似的极限拉伸强度，同时保持薄膜比纯薄膜更具延展性。因此，β-胡萝卜素可以潜在地用作天然添加剂以增加生物聚酯的紫外线稳定性。

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