Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China.
Carbohydr Polym. 2013 Jan 30;92(1):810-6. doi: 10.1016/j.carbpol.2012.09.007. Epub 2012 Oct 10.
Blends of entirely bio-sourced polymers, namely polylactide (PLA) and starch, have been melt-compounded by lab-scale co-extruder with epoxidized soybean oil (ESO) as a reactive compatibilizer. The starch granules were grafted with the maleic anhydride (MA) to enhance its reactivity with ESO. The ready reactions between the epoxy groups on ESO, the MA groups on MA-grafted starch (MGST) and the end carboxylic acid groups of PLA brought blending components together and formed a compatible compound. An elongation at break (EB) of 140% was obtained in the blend of PLA/MGST/ESO (80/10/10), increased from 5% of a pure PLA. The grafting content of the MA on the starch granules primarily determined the compatibility and properties of the ternary blends, which was also affected by the relative amount of MGST and ESO.
完全生物源聚合物的共混物，即聚乳酸（PLA）和淀粉，已通过实验室规模的共挤出机与环氧大豆油（ESO）熔融共混，作为反应性增容剂。淀粉颗粒已接枝马来酸酐（MA）以提高其与 ESO 的反应性。ESO 上的环氧基团、MA 接枝淀粉（MGST）上的 MA 基团和 PLA 的末端羧酸基团之间的快速反应将共混成分聚集在一起并形成了一种相容的化合物。在 PLA/MGST/ESO（80/10/10）共混物中，断裂伸长率（EB）达到 140%，比纯 PLA 的 5%有了显著提高。淀粉颗粒上 MA 的接枝含量主要决定了三元共混物的相容性和性能，它还受到 MGST 和 ESO 的相对含量的影响。
