Universidad Del Papaloapan, Departamento de Química, Circuito Central 200, C.P. 68301, Tuxtepec, Oaxaca, Mexico.
Instituto de Ciencia y Tecnología de Polímeros (ICTP), C/ Juan de La Cierva 3, 28006, Madrid, Spain.
Carbohydr Res. 2021 Oct;508:108401. doi: 10.1016/j.carres.2021.108401. Epub 2021 Jul 14.
Chemical modification of banana starch (Musa paradisiaca L.) with the degradation products of virgin and bottle waste of polyethylene terephthalate was carried out in situ. The modified starch was characterized by FTIR and NMR, which allowed proposing three chemical structures. SEM micrographs showed that the morphology of the modified starch granule is directly related with mass ratio of Starch/PET and type of PET used in the reaction. The crystallinity of the modified starch decreased up to 92.6% and 62.5% using bottle waste and virgin PET, respectively, according to XRD diffractograms. TGA analysis showed that the starch degradation temperature decreased by 12 °C. Modified starch films were elaborate and its electrical conductivity was found to be 2.9 times compared to that of native starch. The starch/PET film presented the highest value in the mechanical property of elongation at break compared to the starch-only film. The modified starch film was degraded above 80% by aqueous hydrolysis.
采用降解产物对芭蕉芋淀粉（Musa paradisiaca L.）进行化学修饰，降解产物来源于原生和废弃的聚对苯二甲酸乙二醇酯。采用傅里叶变换红外光谱（FTIR）和核磁共振（NMR）对修饰后的淀粉进行了表征，提出了三种化学结构。扫描电子显微镜（SEM）照片表明，淀粉颗粒的形态与反应中使用的淀粉/聚对苯二甲酸乙二醇酯的质量比和聚对苯二甲酸乙二醇酯的类型直接相关。根据 X 射线衍射图谱，使用废弃的和原生的聚对苯二甲酸乙二醇酯处理后，淀粉的结晶度分别下降了 92.6%和 62.5%。热重分析（TGA）表明，淀粉的降解温度降低了 12°C。制备了修饰淀粉薄膜，并发现其电导率比天然淀粉提高了 2.9 倍。与仅含淀粉的薄膜相比，淀粉/聚对苯二甲酸乙二醇酯薄膜在断裂伸长率方面表现出更高的机械性能。修饰淀粉薄膜在水水解作用下的降解率超过 80%。
