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首页> 外文期刊>Journal of Polymers and the Environment >Properties and Biodegradation of Thermoplastic Starch Obtained from Grafted Starches with Poly(lactic acid)
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Properties and Biodegradation of Thermoplastic Starch Obtained from Grafted Starches with Poly(lactic acid)

机译：聚乳酸接枝淀粉获得的热塑性淀粉的性质及生物降解

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摘要

Properties and biodegradation of thermoplastic starch obtained using granular starches grafted with poly(lactic acid) (St-g-PLA) were studied. The grafting of PLA on the starch granule was verified by the emergence of the carbonyl group in the FTIR spectra and the higher diameter of the grafted starch granule. Thermoplastic starch from ungrafted granular starch (TPS) and grafted granular starch (TPGS) were obtained by mixing ungrafted or grafted starch with water, glycerol or sorbitol in a mixer. TPS and TPGS behave as plastic materials, and their mechanical properties depend on the type of plasticizer used. Materials with glycerol as the plasticizer exhibited less rigidity than the materials obtained using sorbitol. The presence of starch-g-PLA results in an increase in the elongation of the thermoplastic material. TPS and TPGS were hydrolysed by amylolytic enzymes in short-time periods compared to granular PLA-grafted starches.
机译：研究了用聚乳酸（St-g-PLA）接枝的粒状淀粉获得的热塑性淀粉的性能和生物降解性。通过FTIR光谱中羰基的出现以及接枝淀粉颗粒的较大直径，可以验证PLA在淀粉颗粒上的接枝。通过将未接枝或接枝的淀粉与水，甘油或山梨糖醇在混合机中混合，可以从未接枝的粒状淀粉（TPS）和接枝的粒状淀粉（TPGS）中获得热塑性淀粉。 TPS和TPGS就像塑料一样，其机械性能取决于所用增塑剂的类型。与使用山梨糖醇获得的材料相比，含有甘油作为增塑剂的材料显示出较低的刚性。淀粉-g-PLA的存在导致热塑性材料的伸长率增加。与颗粒状PLA接枝淀粉相比，TPS和TPGS在短时间内被淀粉分解酶水解。

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