增塑剂
差示扫描量热法
热塑性塑料
山梨醇
淀粉
材料科学
热重分析
甘油
极限抗拉强度
玻璃化转变
拉伸试验
复合材料
热稳定性
化学工程
聚合物
化学
有机化学
物理
工程类
热力学
作者
Jaume Gómez-Caturla,Juan Ivorra Martínez,O. Fenollar,Rafael Balart,Daniel García-García,Franco Dominici,Debora Puglia,Luigi Torre
标识
DOI:10.1016/j.ijbiomac.2024.130773
摘要
This work reports on the development of starch-rich thermoplastic based formulations produced by using mango kernel flour, avoiding the extraction process of starch from mango kernel to produce these materials. Glycerol, sorbitol and urea at 15 wt% are used as plasticizers to obtain thermoplastic starch (TPS) formulations by extrusion and injection-moulding processes. Mechanical results show that sorbitol and urea allowed to obtain samples with tensile strength and elongation at break higher than the glycerol-plasticized sample, achieving values of 2.9 MPa of tensile strength and 42 % of elongation at break at 53 % RH. These results are supported by field emission scanning electron microscopy (FESEM) micrographs, where a limited concentration of voids was observed in the samples with sorbitol and urea, indicating a better interaction between starch and the plasticizers. Thermogravimetric analysis (TGA) shows that urea and sorbitol increase the thermal stability of TPS in comparison to the glycerol-plasticized sample. Differential scanning calorimetry (DSC) and dynamic-mechanical-thermal analysis (DMTA) verify the increase in stiffness of the sorbitol and urea plasticized TPS and also illustrate an increase in the glass transition temperature of both samples in comparison to the glycerol-plasticized sample. Glass transition temperatures of 45 °C were achieved for the sample with sorbitol.
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