Wongphan Phanwipa, Nerín Cristina, Harnkarnsujarit Nathdanai
Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, 50 Ngam Wong Wan Rd., Latyao, Chatuchak, Bangkok 10900, Thailand.
Department of Analytical Chemistry, Aragon Institute of Engineering Research I3A, EINA-University of Zaragoza, Maria de Luna 3, 50018 Zaragoza, Spain.
Int J Biol Macromol. 2024 Dec;283(Pt 3):137906. doi: 10.1016/j.ijbiomac.2024.137906. Epub 2024 Nov 20.
Phosphate derivatives contain a high number of reactive groups that interact functionally with various polymers. Tetrasodium pyrophosphate (Na₄P₂O₇), sodium tripolyphosphate (Na₅P₃O₁₀), and sodium hexametaphosphate (Na₆(PO₃)₆) were incorporated into bioplastic polybutylene-adipate-terephthalate (PBAT) blended with thermoplastic cassava starch (TPS) in blown films. Their physicochemical, morphological, thermal, and antimicrobial properties were investigated. PBAT/TPS blended films were compounded via blown film extrusion to produce functional packaging. Infrared spectra indicated starch modification through the disruption of anhydroglucose monomer units, analyzed by ATR-FTIR, providing a more amorphous fraction and altering the properties of the films. PBAT/TPS films containing phosphate compounds exhibited non-homogeneous structures, with dispersed clumps within the film matrices that decreased tensile strength. The incorporation of phosphate compounds modified the storage modulus and relaxation temperature of PBAT/TPS films, influencing molecular mobility, decreasing heat transfer efficiency in seal strength, and enhancing stiffness due to starch disruption and interaction between the phosphate compound and the PBAT/TPS matrix. Wettability and permeability of PBAT/TPS films were modified by changes in polymer structure.
磷酸盐衍生物含有大量能与各种聚合物发生功能相互作用的反应基团。焦磷酸四钠（Na₄P₂O₇）、三聚磷酸钠（Na₅P₃O₁₀）和六偏磷酸钠（Na₆(PO₃)₆）被添加到与热塑性木薯淀粉（TPS）共混的生物塑料聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）中，制成吹塑薄膜。对其物理化学、形态、热学和抗菌性能进行了研究。通过吹塑薄膜挤出法将PBAT/TPS共混薄膜制成功能性包装材料。红外光谱表明，通过ATR-FTIR分析，脱水葡萄糖单体单元的破坏导致了淀粉的改性，形成了更多的无定形部分，从而改变了薄膜的性能。含有磷酸盐化合物的PBAT/TPS薄膜呈现出非均匀结构，薄膜基质中存在分散的团块，这降低了拉伸强度。磷酸盐化合物的加入改变了PBAT/TPS薄膜的储能模量和松弛温度，影响了分子流动性，降低了密封强度中的热传递效率，并由于淀粉的破坏以及磷酸盐化合物与PBAT/TPS基质之间的相互作用而提高了刚度。PBAT/TPS薄膜的润湿性和渗透性因聚合物结构的变化而改变。
