Nanoscience and Nanotechnology (International Program/Interdisciplinary), Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Faculty of Science, Chiang Mai University, Suthep, Mueang, Chiang Mai 50200, Thailand.
Int J Biol Macromol. 2023 Dec 31;253(Pt 3):126783. doi: 10.1016/j.ijbiomac.2023.126783. Epub 2023 Sep 11.
Novel biodegradable thermoplastic starch (TPS) with high mechanical properties and water resistance was developed using reactive blending technique. Effect of zinc oxide (ZnO) addition to TPS properties and reaction was investigated. Thermoplastic modified starch (TPMS) was prepared by melt-mixing modified starch with glycerol 70/30%wt/wt. Carboxy methyl cellulose (CMC) 5%wt was incorporated with modified starch, glycerol, and zinc oxide (ZnO) 0-5 %wt. Fourier-transform infrared (FTIR) spectroscopy analysis confirmed the formation of the carboxyl anion (OZn) between the -COO of CMC and the free Zn ion of ZnO. The tensile strength of the TPMS/CMC/ZnO blend increased 7 time with ZnO 5 % (14 MPa) addition compared to TPMS (2 MPa). The color (∆E) of TPMS/CMC/ZnO differed notably at high ZnO concentrations (1-5 %wt). The TPMS/CMC blend displayed a smooth fracture surface due to the miscibility of the materials. Small particles of ZnO dispersed finely in the TPMS matrix and increased the interfacial tension and water contact angle of the blends. The miscibility of TPS with CMC and the occurrence of ionic interactions of -COO of CMC and -OH of starch with the Zn ion as physical crosslinking were indicated to improve the mechanical properties and water resistance of the blends.
采用反应共混技术开发了具有高机械性能和耐水性的新型可生物降解热塑性淀粉（TPS）。研究了氧化锌（ZnO）对 TPS 性能和反应的影响。通过熔融共混改性淀粉与甘油 70/30%wt/wt 制备热塑性改性淀粉（TPMS）。将羧甲基纤维素（CMC）5%wt 与改性淀粉、甘油和氧化锌（ZnO）0-5%wt 混合。傅里叶变换红外（FTIR）光谱分析证实了 CMC 的-COO 与 ZnO 的游离 Zn 离子之间形成了羧酸盐阴离子（OZn）。与 TPMS（2MPa）相比，添加 5%（14MPa）ZnO 后，TPMS/CMC/ZnO 共混物的拉伸强度增加了 7 倍。当 ZnO 浓度较高（1-5%wt）时，TPMS/CMC/ZnO 的颜色（∆E）差异显著。由于材料的混溶性，TPMS/CMC 共混物显示出光滑的断裂表面。ZnO 小颗粒在 TPMS 基体中分散良好，增加了共混物的界面张力和水接触角。TPS 与 CMC 的混溶性以及 CMC 的-COO 与淀粉的-OH 与 Zn 离子的离子相互作用的发生被认为可以改善共混物的机械性能和耐水性。
