Liang Wei, Zheng Jiayu, Saleh Ahmed S M, Zhao Wenqing, Liu Xinyue, Su Chunyan, Yan Mengting, Ge Xiangzhen, Shen Huishan, Ospankulova Gulnazym, Zhainagul Kh Kakimova, Li Wenhao
Engineering Research Center of Grain and Oil Functionalized Processing in Universities of Shaanxi Province, College of Food Science and Engineering, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, PR China.
Department of Food Science and Technology, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt.
Int J Biol Macromol. 2023 Jan 15;225:172-184. doi: 10.1016/j.ijbiomac.2022.10.199. Epub 2022 Oct 27.
Exploration and synthesis of degradable plastics can alleviate and avoid environmental pollution induced by petroleum-based plastics. In this study, a konjac glucomannan (KGM)/zein/PVA ternary blend plastic was successfully prepared by casting. The results showed that, despite the presence of particle aggregation from incompatible components in blend plastic, the addition of KGM and zein improved its compatibility which is consistent with the formation of continuous dark regions and the reduction of roughness average (Ra) results in the AFM characterization. Also, XRD and FT-IR results indicated that the addition of KGM and zein disrupted the molecular and crystalline structure of PVA, induced stretching vibration of alcohol and hydroxyl groups, and crystallinity reduction. In addition, KGM deacetylation (d-KGM) reduced the intramolecular hydroxyl groups, reduced the water absorption and water vapor transmission rate of the blend plastics, and increased the crystallization temperature (Tc) and melting temperature (Tm). Furthermore, the blended plastics exhibited the best tensile strength (TS), elongation at break (E), and elastic modulus (EM) when the proportion of KGM to zein was 9:1. Notably, the blended plastic with KGM and zein added displayed more pores and cracks after soil burial, implying that the lack of degradability of pure PVA plastic was improved.
可降解塑料的探索与合成可以减轻和避免石油基塑料引起的环境污染。在本研究中，通过流延法成功制备了魔芋葡甘聚糖（KGM）/玉米醇溶蛋白/聚乙烯醇（PVA）三元共混塑料。结果表明，尽管共混塑料中存在不相容组分的颗粒团聚现象，但KGM和玉米醇溶蛋白的加入改善了其相容性，这与原子力显微镜（AFM）表征中连续暗区的形成以及平均粗糙度（Ra）的降低结果一致。此外，X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）结果表明，KGM和玉米醇溶蛋白的加入破坏了PVA的分子和晶体结构，诱导了醇基和羟基的伸缩振动，并降低了结晶度。此外，KGM脱乙酰化产物（d-KGM）减少了分子内羟基，降低了共混塑料的吸水率和水蒸气透过率，并提高了结晶温度（Tc）和熔点（Tm）。此外，当KGM与玉米醇溶蛋白的比例为9:1时，共混塑料表现出最佳的拉伸强度（TS）、断裂伸长率（E）和弹性模量（EM）。值得注意的是，添加了KGM和玉米醇溶蛋白的共混塑料在土壤掩埋后显示出更多的孔隙和裂纹，这意味着纯PVA塑料缺乏降解性的问题得到了改善。
