Kwaśniewska Anita, Chocyk Dariusz, Gładyszewski Grzegorz, Borc Jarosław, Świetlicki Michał, Gładyszewska Bożena
Department of Applied Physics, Lublin University of Technology, 20-618 Lublin, Poland.
Department of Biophysics, University of Life Sciences, 20-950 Lublin, Poland.
Polymers (Basel). 2020 Jan 2;12(1):73. doi: 10.3390/polym12010073.
The aim of study was to investigate the influence of kaolin on the physical properties and utility of film produced from native starch. The work involved measurements of strength, structure, and thermal properties. The films were prepared by the casting method. Composite films with 0%, 5%, 10%, and 15% kaolin additives were examined. Measurements of mechanical properties were carried out using the uniaxial tensile test, the nanoindentation test, and nanoscratching. Surface properties were examined by atomic force microscopy and contact angle measurements. Structure was determined by the X-ray diffraction method, and thermal properties were determined by differential scanning calorimetry. A significant influence of kaolin on the strength parameters and thermal and barrier properties of composite films was found. An increase in kaolin content reduced the tensile strength, Young's modulus, and Poisson's ratio. Structural analysis showed a partial intercalation and the layered arrangement of kaolin particles. Kaolin additives increased the barrier properties of water vapor in composite films of about 9%. Biopolymer modification by nanoclay reduced the thermal stability of composite films by 7% and could accelerate the biodegradation process. Increasing the concentration of kaolin in the biopolymer matrix led to heightened surface roughness (approximately 64%) and wettability of the surfaces of the film composites of 58%.
本研究的目的是研究高岭土对由天然淀粉制成的薄膜的物理性能和实用性的影响。这项工作涉及强度、结构和热性能的测量。薄膜通过流延法制备。对添加了0%、5%、10%和15%高岭土的复合薄膜进行了检测。使用单轴拉伸试验、纳米压痕试验和纳米划痕试验进行力学性能测量。通过原子力显微镜和接触角测量来检测表面性能。通过X射线衍射法确定结构，通过差示扫描量热法确定热性能。发现高岭土对复合薄膜的强度参数以及热性能和阻隔性能有显著影响。高岭土含量的增加降低了拉伸强度、杨氏模量和泊松比。结构分析表明高岭土颗粒存在部分插层和层状排列。高岭土添加剂使复合薄膜的水蒸气阻隔性能提高了约9%。用纳米粘土对生物聚合物进行改性使复合薄膜的热稳定性降低了7%，并可能加速生物降解过程。增加生物聚合物基质中高岭土的浓度会导致薄膜复合材料表面粗糙度提高（约64%），润湿性提高58%。
