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2 results on '"Zhiqiang, Ou"'

1. High-Performance and Water Resistant PVA-Based Films Modified by Air Plasma Treatment

Author

Xin Rao, Qi Zhou, Qin Wen, Zhiqiang Ou, Lingying Fu, Yue Gong, Xueyu Du, and Chunqing Huo

Subjects
air plasma, PVA film, surface modification, water resistance, crosslinking, Chemical technology, TP1-1185, Chemical engineering, TP155-156
Abstract

Plasma treatment is considered a straightforward, cost-effective, and environmental-friendly technique for surface modification of film materials. In this study, air plasma treatment was applied for performance improvement of pure PVA, cellulose nanocrystal (CNC)/PVA, and CNC/oxalic acid (OA)/PVA films. Compared with the original performance of pure PVA, the mechanical properties and water resistance of air plasma treated films were greatly improved. Among them, the CNC/OA/PVA film treated by three minutes of air plasma irradiation exhibits the most remarkable performance in mechanical properties (tensile strength: 132.7 MPa; Young’s modulus: 5379.9 MPa) and water resistance (degree of swelling: 47.5%; solubility: 6.0%). By means of various modern characterization methods, the wettability, surface chemical structure, surface roughness, and thermal stability of different films before and after air plasma treatment were further revealed. Based on the results obtained, the air plasma treatment only changed the surface chemical structure, surface roughness, and hydrophobicity, while keeping the inner structure of films intact.

Published
2022
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2. Preparation and Characterization of Functional Films Based on Chitosan and Corn Starch Incorporated Tea Polyphenols

Author

Fuyang He, Tao Zhu, Lili Ren, Zhiqiang Ou, Lepeng Gao, and Jian Xu

Subjects
Materials science, Starch, corn starch, 02 engineering and technology, Shelf life, physical properties, Chitosan, chemistry.chemical_compound, 0404 agricultural biotechnology, Materials Chemistry, medicine, Food science, Water content, Aqueous solution, technology, industry, and agriculture, food and beverages, 04 agricultural and veterinary sciences, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Engineering (General). Civil engineering (General), 040401 food science, Surfaces, Coatings and Films, tea polyphenols, chemistry, Polyphenol, Attenuated total reflection, Swelling, medicine.symptom, chitosan, TA1-2040, 0210 nano-technology
Abstract

The functional films based on chitosan and corn starch incorporated tea polyphenols were developed through mixing the chitosan and starch solution and the powder of tea polyphenols by the casting method. The objective of this research was to investigate the effect of different concentrations of tea polyphenols on the functional properties of the films. Attenuated total reflectance Fourier transform infrared spectrometry and X-ray diffraction were used to investigate the potential interactions among chitosan, corn starch and tea polyphenols in the blend films. Physical properties of the blend films, including density, moisture content, opacity, color, water solubility and water swelling, as well as morphological characteristics, were measured. The results demonstrated that the incorporation of tea polyphenols caused the blend films to lead to a darker appearance. The water solubility of the blend film increased with the increase of tea polyphenol concentrations, while moisture content and swelling degree decreased. The hydrogen bonding between chitosan, starch and tea polyphenols restricted the movement of molecular chains and was helpful to the stability of the blend films. The results suggested that these biodegradable blend films could potentially be used as packaging films for the food and drug industries to extend the shelf life to maintain their quality and safety.

Published
2021

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