Shandong Key Laboratory of Molecular Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Shandong Key Laboratory of Molecular Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Carbohydr Polym. 2022 Feb 15;278:118975. doi: 10.1016/j.carbpol.2021.118975. Epub 2021 Dec 6.
The research and development of substitutes for petroleum-based plastics has become a hot topic. The N-(2-hydroxyl)-propyl-3-trimethylammonium chitosan chloride (HTCC, 10 wt%)/sodium carboxymethyl cellulose (CMC) films have showed enhanced mechanical properties, which also provide a potential substitute to petroleum-based plastics. In this paper, calcium carbonate was crystallized (cry-CaCO) in HTCC/CMC film-forming solutions, and the effects of the cry-CaCO particles on HTCC/CMC film properties including microstructures, mechanical properties, thermal stability, whiteness, and wettability were characterized. An HTCC/CMC film with commercially available CaCO (com-CaCO) was used as a control. The results showed that the cry-CaCO promoted the homogeneous distribution of the HTCC/CMC matrix and significantly improved mechanical properties, but showed little effect on the thermal stability, whiteness and wettability of the films. To reveal the affecting mechanism of cry-CaCO on HTCC/CMC film properties, the cry-CaCO particles were isolated from film-forming solutions and characterized by scanning electron microscope (SEM), powder X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermogravimetric analysis (TGA) methods. The results showed that the HTCC/CMC matrix modulated spherical CaCO particles, and the macromolecules were encapsulated in cry-CaCO particles, decreasing their adhesion to the HTCC/CMC matrix while increasing their distribution in the HTCC/CMC matrix. The strong electrostatic, hydrogen bonding and flexible interaction between CMC and cry-CaCO particles played a key role in improving the mechanical properties of HTCC/CMC films.
基于石油的塑料替代品的研发已成为热门话题。N-(2-羟丙基)-3-三甲基氯化铵壳聚糖盐酸盐（HTCC，10wt%）/羧甲基纤维素钠（CMC）薄膜显示出增强的机械性能，这也为石油基塑料提供了潜在的替代品。在本文中，碳酸钙在 HTCC/CMC 成膜溶液中结晶（cry-CaCO），并研究了 cry-CaCO 颗粒对 HTCC/CMC 薄膜性能的影响，包括微观结构、机械性能、热稳定性、白度和润湿性。将具有商业可用性的碳酸钙（com-CaCO）的 HTCC/CMC 薄膜用作对照。结果表明，cry-CaCO 促进了 HTCC/CMC 基质的均匀分布，并显著提高了机械性能，但对薄膜的热稳定性、白度和润湿性影响不大。为了揭示 cry-CaCO 对 HTCC/CMC 薄膜性能的影响机制，从成膜溶液中分离出 cry-CaCO 颗粒，并通过扫描电子显微镜（SEM）、粉末 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）方法对其进行了表征。结果表明，HTCC/CMC 基质调制了球形 CaCO 颗粒，大分子被包裹在 cry-CaCO 颗粒中，降低了它们与 HTCC/CMC 基质的附着力，同时增加了它们在 HTCC/CMC 基质中的分布。CMC 和 cry-CaCO 颗粒之间的强静电、氢键和柔性相互作用在提高 HTCC/CMC 薄膜的机械性能方面发挥了关键作用。
