Influence of Carboxyl Charge Density on Properties of Extruded Cellulose Films,Industrial & Engineering Chemistry Research

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Influence of Carboxyl Charge Density on Properties of Extruded Cellulose Films
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-14 , DOI: 10.1021/acs.iecr.1c01716
Mohammadhadi Moradian ₁ , Md Nur Alam ₂ , Theo G. M. van de Ven ₁

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Modified pure cellulose-based films were prepared via a scalable process by cellulose carboxymethylation, producing an alkaline dope and flow casting through a slit in an acid bath, followed by washing and drying. The effect of different carboxyl charge densities (0.9, 1.5, and 2.5 mmol/g) on several properties of the films was investigated. Fourier transform infrared and nuclear magnetic resonance spectroscopy showed the formation of carboxyl bonds on cellulose. However, more carboxyl charge caused more fiber dissolution, which greatly affected physical and mechanical properties of the films. It was found that the most transparent, stretchable, moisture absorbent, and densest films were produced with a 2.5 mmol/g charge density, while the highest tenacity and lowest water vapor permeation was measured for 1.5 mmol/g films. Overall, this straightforward procedure can be applied for the fabrication of biodegradable, recyclable, water insoluble, and strong films, a great promising alternative to plastics for packaging.

中文翻译：

羧基电荷密度对挤出纤维素薄膜性能的影响

改性纯纤维素基薄膜是通过纤维素羧甲基化的可扩展工艺制备的，生产碱性涂料并通过酸浴中的狭缝流延，然后洗涤和干燥。研究了不同羧基电荷密度（0.9、1.5 和 2.5 mmol/g）对薄膜的几种性能的影响。傅里叶变换红外光谱和核磁共振光谱显示纤维素上形成了羧基键。然而，更多的羧基电荷导致更多的纤维溶解，极大地影响了薄膜的物理和机械性能。发现最透明、可拉伸、吸湿性和最致密的薄膜是在 2.5 mmol/g 电荷密度下生产的，而对于 1.5 mmol/g 薄膜测得的强度最高和水蒸气渗透率最低。总体，

更新日期：2021-09-29

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