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Oxidation-mediated chitosan as additives for creation of chitosan aerogels with diverse three-dimensional interconnected skeletons

机译：氧化介导的壳聚糖作为添加剂，用于创建具有各种三维互连骨架的壳聚糖气凝胶

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摘要

Naturally occurring polymer-based aerogels have myriad practical utilizations due to environmentally benign and fruitful resources. However, engineering morphology-controllable biomass aerogels still represents a great challenge. Here we present a facile solution to synthesize chitosan aerogels having distinguished textures by reacting oxidized chitosan with formaldehyde and chitosan sol. In more detail, chitosan was chemically oxidized using two types of oxidation agents such as ammonium persulphate (SPD) and sodium periodate (APS) to obtain corresponding oxidized chitosan, subsequently cross-linked with chitosan solution containing formaldehyde to harvest SPD-oxidized chitosan aerogels (SCAs) and APS-SPD-oxidized ones (ASCAs) after aging, solvent exchange and supercritical drying processes. We found that the morphologies of as-prepared chitosan aerogels are strongly dependent upon the oxidation pattern towards chitosan. The structural textures of SCAs and ASCAs appear nanoflake-like and nanofiber-like structures, which may be related to spatial freedom of active groups located in chitosan. Selected area electron diffraction analysis reveals that the crystalline properties of chitosan aerogels generally appear the serious deterioration comparing to raw chitosan owing to their interconnected skeletal structure formation. The occurrence of characteristic groups displays cross-linked chain construction by using chemical state measurements such as FT-IR and XPS. Further, a plausible mechanism for controlling morphology of chitosan aerogels is also established. This new family of method for creation of chitosan aerogels may open up a perspective for biomass aerogels with controllable textures. (C) 2016 Elsevier B.V. All rights reserved.
机译：天然存在的基于聚合物的气凝胶由于对环境有益和富有成果的资源而具有无数的实际用途。然而，工程形态学可控的生物质气凝胶仍然代表着巨大的挑战。在这里，我们提出了一种通过氧化的脱乙酰壳多糖与甲醛和脱乙酰壳多糖溶胶反应来合成质地卓越的脱乙酰壳多糖气凝胶的简便方法。更详细地讲，使用过硫酸铵（SPD）和高碘酸钠（APS）等两种氧化剂对壳聚糖进行化学氧化以获得相应的氧化壳聚糖，然后将其与含甲醛的壳聚糖溶液交联以收获SPD氧化的壳聚糖气凝胶（经过老化，溶剂交换和超临界干燥过程后的ASCA-SPD和APS-SPD氧化的ASCA。我们发现，制备的壳聚糖气凝胶的形态在很大程度上取决于对壳聚糖的氧化模式。 SCA和ASCA的结构纹理表现为纳米片状和纳米纤维状结构，这可能与壳聚糖中活性基团的空间自由度有关。选定区域的电子衍射分析表明，由于壳聚糖气凝胶的相互连接的骨架结构形成，与原始壳聚糖相比，其晶体性能通常会出现严重恶化。通过使用化学状态测量（例如FT-IR和XPS），特征基团的出现显示出交联的链结构。此外，还建立了控制壳聚糖气凝胶形态的合理机制。这种新型的壳聚糖气凝胶的制备方法可以为质地可控的生物质气凝胶开辟前景。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第2期|1220-1225|共6页
  • 作者

    Zhang Sizhao; Feng Jian; Feng Junzong; Jiang Yonggang;

  • 作者单位

    Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Chitosan; Selective oxidation; Aerogel; Controllable morphology; Mechanistic course;

    机译：壳聚糖选择性氧化气凝胶形态可控机理过程;

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