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首页> 外文期刊>RSC Advances >Facile and green preparation of hemicellulose-based film with elevated hydrophobicity via cross-linking with citric acid
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Facile and green preparation of hemicellulose-based film with elevated hydrophobicity via cross-linking with citric acid

机译：通过与柠檬酸交联，通过交联疏水性升高的疏水性，与柠檬酸相连的薄膜和绿色制备

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摘要

Hemicellulose has shown great potential in food packaging due to its excellent biodegradability and low oxygen permeability. However, its strong hydrophilicity leads to poor moisture resistance and hinders its wide application. To address this issue, herein a ternary carboxylic acid, citric acid (CA), was incorporated into hemicellulose as esterifying agent to form a crosslinking structure via the esterification reaction. The CA-modified hemicellulose films showed an increased contact angle of 87.5 degrees (vs. 40.5 degrees for unmodified film), demonstrating that the hydrophobicity of hemicellulose had been improved significantly. In addition, the esterification/cross-linking modification enhanced oxygen barrier performance with oxygen permeability decreasing from 1053 (cm(3) mu m) (m(2) d kPa)(-1) to 1.8 (cm(3) mu m) (m(2) d kPa)(-1). Moreover, the tensile strength rose to a peak value and then fell back at higher CA content. Effect of CA addition on elongation at break exhibited an opposite trend. The modified hemicellulose films with 20% CA addition possessed the highest tensile strength and the lowest elongation at break. Morphology observation with scanning electron microscopy indicated that at CA content exceeding 20%, the modified films were dense with a smooth surface, illustrating the improvement of phase compatibility. A possible mechanism for esterification/cross-linking was proposed to elucidate the connection between CA addition and film performances.
机译：由于其优异的生物降解性和低氧气渗透性，半纤维素在食品包装中显示出巨大潜力。然而，其强的亲水性导致耐湿性差，妨碍其宽的应用。为了解决该问题，本文在本文中，将柠檬酸（CA）纳入半纤维素作为酯化剂，以通过酯化反应形成交联结构。 Ca-改性的半纤维素膜显示出87.5度的接触角增加（对于未改性薄膜的40.5度），表明半纤维素的疏水性显着提高。此外，酯化/交联改性改变具有从1053（3）μm）（M（2）D KPA）（ - 1）至1.8（cm（3）mu m）的氧气渗透率下降的氧气阻隔性能（M（2）D KPA）（ - 1）。此外，拉伸强度升至峰值，然后以较高的Ca含量倒回。 Ca添加对断裂伸长率的影响表现出相反的趋势。具有20％Ca添加的改性的半纤维素薄膜具有最高的拉伸强度和突破的最低伸长率。用扫描电子显微镜观察的形态学观察表明，在约20％的Ca含量下，改性薄膜具有光滑的表面，说明相位兼容性的提高。提出了一种酯化/交联的可能机制以阐明Ca加法和膜性能之间的连接。

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  • 来源
    《RSC Advances》 |2019年第5期|共7页
  • 作者

    Shao Hui; Sun Hui; Yang Biao; Zhang Huijuan; Hu Yu;

  • 作者单位

    Beijing Technol &

    Business Univ Sch Mat Sci &

    Mech Engn Beijing 100048 Peoples R China;

    Beijing Technol &

    Business Univ Sch Mat Sci &

    Mech Engn Beijing 100048 Peoples R China;

    Beijing Technol &

    Business Univ Sch Mat Sci &

    Mech Engn Beijing 100048 Peoples R China;

    Beijing Technol &

    Business Univ Sch Mat Sci &

    Mech Engn Beijing 100048 Peoples R China;

    Beijing Technol &

    Business Univ Sch Mat Sci &

    Mech Engn Beijing 100048 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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