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Rheological behaviours of guar gum derivatives with hydrophobic unsaturated long-chains

机译：疏水性不饱和长链瓜尔胶衍生物的流变行为

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摘要

Three guar gum derivatives with hydrophobic unsaturated long-chains were successfully synthesized, including oleic guar gum (OGG), linoleic guar gum (LGG) and erucic guar gum (EGG). The guar gum derivatives were characterized by Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). Moreover, comparative studies on the rheological behaviours of guar gum (GG) and three guar gum derivatives were performed. Regardless of their hydrophobic side groups, all sample solutions showed the properties of non-Newtonian shear-thinning fluids, and their complex viscosities (eta*) increased significantly with increasing concentration. In contrast to GG, OGG or EGG, LGG exhibited the strongest shear-thinning property when the concentration is 1 wt%. It was found that the frequency-dependent viscous (G '') and elastic modulus (G ') curves of GG and its derivatives aqueous solutions cross at a specific frequency. This crossover frequency decreases with increasing sample concentration, indicating that the viscoelasticity is highly dependent on polymer concentration. In addition, when the molar substitution (MS) of the repeating sugar units in the guar gum derivatives is less than 0.08, the LGG solution showed more obvious solid-like rheological properties than the OGG and EGG solutions at the same concentration.
机译：成功合成了具有疏水性不饱和长链的三种瓜尔胶衍生物，包括油豚胶（OGG），亚油瓜尔胶（LGG）和MECICIC GUAR GUM（鸡蛋）。瓜尔胶衍生物的特征在于傅里叶变换红外（FTIR）光谱和热重分析（TGA）。此外，对瓜尔胶（GG）和三个瓜尔胶衍生物的流变行为进行比较研究。无论它们的疏水侧组如何，所有样品溶液都显示出非牛顿剪切稀疏流体的性质，并且它们的复杂粘度（ETA *）随着浓度的增加而显着增加。与GG，OGG或鸡蛋相反，当浓度为1wt％时，LGG表现出最强的剪切变薄性能。发现GG及其衍生物水溶液的频率依赖性粘性（G''）和弹性模量（G'）曲线以特定频率交叉。这种交叉频率随着样品浓度的增加而降低，表明粘弹性高度依赖于聚合物浓度。另外，当瓜尔胶衍生物中重复糖单元的摩尔取代（MS）小于0.08时，LGG溶液比同一浓度的OGG和蛋溶液显示出更明显的固体样变性质。

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  • 来源
    《RSC Advances》 |2020年第53期|共8页
  • 作者

    Zhang Minghua; He Jianping; Deng Mingyu; Gong Peixin; Zhang Xi; Fan Minmin; Wang Ke;

  • 作者单位

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

    Jingkun Oilfield Chem Co Kunshan 215300 Peoples R China;

    Jingkun Oilfield Chem Co Kunshan 215300 Peoples R China;

    Jingkun Oilfield Chem Co Kunshan 215300 Peoples R China;

    Sichuan Univ Polymer Res Inst Chengdu 610065 Peoples R China;

    Sichuan Univ Polymer Res Inst Chengdu 610065 Peoples R China;

    Sichuan Univ Polymer Res Inst Chengdu 610065 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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