Reinforcement of Self‐Healing Polyacrylic Acid Hydrogel with Acrylamide Modified Microcrystalline Cellulose†,Chinese Journal of Chemistry

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Reinforcement of Self‐Healing Polyacrylic Acid Hydrogel with Acrylamide Modified Microcrystalline Cellulose†
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-28 , DOI: 10.1002/cjoc.201900458
Changzhuang Bai ₁ , Qiuhua Huang ₁ , Xiaopeng Xiong ₁

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Self‐healing hydrogel such as polyacrylic acid (PAA) hydrogel has attracted increasing attention based on its promising potential applications. However, it usually suffers from low strength especially as mechanical device. Herein, a commercial microcrystalline cellulose (MCC) was modified with acrylamide to graft polyacrylamide (PAM) chains on the particle surface. The acrylamide‐modified MCC (AM‐MCC) was then dispersed in monomer solution of acrylic acid to prepare composite hydrogel. The mechanical properties of the obtained composite hydrogels and the self‐healed hydrogels were carefully measured by compressive and tensile tests, and by dynamic mechanical analysis. Our results demonstrate that introduction of a small amount of AM‐MCC such as 3 wt% can not only reinforce the original hydrogel and the healed hydrogel markedly, but also improve self‐healing efficiency obviously. The analyses indicate that in addition to the reversible multi‐interactions such as hydrogen bonding and ionic interactions, the entanglements between the PAA chains of the hydrogel matrix and the PAM chains grafted on the MCC particles have also played an important role on the improvement in mechanical performances and the healing ability of the hydrogel. Moreover, the responsiveness to exterior ion has been tested to indicate potential application of the composite hydrogel as self‐healable sensor.

中文翻译：

丙烯酰胺修饰的微晶纤维素增强自修复聚丙烯酸水凝胶†

自愈水凝胶，例如聚丙烯酸（PAA）水凝胶，由于其潜在的潜在应用而受到越来越多的关注。但是，特别是作为机械装置，通常强度低。本文中，用丙烯酰胺改性商品微晶纤维素（MCC），以在颗粒表面接枝聚丙烯酰胺（PAM）链。然后将丙烯酰胺改性的MCC（AM-MCC）分散在丙烯酸的单体溶液中以制备复合水凝胶。通过压缩和拉伸试验以及动态力学分析，仔细测量了所得复合水凝胶和自修复水凝胶的机械性能。我们的结果表明，引入少量的AM-MCC（例如3 wt％）不仅可以显着增强原始水凝胶和已修复的水凝胶，但也明显提高了自我修复效率。分析表明，除了可逆的多重相互作用（例如氢键和离子相互作用）外，水凝胶基质的PAA链与接枝到MCC颗粒上的PAM链之间的缠结也对改善机械性能起了重要作用。性能和水凝胶的愈合能力。此外，已经测试了对外部离子的响应性，以表明复合水凝胶作为自愈传感器的潜在应用。水凝胶基质的PAA链与接枝在MCC颗粒上的PAM链之间的缠结对改善机械性能和水凝胶的愈合能力也起着重要作用。此外，已经测试了对外部离子的响应性，以表明复合水凝胶作为自愈传感器的潜在应用。水凝胶基质的PAA链与接枝在MCC颗粒上的PAM链之间的缠结对改善机械性能和水凝胶的愈合能力也起着重要作用。此外，已经测试了对外部离子的响应性，以表明复合水凝胶作为自愈传感器的潜在应用。

更新日期：2020-04-22

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