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Transparent, High-Strength, and Shape Memory Hydrogels from Thermo-Responsive Amino Acid-Derived Vinyl Polymer Networks.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-02-20 , DOI: 10.1002/marc.201900650
Tomoyuki Koga 1 , Kotoha Tomimori 1 , Nobuyuki Higashi 1
Affiliation  

Herein, the formation of unique shape-memory hydrogels that are composed of thermo-responsive amino-acid-derived vinyl polymer networks is reported; these are readily prepared by radical copolymerization of N-acryloyl glycinamide with commercially available cross-linkers, namely, methylenebis(acrylamide) and poly(ethylene glycol) diacrylate. These hydrogels are transparent (>90% transmittance at 600 nm) and are comprised of 97-70 wt% water. Furthermore, these contain both chemical and physical cross-linkages that are based on the multiple hydrogen bonds attained via amino acid units; this composition is aimed at generating opposing stimuli-responsive characters, namely, chemically stable and thermo-sensitive properties. A cooperative interplay of these two networks enables the hydrogels to exhibit a decent mechanical toughness (breaking strength ≈0.3 MPa and breaking elongation >600%) and a shape fix/memory capability. The temporary shape is easily fixed by cooling at 4 °C after deformation at high temperature, and it instantly recovers its original shape through reheating. Furthermore, a multi-shape memory effect is achieved by incorporating the pH-responsive N-acryloyl alanine unit into the hydrogel system as a comonomer; in this system, three distinct shapes can be fixed through temperature and pH manipulations. This facilely attainable shape memory hydrogel has significant potential in various fields, such as soft actuators, sensors, and biomedical materials.

中文翻译:

来自热响应性氨基酸衍生的乙烯基聚合物网络的透明,高强度和形状记忆水凝胶。

本文报道了由热响应性氨基酸衍生的乙烯基聚合物网络组成的独特形状记忆水凝胶的形成;这些可通过N-丙烯酰基甘氨酰胺与可商购获得的交联剂,即亚甲基双(丙烯酰胺)和聚(乙二醇)二丙烯酸酯的自由基共聚而容易地制备。这些水凝胶是透明的(在600 nm处透射率> 90%),由97-70 wt%的水组成。此外,它们包含基于通过氨基酸单元获得的多个氢键的化学和物理交联。该组合物旨在产生相反的刺激响应特性,即化学稳定和热敏特性。这两个网络的相互作用相互作用使水凝胶具有良好的机械韧性(断裂强度≈0.3MPa,断裂伸长率> 600%)和形状固定/记忆能力。高温变形后,通过在4°C下冷却,可以轻松固定临时形状,并通过重新加热立即恢复其原始形状。此外,通过将pH响应性的N-丙烯酰基丙氨酸单元作为共聚单体掺入水凝胶体系中,可以实现多种形状的记忆效果。在该系统中,可以通过控制温度和pH值来固定三个不同的形状。这种易于获得的形状记忆水凝胶在各个领域具有巨大的潜力,例如软致动器,传感器和生物医学材料。高温变形后,通过在4°C下冷却,可以轻松固定临时形状,并通过重新加热立即恢复其原始形状。此外,通过将pH响应性的N-丙烯酰基丙氨酸单元作为共聚单体掺入水凝胶体系中,可以实现多种形状的记忆效果。在该系统中,可以通过控制温度和pH值来固定三个不同的形状。这种易于获得的形状记忆水凝胶在各个领域具有巨大的潜力,例如软致动器,传感器和生物医学材料。高温变形后,通过在4°C下冷却,可以轻松固定临时形状,并通过重新加热立即恢复其原始形状。此外,通过将pH响应性的N-丙烯酰基丙氨酸单元作为共聚单体掺入水凝胶体系中,可以实现多种形状的记忆效果。在该系统中,可以通过控制温度和pH值来固定三个不同的形状。这种易于获得的形状记忆水凝胶在各个领域具有巨大的潜力,例如软致动器,传感器和生物医学材料。在该系统中,可以通过控制温度和pH值来固定三个不同的形状。这种易于获得的形状记忆水凝胶在各个领域具有巨大的潜力,例如软致动器,传感器和生物医学材料。在该系统中,可以通过控制温度和pH值来固定三个不同的形状。这种容易获得的形状记忆水凝胶在各个领域具有巨大的潜力,例如软致动器,传感器和生物医学材料。
更新日期:2020-02-20
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