温度响应型海藻酸钙/聚（N-异丙基丙烯酰胺）水凝胶的制备与表征,Polymer International

当前位置： X-MOL 学术 › Polym. Int. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

温度响应型海藻酸钙/聚（N-异丙基丙烯酰胺）水凝胶的制备与表征
Polymer International ( IF 2.9 ) Pub Date : 2022-10-04 , DOI: 10.1002/pi.6464
Qichen Tang ₁ , Shanhua Qian _{1,

2} , Weiwei Chen ₁ , Xiaofei Song ₁ , Jianfeng Huang ₃

Affiliation

聚（N-异丙基丙烯酰胺）（PNIPAm）广泛用于响应性软执行器。但仍存在脆性低、力学性能差的缺陷。此外，很少有人关注管状 PNIPAm 水凝胶的直径收缩变形。^{在这项研究中，Ca 2+}之间的物理交联引入阳离子和海藻酸钠 (SA) 与化学交联的 PNIPAm 形成互穿网络，然后制备海藻酸钙/PNIPAm 水凝胶。表征了分子结构、表面形态、溶胀性能和机械性能。结果表明，热引发聚合得到的纯PNIPAm水凝胶具有较好的溶胀和温度响应性能（最大溶胀率为1134.65%，最快下降率为318.45% min ^-1溶胀率）与使用紫外线聚合的水凝胶相比。Ca/PNIPAm 水凝胶的机械性能得到增强，直到 SA 浓度超过 8 wt%。与纯 PNIPAm 水凝胶（1.42 kPa）相比，SA 浓度为 8 wt%（16.61 kPa）的水凝胶的压缩模量提高了 10 倍，相应的弹性模量提高了 47%。此外，基于环形和管状水凝胶制备了模型软致动器。50℃时具有可逆的缩径行为，具有优异的温度响应性。本文报告的结果为温度响应型 PNIPAm 基水凝胶的工程应用提供了宝贵的见解。© 2022 工业化学学会。

"点击查看英文标题和摘要"

Preparation and characterization of temperature-responsive Ca–alginate/poly(N-isopropylacrylamide) hydrogel

Poly(N-isopropylacrylamide) (PNIPAm) is widely implemented in responsive soft actuators. However, there are still defects of low brittleness and poor mechanical properties. Moreover, little attention has been paid to diameter shrinkage deformation of tubular PNIPAm hydrogels. In this study, physical crosslinking between Ca²⁺ cations and sodium alginate (SA) was introduced to form an interpenetrating network with chemically crosslinked PNIPAm, and then Ca–alginate/PNIPAm hydrogels were prepared. Molecular structure, surface morphology, swelling properties and mechanical properties were characterized. The results indicated that the pure PNIPAm hydrogel obtained using thermal initiation polymerization had better swelling and temperature-responsive properties (with a maximum swelling ratio of 1134.65% and a fastest decrease rate of 318.45% min⁻¹ in swelling ratio) compared to the hydrogel using ultraviolet polymerization. The mechanical properties the Ca/PNIPAm hydrogel were enhanced until the SA concentration exceeded 8 wt%. The compressive modulus of the hydrogel with SA concentration of 8 wt% (16.61 kPa) was increased by 10 times as compared with the pure PNIPAm hydrogel (1.42 kPa), and its corresponding elastic modulus increased by 47%. Moreover, a model soft actuator was prepared based on annular and tubular hydrogels. It had reversible diameter shrinkage behavior at 50 °C, and excellent temperature-responsive property. The results reported herein provide valuable insight into the engineering application of temperature-responsive PNIPAm-based hydrogels. © 2022 Society of Industrial Chemistry.

更新日期：2022-10-04

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南