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温湿度双刺激薄膜PU-PNIPAm的合成及其作为智能窗应用的独立成膜

Synthesis of temperature- and humidity-induced dual stimulation film PU-PNIPAm and its independent film formation as a smart window application.

作者信息

Tian Jing, Jin Chengguo, Wu Xudong, Liao Cong, Xie Jiangping, Luo Yajun

机构信息

Department of Materials and Chemical Engineering, Yibin University Yibin 644007 PR China

出版信息

RSC Adv. 2023 Mar 17;13(13):8923-8933. doi: 10.1039/d2ra08052d. eCollection 2023 Mar 14.

DOI:10.1039/d2ra08052d
PMID:36936840
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10020989/
Abstract

Dynamic windows, which switch between transparent and opaque states as the temperature changes, can be applied in buildings to reduce building energy consumption. Poly(-isopropylacrylamide) (PNIPAm) is the most studied thermochromic hydrogel for climate-resilient smart window applications. In addition to its poor mechanical properties and low reaction rate, the PNIPAm hydrogel must be sandwiched between two pieces of glass to form an interlayer in practical applications. Here, durable PU-PNIPAm copolymers for smart windows were synthesized by reacting the synthesized poly-NIPAm diols with isocyanate (-NCO) monomer, which greatly improved the mechanical properties of the hydrogel and it was able to form a film alone. These temperature-sensitive films can switch between transparent (>80% transmittance) and opaque (<5% transmittance) states in less than 10 minutes, with no degradation in optical contrast, switching speed, or uniformity after at least 100 switching cycles.

摘要

动态窗户可随温度变化在透明和不透明状态之间切换，可应用于建筑物以降低建筑能耗。聚（N-异丙基丙烯酰胺）（PNIPAm）是用于气候适应型智能窗户应用研究最多的热致变色水凝胶。除了机械性能差和反应速率低之外，PNIPAm水凝胶在实际应用中必须夹在两片玻璃之间以形成中间层。在此，通过使合成的聚NIPAm二醇与异氰酸酯（-NCO）单体反应，合成了用于智能窗户的耐用PU-PNIPAm共聚物，这大大提高了水凝胶的机械性能，并且它能够单独形成薄膜。这些温度敏感薄膜可在不到10分钟的时间内在透明（透光率>80%）和不透明（透光率<5%）状态之间切换，在至少100次切换循环后，光学对比度、切换速度或均匀性均无下降。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/84749a7af700/d2ra08052d-f10.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/e1c80b69e251/d2ra08052d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/84749a7af700/d2ra08052d-f10.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/3130625e0bf5/d2ra08052d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/6c6eb0789748/d2ra08052d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/805c529bd095/d2ra08052d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/e1c80b69e251/d2ra08052d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/14d8/10020989/84749a7af700/d2ra08052d-f10.jpg

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