Aliphatic Polyester/polyhedral Oligomeric Silsesquioxanes Hybrid Networks via Copper‐free 1,3‐dipolar Cycloaddition Click Reaction,Journal of Polymer Science Part A: Polymer Chemistry

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Aliphatic Polyester/polyhedral Oligomeric Silsesquioxanes Hybrid Networks via Copper‐free 1,3‐dipolar Cycloaddition Click Reaction
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2019-09-30 , DOI: 10.1002/pola.29507
Reyhan Ozdogan ₁ , Ozgun Daglar ₂ , Hakan Durmaz ₂ , Mehmet Atilla Tasdelen ₁

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In this study, we describe the preparation and characterization of a new class of thermoset hybrid networks containing aliphatic polyester and polyhedral oligomeric silsesquioxanes (POSS). The copper‐free 1,3‐dipolar cycloaddition click reaction of internal alkyne functionalized aliphatic polyester and multifunctional azido POSS with different concentrations led to highly crosslinked thermoset networks. The click reactions performed under ambient conditions (i.e., in tetrahydrofuran at room temperature for 1 day) in the absence of any catalyst. The chemical composition of hybrid networks and homogenous distribution of POSS molecules were confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy with energy dispersive spectroscopy. The swelling ratios of hybrid networks were commonly decreased by increasing POSS‐N₃ content and by changing polar solvents to apolar solvents. Thermogravimetric analysis results demonstrated that the thermal stability of hybrid networks increased with higher POSS feeding ratio. Tensile tests were applied to evaluate the mechanical properties of hybrid networks. Compared to neat aliphatic polyester, the mechanical properties of hybrid networks significantly improved. For instance, the tensile strength were enhanced from 5 MPa to 19 MPa by increasing the concentration of azido functionalized POSS from 10 to 40. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2222–2227

中文翻译：

通过无铜1,3-偶极环加成点击反应的脂族聚酯/多面体低聚倍半硅氧烷杂化网络

在这项研究中，我们描述了包含脂肪族聚酯和多面体低聚倍半硅氧烷（POSS）的新型热固性混合网络的制备和表征。内部炔烃官能化的脂族聚酯与多功能叠氮基POSS的不同浓度下的无铜1,3-偶极环加成点击反应导致了高度交联的热固性网络。在没有催化剂的情况下，在环境条件下（即，在室温下于四氢呋喃中进行1天）进行点击反应。傅里叶变换红外光谱和能量分散扫描电子显微镜证实了杂化网络的化学组成和POSS分子的均匀分布。通常通过增加POSS‐N来降低混合网络的膨胀率₃含量并通过将极性溶剂改为非极性溶剂。热重分析结果表明，杂化网络的热稳定性随着POSS进料比的增加而增加。拉伸测试用于评估混合网络的机械性能。与纯脂肪族聚酯相比，杂化网络的机械性能显着提高。例如，通过将叠氮基官能化POSS的浓度从10增加到40，将拉伸强度从5 MPa提高到19 MPa。©2019 Wiley Periodicals，Inc. J. Polym。版权所有。科学，A部分：Polym。化学 2019，57，2222年至2227年

更新日期：2019-09-30

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