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No effect of the hydrogen bonds on the physicochemical properties of the guest-host poly(amide imide) azosystems and efficiency of chromophore orientation
Dyes and Pigments ( IF 4.1 ) Pub Date : 2018-04-12 , DOI: 10.1016/j.dyepig.2018.04.017
Jolanta Konieczkowska , Anna Kozanecka-Szmigiel , Henryk Janeczek , Jan Małecki , Magdalena Wójtowicz , Ewa Schab-Balcerzak

In this paper, we show a series of the new noncovalent azosystems based on poly(amide imide) matrices. Azobenzene derivatives were attached to the polymer matrix via hydrogen bonds or formed doped systems. Additionally, glass transition temperatures of azosystems were established by the calculation procedure based on Fox equation. We proved that presence H-bonds between polymer matrix and chromophore does not effect on increase Tg and T5, in comparison to the doped polymers. It was observed that poly(amide imide) matrices are able to the thermally induced intermolecular cross-linking via hydrogen bonds. Functional density theory (DFT) was used to observed both changes in geometry the polymer matrix before and after incorporation of the azo-dyes and H-bonds formation possibility. The presence of H-bonds both intermolecular and between polymer and chromophore was confirmed experimentally by FTIR and 1H NMR spectroscopy. The supramolecular system based on the matrix with pyridine rings in the side chains and 4-[(4-methyl phenyl)diazenyl]phenol was found to show a relatively efficient photo-orientation process. We showed the hydrogen bonds between chromophore and polymer matrix did not provide higher and more stable the photoinduced birefringence in comparison with doped one. It seems that the critical parameter which impacts on values and stability of Δn is azo-dye content.



中文翻译:

氢键对客体-主体聚(酰胺酰亚胺)偶氮系统的理化性质和生色团取向效率没有影响

在本文中,我们展示了一系列基于聚(酰胺酰亚胺)基质的新型非共价偶氮系统。偶氮苯衍生物通过氢键或形成的掺杂体系连接到聚合物基质上。此外,通过基于Fox方程的计算程序确定了偶氮体系的玻璃化转变温度。我们证明了聚合物基体和生色团之间存在氢键不会影响T g和T 5的增加与掺杂的聚合物相比。观察到聚(酰胺酰亚胺)基质能够通过氢键热诱导分子间交联。使用功能密度理论(DFT)来观察引入偶氮染料和氢键形成可能性之前和之后聚合物基体的几何形状变化。FTIR和1通过实验证实了分子间以及高分子与生色团之间存在H键1 H NMR光谱。发现基于在侧链上具有吡啶环和4-[(4-甲基苯基)二氮烯基]苯酚的基质的超分子体系显示出相对有效的光取向过程。我们表明,与掺杂的相比,发色团和聚合物基质之间的氢键不能提供更高和更稳定的光致双折射。似乎影响Δn的值和稳定性的关键参数是偶氮染料含量。

更新日期:2018-04-12
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