In this study, the monomer N–(ethyl–4–hydroxyphenyl)maleimide (TyHPMI) was synthesized from tyramine and maleic anhydride. Subsequently, free radical copolymerization was used to prepare the poly(S–alt–TyHPMI) alternating copolymer by reacting TyHPMI with styrene. We confirmed the chemical structure using Fourier transform infrared (FTIR), 1H and 13C nuclear magnetic resonance (NMR). The sequence distribution of the poly(S–alt–TyHPMI) alternating copolymer was analyzed using mass–analyzed laser desorption ionization/time–of–flight (MALDI–TOF) mass spectrometry. Differential scanning calorimetry (DSC) measurements showed a single glass transition temperature (Tg) across various weight fractions of binary blended systems containing strong hydrogen–bonded acceptors, such as poly(S–alt–TyHPMI)/poly(4–vinyl pyridine) (P4VP) and poly(vinyl pyrrolidone) PVP, implying full miscibility. The Tg values predicted by kwei equation for the poly(S–alt–TyHPMI)/P4VP and poly(S–alt–TyHPMI)/PVP blends show a positive deviation from linearity. This deviation is due to the short alkyl chain reinforcing the addition of acidic TyHPMI units, which enhances intermolecular hydrogen bonding between the pyridyl or C=O groups and the OH units of the TyHPMI segment. As a result, FTIR spectral analyses indicate that the intermolecular hydrogen bonding between pyridyl and C=O groups is stronger in the poly(S–alt–TyHPMI) copolymer compared to the poly(S–alt–HPMI) copolymer. This is supported by the larger ratio of the inter/self-association equilibrium constant (KA/KB) value.

中文翻译：

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聚（苯乙烯-alt-N-（乙基-4-羟苯基）马来酰亚胺）共聚物的设计和介导氢键强度，以增强与氢键受体均聚物的混溶性


在这项研究中，单体N-(乙基-4-羟苯基)马来酰亚胺(TyHPMI)是由酪胺和马来酸酐合成的。随后，通过自由基共聚，TyHPMI 与苯乙烯反应制备了聚（S-alt-TyHPMI）交替共聚物。我们使用傅里叶变换红外（FTIR）、1H和13C核磁共振（NMR）确认了化学结构。使用质量分析激光解吸电离/飞行时间（MALDI-TOF）质谱法分析聚（S-alt-TyHPMI）交替共聚物的序列分布。差示扫描量热法 (DSC) 测量显示，含有强氢键受体的二元混合体系的不同重量分数具有单一玻璃化转变温度 (Tg)，例如聚(S-alt-TyHPMI)/聚(4-乙烯基吡啶)（ P4VP）和聚（乙烯基吡咯烷酮）PVP，意味着完全混溶。由 kwei 方程预测的聚（S–alt–TyHPMI）/P4VP 和聚（S–alt–TyHPMI）/PVP 共混物的 Tg 值显示出与线性的正偏差。这种偏差是由于短烷基链增强了酸性TyHPMI单元的添加，从而增强了吡啶基或C=O基团与TyHPMI链段的OH单元之间的分子间氢键。结果，FTIR光谱分析表明，与聚(S-alt-HPMI)共聚物相比，聚(S-alt-TyHPMI)共聚物中吡啶基和C=O基团之间的分子间氢键更强。较大的相互/自缔合平衡常数 (KA/KB) 值比率支持了这一点。