Synthesis and characterization of new quinolinyl phenol based polybenzoxazine: thermal stability, hydrophobicity and corrosion resistant properties

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization Pub Date : 2023-01-01 DOI:10.1080/1023666X.2022.2143758

Roja Chinnamuthu , Priyanka Madesh , Hariharan Arumugam , Balaji Krishnasamy , Latha Govindraj , Mallika Jaganathan , Alagar Muthukaruppan

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引用次数: 0

Abstract

A new class of quinolinyl phenol-based benzoxazines (QP-a, QP-cha, QP-2eha) were synthesized by using quinolinyl phenol [4-(6-chloro-4-phenylquinoline-2-yl)phenol] with three structurally distinct amines, namely aniline (a), cyclohexylamine (cha), and 2-ethylhexylamine (2eha) through Mannich condensation reaction using an appropriate solvent and reaction conditions. By using FTIR and ¹H-NMR spectroscopy methods, the molecular structures of the benzoxazines QP-a, QP-cha, and QP-2eha were identified. From the differential scanning calorimetry (DSC) analysis, the exothermic peak maximum of benzoxazine monomers viz., QP-a, QP-cha, QP-2eha were observed at 218, 202 and 187 °C respectively. The thermogram obtained from TGA studies the amount of char yield obtained for poly(QP-a), poly(QP-cha) and poly(QP-2eha) were found to be 45, 24, and 32%, respectively. The value of limiting oxygen index (LOI) for polybenzoxazines was calculated using the value of percentage char yield obtained from TGA studies infer that these benzoxazines exhibit good flame-retardant characteristics. Data from water contact angle studies ascertain that these samples possess good hydrophobic properties in the range of 129–138°. Results from corrosion studies infer that the mild steel specimens coated with these benzoxazines were found to be more stable and offer better surface protection against corrosion under the conditions studied.

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新型喹啉酚基聚苯并恶嗪的合成与表征:热稳定性、疏水性和耐腐蚀性

以喹啉基苯酚[4-（6-氯-4-苯基喹啉-2-基）苯酚]和苯胺（A）、环己胺（cha）和2-乙基己胺（2eha）三种结构不同的胺为原料，在适当的溶剂和反应条件下，通过Mannich缩合反应合成了一类新的喹啉基酚基苯并恶嗪（QP-A，QP-cha，QP-2eha）。利用红外光谱和核磁共振氢谱对苯并恶嗪类化合物QP-a、QP-cha和QP-2eha的分子结构进行了鉴定。根据差示扫描量热法（DSC）分析，苯并恶嗪单体QP-a、QP-cha、QP-2eha的放热峰最大值分别在218、202和187°C下观察到。从TGA研究中获得的热谱图发现，聚（QP-a）、聚（QP-cha）和聚（QP-2eha）获得的焦炭产率分别为45%、24%和32%。使用从TGA研究获得的焦炭产率百分比值来计算聚苯并恶嗪的极限氧指数（LOI）值，推断这些苯并恶嗪表现出良好的阻燃特性。水接触角研究的数据表明，这些样品在129–138°范围内具有良好的疏水性能。腐蚀研究的结果表明，在所研究的条件下，涂有这些苯并恶嗪的软钢试样更稳定，并提供更好的表面防腐保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Polymer Analysis and Characterization 化学-高分子科学

CiteScore

3.50

自引率

5.30%

发文量

审稿时长

1.6 months

期刊介绍： The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.