Abstract

In this work, preparation and characterization of new classes of polybutadiene-based polyols and polyurethanes investigated with consecutive reactions namely, polybutadiene chain scission by a two- step oxidation procedure using meta-chloroperbenzoic acid and periodic acid to prepare terminal aldehyde functionalized polybutadiene, followed by telechelic amine polyol preparation by an amination reaction using diethanolamine finally telechelic polyurethane synthesis by the reaction of synthesized polyol and toluene diisocyanate. Magnetic nanocomposites were synthesized during an in-situ polymerization reaction by incorporation of 1 to 3 wt % of Fe₃O₄ surface modified nanoparticles by aminopropyltriethoxysilane. ¹H NMR and FT-IR spectroscopy techniques proved successful synthesis of polymer binder, polyurethane and nanocomposites. TEM micrographs and XRD patterns indicated homogeneous nanoparticle distribution, almost constant nanoparticle size and lack of agglomeration. TGA/DTG analysis proved significant thermal stabilities with slower degradation rates especially in 3 wt % nanocomposite. VSM hysteresis confirmed superparamagnetic behavior of the magnetic nanocomposites that increased with higher nano Fe₃O₄@APTS content.

中文翻译：

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由功能化聚丁二烯制备的热稳定磁性聚氨酯纳米复合材料：聚丁二烯化学改性的新方法

摘要

在这项工作中，使用间氯过苯甲酸和高碘酸通过两步氧化程序使聚丁二烯断链以制备末端醛官能化聚丁二烯，然后通过连续反应研究了新型聚丁二烯基多元醇和聚氨酯的制备和表征。遥爪胺多元醇由二乙醇胺胺化反应制备，最后由合成的多元醇与甲苯二异氰酸酯反应合成遥爪聚氨酯。磁性纳米复合材料是在原位聚合反应过程中通过氨基丙基三乙氧基硅烷掺入 1 至 3 重量％的 Fe ₃ O ₄表面改性纳米颗粒来合成的。¹H NMR 和 FT-IR 光谱技术证明了聚合物粘合剂、聚氨酯和纳米复合材料的成功合成。TEM 显微照片和 XRD 图案表明纳米颗粒分布均匀，纳米颗粒尺寸几乎恒定并且没有团聚。TGA/DTG 分析证明了显着的热稳定性和较慢的降解速率，尤其是在 3 wt % 纳米复合材料中。VSM 磁滞证实了磁性纳米复合材料的超顺磁性行为，随着纳米 Fe ₃ O ₄ @APTS 含量的增加而增加。