苯乙烯/己烯在高压釜中的自由基乳液共聚:合成与性能评估

IF 2.7 3区 化学 Q2 POLYMER SCIENCE Journal of Applied Polymer Science Pub Date : 2024-09-04 DOI:10.1002/app.56194
Sanjay Remanan, Mamdouh Ahmed Al-Harthi
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引用次数: 0

摘要

利用自由基乳液聚合法合成了一种基于苯乙烯和 1-己烯的共聚物。反应压力对共聚物的形成有重要影响。苯乙烯与 1- 己烯在较低压力(1 巴)下共聚时会发生相分离,而在加压反应(4.5 巴)下则可观察到稳定的乳液。此外,在较低的反应 pH 值(7.2)下也观察到了相分离现象,共聚结束时 pH 值的降低也证明了这一点。H1 核磁共振(NMR)光谱分析显示,共聚反应后苯乙烯和 1-己烯中的亚甲基质子峰强度消失,表明乳液中单体的转化率提高。还利用 C13 NMR 分析对合成的共聚物进行了研究。傅立叶变换红外光谱(FT-IR)和 X 射线光电子能谱(XPS)对其进行了进一步分析。乳液在酸和温度的协同作用下变得不稳定,从而回收了固体聚合物。通过与商用 PS 混合,研究了共聚物作为聚合物改性剂的适用性。通过差示扫描量热法(DSC)和热重分析法(TGA)分析了共聚物的热性能。本研究还考察了乳液粒度、液滴形态和 pH 值影响等其他特性。
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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Free-radical emulsion copolymerization of styrene/1-hexene in an autoclave: Synthesis and property evaluation

A copolymer based on styrene and 1-hexene was synthesized using free-radical emulsion polymerization. Reaction pressure has a significant influence on copolymer formation. There was a phase separation when styrene was copolymerized with 1-hexene at lower pressure (1 bar) and a stable emulsion was observed under a pressurized reaction (4.5 bar). Additionally, a phase separation was also observed at a lower reaction pH (7.2) and was evidenced by the reduced pH value at the end of the copolymerization. H1 nuclear magnetic resonance (NMR) spectroscopy analysis showed the disappearance of methylene proton peak intensities in both styrene and 1-hexene after the copolymerization reaction indicating the increased conversion of monomers in emulsion. Synthesized copolymer was also studied using the C13 NMR analysis. It was further analyzed by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The emulsion was destabilized by the synergistic action of acid and temperature to recover solid polymer. The applicability of the copolymer as a polymer modifier was studied by blending with commercial PS. Copolymer thermal properties were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Other properties such as emulsion particle size, droplet morphology, and the effect of pH were also investigated in this study.

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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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