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首页> 外文期刊>Polymers for advanced technologies >Synthesis and characterization of imidized poly(styrene-maleic anhydride) nanoparticles in stable aqueous dispersion
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Synthesis and characterization of imidized poly(styrene-maleic anhydride) nanoparticles in stable aqueous dispersion

机译：稳定水分散液中酰亚胺化聚（苯乙烯-马来酸酐）纳米粒子的合成与表征

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摘要

Organic nanoparticles are synthesized by partial imidization of high-molecular weight styrene(maleic-anhydride) with 26 to 34 mol% maleic anhydride, in aqueous environment and presence of ammonium hydroxide. The nanoparticle dispersions have a maximum solid content of 35 wt% and good stability that critically depends on the ratio of imidized and ammonolyzed maleic anhydride moieties. The deprotonated residual maleic anhydride moieties provide dispersion stability at pH > 4, while protonation at pH<4 causes nanoparticle sedimentation. After presentation of the synthesis conditions, the imidization reaction is characterized by FT-IR and Raman spectroscopy, followed by thermal analysis (TGA, DSC), and morphological characterization (DLS, SEM, TEM, AFM). The reaction conditions were optimized by physical characterization of various dispersions, and finally nanoparticles could be obtained with a maximum degree of imidization of 77% in dispersed conditions, or 90 to 95% after drying that are favorable for coating applications.
机译：在水性环境中和氢氧化铵存在下，通过将高分子量的苯乙烯（马来酸酐）与26至34摩尔％的马来酸酐部分酰亚胺化来合成有机纳米颗粒。纳米颗粒分散体具有35重量％的最大固体含量和良好的稳定性，该稳定性主要取决于酰亚胺化的和氨解的马来酸酐部分的比例。去质子化的残留马来酸酐部分在pH> 4时提供分散稳定性，而在pH <4时的质子化导致纳米颗粒沉降。提出合成条件后，通过FT-IR和拉曼光谱对酰亚胺化反应进行表征，然后进行热分析（TGA，DSC）和形态表征（DLS，SEM，TEM，AFM）。通过各种分散液的物理表征优化了反应条件，最终在分散条件下获得的亚胺化度最高为77％，在干燥后的酰亚胺化度最高为90％至95％，这对涂料应用是有利的。

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