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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of clay-dispersed poly(styrene-co-methyl methacrylate) nanocomposite via miniemulsion atom transfer radical polymerization: A reverse approach
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Synthesis of clay-dispersed poly(styrene-co-methyl methacrylate) nanocomposite via miniemulsion atom transfer radical polymerization: A reverse approach

机译：细乳液原子转移自由基聚合合成粘土分散的聚苯乙烯-甲基丙烯酸甲酯共​​聚物纳米复合材料：反向方法

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摘要

Poly(styrene-co-methyl methacrylate) nanocomposites were synthesized using reverse atom transfer radical polymerization (RATRP) in miniemulsion. Cetyltrimethylammonium bromide (CTAB) as a cationic surfactant applicable at higher temperatures was used for miniemulsion stabilization. Successful RATRP was carried out by using 4,4′-dinonyl-2,2′-bipyridine (dNbPy) as ligand. Monodispersed droplets and particles with sizes in the range of 200 nm were revealed by dynamic light scattering (DLS). Conversion and molecular weight study was carried out using gravimetry and size exclusion chromatography (SEC) respectively. By adding clay content, a decrease in the conversion and molecular weight and an increase in the PDI value of the nanocomposites are observed. Thermal stability of the nanocomposites in comparison with the neat copolymer is revealed by thermogravimetric analysis (TGA). Increased T _g values by adding clay content was also obtained using differential scanning calorimetry (DSC). Scanning electron microscopy (SEM) images of the nanoconposite with 1 wt % of nanoclay loading, display monodispersed spherical particles with sizes in the range of ～ 200 nm. SEM findings are more compiled with dynamic light scattering (DLS) results. Well-dispersed exfoliated clay layers in the polymer matrix of the nanocomposite with 1 wt % nanoclay loading is confirmed by transmission electron microscopy (TEM) images and X-ray diffraction (XRD) data.
机译：使用反向原子转移自由基聚合（RATRP）在细乳液中合成了聚（苯乙烯-甲基丙烯酸甲酯共​​聚物）纳米复合材料。十六烷基三甲基溴化铵（CTAB）作为可在较高温度下使用的阳离子表面活性剂，用于稳定细乳液。通过使用4,4'-二壬基-2,2'-联吡啶（dNbPy）作为配体进行成功的RATRP。通过动态光散射（DLS）揭示了大小为200 nm的单分散液滴和颗粒。分别使用重量分析法和尺寸排阻色谱法（SEC）进行转化率和分子量研究。通过添加粘土含量，观察到纳米复合材料的转化率和分子量降低以及PDI值增加。通过热重分析（TGA）揭示了与纯共聚物相比的纳米复合材料的热稳定性。通过使用差示扫描量热法（DSC）也获得通过增加粘土含量而增加的T_g值。纳米复合材料的负载量为1 wt％的纳米复合材料的扫描电子显微镜（SEM）图像显示尺寸为〜200 nm的单分散球形颗粒。扫描电镜的发现与动态光散射（DLS）结果更加一致。通过透射电子显微镜（TEM）图像和X射线衍射（XRD）数据证实了在纳米复合材料的聚合物基质中具有1重量％纳米粘土负载的分散良好的剥离粘土层。

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