Ruiz-Cañas María C, Quintero Henderson I, Corredor Laura M, Manrique Eduardo, Romero Bohórquez Arnold R
Grupo de Investigación en Química Estructural, Parque Tecnológico Guatiguará, Universidad Industrial de Santander, A.A. 678, Piedecuesta 681011, Colombia.
Instituto Colombiano del Petróleo, ECOPETROL S.A., Piedecuesta 681011, Colombia.
Polymers (Basel). 2020 May 18;12(5):1152. doi: 10.3390/polym12051152.
In this study, a set of advanced characterization techniques were used to evaluate the morphological, structural, and thermal properties of a novel molecular hybrid based on silica nanoparticles/hydrolyzed polyacrylamide (CSNH-PC1), which was efficiently obtained using a two-step synthetic pathway. The morphology of the nanohybrid CSNH-PC1 was determined using scanning electron microscopy (SEM), dynamic light scattering (DLS), and nanotracking analysis (NTA) techniques. The presence of C, N, O, and Si atoms in the nanohybrid structure was verified using electron dispersive scanning (EDS). Moreover, the corresponding structural analysis was complemented using powder X-ray diffraction (XRD) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FT-IR). The covalent bond between APTES-functionalized SiO nanoparticles (nSiO-APTES), and the hydrolyzed polyacrylamide (HPAM) chain (MW ≈ 20.10 Da) was confirmed with high-resolution X-ray spectroscopy (XPS). Finally, the thermal properties of the nanohybrid were evaluated by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results showed that the CSNH-PC1 has a spherical morphology, with sizes between 420-480 nm and higher thermal resistance compared to HPAM polymers without modification, with a glass transition temperature of 360 °C. The integration of these advanced characterization techniques implemented here shows promising results for the study and evaluation of new nanomaterials with multiple applications.
在本研究中，使用了一系列先进的表征技术来评估基于二氧化硅纳米颗粒/水解聚丙烯酰胺（CSNH-PC1）的新型分子杂化物的形态、结构和热性能，该杂化物通过两步合成途径高效获得。使用扫描电子显微镜（SEM）、动态光散射（DLS）和纳米追踪分析（NTA）技术确定了纳米杂化物CSNH-PC1的形态。使用电子色散扫描（EDS）验证了纳米杂化物结构中C、N、O和Si原子的存在。此外，使用粉末X射线衍射（XRD）和衰减全反射傅里叶变换红外光谱（ATR-FT-IR）对相应的结构分析进行了补充。通过高分辨率X射线光谱（XPS）证实了APTES功能化的SiO纳米颗粒（nSiO-APTES）与水解聚丙烯酰胺（HPAM）链（分子量≈20.10 Da）之间的共价键。最后，使用热重分析（TGA）和差示扫描量热法（DSC）评估了纳米杂化物的热性能。结果表明，CSNH-PC1具有球形形态，尺寸在420-480 nm之间，与未改性的HPAM聚合物相比具有更高的热阻，玻璃化转变温度为360℃。这里实施的这些先进表征技术的整合为研究和评估具有多种应用的新型纳米材料显示出了有前景的结果。
