مقاله انگلیسی رایگان در مورد نانو کامپوزیت های پلیمر – سیلیکات – الزویر 2021

Abstract

Keywords

1. Introduction

2. Experimental methods

3. Results and discussion

4. Conclusions

Declaration of Competing Interest

Acknowledgements

References

Further Reading

Abstract

Strontium silicate nanoparticles were filled in the organic matrix of poly ethylene glycol, polyvinyl alcohol and polyvinyl pyrrolidone polymers. Different weight percentages were selected for the preparation of thin films on the glass substrate using spin coating technique. Prepared polymer nanocomposite films were characterized for their structural analysis and compositional details using powder X-ray diffraction. Amorphous polymer films with intense diffraction peaks at around 43.8° and 73° exhibited the crystalline phase when doped with strontium silicate in polymer blend matrix. Structural information shows the stable existence of crystalline nanoparticles in the polymer matrix. Dielectric and electrical properties of these samples were studied in the frequency range from 100 Hz to 5500 Hz. Dielectric constant decreased with increase in frequency and changed to different values based on the loading of different weight percentage of nanoparticles. With increase in frequency, the dipolar ordering of polymer-polymer decreased and strengthens the polymer-nanoparticles interaction. Polyvinyl alcohol with 3- wt% of poly ethylene glycol showed the low dielectric constant and dielectric loss as less than 0.03 confirms their improved dielectric properties. Hence, this composition can be used as a better insulating polymeric nanodielectric material which finds application in packaging of nanoscale electronic devises to have better electromagnetic shielding.

1. Introduction

There is a huge demand for the Multifunctional materials to meet the fast growing technological needs [1–7] Silicates (SiO2) based nanomaterials (NMs) [8–10] have showed better role in the fields of optoelectronics [11,12], electrical insulation [13,14], advance battery [15,16], and fuel cells [17] applications because of their physical and chemical stability. Further, silicates are cheap and available in enormous; further in nano-regime, different properties exhibited were because of increased surface to volume ratio and the quantum confinement effects. Because of their ability to convert near IR-light into strong visible light [18], they can be used in phosphor based lamps [19], Solar cells [20], Biological imaging and Medical-Dosimetry [21]. Thin films of nanocomposites (NCs) blended with both organic and inorganic compounds are in demand for the effective insulation of small-scale devices during packaging. Inorganic and organic materials based polymer nanocomposite (PNC) films where the polymer matrix filled with NMs significantly changes the strength, morphology etc helps in tailoring the various requirements in the fields of automobile, coatings, packaging materials, electronics and optical devices, aerospace, EMI shielding, drug delivery, sensors, medical and consumer devices etc. [22].