Optimization of structural and dielectric properties of CdSe loaded poly(diallyl dimethyl ammonium chloride) polymer in a desired frequency and temperature window

Abstract

In the present paper, investigations of CdSe loaded poly(diallyl dimethyl ammonium chloride) (PDADMAC) nanocomposites and pure PDADMAC synthesized by wet chemical technique have been carried out. Fourier transform infrared and X-ray diffraction analysis have been performed to reveal the structural details of pure polymer and polymer nanocomposite (PNC). The dielectric behavior of pure polymer and PNC has been recorded, which results in higher value of the real and imaginary part of dielectric constant for PNC, as compared with pure PDADMAC. The increase is attributed to the addition of CdSe quantum dots to the pure polymer. The contribution of ionic and electronic polarization has been observed at higher frequency. The theoretical fitting of Cole-Cole function to the experimental data of dielectric constant of PNC and pure PDADMAC results in the determination of relaxation time and conductivity of space charge carriers. The CdSe loaded polymer nanocomposite has been used as an electrolyte in the battery fabrication with configuration Al/PNC/Ag2O. The ac conductivity measurements have been carried out for both samples in a frequency window of 1 kHz–5 MHz and at different temperatures varying from 298 K to 523 K. Activation energy (Ea) has been determined for pure polymer as well as PNC and is found to be less for PNC, as compared with pure polymer. Further, impedance measurement at different temperatures results in two frequency ranges corresponding to ionic conduction and blocking electrode effect. The value of bulk resistance for pure polymer and PNC has been found to be 3660 Ω and 442 Ω, respectively, at 298 K temperature. Electric modulus has been determined and is observed to support the dielectric constant data; it further reveals the deviation from Debye behavior at a higher frequency.

Determination of SLES in Personal Care Products by Colloid Titration with Light Reflection Measurements

“…XRD pattern of polyDADMAC contains two strong peaks at 2 theta angles equal to 31.35 and 45.14 degrees ( Figure 2 ). These peaks are in full agreement with the literature data [ 24 , 25 ]. The diffractogram of polyDADMAC ( Figure 2 ) also reveals bumps at 16.15, 21.4 and 27.1 degrees, which are difficult to ascribe.…”

Influence of Silver Oxide Nanoparticles in the Enhancement of Electrochemical Properties of Binary Polymer Nanocomposite PTh-nAg2O

“…Since the spur should be vertical for an ideal capacitance, the Rct value of the binary polymer nanocomposite (PTh-nAg 2 O) nanocomposite corresponds to the lowest frequency region relative to PTh. [45,46]. In comparison to PTh and other nanocomposites, the Rct value of the binary polymer nanocomposite (PTh-nAg 2 O) is in the region of the lowest frequency.…”

CdSe QDs reinforced poly(1, 8 diaminonaphthalene) (PDAN) offers improved thermal and AC conductivity properties

“…'n' is an exponent which is frequency dependent. Tyagi and Shrma [10] have also used the same law for conductivity measurements of CdSe loaded poly(diallyl dimethyl ammonium chloride) (PDADMAC) polymer. It is reported in literature that in conducting polymer, PDAN, polarons are responsible for conduction.…”

“…At higher frequency the AC conductivity increases due to inter and intra chain hopping of charge carriers (polaron/bipolaron). The enhanced conductivity shows that these nanocomposites can be used for charge storage applications [10,41]. (12) σ ac (ω) = Aω n (13) σ AC = G( ) * t A…”

“…The ultimate properties of nanocomposites greatly depend on the factors such as chemical nature of the polymer matrix and the filler being dispersed, particles size and size distribution of the filler, interactions between the polymer and filler, state of dispersion of the filler, molecular weight of the polymer, and method of fabrication of the nanocomposite. By precise manipulation of these factors one can desirably achieve the polymer nanocomposite of required properties for intended end applications [9][10][11][12].…”