Resonance Frequency, Bandwidth and Quality factor of Varying Grades of Poly

Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

Resonance Frequency, Bandwidth and Quality factor of Varying Grades of Poly (Tetrafluroethylene) Films15 Shantanu Dixit1, E. Dhanumalayan1, J. Anandraj1, Mayank Pandey1, Girish M. Joshi1, a, N. Madhusudhana Rao2, S. Kaleemulla2, D.J. Shirale3, M. Teresa Cuberes4 1

Center for Crystal Growth, Polymer Nanocomposite Laboratory, VIT University, Veloore-6320214, TN, India

2

Center for Crystal Growth, Thin film Laboratory, VIT University, Vellore-632014, Tamilnadu, India

3

Department of Electronics, School of Physical Sciences, North Maharashtra University, Jalgaon

4

Laboratory of Nanotechnology, University of Castilla-La Mancha, Plaza Man

a

varadgm@gmail.com

42500, India

DOI 10.2412/mmse.29.22.320 provided by Seo4U.link

Keywords: PTFE,Q-factor, resonance frequency, bandwidth.

ABSTRACT. Poly (terafluroethylene) commercially known as Teflon. The varying grades of PTFE demonstrate interesting electrical properties. In the present investigation, we have measured the resonance frequency (fo), bandwidth, and quality (Q) factor as a function of varying grades of PTFE films with impedance analyzer. The magnitude of resonance frequency (50 Hz to 19 MHz), bandwidth (19-50MHz) and quality factor (900, 500 and 2.8) varies grade wise. All the parameters were independent of temperature. under broadband frequency. This investigation feasible for the selection of specific grade of PTFE for the microelectronics and electromagnetic shield coating applications.

Introduction. In the present era of an engineering thermoplastics and polymers were highly crucial for domestic and industrial, space, defense and atomic energy domains. [1]. Polytetrafluoroethylene (ptfe), polyvinylidene fluoride (ptfe) belongs to the class of fuloro polymers belongs to the class of an engineering thermoplastic. Commercially PTFE known as the Teflon. It was widely used for the coating,, medical and engineering applications due to low surface energy enable to achieve the barrier property, best thermal, tensile strength, good dielectric property [2] motivates to select the varying grades of ptfe films for the present work.

The processing temperature and recasting methods were influenced over the properties of different grades of PTFE. It was classified based on the criteria of operating temperature, different nature of form solid, liquid or powder product. Coating of nonporous membrane sustain at 2500C. The higher toughness nonstick coating have domestic and industrial application suitable to the temperature range of 2600C Teflon of water based liquid performs better at 2600C. The adhesion and abrasion resistance were improved with the help of Teflon. It was the choice of engineering material community to test the solvent based lubrication property at higher temperature and pressure criteria. It excites that varying grades of PTFE exhibit interested properties and suitable for the various application.

However, previously we demonstrated the molecular weight co-related dielectric properties of polymers [3].

We motivated to investigate the resonance frequency (fo), bandwidth (BW) and quality (Q) factor of varying grades of PTFE. Generally, reports on dielectric constant, loss, impedance were reported for in view of electrical properties of polymers, composites, blends. However, for implantation of

Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/

MMSE Journal. Open Access www.mmse.xyz

91

Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

electromagnetic interface property in electronic gazettes present investigation suggests to select the perfect PTFE grade.

Materails and Exprimentals. Three different grades (15-5f-1, 15-5f-2, 32-5f-1) of ptfe films with linois, USA. Electrical properties were tested by using impedance analyzer make: n-4l, uk connected with fixture assembly to impedance analyzer interfacing device. The across the broadband frequency ( 50 hz to 35 Mhz) and temperature (30 150 0C).

Resonance frequency, Bandwidth and Quality factor of varying grades of PTFE films The resonance frequency is the circuit reactance in the inductance or capacitance form. It may be both tested as function of frequency dispersion. It is co-related to the Q-factor. However, Q-factor is defined as the ratio of energy restored in capacitive or reactive per unit cycle of energy loss was equal to the reactance divided by resistance. The bandwidth is mean difference of resonance frequency.

We have tested samples using an impedance analyzer as function of broadband frequency (50Hz to 35 MHz) and temperature 30 to 150 oC. The grades 15-5F-1and 2 is feasible to use it as the better coating medium for electromagnetic shield applications. The physico-chemical properties of PTFE depend on the fabrication conditions.

1000

30 40 50 60 70 80 90 100 110 120 130 140 150

800

600

400

200

0

50

100 500 1 K 10 K 50 K 100 K500 K 1 M 10 M 20 M 30 M 35 M

Frequency (Hz)

a) 600

500

30 40 50 60 70 80 90 100 110 120 130 140 150

2.6 2.4 2.2

Q-factor

30 40 50 60 70 80 90 100 110 120 130 140 150

550

3.0 2.8

2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6

450 400 350 300 250 200 150 100

0.4 0.2 0.0 -0.2

50 0 -50

50

100 500

50

1 K 10 K 50 K 100 K500 K 1 M 10 M 20 M 30 M 35 M

100

500

1 K 10 K 50 K 100 K500 K 1 M 10 M 20 M 30 M 35 M

Frequency (Hz)

Frequency (Hz)

b)

c)

Fig. 1. Q-factor as function temperatures across broad band frequency a) 15-5F-1, b) 15-5F-2, c) 32-5F-1 varying grades of PTFE films.

The Q- factor is evaluated by using the following relation, which is the ratio of energy stored and lost per unit cycle operated across the sample under test.

MMSE Journal. Open Access www.mmse.xyz

92

Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

Q = 2 (Max instantaneous energy stored/Energy dissipated per cycle) i) Higher magnitude of Q-factor is the dispersion of broadband frequency. The over damped, under damped and critically damped mechanism co-related to the low, high and intermediate magnitude of q-factor. It was demonstrated in Fig.1 a-c) Q factor of varying grades (15-5F-1,2 and32-5F-1) of PTFE films. The resonance frequency varies from grade to grade and shown effect on the bandwidth.

The grade wise variation on Q-factor magnitude varies shown in Fig.2. The Q-factor was based on the principle of LCR circuit tuned to radio frequency (in the shunt mode operation) as resonator restricting the resistance of the inductor and narrowing the bandwidth [4-5].

Table 1. Comparative values of Q-factor, resonance frequency (f0), bandwidth of varying grades of PTFE films.

PTFE grades

Q-factor

Resonance frequency (Hz)

Bandwidth (Hz)

15-5F-1

900

10 MHz

19 MHz

15-5F-2

500

50 MHz

50 MHz

32-5F-1

2.8

10 MHz

19 MHz

1000

800

600

400

200

0 I

II

III

Varying grades of PTFE

FIG. 2. Q factor as a function of varying grades of PTFE. Summary. In the present investigated we were mainly focused the evaluation of resonance frequency, bandwidth and Q-factor as function of varying grades of PTFE. We found the Q-factor magnitude decreases relative resonance frequency. The bandwidth influences grade wise. This investigation suggests to select the specific grades of PTFE for microelectronic and EMI Teflon coating application.

Acknowledgments.

Dr.D.J. Shiale would like to express special thanks to the DST Young Scientist (YS) Scheme Ref: SR/FTP/PS-041/2012, New Delhi, India Dr.Girish M. Joshi would like to thanks Naval Research Board, NRB, DRDO, India, new Delhi for availing the existed facilities under the project No.256/Mat./11-12.

MMSE Journal. Open Access www.mmse.xyz

93

Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

References J. G. Drobny, 2014 , Technology of Fluropoly, CRC Press, Taylor & Francis Group, LLC, ISBN -13: 978-1-4200-6317-2.

Q. Wang, F. Zheng, T. Wang, 2016, Tribological properties of polymers PI, PTFE and PEEK at cryogenic temperature in vacuum, Cryogenics, 75, 19-25., DOI 10.1016/j.cryogenics.2016.01.001 O. Omelianovych, V.D. Dao, L. L. Larina, H.S, Choi, 2016, Optimization of the PtFe alloy structure for application as an efficient counter electrode for dye-sensitized solar cells, Electrochmica Acta, 211, pp. 842-850, DOI 10.1016/j.electacta.2016.06.094 M. Khutia, G.M. Joshi, P.Tambe, 2016, Quality factor of Melt blend processed polypropylene/poly (acrylonitrile-butadiene-styrene)/conducting carbon black blends, Int.J. Plast. Tech 2916. 19:2, 381387.

L. Wang, J. Liu, S. Li, X., 2016, Zhang, Materials & Design, Vol. 92, pp. 397-404. , Vol 9.

MMSE Journal. Open Access www.mmse.xyz

94