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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(04) [April 2005] >
| Title: | Dielectric study of surface modification of linear low density polyethylene treated with chromic acid and sodium carbonate |
| Authors: | Dash, S K
Mishra, K C
Mishra, S N
Swain, B B |
| Keywords: | Relative permittivity
Dielectric loss
Linear low density polyethylene
Polymers |
| Issue Date: | Apr-2005 |
| Publisher: | CSIR |
| IPC Code: | G01R31/12 |
| Abstract: | The relative permittivity
( ') and
dielectric loss ('') of linear low density polyethylene (LLDPE) sample of 60 μm
thickness treated successively with a highly oxidizing environment like chromic
acid of normality N/5 to N/30 for time duration of 0.5 to 12 hr and sodium
carbonate for 24 hr are measured using GRA 650A impedance bridge over 100 Hz to
10 kHz range at 303.16±1K. The N/10 chromic acid treated sample exhibited
increase in values of e¢ (from 3.2 to 4.3) and e¢¢
(from 0.48 to 0.75) relative to the virgin sample at
300 Hz while the rest of the samples recorded reduction. But these chromic acid
treated LLDPE samples being further treated with N/10 sodium carbonate (Na2CO3),
exhibit change in ' and '' values in as much as those for N/10 chromic acid treated sample
drops while that of N/15 chromic acid treated sample increases significantly.
This indicates intense polarization penetrating to reasonable depth of the
surface of the material. The higher value of '
and ''
in N/10 chromic acid treated sample may be due to
intra-molecular three-dimensional network of H-bonding between PE-COOH species.
Attempt is made to explain these features. |
| Page(s): | 287-290 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(04) [April 2005]
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