Preparation, vibrational structure and dielectric properties studies of cotton linter and its derivatives

Preparation of unhydrolyzed and hydrolyzed cotton linters as well as their derivatives (carboxylate, phosphate and phosphosulphonate), vibrational structure and dielectric properties were studied in this work. The vibrational modes were analyzed by FTIR spectroscopy and the band at 1730 cm−1 in the carboxylation of unhydrolyzed and hydrolyzed was appeared due to introduce of carboxylic group. The new bands appeared at 1208 and 1400 cm−1 in the phosphorylation and phosphosulphonation assigned to C–O–P and C–O–S, respectively. The data indicated that, new chemical structure for the derivatives of unhydrolyzed and hydrolyzed cotton linter was formed. The crystallinity index (CrI) was measured from absorbance ratio of the band 1428 and 900 cm−1. The real part of dielectric constant (ε′) and AC electrical conductivity was studied in the temperature range (295–375 K) at two different frequencies, 800 and 2000 kHz. The ε′ was decreased with increasing frequency due to dispersion. The frequency–temperature dependent conductivity and mechanisms of the electronic conduction were discussed.