Physical and Electrical Properties of Chlorophyllin/Carboxymethyl Chitin and Chlorophyllin/Carboxymethyl Chitosan Blend Films

Abstract

Blend films consisting of chlorophyllin dispersed in carboxymethyl chitin (CM‐chitin) and carboxymethyl chitosan (CM‐chitosan) were prepared by solution casting and characterized for their physical and electrical properties. Homogeneous films were obtained having chlorophyllin content up to 50 wt% in the CM‐chitin matrix and 30 wt% in the CM‐chitosan matrix. Agglomeration of chlorophyllin particles in the chlorophyllin/CM‐chitosan blend was observed, when chlorophyllin content reached 50 wt%. The electrical conductivity of CM‐chitosan was higher than that of CM‐chitin by approximately 2 orders of magnitude due to the higher content of amino polar groups. The electrical conductivity increased with increasing chlorophyllin content. The addition of metal ion salts improved the electrical conductivity of the blend films.

Synthesis and Physicochemical Characterization of Chitin Derivatives

“…ese conductivity values are in the conductivity range ( = 10 −7 -10 −1 S cm −1 ) of semiconductors [37] and show that CTA is more conductive than CPA. In addition, the electrical conductivity of especially CTA is also higher than the electrical conductivities of previous synthesized chitin derivatives [26][27][28][29], and it can be said that chitin modi�ed with trimellitic anhydride is a good semiconductor.…”

“…It is the second most abundant organic compound, with 10 11 tons produced annually, aer cellulose on earth [25]. In recent years important studies with respect to the electrical conductivity of some chitin derivatives are done [26][27][28][29].…”

Preparation and analysis of photochromic behavior of carboxymethyl chitin derivatives containing spiropyran moieties

“…The IR spectra of CMCH and CMCH-g-SPA are shown in Figure 1. For CMCH, the band at 1656 cm −1 is assigned to the C = O stretching vibrations of the amide I [50][51][52][53][54][55][56][57]. This band overlaps with that arising from the asymmetric stretching of the carboxylate anion [58,59].…”

“…The initial, mild weight loss is due to evaporation of the remaining and bound water [53]. The second major weight loss occurred in the 240-350 ° C temperature range with a mass loss of 30.28 wt%, which was due to the degradation of the CMCH structure [53]. The rate of weight loss is increased with increase of temperature.…”

Morphological, Thermal and Electrical Studies on Chitosan Heavy Metal Complexes

“…Determination of activation energy of decomposition of chitosan and chitosanmetal complexes [16] The activation energy was determined by the Arrhenius relationship according to Broido method in Eq.1. (1) where Ea is the activation energy (J mol Electrical conductivity measurements of chitosan and chitosan-metals ions complexes [19,20] The electrical conductivity (σ) was calculated from Eq.3…”