Mechanical properties of cassava starch films as affected by different plasticizers and different relative humidity conditions

Abstract

The influence of plasticizer type (glycerol and sorbitol), its content (starch:plasticizer ratio of 1:0.15; 1:0.20; 1:0.25 and 1:0.30) and the relative humidity conditions (43, 58, 75 and 85%) on the mechanical properties of cassava starch films was studied. Both plasticizers seemed to integrate homogeneously in the film matrix. The incorporation of different concentrations of plasticizers affected the mechanical properties of the cassava starch films. Plasticizer ratio directly influenced the force values of the films, they showed significant flexibility when the plasticizer proportion was increased in the formulation. Under conditions of low relative humidity, sorbitol produced films more resistant to puncture than glycerol. Qualitatively, all the films were less brittle when the plasticizers were incorporated.

Physical, mechanical, optical, barrier, and antioxidant properties of sodium alginate–aloe vera biocomposite film

“…The solubility of edible film is a function of the hydrophilic and hygroscopic properties of film-forming compounds. Moreover, plasticizer increases the space between the chain and facilitate the migration of water molecules from aloe vera gel into the film matrix and consequently increases the solubility of the film (Lagos et al, 2015). It should be noted that addition of aloe vera gel to the basic film forming material, i.e, sodium alginate results in a composite film structure having more hydrophilic moieties and a higher number of hydroxyl groups which leads to higher moisture content, swelling capacity and solubility of the film.…”

Sustainable food packaging films based on alginate and aloe vera

“…The role of plasticizer is to increase the space between the chain and facilitate the water migration into the film matrix and consequently increases the solubility of the film. [ 45 ]…”

Sifat Mekanis Dan Fisis Bioplastik Dari Limbah Kulit Pisang: Pengaruh Jenis Dan Konsentrasi Pemlastis

“…Gliserol dengan bobot molekul yang lebih kecil dibandingkan sorbitol (bobot molekul gliserol 92,09 g/mol dan bobot molekul sorbitol 182,17 g/mol) dapat lebih mudah berinteraksi dengan molekul polimer. Interaksi gliserol ke dalam matriks polimer tersebut dapat mengurangi ikatan intermolekuler pada polimer dengan terbentuknya ikatan hidrogen antara gliserol dan molekul polimer yang lebih lanjut dapat mengakibatkan kekuatan antarmolekul polimer menjadi berkurang dan fleksibilitas polimer menjadi bertambah (Lagos et al 2015;Sanyang et al 2015).…”

“…Gliserol dan sorbitol mempunyai gugus hidroksil yang dapat mengikat air. Gliserol dengan 3 gugus hidroksil mempunyai afinitas dengan air yang lebih baik dibandingkan sorbitol yang mempunyai 6 gugus hidroksil (Lagos et al 2015). Hal ini menyebabkan bioplastik dengan pemlastis gliserol akan lebih mudah menyerap air dan selanjutnya akan lebih mudah terdegradasi (Wahyuningtiyas and Suryanto 2017).…”