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

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Jeannine Bonilla Lagos ◽  
Nívea M. Vicentini ◽  
Rodolfo M.C. Dos Santos ◽  
Ana Mônica Q.B. Bittante ◽  
Paulo J. A. Sobral
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Cassava Starch ◽  
Starch Films

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.

Water sorption and mechanical properties of cassava starch films and their relation to plasticizing effect

2005 ◽  
Vol 60 (3) ◽  
pp. 283-289 ◽  
Author(s):  
S. Mali ◽  
L.S. Sakanaka ◽  
F. Yamashita ◽  
M.V.E. Grossmann
Keyword(s):  
Mechanical Properties ◽  
Water Sorption ◽  
Cassava Starch ◽  
Starch Films

scholarly journals Effect of the degree of acetylation, plasticizer concentration and relative humidity on cassava starch films properties

2019 ◽  
Vol 39 (2) ◽  
pp. 491-499 ◽  
Author(s):  
Vivian Consuelo Reolon SCHMIDT ◽  
Nuria BLANCO-PASCUAL ◽  
Giustino TRIBUZI ◽  
João Borges LAURINDO
Keyword(s):  
Relative Humidity ◽  
Cassava Starch ◽  
Degree Of Acetylation ◽  
Starch Films ◽  
Plasticizer Concentration

Influence of Glycerol Content on the Physic-Chemical and Mechanical Properties of Cassava Starch Films

2020 ◽  
Vol 1012 ◽  
pp. 57-61
Author(s):  
Hortência Nathânia Silva Câmara ◽  
Francisco Leonardo Gomes de Menezes ◽  
Ricardo Henrique de Lima Leite ◽  
Edna Maria Mendes Aroucha ◽  
Francisco Klebson Gomes dos Santos
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Low Cost ◽  
Water Vapor Permeability ◽  
Polymeric Materials ◽  
Cassava Starch ◽  
Vapor Permeability ◽  
Natural Polymer ◽  
Glycerol Content ◽  
Starch Films

The use of natural polymeric materials has been growing notably in order to replace packaging from non-renewable sources. In this sense, cassava starch is a very promising natural polymer for this purpose due to its ease of production, the low cost, besides being biodegradable. However, cassava starch biofilms when dried have a brittle character requiring the addition of a plasticizer. Thus, biofilms were synthesized based on cassava starch (3%) with different percentages of glycerol (5%, 10%, 20%, 40% and 50%) to evaluate changes in physic-chemical and mechanical properties. The results indicate that the increase in percentage of glycerol contributed directly to the increase of water vapor permeability while decreases the contact angle and modulus of elasticity of cassava starch films.

scholarly journals Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature

2012 ◽  
Vol 15 (3) ◽  
pp. 219-227 ◽  
Author(s):  
Maria Alejandra Bertuzzi ◽  
Juan Carlos Gottifredi ◽  
Margarita Armada
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Relative Humidity ◽  
Low Temperature ◽  
Film Thickness ◽  
Water Content ◽  
Polymer Chain ◽  
Corn Starch ◽  
Starch Films ◽  
High Amylose

In the present study, a better knowledge of the influence of plasticizer content, storage relative humidity and film thickness on the mechanical properties of high amylose corn starch based films gelatinized at low temperature, is presented. The mechanical properties, tensile strength and percentage of elongation at break of high amylose corn starch films plasticized with glycerol were evaluated using tension tests. The films exhibited an increase in elongation and a decrease in tensile strength with increasing plasticizer concentration. When the glycerol level was high, some fissures were detected in the dry films, possible due to phase separation (starch-glycerol) phenomena. Film crystallinity is related to the reorganization capacity of the polymer chain, and thus the relative film crystallinity should increase with plasticizer content (glycerol and water). The mechanical properties were found to be strongly dependent on the water content due to the hydrophilic nature of starch films. The influence of moisture sorption on tensile strength was similar to that of plasticization with glycerol. The relationship between polymer chain mobility and water content explained this behavior. Elongation suffered a different effect and maximum values were reached at 45% relative humidity. The final drop in elongation was due to a softening of the structure at high relative humidity. The thicker the film the longer the drying time required, leading to greater relative crystallinity due to the corresponding increase in the possibility for chain reorganization. As a consequence, linear increases in tensile strength and elongation were observed with film thickness over the whole range studied (30 to 100 µm).

scholarly journals Statistical analysis of the factors that influenced the mechanical properties improvement of cassava starch films

2017 ◽  
Vol 885 ◽  
pp. 012002
Author(s):  
Mayra Monteiro ◽  
Victor Oliveira ◽  
Francisco Santos ◽  
Eduardo Barros Neto ◽  
Karyn Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Statistical Analysis ◽  
Cassava Starch ◽  
Starch Films

Morphological, barrier, and mechanical properties of cassava starch films reinforced with cellulose and starch nanoparticles

2018 ◽  
Vol 136 (4) ◽  
pp. 47001 ◽  
Author(s):  
J. S. Santana ◽  
É. K. de Carvalho Costa ◽  
P. R. Rodrigues ◽  
P. R. C. Correia ◽  
R. S. Cruz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cassava Starch ◽  
Starch Nanoparticles ◽  
Starch Films

scholarly journals Optimization of factors to obtain cassava starch films with improved mechanical properties

2017 ◽  
Vol 885 ◽  
pp. 012001
Author(s):  
Mayra Monteiro ◽  
Victor Oliveira ◽  
Francisco Santos ◽  
Eduardo Barros Neto ◽  
Karyn Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cassava Starch ◽  
Starch Films
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