Conclusions
In this paper cornstarch plasticized with glycerol (TPS) was incorporated in a polypropylene matrix.
TPS addition increased the density of the blends.
According to test void content, carboxylic acids or PPgMA insertion had the same behavior.
Blends without compatibilizer agent had a poor interfacial adhesion, thus resulting in reduced mechanical properties.
Blends made with C14,C16 and C18 carboxylic acids of myristic, palmitic and stearicacid proved to be equivalent or better compatibilizers when compared to maleic anhydride polypropylene and no compatibilizer.
The adhesion between both polymers phases was improved and the tensile strength, elongation and impact strength increased by the addition of carboxylic acids.
Among blends, PP/TPS/C14 blend presented the highest impact energy, showing a slightly better performance.
Results from DSC, SEM, impact and tensile strength analyses suggest the improved compatibility was attributed to achemical reaction between hydroxyl groups in starch and carboxyl groups in acids and the interaction between long hydrocarbonchain in acid and PP.
Further works will be carried out to confirm the increased biodegradability of these blends.
ConclusionsIn this paper cornstarch plasticized with glycerol (TPS) was incorporated in a polypropylene matrix. TPS addition increased the density of the blends.According to test void content, carboxylic acids or PPgMA insertion had the same behavior. Blends without compatibilizer agent had a poor interfacial adhesion, thus resulting in reduced mechanical properties. Blends made with C14,C16 and C18 carboxylic acids of myristic, palmitic and stearicacid proved to be equivalent or better compatibilizers when compared to maleic anhydride polypropylene and no compatibilizer.The adhesion between both polymers phases was improved and the tensile strength, elongation and impact strength increased by the addition of carboxylic acids. Among blends, PP/TPS/C14 blend presented the highest impact energy, showing a slightly better performance. Results from DSC, SEM, impact and tensile strength analyses suggest the improved compatibility was attributed to achemical reaction between hydroxyl groups in starch and carboxyl groups in acids and the interaction between long hydrocarbonchain in acid and PP. Further works will be carried out to confirm the increased biodegradability of these blends.
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