Effects of the addition of cotton fibers and cotton microfibers on the structure and mechanical properties of starch foams made from potato starch
Bruno Felipe Bergel, Ludmila Leite Araújo, Ruth Marlene Campomanes Santana
Abstract
Foams from thermoplastic starch (TPS) are interesting options to replace single-use packaging made with non-biodegradable polymers derived from fossil fuels. These foams are made with materials from renewable and biodegradable sources, which do not harm the environment. However, this material has poor mechanical properties and breaks easily when handled. Adding natural fibers, such as cotton, is an easy option that can generate foams that are more resistant to impact and handling. In this work, the incorporation of cotton fibers into starch foams was studied. Two types of fiber were used: cotton fiber and cotton microfiber. In addition, three fiber contents were evaluated: 0.67%, 2.00% and 3.33%. The results showed that both cotton types showed great compatibility and homogeneity with starch and both significantly improved the mechanical properties of the foams. Foams with a greater amount of cotton fibers (2.00% and 3.33%) showed the best results for impact and tensile tests.