Morphological and thermomechanical characterization of thermoplastic starch/montmorillonite nanocomposites

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

“…Dos vários materiais inorgânicos, a MMT é o que mais tem atraído atenção; por apresentar elevada resistência química e térmica, agregando o fato de ser um material abundante, barato e de origem natural [20,21] . Além disso, na literatura existem vários estudos comprovando que a incorporação de MMT melhora as propriedades mecânicas e térmicas de vários polímeros, através da obtenção de nanocompósitos com MMT, quando comparados com o polímero puro [22][23][24] . O interesse na obtenção de nanocompósitos de polímero condutor com MMT resulta do efeito sinérgico entre os componentes inorgânicos e orgânicos em nível molecular, permitindo alcançar propriedades que não poderiam ser atingidas a partir dos componentes individuais, tal como: o controle da condutividade elétrica e estabilidade térmica [14,[25][26][27] .…”

Molecular dynamics studies of amylose plasticized with Brazilian Cerrado oils: part I

“…The fundamental importance in its composition is the abundance in unsaturated fatty acids, with the predominance of oleic acid, between 50-80% in mass, and also, the presence of tocopherols and carothenoids [11,14,15] . They have proved to efficiently plasticize starch and enable fabrication of films by casting [2,3,7,11] . A step further consisted on the preparation of bionanocomposites of plasticized starch and lamellar oxides, such as montimorillonite clay, for improved thermal and barrier properties [1,2,7,8,10,12] .…”

“…However, all these products demand for starch with some level of chemical manipulation, because in its natural form starch presents low film processability and poor mechanical properties [2][3][4][5] . Starch is a semi-crystalline biopolymer [5] mainly formed by two components with repeating α-D-glucopyranosyl units, although other components such as proteins and lipids are present in small ammouts.…”

“…A common approach for improving starch film ability is plasticization, which can be efficiently and environmentally friendly achieved with small amounts of vegetable oils [9] and its fatty acids [2,7,[10][11][12] .…”

“…A step further consisted on the preparation of bionanocomposites of plasticized starch and lamellar oxides, such as montimorillonite clay, for improved thermal and barrier properties [1,2,7,8,10,12] . Therefore, plasticization is an essential step to allow the use of starch in advanced biodegradable materials [2,3,7,12] .…”