Hydrolysis of part of cassava starch into nanocrystals leads to increased reinforcement of nanocomposite films

作者：de Carvalho Costa Elia Karina; de Souza Carolina Oliveira; Alves da Silva Jania Betania; Druzian Janice Izabel^*

来源：Journal of Applied Polymer Science, 2017, 134(41): 45311.

DOI：10.1002/app.45311

• biodegradable
• mechanical properties
• packaging
• starch nanocrystals

This article reports on using cassava starch nanocrystals (CSN) to strengthen nanocomposite films from the same matrix. CSN were obtained by acid hydrolysis. Nanocomposite (starch: glycerol: CSN/4.0:2.1:1-10 wt %) were processed by casting and the films were characterized. The CSN (30% yield) presented minimally clustered globular forms, 45 to 178 nm in diameter, with a crystalline index of 46%. Water-vapor transmission rate, tensile strength, and elastic modulus of the films were influenced by the linear effect of CSN concentration (R-2 = -0.92, 0.91, 0.99, respectively), while the other parameters resulted in quadratic relations 10.69-0.961. The film with 10% CSN presented a 43% reduction in water vapor permeability, associated with increases of 200% in traction resistance, and 616% in elasticity modulus, compared with the control. The hydrolysis of part of the cassava starch into nanocrystals resulted in a reduction in permeability and nano reinforcement of the films due to good compatibility and interaction between both, without influencing biodegradability.

• 出版日期2017-11-5