Produção Nacional
Revisado por pares
Use of DMA-material pocket to determine the glass transition temperature of nitrocellulose blends in film form
2019; Elsevier BV; Volume: 226; Linguagem: Inglês
10.1016/j.carbpol.2019.115288
ISSN1879-1344
AutoresAislana Cole de Paula, Fabrício Uliana, Eloi Alves da Silva Filho, Kinglston Soares, Priscilla Paiva Luz,
Tópico(s)Epoxy Resin Curing Processes
ResumoThis work describes an unexploited use of DMA-material pocket to determine the glass transition temperature of blends composed by nitrocellulose and poly(Ɛ-caprolactone) in film form. A total of eight blends were prepared increasing the poly(Ɛ-caprolactone) content and changes in the mechanical properties of the blends were determined by DMA-material pocket. Storage modulus, loss modulus, and tan δ were analyzed as a function of temperature. The blends and each former polymer were also analyzed by FTIR-ATR. By the spectroscopy measurements, the intermolecular interactions between poly(Ɛ-caprolactone) and nitrocellulose in the blend is observed, been an evidence of miscibility. Tg of nitrocellulose and poly(Ɛ-caprolactone), 68 and -52 °C respectively, agree with reported values. Tg of the blends shows a single peak of tan δ between the Tg values of isolated former polymers, reinforcing the good miscibility between them. Finally, Tg of the blends exhibits a logarithmic dependence of PCL content, decreasing as poly(Ɛ-caprolactone) content increases.
Referência(s)