Dynamical mechanical properties of polyvinylbutyral nanocomposites - A comparison between different nano-carbon reinforcements

Materia

article

Jean Carlos Hoepfner¹  Renato César Tobias Porto¹  Patrícia Zigoski Uchôa¹  André Lourenço Nogueira²  Sérgio Henrique Pezzin¹ 

[1] Santa Catarina State University;University of the Region of Joinville

关键词: polyvinylbutyral;    nanocomposites;    carbon nanotubes;    graphene nanoplatelets;    dynamic mechanical analysis;    acetalization degree;   

DOI  :  10.1590/S1517-707620220002.1323

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

In this work, the role of the degree of acetalization of polyvinylbutyral (PVB) on the dynamic mechanical properties of PVB nanocomposites was evaluated. Nanocomposites reinforced with carbon nanoparticles (pristine or oxidized multiwalled carbon nanotubes, graphene oxide and graphene nanoplatelets) were prepared by in situ addition during the synthesis of PVB from polyvinyl alcohol. It was found that the presence of nanoreinforcements during the synthesis considerably alters the degree of acetalization (AD) of PVB (ca. 65 mol% for the neat polymer), which values ranged from 50 to 77 mol%. Dynamic mechanical analyses were used to calculate the storage modulus and other parameters such as: factor C, degree of entanglement and adhesion factor, which were correlated with scanning electron microscopy images. There was a tendency to decrease AD with the increase in the degree of oxidation of the nanoreinforcements, however this contributed to a better dispersion and adhesion of these to the polymer matrix and, consequently, altered positively the nanocomposite properties.

【 授权许可】

CC BY