The viscoelastic properties of microbial biodegradable copolymers containing 3-hydroxybutylate (3HB) and 3-hydroxyvalerate (3HV) were investigated as well as the reference homopolymer, poly(3-hydroxybutylate) (PHB), by plotting the first normal stress difference (N1) versus shear stress (t s) and the storage modulus (G 0 ) versus the loss modulus (G 00 ). At low shear rates, the N1s of the copolymers were higher than that of PHB, and at high frequencies, the G 0 s of the copolymers were lower than that of PHB. To examine the rheological properties of biodegradable copolymers, we used a modified Cole–Cole plot (N1 versus t s and G 0 versus G 00 ). From these plots, we found that the elastic behavior from steady shear experiment is closely related to that of the dynamic oscillatory experiments for the biodegradable copolymer.
Посилання на статтю:
Polymer Communication Viscoelastic characterization of biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) 1 / Hyoung J. Choi, Jinho Kim, Myung S. Jhon // Polymer. – 1999. – N 40. – P. 4135–4138.