Study on Crystallization and Rheological Properties of P(3HB-co-4HB)/α-CSH Composites
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/α-calcium sulphate hemihydrate whiskers (P(3HB-co-4HB)/α-CSH) composites were prepared by blending method,and the effects of α-CSH content on crystallization and rheological properties of the P(3HB-co-4HB)/α-CSH composites were studied.The results indicate that:α-CSH can cause the heterogeneous nucleation,and improve the melting temperature and crystallinity of P(3HB-co-4HB);the melt apparent viscosity of the P(3HB-co-4HB)/α-CSH composites decreases with the increase of shear rate and temperature;the melt apparent viscosity of the P(3HB-co-4HB)/α-CSH composites decreases first and then increases with the increase of α-CSH content;the non-Newtonian index (n) of the P(3HB-co-4HB)/α-CSH composites goes up with the increase of temperature,and increases first and then decreases with the increase of CSH content;the viscous flow activation energy decreases with the increase of shear rate,and shows a downward as a whole with the increase of α-CSH content.
P(3HB-co-4HB)α-CSHRheological propertiesNon-Newtonian indexViscous flow activation energy
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