核壳型有机胶束对水泥基材料性能的影响

In this paper, two types of core-shell organic micelles were prepared based on poly(polylactide methacrylate-co-tert-butyl methacrylate)-b-poly(poly(ethylene glycol) methyl ether methacrylate) (P(PLAMA-co-tBMA)-b-PPEGMA, m1) and poly (ethylene glycol) methyl ether-b-(poly lactic acid-co-poly (bamino esters)) (MPEG-b-(PLA-co-PAE), m2) copolymers respectively. The radius of the micelles was 187nm (m1) and 403nm (m2) and the zeta potential was -53.8mV (m1) and -36.7mV (m2) respectively. In fresh cement paste, the incorporated micelles effectively absorbed on the surface of cement particles, and altered the zeta potential of partial cement particles, leading to a slightly increased fluidity. In hardened cement paste, the mixed micelles slightly accelerated the hydration rate at early hydration age, and reduced the porosity of the cement matrix. The influence of the admixed micelles on the material properties of cement paste may be related to the following effects: the admixed micelles absorbed on the surface of cement particles, and increased the electrostatic repulsive force and steric effect between cement particles, leading to a better dispersion properties of cement particles; the micelles can also act as the nucleation sites for the formation of hydration products, leading to an accelerated hydration rate and reduced total porosity.