Dispersion Mechanism of Nanoparticles in the Nanocomposites

• Main Authors: Yu-Hsiang Lin, 林裕祥
• Other Authors: Heng-kwong Tsao
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/42319594684813381059

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 99 === Dispersing nanoparticles in polymer matrix allows for the formulation of novel polymer nanocomposite materials that combine the properties and functionality of the nanoparticle and the polymer. It’s important to understand dispersion of nanoparticles in polymer matrix. In experiment, dispersion of nanoparticles into a polymer matrix is enhanced for systems where the radius of gyration of the linear polymer is greater than the radius of the nanoparticle. We perform the Dissipative Particle Dynamics (DPD) simulation to study the dispersion mechanism of nanoparticles in the polymer matrix. For solvophobic nanoparticles, nanoparticles inevitably aggregate in polymer matrix, and aggregation is driven by the reduction of enthalpy. Experimental results show that nanoparticles tend to disperse in polymer matrix with large radius of gyration, this phenomenon is attributed to the high viscosity of system, reducing the diffusion coefficient cause nanoparticles slowly aggregate. For solvophilic nanoparticles, nanoparticles similarly aggregate in polymer matrix, and aggregation is driven by the increase of entropy. The effective interparticle force is similar to depletion attraction. The whole system tends to minimum depletion zone and maximum entropy. The effective intperparticle force depends on contact area of nanoparticles and repulsive parameter.