期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 47, 期 16, 页码 1616-1624出版社
WILEY
DOI: 10.1002/polb.21752
关键词
compatibilization; dispersion; morphology; nanocomposites
Polyethylene terephthalate (PET)/Polypropylene (PP)/TiO2 nanocomposites were prepared by compounding a PP/TiO2 nanocomposite premix with PET in absence and presence (up to 6 vol %) of maleic anhydride grafted polypropylene (PP-g-MA). In absence of PP-g-MA, the TiO2 nanoparticles were mainly located at the PET/PP interface and to a lesser extent in the dispersed PET droplets. As the TiO2 nanoparticles were coated by polyalcohol their surface could react with PP-g-MA and thus improving the compatibilization with PP. Therefore in presence of PP-g-MA the TiO2 nanoparticles were preferentially located in the PP. The incorporated TiO2 nanoparticles exerted a compatibilization effect on the PET/PP blend. Depending on the location of TiO2 three different compatibilization mechanisms were proposed to be at work: (1) Locating at the interface, the TiO2 nanoparticles decrease the free energy of mixing, and thus increase the thermodynamic stability of the nanocomposites; (2) The TiO2 nanoparticles at the interface also prevent the coalescence of PET droplets; (3) Preferentially located in the PP matrix, the TiO2 nanoparticles decreased the viscosity ratio which facilitated the droplet breakup of PET. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1616-1624, 2009
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