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Kinetic Analysis of Nanocomposites Prepared in situ Consisting of an Aliphatic Biodegradable Polyester and Fumed Silica Nanoparticles
Author(s) -
Kostoglou Margaritis,
Bikiaris Dimitrios
Publication year - 2011
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201000051
Subject(s) - fumed silica , silanol , adsorption , nanocomposite , chemical engineering , desorption , polyester , in situ polymerization , materials science , polymer chemistry , evaporation , condensation polymer , polymerization , catalysis , chemistry , polymer , organic chemistry , composite material , physics , engineering , thermodynamics
PPSu/fumed silica nanocomposites are prepared by in situ polymerization using 0.25, 0.5, 1, and 2.5 wt.‐% SiO 2 . The SiO 2 content affects both esterification and polycondensation reactions directly. By increasing the SiO 2 content in esterification, the rate of water production decreases. The reaction between PPSu and silanol groups of SiO 2 is confirmed by XPS analysis. A quantitative model is developed to describe the influence of the SiO 2 particles on the water production rate during esterification. The main reason for this is the adsorption of the produced water on the particles. The rate of adsorption/desorption processes is assumed to be comparable to the water evaporation rate in order to reproduce the experimental water production curves.