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Kinetic Analysis of Nanocomposites Prepared in situ Consisting of an Aliphatic Biodegradable Polyester and Fumed Silica Nanoparticles

机译:原位制备脂肪族可生物降解聚酯和气相二氧化硅纳米粒子的纳米复合材料的动力学分析

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摘要

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/deso-rption processes is assumed to be comparable to the water evaporation rate in order to reproduce the experimental water production curves.
机译:PPSu /气相二氧化硅纳米复合材料是使用0.25、0.5、1和2.5 wt%SiO_2通过原位聚合制备的。 SiO_2的含量直接影响酯化反应和缩聚反应。通过增加酯化反应中的SiO_2含量,产水率降低。 XPS分析证实了PPSu与SiO_2的硅烷醇基之间的反应。建立了定量模型来描述SiO_2颗粒对酯化过程中产水率的影响。其主要原因是产出水在颗粒上的吸附。假定吸附/脱附过程的速率与水的蒸发速率相当,以便再现实验水的生产曲线。

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  • 来源
    《Macromolecular reaction engineering》 |2011年第4期|p.178-189|共12页
  • 作者单位

    Laboratory of Chemical Technology, Department of Chemistry,Aristotle University of Thessaloniki, University Box 166, GR-541 24 Thessaloniki, Greece;

    Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece;

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