期刊
POLYMER COMPOSITES
卷 42, 期 2, 页码 955-972出版社
WILEY
DOI: 10.1002/pc.25878
关键词
aliphatic polyesters; grafting from; grafting to; melt blending; nanocomposites; poly-D,L-lactide
资金
- Fund for Research Training in Industry and Agriculture (FRIA)
- Fund for Scientific Research
This study focused on preparing polymer chain grafted silica using two grafting methods to improve the mechanical properties of poly-d,l-lactide. Grafting from silica successfully led to nanoscale dispersion into the polyester matrix, significantly enhancing the Young modulus and ultimate tensile stress of the polymer.
Polylactide was first designed for the pharmaceutical and medical fields. Unfortunately, polylactide, especially poly-d,l-lactide (PDLLA), presents too low mechanical properties for a wide range of applications. The addition of silica nanoparticles should reinforce the mechanical strength of PDLLA. In order to improve silica/polymer interactions, this study focused on the preparation of polymer chain grafted silica using two grafting methods. The first strategy relied upon the ring opening polymerization of d,l-lactide on initiating silica surface (ie, grafting from). The second approach considered a sol-gel synthesis process in presence of Si-OR terminated polylactide chains to promote grafting of these chains on new silica particles (ie, grafting to method). Only grafting from silica successfully led to a nanoscale dispersion into the polyester matrix for silica content up to 5 wt%. A 3 wt% content of this silica allowed improving Young modulus of 106.0% and ultimate tensile stress of 63.7% compared to the PDLLA control.
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