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Effect of silica nanofillers on isothermal crystallization of poly(vinyl alcohol): In-situ ATR-FTIR study

Cited 57 time in Web of Science Cited 63 time in Scopus
Authors
Lee, Jihye; Lee, Kyung Jin; Jang, Jyongsik
Issue Date
2008
Publisher
Elsevier
Citation
Polymer Testing 27 (2008) 360-367
Keywords
ATR-FTIR spectroscopyCrystallizationNanocompositesSilicaPoly(vinyl alcohol)
Abstract
Isothermal crystallization behavior of poly(vinyl alcohol) (PVA) in the presence and absence of silica nanoparticles was systematically investigated using in-situ attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy.
The content, size, and surface characteristics of silica nanoparticles were considered as main factors affecting the
crystallization behavior, and the effect of annealing time and temperature was also examined. First, very low concentrations of silica nanoparticles (less than 0.5 wt%) could accelerate the crystallization process, whereas higher silica loadings reduced the degree of crystallization. In the PVA/silica (0.5 wt%) nanocomposites, 22-nm silica nanoparticles provided the most suitable interparticle space for nucleation and crystal growth. Compared with hydrophobic silica nanoparticles, hydrophilic silica nanoparticles are favorable to achieve higher crystallinity due to the increased chemical affinity in the nanocomposites. The degree of crystallization became higher with increasing annealing time and it was also
enhanced in a high-temperature region. When 0.5 wt% of 22-nm silica nanoparticles was used as a nucleating agent for the crystallization of PVA, the crystallinity of nanocomposites was ca. 20% higher than that of pristine PVA.
ISSN
0142-9418
Language
English
URI
http://hdl.handle.net/10371/61333
DOI
https://doi.org/10.1016/j.polymertesting.2007.12.005
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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