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Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites
Author(s) -
Myoung Seok Han,
Im Seung Soon,
Kim Seong Hun
Publication year - 2016
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5038
Subject(s) - spherulite (polymer physics) , crystallization , materials science , nucleation , nanocomposite , thermal stability , nanocrystal , chemical engineering , fourier transform infrared spectroscopy , cellulose , ultimate tensile strength , polymer chemistry , composite material , organic chemistry , nanotechnology , chemistry , engineering
Abstract Poly(lactide) ( PLA )/acetylated cellulose nanocrystals ( ACN )/silica nanocomposites were prepared by solution casting. Surface modification of cellulose nanocrystal (CNC) was performed to prepare the ACN . The ACN and silica were expected to act as a mechanical reinforcement of PLA and a nucleation agent, respectively, to increase the crystallization rate. Introduction of acetyl groups on the surface of the cellulose nanocrystals was confirmed by Fourier transform infrared spectroscopy. A combined Avrami − Ozawa analysis described the non‐isothermal crystallization effectively. The activation energy for the crystallization was calculated from the Kissinger and the Takhor equations. Spherulite growth behavior was observed by polarizing optical microscope and spherulite growth rate, the number of spherulite versus crystallization time have investigated. The development of PLA crystals and the thermal stability had a tendency to improve with increasing silica content. Increased tensile strength was observed due to the reinforcement effect of ACN and the morphology of the nanocomposites was investigated. © 2015 Society of Chemical Industry