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Mechanical properties and nonisothermal crystallization kinetics of polyamide 6/functionalized TiO 2 nanocomposites
Author(s) -
Ou Baoli,
Zhou Zhihua,
Liu Qingquan,
Liao Bo,
Xiao Yan,
Liu Juncheng,
Zhang Xin,
Li Duxin,
Xiao Qiuguo,
Shen Shaohua
Publication year - 2014
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22661
Subject(s) - materials science , nanocomposite , crystallization , nucleation , differential scanning calorimetry , polyamide , isocyanate , chemical engineering , nanoparticle , composite material , compounding , kinetics , polymer , polymer chemistry , polyurethane , organic chemistry , chemistry , nanotechnology , physics , quantum mechanics , engineering , thermodynamics
Titanium dioxide (TiO 2 ) nanoparticles were pretreated with excessive toluene‐2,4‐diisocyanate (TDI) to synthesize TDI‐functionalized TiO 2 (TiO 2 ‐NCO), and then polymeric nanocomposites consisting of polyamide 6 (PA6) and functionalized‐TiO 2 nanoparticles were prepared via a melt compounding method. The interfacial interaction between TiO 2 nanoparticles and polymeric matrix has been greatly improved due to the isocyanate (NCO) groups at the surface of the functionalized‐TiO 2 nanoparticles reacted with amino groups (NH 2 ) or carboxyl (COOH) groups of PA6 during the melt compounding and resulted in higher tensile and impact strength than that of pure PA6. The nonisothermal crystallization kinetics of PA6/functionalized TiO 2 nanocomposites was investigated by differential scanning calorimetry (DSC). The nonisothermal crystallization DSC data were analyzed by the modified‐Avrami (Jeziorny) methods. The results showed that the functionalized‐TiO 2 nanoparticles in the PA6 matrix acted as effective nucleation agents. The crystallization rate of the nanocomposites obtained was faster than that of the pure PA6. Thus, the presence of functionalized‐TiO 2 nanoparticles influenced the mechanism of nucleation and accelerated the growth of PA6 crystallites. POLYM. COMPOS., 35:294–300, 2014. © 2013 Society of Plastics Engineers