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Isothermal crystallization and melting behaviors of nano TiO 2 ‐modified polypropylene/polyamide 6 blends
Author(s) -
Ou Baoli,
Ou Yangjian,
Li Duxin,
Jing Bo,
Gao Yong,
Zhou Zhihua,
Liu Qingquan
Publication year - 2012
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.22205
Subject(s) - crystallization , materials science , polyamide , differential scanning calorimetry , polypropylene , nanocomposite , chemical engineering , nanoparticle , phase (matter) , isothermal process , composite material , polymer chemistry , organic chemistry , chemistry , nanotechnology , thermodynamics , physics , engineering
Titanium dioxide (TiO 2 ) nanoparticles were functionalized with toluene‐2,4‐diisocyanate and then polypropylene/polyamide 6/(PP/PA6) blends containing functionalized‐TiO 2 were prepared using a twin screw extruder. Isothermal crystallization and melting behavior of the as‐prepared composites were investigated using differential scanning calorimetry and wide‐angle X‐ray diffraction. Isothermal crystallization analysis shows that the TiO 2 nanoparticles have two effects on PP/PA6 blends, i.e., it can favor the improvement of crystallization ability and decrease the crystallization rate of PP/PA6 blends. The improvement of crystallization ability is superior over decreasement of crystallization rate of PA6 chains caused by TiO 2 , therefore PA6 in PP/PA6/TiO 2 nanocomposites have higher crystallization rate than that of PA6 in pure PP/PA6 blends, which indicated TiO 2 nanoparticles favored the crystallization of PA6. The TiO 2 nanoparticles show no effects on the equilibrium melting temperature ( T m 0 ) values of PP phase but decreases the T m 0values of PA6 phase. In addition, the TiO 2 nanoparticles did not change the crystalline polymorph of PP/PA6 blends basically; however, favored the formation of β‐PP. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers