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Influence of TiO 2 nanoparticles on nonisothermal crystallization of PP in a wide range of cooling rates analyzed by fast scanning DSC
Author(s) -
Suksut Buncha,
Schlarb Alois K.
Publication year - 2016
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.43944
Subject(s) - crystallization , materials science , range (aeronautics) , atmospheric temperature range , nanoparticle , chemical engineering , composite material , thermodynamics , nanotechnology , physics , engineering
The influence of titanium dioxide (TiO 2 ) nanoparticles on the crystallization behavior of polypropylene was investigated by conventional differential scanning calorimetry (DSC) and fast scanning DSC measurements. The data obtained from both methods were estimated for the first time using the Lauritzen‐Hoffmann equation to analyze the behavior over a wide cooling range under nonisothermal conditions. This provides more reliable values of nucleation parameters ( K g ) and surface free energy (σ e ). The variation of the effective energy (Δ E ) was determined with the Kissinger method. Regardless of the cooling rate, both K g and σ e indicate the role of titania as a nucleating agent enhances the crystallization rate. However, the Δ E denotes that TiO 2 acts as an obstacle to the mobility of chain segments at cooling rates below 150 °C/s, while, in contrast, the presence of titania enhances the chain mobility at cooling rates above 150 °C/s. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43944.