Journal ArticleDOI
Crystallization behavior and mechanical properties of polypropylene copolymer by in situ copolymerization with a nucleating agent and/or nano-calcium carbonate
Reads0
Chats0
TLDR
In this paper, the Avrami model is successfully used to describe the crystallization kinetics of polypropylene (PP) copolymer obtained by in situ reactor copolymers.Abstract:
The crystallization behavior of polypropylene (PP) copolymer obtained by in situ reactor copolymerization with or without a nucleating agent and/or nano-CaCO3 particles was investigated both by thermal analysis and by polarized light microscopy. The Avrami model is successfully used to describe the crystallization kinetics of the studied copolymer. The results of the investigation show that a dramatic decrease of the half-time of crystallization t1/2, as well as a significant increase of the overall crystallization rate, are observed in the presence of the nucleating agent. These effects are further promoted in the presence of the nano-CaCO3 particles. The incorporation of the nucleating agent and nano-CaCO3 particles into PP copolymer remarkably improved the mechanical properties and heat distortion temperature. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 431–438, 2004read more
Citations
More filters
Journal ArticleDOI
Crystallization kinetics and nucleation activity of filler in polypropylene/surface-treated SiO2 nanocomposites
TL;DR: In this article, isothermal and non-isothermal crystallization kinetics of polypropylene (PP)/surface-treated SiO 2 nanocomposites were extensively studied, and the effective energy barrier was estimated as a function of the relative degree of crystallinity using the isoconversional analysis of calorimetric data.
Journal ArticleDOI
Influence of annealing on microstructure and physical properties of isotactic polypropylene/calcium carbonate composites with β-phase nucleating agent
TL;DR: In this article, a β-phase NA aryl amides compound (TMB-5) had been introduced into isotactic polypropylene/calcium carbonate (iPP/CaCO 3 ) composites.
Journal ArticleDOI
Carbon nanoparticles as effective nucleating agents for polypropylene
Abstract: The effect of four nucleating agents on the crystallization of isotactic polypropylene (iPP) was studied by differential scanning calorimetry (DSC) under isothermal and non-isothermal conditions. The nucleating agents are: carbon nanofibers (CNF), carbon nanotubes (CNT), lithium benzoate and dimethyl-benzylidene sorbitol.
Journal ArticleDOI
Morphology, Thermal Stability, and Mechanical Behavior of [Poly(propylene)-grafted Maleic Anhydride]-Layered Expanded Graphite Oxide Composites
TL;DR: In this article, the effects of the mixing method of EGO on the crystalline structure and thermo-mechanical properties of PP-g-MA/EGO composites are reported.
References
More filters
Journal ArticleDOI
Kinetics of Phase Change. I General Theory
TL;DR: In this paper, the theory of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered by previous treatment.
Journal ArticleDOI
Kinetics of Phase Change. II Transformation‐Time Relations for Random Distribution of Nuclei
TL;DR: In this article, a relation between the actual transformed volume V and a related extended volume V1 ex is derived upon statistical considerations, and a rough approximation to this relation is shown to lead, under the proper conditions, to the empirical formula of Austin and Rickett.
Journal ArticleDOI
Variation of Peak Temperature With Heating Rate in Differential Thermal Analysis
TL;DR: In this article, the temperature at which the maximum deflection is observed varies with heating rate for certain types of reactions, and an expression can be derived relating this variation with the kinetics of the reaction.
Journal ArticleDOI
Polypropylene/Montmorillonite Nanocomposites. Review of the Synthetic Routes and Materials Properties
TL;DR: The synthetic routes and materials properties of polypropylene/montmorillonite nanocomposites are reviewed in this article, where the resulting polymer/inorganic structures are characterized by a coexistence of intercalated and exfoliated montmorillonites layers.
PatentDOI
Polypropylene/calcium carbonate nanocomposites
TL;DR: In this article, a composite material comprising calcium carbonate particles dispersed within a polypropylene matrix was proposed, where the particles have a size within the range of 1 to 100 nm and a filling ratio of less than about 30% by volume.