Crystallization of Polypropylene: Application of Differential Scanning Calorimetry Part I. Isothermal and Non-Isothermal Crystallization

Raka, Luljeta; Bogoeva‐Gaceva, Gordana

doi:10.20903/csnmbs.masa.2008.29.1-2.13

Cited by 5 publications

(6 citation statements)

References 60 publications

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“…In general, PP nanocomposite results from DSC and NMR demonstrated the addition of a nucleating agent to an unfilled semicrystalline polymer brings about the change of polymer crystallization rate and crystalline structure [ 26 ]. However, for the melting point of the nanocomposite, it remained almost the same for all different nanofiller concentrations and MAH contents ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

The Influence of Nano CaCO3 on Nucleation and Interface of PP Nano Composite: Matrix Processability and Impact Resistance

et al. 2021

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Polypropylene (PP) is a commodity material that has been increasingly used in different industries in the past two decades due to its versatile properties when enhanced with additives. Homo polypropylene, in general, has weak mechanical properties and limited chemical resistance; thus, using a different type of fillers to adjust such properties to fit the required applications opened a large market for this commodity. Understanding the interface constituent between the polymer matrix and the added filler and the nucleation behavior is a key to fine control of the enhancement of PP properties. In this study, PP was incorporated with nano calcium carbonate (CaCO3) at 2 and 5 wt% in the presence of maleic anhydride (MAH) to overcome the weak interface due to low polymer polarity. The mix was compounded in a twin screws extruder at a temperature range of 180–200 °C ; then, the prepared samples were left to dry for 24 h at 25 °C. Nuclear Magnetic Resonance (NMR) was used to study the interface adhesion of the nanofiller and the curved revealed that at 2% of nano CaCO3 PP structure remained the same and the nano experienced good adhesion to the polymer matrix. The mechanical impact resistance results showed a real enhancement to the polymer matrix of the nanocomposite by 37%. Moreover, DSC results showed a faster crystallinity rate due to the nanofiller acting as a nucleating agent and rheology tests indicated that low content of nano additive (2%) has better processability behavior, with suitable viscosity complex values at high frequencies.

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Section: Resultsmentioning

confidence: 99%

The Influence of Nano CaCO3 on Nucleation and Interface of PP Nano Composite: Matrix Processability and Impact Resistance

et al. 2021

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“…It is well-noted that the influence of pristine TiO 2 and TiO 2 -NH 2 (Figure 4b and 4c) on the polymer crystallization is low in comparison with the other two fillers; all curves and Tc for all for cooling rates are similar to pure iPP. Nevertheless, it was possible to see that during the non-isothermal crystallization, the temperature for these composite shifted towards higher temperature; with this behaviour, it is possible to state that this filler is acting as heterogeneous nuclei, which could which could reduce the crystallization time of the iPP (Raka & Bogoeva-Gaceva, 2017;J. Wang & Dou, 2007).…”

Section: Analysis: Non-isothermal Crystallization Of Ippmentioning

confidence: 97%

The role of alkoxysilanes functional groups for surface modification of TiO2 nanoparticles on non-isothermal crystallization of isotactic polypropylene composites

et al. 2020

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“…As is known, the formation of transcrystalline structures is associated with the occurrence of interactions between the filler and the polymer matrix. Scientists note that because of the chemical modifications carried out, very often the filler is characterized by a reduced ability to nucleate in the polymer matrix [73][74][75], which they justify by removing, for example, impurities during filler processing. An interesting conclusion was reached by Borysiak et al [4], who treated wood chemically with ammonium ionic liquids and obtained a plastic filler characterized by a significantly lower density of the transcrystalline layer in the tested composite systems than polymers with unmodified wood.…”

Section: Analysis Of Crystallization Processmentioning

confidence: 99%

Nanocellulose-Based Polymer Composites Functionalized with New Gemini Ionic Liquids

Zielińska

Skrzypczak

Peplińska

et al. 2022

IJMS

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The manuscript discusses the application of dimeric imidazolium ionic liquids with an aliphatic linker of different lengths, constituting a new class of compounds called gemini, for the modification of renewable materials. This innovative functionalization with the use of ionic liquids made it possible to obtain polymer composite nanomaterials with renewable fillers, which will reduce the consumption of petroleum-based raw materials and also be directly related to the reduction of energy intensity. Renewable filler in the form of nanocellulose modified with ionic liquids, as well as polymer composites with such filler obtained by extrusion and injection molding techniques, were subjected to detailed characterization using techniques like: X-ray diffraction (XRD), Fourier transform spectroscopy (FTIR), dispersion studies (DLS), morphological analysis (SEM), differential scanning calorimetry (DSC), hot-stage polarized light microscopy and characterization of mechanical properties. The use of innovative dimeric ionic liquids proved to be an effective method to carry out efficient functionalization of cellulose. This provided a stable space structure between polysaccharide particles, limiting aggregate formation. It was shown that chemical modification with ionic liquids has a significant effect on the nucleation activity of cellulose fillers and the formation of the supermolecular structure of the polymer matrix, which consequently allowed to obtain polymer composites with excellent strength characteristics and increased flexibility, which will allow to increase their application potential. Innovative ionic liquids have contributed to obtaining green nanomaterials with excellent functional properties, which have not been described in the literature so far.

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Crystallization of Polypropylene: Application of Differential Scanning Calorimetry Part I. Isothermal and Non-Isothermal Crystallization

Abstract: A b s t r a c t: Theoretical background of the crystallization of isotactic polypropylene is summarized with respect to the potential of DSC method applied for the analysis of isothermal and non-isothermal processes.

Cited by 5 publications

References 60 publications

The Influence of Nano CaCO3 on Nucleation and Interface of PP Nano Composite: Matrix Processability and Impact Resistance

The Influence of Nano CaCO3 on Nucleation and Interface of PP Nano Composite: Matrix Processability and Impact Resistance

The role of alkoxysilanes functional groups for surface modification of TiO2 nanoparticles on non-isothermal crystallization of isotactic polypropylene composites

Nanocellulose-Based Polymer Composites Functionalized with New Gemini Ionic Liquids

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