Non-isothermal crystallization kinetics and nucleation behavior of isotactic polypropylene composites with micro-talc

Layachi, Abdelheq; Makhlouf, Azzedine; Frihi, Djamel; Satha, Hamid; Belaadi, Ahmed; Séguéla, Roland

doi:10.1007/s10973-019-08262-0

Cited by 24 publications

(18 citation statements)

References 61 publications

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“…This leads to the conclusion that 30% of GF is the saturation rate of PA66; the same behavior was observed by Layachi et al. 44 in the case of iPP/μ-Talc.…”

Section: Resultssupporting

confidence: 82%

“…Indeed, the current observation of a nucleation optimum can be attributed to the increased congestion effect of GFs that gradually touch and overlap each other with increasing content, so that only a part of their surface remains fully active for crystal nucleation. This leads to the conclusion that 30% of GF is the saturation rate of PA66; the same behavior was observed by Layachi et al 44 in the case of iPP/-Talc.…”

Section: Thermal Behaviorsupporting

confidence: 83%

“…Figure 5 shows the variation of the relative crystallinity X (T) of the PA66 composites with various GF charge ratio and different cooling rates. The crystallization time, t, can be calculated by the following equation 14,43,44 where t is the crystallization time and Φ is the cooling rate.

Figure 5.Relative crystallinity X(T) as a function of the temperature observed for different cooling rates and different loading ratios in GF.…”

Section: Resultsmentioning

confidence: 99%

Section: Thermal Behaviormentioning

confidence: 99%

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Structural study and thermal behavior of composites: Polyamide 66/glass fibers: The reinforcement ratio effect on the kinetics of crystallization

Makhlouf¹,

Layachi

Kouadri³

et al. 2019

Journal of Composite Materials

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The present research aims at studying the kinetics of non-isothermal crystallization of the polyamide 66 matrix and its composites with the presence of a glass fiber load. To achieve that goal, the non-isothermal crystallization of polyamide 66 has been studied by means of DSC. The ratio of tested reinforcement varies from 7% to 50% of glass fiber in mass. The modeling, by the theories of Jeziorny and those of Mo, has allowed us to study the influence of adding this reinforcement, as well as the variation of the rate of cooling, on the kinetics of crystallization of the composites in question, which has been manifested by a remarkable change in the nucleation mechanism of the polyamide 66 matrix. Regarding the reinforcement effect, the incorporation of the glass fibers load into the polyamide 66 matrix has caused the appearance of exothermic peaks in a higher temperature range and that for all the working materials. Finally, the results showed that the Mo model is the most suitable for the study of polyamide 66/glass fiber crystallization kinetics.

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“…This leads to the conclusion that 30% of GF is the saturation rate of PA66; the same behavior was observed by Layachi et al. 44 in the case of iPP/μ-Talc.…”

Section: Resultssupporting

confidence: 82%

Section: Thermal Behaviorsupporting

confidence: 83%

Figure 5.Relative crystallinity X(T) as a function of the temperature observed for different cooling rates and different loading ratios in GF.…”

Section: Resultsmentioning

confidence: 99%

Section: Thermal Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Structural study and thermal behavior of composites: Polyamide 66/glass fibers: The reinforcement ratio effect on the kinetics of crystallization

Makhlouf¹,

Layachi

Kouadri³

et al. 2019

Journal of Composite Materials

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“…Thus, this caused the increment in the degree of crsytallinity at this content. However, the further addition of 45 µm of ulexite into the IPP matrix caused the consistent decreasing of the percent crystallinity of the composites [41]. This was attributed that the high content of ulexite in the IPP matrix probably led up the reduction of free volume of the matrix due to filler effect of ulexite.…”

Section: 1thermal Analysis Of Ipp Based Compositesmentioning

confidence: 97%

Role of boron mineral size on thermal, microstructural and mechanical characteristic of IPP

Soykan

2020

Sakarya University Journal of Science

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This study paves to way to investigate the fundamental characteristics including the crystalline melting temperature, percent crystallinity, crystal structure, unit cell parameters, crystal size, mechanical behavior, ultimate strength, Modulus and impact strength in the IPP based composites formed by blending of IPP with the varying content levels (5, 10, 15, 20 and 30%) of ulexites having different particle sizes (45 and 75 µm). The characterizations of the prepared IPP based composites containing ulexite were performed by means of conventional measurement methods such as Differential Scanning Calorimeter (DSC), X-ray diffractions and several mechanical tests. The obtained results depicted that the content and particle size of boron mineral presenting in IPP based composites had significant effects on the crucial properties of IPP. Namely, the crystalline melting temperature of IPP increased initially (from 165.46°C to 168.54°C) when adding 5% of 45 µm ulexite into IPP and then, dramatic decrease was observed with the content increment. The addition of 75 µm ulexite into to IPP matrix led to consistent decreasing of crystalline melting temperatures of IPP domains. Furthermore, a and b unit cell dimensions of monoclinic structures initially showed the expansions. The maxima of a parameters were found to be 6.683Å and 6.645Å, while the maxima of b were calculated as 20.845Å and 20.793Å for the 45µ and 75 µm ulexites, respectively, but then contracted consistently with the increasing of ulexite content. The serious decrement in c unit cell parameter was observed with the increasing of ulexite content for the both particle sizes. Moreover, the remarkable reinforcements were achieved in the ultimate strengths (from 24.99 MPa to 31.20 MPa), Young's Modulus (from 369.60 MPa to 516.05 MPa) and impact strength (from 39.56 MPa to 46,68 MPa) of the IPP based composites with 45 µm ulexite. The maximum improvements in mechanical properties were obtained with the composites containing 5% of 45 µm ulexite and mainly 15% of 75 µm ulexite. These developments presumably were caused from advance in the alignments and orientations of the IPP chains in the matrix due to presence of ulexite particles.

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Non‐isothermal Crystallization Kinetics, Thermal, and Rheological Behavior of Linear/Branched Polypropylene Blends

Macedo

Campos

Lima

et al. 2022

Macromolecular Symposia

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This work aims at evaluating the rheological and thermal properties and non‐isothermal crystallization kinetics of blends of linear homopolymer polypropylene (HPP) and branched polypropylene (BPP). Two linear polypropylene's of different melt flow index (MFI) are used: H301 (10 g per 10 min) and H604 (1.5 g per 10 min); and one BPP (2 g pr 10 min). The rheological result shows that the H301/BPP blends have an increase in complex viscosity proportional to the addition of BPP amount, while for the H604/BPP blends, it is observed a higher influence of H604 on rheological properties. With the addition of 25 wt% of BPP, the strain hardening behavior is observed in the extensional rheology tests of the polymer blend. The DSC results show that the melt temperature and the crystallinity content in blends with BPP are affected by the molecular weight (MW) of the linear polymer. Results suggest that Pseudo‐Avrami/Jeziorny and Mo models can be used to predict the experimental results of crystallization kinetics of the blends with sufficient precision for all systems studied, regardless of MW. Therefore, it is possible to use the blends of HPP/BPP in processes that demand a combination of rheological properties, such as high strain hardening, and fast crystallization.

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Non-isothermal crystallization kinetics and nucleation behavior of isotactic polypropylene composites with micro-talc

Cited by 24 publications

References 61 publications

Structural study and thermal behavior of composites: Polyamide 66/glass fibers: The reinforcement ratio effect on the kinetics of crystallization

Structural study and thermal behavior of composites: Polyamide 66/glass fibers: The reinforcement ratio effect on the kinetics of crystallization

Role of boron mineral size on thermal, microstructural and mechanical characteristic of IPP

Non‐isothermal Crystallization Kinetics, Thermal, and Rheological Behavior of Linear/Branched Polypropylene Blends

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