Isothermal and Non-Isothermal Crystallization Kinetics of Poly(ethylene chlorotrifluoroethylene)

Yang, Xiaodong; Yu, Bingxin; Sun, Hui; Wang, Nan; Liu, Peng; Feng, Jiangli; Cui, Xiaogang

doi:10.3390/polym14132630

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…In the present study, the crystallisation kinetics of the investigated material is analysed using the well-established Nakamura model [6,[17][18][19]. This model allows the description of non-isothermal crystallisation in its differential form:…”

Section: Semi-empirical Characterisation Of Crystallisation Kineticsmentioning

confidence: 99%

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Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Leubecher,

Brier,

Vitale

et al. 2024

Materials

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Large-Scale Material Extrusion (LS-MEX) is increasingly being used in small-scale production and prototyping due to its ability to create components in new temporal and spatial dimensions. However, the use of this manufacturing process poses microscopic and macroscopic challenges not encountered in previous small-scale production systems. These challenges arise primarily from the prolonged retention of heat in the material, which leads to insufficient strength in the extruded strands at the macrostructural level. As a result, the component can collapse, a phenomenon known as ‘slumping’. Thermal energy also influences microstructural changes, such as crystallisation kinetics, which affect properties such as the strength and stiffness of the final product. The duration and dynamics of thermal energy are influenced by manufacturing parameters and the possible use of additional peripheral equipment, which affects component quality. In this study, the influence of thermal energy on structural processes through simulations of polyamide 6 with 40% carbon fibres (PA6 wt.%40 CF) is investigated. The results show that by adjusting the process parameters and using modification units, the thermal profile of the material can be accurately controlled, which allows the microstructural processes to be precisely controlled. This leads to the targeted modification of the macroscopic material properties. The focus of this work is on the combination of numerical simulations of the LS-MEX process with semi-empirical methods for the analysis of crystallisation processes. The application of the Nakamura model, which is used throughout similar investigations, allows a detailed description and prediction of the crystallisation kinetics during the manufacturing process. The study shows that the absolute degree of crystallisation can be determined with simplified assumptions using a combination of thermal simulations and semi-empirical approaches. It was found that the absolute degree of crystallisation increases from the outer interface of the strand to the print bed across the cross-section. This can be attributed to the specific thermal boundary conditions and the resulting temperature profiles at different points.

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Section: Semi-empirical Characterisation Of Crystallisation Kineticsmentioning

confidence: 99%

“…Various models in the literature [17][18][19] describe the crystallisation kinetics of semicrystalline thermoplastics based on experimental data from differential scanning calorimetry (DSC). Dörr et al used a modified Nakamura model to describe the non-isothermal crystallisation kinetics, as described in detail in [17].…”

Section: Introductionmentioning

confidence: 99%

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Leubecher,

Brier,

Vitale

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…[15][16][17] The crystallization behavior of polymer can be categorized into two major classes: isothermal and nonisothermal crystallization. 18,19 Isothermal crystallization occurs when the polymer sample is kept at a constant temperature and its crystallization behavior is controlled by temperature. Conversely, nonisothermal crystallization occurs when the polymer specimen undergoes the different cooling rate.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization kinetic behavior of pure ethylene-Vinyl acetate copolymers and ethylene-Vinyl acetate copolymer/nitrile rubber thermoplastic vulcanizate

Zhang

Gao

Wang

et al. 2023

Journal of Thermoplastic Composite Materials

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Thermoplastic vulcanizate (TPV) made from the ethylene-vinyl acetate copolymer (EVA)/nitrile rubber (NBR) blend was fabricated using the dynamic vulcanization method. Differential scanning calorimetry (DSC) was utilized to analyze the nonisothermal crystallization kinetics of both pure EVA and EVA/NBR TPV. The nonisothermal crystallization mechanism was evaluated using the Avrami method modified by Jeziorny, the Ozawa method and the Mo method. The results demonstrate that the nonisothermal crystallization of both pure EVA and EVA/NBR TPV can be adequately described by the Avrami method modified by Jeziorny and the Mo method, while the Ozawa method is not applicable. By elevating the cooling rate, there was a reduction in the crystallization temperature and t1/2 for both pure EVA and EVA/NBR TPV, while the degree of crystallization increased. At the same cooling rate, the crystallization temperature of the EVA/NBR TPV was found to be higher than that of the pure EVA, suggesting that the presence of NBR facilitated the nucleation of the EVA matrix within the EVA/NBR TPV. Moreover, a steric hindrance effect existed in the NBR phase of EVA/NBR TPV at the same cooling rate, resulting in a larger t1/2 compared to that of the pure EVA, indicating hindered crystal growth.

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Exploring the self-nucleation effect: Transforming crystalline morphology for improved mechanical performance of carbon fiber reinforced polyphenylene sulfide composites

Ren,

Yu,

et al. 2024

Composites Part B: Engineering

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Isothermal and Non-Isothermal Crystallization Kinetics of Poly(ethylene chlorotrifluoroethylene)

Cited by 5 publications

References 49 publications

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Nonisothermal crystallization kinetic behavior of pure ethylene-Vinyl acetate copolymers and ethylene-Vinyl acetate copolymer/nitrile rubber thermoplastic vulcanizate

Exploring the self-nucleation effect: Transforming crystalline morphology for improved mechanical performance of carbon fiber reinforced polyphenylene sulfide composites

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