Isothermal crystallization kinetics of glass fiber and mineral-filled polyamide 6 composites

Şanlı, Selen; Durmuş, Ali; Ercan, Nevra

doi:10.1007/s10853-011-6137-9

Cited by 27 publications

(28 citation statements)

References 29 publications

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“…reported by a few literatures for the kinetic study of crystallisation for pure PA6 [34,61], it is much higher than the value ( = 0.4 − 2.1) identified by Kim et al [7] in the crystallisation study for APCL system. It may be worth to mention that the Avrami model (theoretical base for Kim model) is derived for rods, discs and spherulites, representing one, two, threedimensional forms of crystal growth.…”

Section: Crystallisation Kineticsmentioning

confidence: 52%

“…The validity of Avrami model on the modelling isothermal crystallisation of PA6 has been well presented in literatures [33][34][35][36].…”

Section: Avrami Modelmentioning

confidence: 85%

“…• Extensively used in literatures for crystallisation kinetic modelling of semi-crystalline polymers [34,35,59]. …”

Section: Crystallisation Kinetic Modelsmentioning

confidence: 99%

“…The Arvami model, the most widely used crystallisation kinetic model for semi-crystalline polymers, has proved to be effective in modelling isothermal crystallisation process for pure PA6 [34,35]. However, the simultaneous polymerisation and crystallisation during APCL have made the modelling of crystallisation difficult.…”

Section: Crystallisation Kineticsmentioning

confidence: 99%

“…The isothermal crystallisation under different processing conditions were fitted to Kim model by MATLAB curve fitting App-cftool. The fitting parameters were restricted to literature value ranges [34,35] The high coefficient of determination (>99.5%) given in Table 5-8 indicate that robust fitting between Kim model and all experiment data is achieved, whereas large variance of and is observed in the Table 5-9. represents the crystallisation induction time, which is the time difference between the start of polymerisation and crystallisation.…”

Section: Crystallisation Kineticsmentioning

confidence: 99%

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Anionic polymerisation of caprolactam: process monitoring and reaction kinetic studies

Yang¹

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Reactive processing of PA6 (in-situ anionic polymerization of caprolactam-APCL) enables the production of high performance composite with high mechanical property, good weldability, and recyclability for structural, aerospace and automotive applications.Compare to melt processing, reactive processing enables shorter cycle time, lower processing temperature and pressure. This makes reactive processing a promising new manufacturing technique capable of addressing mass markets.Unfortunately, the insufficient study on influences of processing conditions and reaction kinetics have limited the commercial implementation of the reactive system. This work aims to investigate the processing parameter effect on polymer properties and validate the reaction kinetic models of small scale isothermal polymerization. Experiments were carried out using Differential Scanning Calorimetry (DSC) for the in-situ monitoring of polymerization and crystallization under different processing conditions. Results show that the increase in initiator, activator concentration and polymerization temperature lead to the increase in reaction rate and drop in crystallinity. Whilst this behaviour was expected, the research also shows that the polymer conversion exhibits a far more complex behaviour. For low temperatures, it appears that the monomer conversion is inhibited by early crystallisation whereas for high temperatures the reaction equilibrium shifts towards the monomer state.The derived polymerisation and crystallisation heat flows were used for validation of kinetic models including Kamal-Sourour and Malkin model for polymerisation, Kim model for crystallisation. All experiment data support the validity of Kamal-Sourour model in describing the kinetic development of polymerisation reaction using C1-C20P catalyst system. With the parameters identified from this work, Kamal-Sourour model accurately predict the polymerisation rate under different processing conditions. On the contrast, Malkin polymerisation model failed to give meaningful modelling of the same process. Though Kim crystallisation model gave excellent simulation of the crystallisation process during APCL, the physical meaning of parameter is yet to be determined.

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Section: Crystallisation Kineticsmentioning

confidence: 52%

“…The validity of Avrami model on the modelling isothermal crystallisation of PA6 has been well presented in literatures [33][34][35][36].…”

Section: Avrami Modelmentioning

confidence: 85%

“…• Extensively used in literatures for crystallisation kinetic modelling of semi-crystalline polymers [34,35,59]. …”

Section: Crystallisation Kinetic Modelsmentioning

confidence: 99%

Section: Crystallisation Kineticsmentioning

confidence: 99%

Section: Crystallisation Kineticsmentioning

confidence: 99%

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Anionic polymerisation of caprolactam: process monitoring and reaction kinetic studies

Yang¹

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Investigation of thermal, rheological, and physical properties of amorphous poly(ethylene terephthalate)/organoclay nanocomposite films

Gökkurt

Durmuş

Sarıboğa

et al. 2013

J of Applied Polymer Sci

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Thermal, rheological, and physical properties of amorphous poly(ethylene terephthalate) (PET)/organoclay nanocomposite films which were successfully prepared with melt processing method using a PET/organoclay masterbatch were studied in detail. Structural and physical properties of the films were characterized by the UV-Vis spectroscopy, XRD and SEM analysis, DSC, DMA, and rheological tests and gas permeability measurements. Cold-crystallization behavior of the samples was analyzed by the DSC and DMA methods. Aspect ratio of the organoclay layers were determined with the Nielsen and Halpin-Tsai models based on the gas permeability and DMA data, respectively. It was found that the organoclay reduced the nonisothermal cold-crystallization rate of PET chains by restricting the segmental motion of the polymer in the solid state. On the other hand, the organoclay enhanced the nonisothermal melt-crystallization of PET due to the nucleation effect. Aspect ratio (A f ) of the clay layers were found to be about 20 by using the gas permeability and DMA data. Aspect ratio value was also confirmed by the analysis of SEM images of the samples. A physical model for the sample microstructure was offered that the stacks with the thickness of 20-30 nm and the lateral size of 400-600 nm, probably consisting of 5-8 layers, were uniformly dispersed in the PET structure.

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Chemical bonding and hydrogen bonding facilitated higher interfacial interaction of PA6/BF/POSS composites

Li,

Yu,

Zhang

et al. 2024

J of Applied Polymer Sci

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This work investigated the composites (PA6/BF) made of basalt fiber (BF) and nylon 6. To improve the interfacial bonding between the fibers and the polymer matrix, and to enhance the thermal and mechanical properties of the composites, polyhedral oligosilsesquioxanes (POSS) with epoxide groups was introduced to modify the surface of BFs using the slurry coating method. It is revealed that the mechanical properties of the composites increased and then decreased with increasing POSS coating. The composite PA6/BF‐POSS3 with BFs modified with a POSS solution of 3.0 wt% showed the best properties. The tensile strength of PA6/BF‐POSS3 was 130.8 MPa, 26.4% higher than that of the PA6/BF and 126.3% higher than that of neat PA6. In addition, PA6/BF‐POSS3 exhibited a 5% weight loss temperature of 417.7, 35.6°C higher than that of PA6/BF. The chemical bonding formed between the amide and epoxide groups, and the hydrogen bonding formed between the amide groups and hydroxyl groups were believed to be the main reasons for the improved interfacial interaction and improved properties.

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Isothermal crystallization kinetics of glass fiber and mineral-filled polyamide 6 composites

Cited by 27 publications

References 29 publications

Anionic polymerisation of caprolactam: process monitoring and reaction kinetic studies

Anionic polymerisation of caprolactam: process monitoring and reaction kinetic studies

Investigation of thermal, rheological, and physical properties of amorphous poly(ethylene terephthalate)/organoclay nanocomposite films

Chemical bonding and hydrogen bonding facilitated higher interfacial interaction of PA6/BF/POSS composites

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