DIRECT CENTRIFUGAL MOLDING OF NYLON 6-Based PRODUCTS FROM Ε-Caprolactam

Rusu, Gh.; Rusu, Mihai; Rusu, Elena; Stoleriu, A.; Teacă, Carmen‐Alice

doi:10.1081/ppt-100100026

Cited by 28 publications

(23 citation statements)

References 7 publications

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“…It is well known that anionic polymerization of !-CL (APCL) occurs faster (i.e., over a few minutes) than classical hydrolytic polymerization, which takes about 12-24 h [4]. A fast polymerization process in addition to good mechanical properties of PA6 results in a wide range of applications for this polymer in reaction injection molding [5,6], rotational molding [1,7] and centrifugal molding [8][9]. This makes PA6 one of the main engineering materials in use today.…”

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confidence: 99%

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Barhoumi¹,

Maazouz²,

Jaziri³

et al. 2013

Express Polym. Lett.

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A reactive rotational molding (RRM) process was developed to obtain a PA6 by activated anionic ring-opening polymerization of epsilon-caprolactam (APA6). Sodium caprolactamate (C10) and caprolactam magnesium bromide (C1) were employed as catalysts, and difunctional hexamethylene-1,6-dicarbamoylcaprolactam (C20) was used as an activator. The kinetics of the anionic polymerization of !-caprolactam into polyamide 6 was monitored through dynamic rheology and differential scanning calorimetry measurements. The effect of the processing parameters, such as the polymerization temperature, different catalyst/activator combinations and concentrations, on the kinetics of polymerization is discussed. A temperature of 150°C was demonstrated to be the most appropriate. It was also found that crystallization may occur during PA6 polymerization and that the combination C1/C20 was well suited as it permitted a suitable induction time. Isoviscosity curves were drawn in order to determine the available processing window for RRM. The properties of the obtained APA6 were compared with those of a conventionally rotomolded PA6. Results pointed at lower cycle times and increased tensile properties at weak deformation

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confidence: 99%

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Barhoumi¹,

Maazouz²,

Jaziri³

et al. 2013

Express Polym. Lett.

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“…Gmbh), purified according to the literature, [8,[24][25][26][27] and the metallic filler, zinc (Sigma-Aldrich Chem. Gmbh), purified according to the literature, [8,[24][25][26][27] and the metallic filler, zinc (Sigma-Aldrich Chem.…”

Section: Methodsmentioning

confidence: 99%

“…DH o m was assumed to be 191 J g À1, [8,25,26,29] DH m (J g À1 ) is the enthalpy of fusion of the nylon 6 matrix, and W f is the weight fraction of the Zn filler in the nylon composites. DH o m was assumed to be 191 J g À1, [8,25,26,29] DH m (J g À1 ) is the enthalpy of fusion of the nylon 6 matrix, and W f is the weight fraction of the Zn filler in the nylon composites.…”

Section: Synthesis Of Anionic Nylon 6 and Nylon 6/zinc Composite Matementioning

confidence: 99%

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Anionic Nylon 6/Zinc Composite Materials: Evaluation of Thermal and Mechanical Behavior

Rusu¹,

Rusu²

2010

International Journal of Polymer Analysis and Characterization

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This study deals with the experimentally investigated effect of zinc (Zn) particles on the thermal and mechanical properties of nylon 6/zinc composite materials. Nylon 6 and nylon 6 containing 6.0, 8.0, 12.0, 15.0, 20.0, and 25.0 wt.% of unmodified zinc particles, metal-polymer composite materials, were prepared by in situ anionic polymerization of '-caprolactam (CL) in the presence of metallic fillers using rotational molding technique. The characteristics, namely melting temperature, degree of crystallinity (first and second heating scan) and crystallization temperature, crystalline structure, thermal stability, and mechanical properties (flexural modulus, flexural strength, and notched Izod impact strength), of the nylon 6/zinc composites were determined for each sample. Different DSC, ATG, wide-angle X-ray diffraction, and mechanical measurements were performed. The results related to nylon 6 composites were compared with those obtained for pure nylon 6.

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“…reaction injection molding [3], rotational molding [4,5] and centrifugal molding [6,7] which permit direct manufacturing of large and complex shaped plastic parts with a high degree of surface fining and control of the products characteristics . There are a number of problems which are inherent to the processing of reactive monomers and these have been sufficient to limit the development and uptake of the process in industry [8].…”

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confidence: 99%

Reactive rotational molding process of PP/PA6 bilayer systems: experimental investigations

et al. 2008

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Rotational molding is a shear-free and pressure-free process used to manufacture hollow plastic parts with relatively low investment [1]. With the rotational molding industry presently being dominated by powdered plastics, in particular polyethylene with limited properties, moulders are being forced to use other forms of plastic processing. Other resins currently used by the industry such as polycarbonate and nylon offer better properties, but at a cost.Reactive rotational molding (RRM) is an important way to overcome these problems, this process offers manufactures numerous benefits over the conventional powder process including shorter cycle times, lower processing temperatures and improved in material properties [2]. Additionally the use of RRM process allows the synthesis of engineering thermoplastic as polyamide 6 with a high molecular weight through anionic polymerization of caprolactam by the aid of chain initiators and catalyst. The advantage of the anionic polymerization of caprolactam have been put to use in reactive polymerization-molding process, namely Rotational molding has been regarded as a plastic molding method with great potential. The process offers virtually stress free products having no weld lines or material wastage, and utilizes relatively inexpensive molds. Yet its widespread growth is hindered due to long production cycle times, which are limited by the time required to heat up and cool down the mold and the product. This presentation is about the study of making multilayer PP/PA6 parts with the reactive rotational molding process. Different studies have already been made in the past about rotational molding or about reactive process of monolayer part. The aim of this work is to reduce cycle time by making a layer via anionic polymerization of caprolactam, and them to compare each process. This presentation is divided into two parts: the first part deals with rheological, dieclectric aland thermal analysis to investigate the effect of mixtures and the crystallization/polymerization effect; the second part deals with the processing of bilayer parts. Firstly, different mixtures of catalysts and activators were investigated by Rheology and thermal analysis in order to determine which mixture would be the most appropriate for the rotational molding process: 2 2 (2% of activator and 2% of catalyst), 3 3, 4 4 and 6 6. In the second step, different processing investigations have been done in order to study the influences of the parameters like oven time or cooling time. An experimental analysis of heat transfer in reactive rotational molding process was also lead. By using an instrumented mold associated with a radio transmission data acquisition system, we demonstrate that the rotational parts of the bilyar PP/PA6 (reactive way) can be obtained with optimised conditions in correlation with the results of rheology and dielectric measurements. Moreover, the results allows us that it is possible to make bilayer reactive part with the rotational molding process by using less energy in a shorter t...

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DIRECT CENTRIFUGAL MOLDING OF NYLON 6-Based PRODUCTS FROM Ε-Caprolactam

Cited by 28 publications

References 7 publications

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Anionic Nylon 6/Zinc Composite Materials: Evaluation of Thermal and Mechanical Behavior

Reactive rotational molding process of PP/PA6 bilayer systems: experimental investigations

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