Physical Foaming and Crosslinking of Polyethylene with Modified Talcum

Kaltenegger-Uray, Anna; Rieß, Gisbert; Lucyshyn, Thomas; Holzer, Clemens; Kern, Wolfgang

doi:10.3390/polym11091472

Cited by 16 publications

(11 citation statements)

References 30 publications

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“…Talc has previously been added to polyolefins in IM as it has been shown to improve the mechanical properties, melt viscoelasticity and promote crystallisation without hindering the processabilities of such polymers as PP. 107,108 Also, the addition of talc to polyolefins in MIM has been seen to improve the polymer melt viscoelasticity and promote crystallisation of the polymer matrix. [109][110][111][112] Other nucleating agents that have been shown to enhance the crystallisation of polyolefins are that of GFs, 14 nanoclay 113 and also 1,3:2,4 bis-O-(4methylbenzylidene)-D-sorbitol gelling agent (MD).…”

Section: Materials Alterationmentioning

confidence: 99%

Advances in microcellular injection moulding

Llewelyn

Rees

Griffiths

et al. 2020

Journal of Cellular Plastics

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Injection moulding is a well-established replication process for the cost-effective manufacture of polymer-based components. The process has different applications in fields such as medical, automotive and aerospace. To expand the use of polymers to meet growing consumer demands for increased functionality, advanced injection moulding processes have been developed that modifies the polymer to create microcellular structures. Through the creation of microcellular materials, additional functionality can be gained through polymer component weight and processing energy reduction. Microcellular injection moulding shows high potential in creating innovation green manufacturing platforms. This review article aims to present the significant developments that have been achieved in different aspects of microcellular injection moulding. Aspects covered include core-back, gas counter pressure, variable thermal tool moulding and other advanced technologies. The resulting characteristics of creating microcellular injection moulding components through both plasticising agents and nucleating agents are presented. In addition, the article highlights potential areas for research exploitation. In particular, acoustic and thermal applications, nano-cellular injection moulding parts and developments of more accurate simulations.

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Section: Materials Alterationmentioning

confidence: 99%

Advances in microcellular injection moulding

Llewelyn

Rees

Griffiths

et al. 2020

Journal of Cellular Plastics

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“…Physical crosslinking is a crosslinking method involving interactions such as the entanglement of chains or ionic bonds between chains. Chemical crosslinking is provided by chemical bonds (such as covalent bonding) between molecular chains [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. In particular, among the chemical crosslinking methods, the radiation crosslinking method has the advantage that a reaction is induced without the use of a chemical additive, such as a crosslinking agent or initiator.…”

Section: Introductionmentioning

confidence: 99%

Radiation-Based Crosslinking Technique for Enhanced Thermal and Mechanical Properties of HDPE/EVA/PU Blends

Lee

Jeong

et al. 2021

Polymers

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Crosslinking of polyolefin-based polymers can improve their thermal and mechanical properties, which can then be used in various applications. Radiation-induced crosslinking can be done easily and usefully by irradiation without a crosslinking agent. In addition, polymer blending can improve thermal and mechanical properties, and chemical resistance, compared to conventional single polymers. In this study, high-density polyethylene (HDPE)/ethylene vinyl acetate (EVA)/polyurethane (PU) blends were prepared by radiation crosslinking to improve the thermal and mechanical properties of HDPE. This is because HDPE, a polyolefin-based polymer, has the weaknesses of low thermal resistance and flexibility, even though it has good mechanical strength and machinability. In contrast, EVA has good flexibility and PU has excellent thermal properties and wear resistance. The morphology and mechanical properties (e.g., tensile and flexure strength) were characterized using scanning electron microscopy (SEM) and a universal testing machine (UTM). The gel fraction, thermal shrinkage, and abrasion resistance of samples were confirmed. In particular, after storing at 180 °C for 1 h, the crosslinked HDPE-PU-EVA blends exhibited ~4-times better thermal stability compared to non-crosslinked HDPE. When subjected to a radiation dose of 100 kGy, the strength of HDPE increased, but the elongation sharply decreased (80%). On the other hand, the strength of the HDPE-PU-EVA blends was very similar to that of HDPE, and the elongation was more than 3-times better (320%). Finally, the abrasion resistance of crosslinked HDPE-PU-EVA was ~9-times better than the crosslinked HDPE. Therefore, this technology can be applied to various polymer products requiring high heat resistance and flexibility, such as electric cables and industrial pipes.

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“…The bands 100 and 670 cm −1 can be associated with SiO‐oscillations. A second band at 400 cm −1 correlates to SiO‐bending vibrations 49 …”

Section: Resultsmentioning

confidence: 99%

Influence of E‐beam irradiation on compounds from linear low density polyethylene and thermoplastic vulcanized rubber consisting of a polypropylene and ethylene propylene diene monomer rubber phase

Krieg

Sergeieva

Jungkind

et al. 2023

J of Applied Polymer Sci

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Linear low-density polyethylene (LLDPE) crosslinks under irradiation in the range of up to 250 kGy. Crosslinking leads to better chemical and thermal resistance but causes reduction in mechanical performance. To counter this reduction, compounds of LLDPE with thermoplastic elastomers (TPV) were made. Specimens were irradiated with doses reaching from 99 to 231 kGy. Gel content shows a decrease of around 12% for compounds with 20 wt% of TPV compared to pure LLDPE. It is also found that compounds containing 10 wt% TPV experience a 4% higher gel content than predicted. For higher amounts of TPV elongation at break increases from 689% for pure LLDPE to 769% and tensile strength decreases from 31.9 to 30.5 MPa. Under irradiation, a trend to lower elongations and tensile strengths is observed. Elongation at break decreased around 200% and tensile strength around 5 MPa under irradiation. Thermal analysis of TPV showed that while the melting temperature decreases, its crystallinity first rises for doses up to 165 kGy before decreasing. Infrared spectroscopy was used to identify changes in the chemical structure, where evidence of surface oxidation under irradiation is found for all compounds with LLDPE.

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Physical Foaming and Crosslinking of Polyethylene with Modified Talcum

Cited by 16 publications

References 30 publications

Advances in microcellular injection moulding

Advances in microcellular injection moulding

Radiation-Based Crosslinking Technique for Enhanced Thermal and Mechanical Properties of HDPE/EVA/PU Blends

Influence of E‐beam irradiation on compounds from linear low density polyethylene and thermoplastic vulcanized rubber consisting of a polypropylene and ethylene propylene diene monomer rubber phase

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