Microcellular foaming of PE/PP blends

Zhang, Ping; Zhou, Nan; Wu, Qing; Wang, Ming Yi; Peng, Xiang

doi:10.1002/app.26071

Cited by 49 publications

(33 citation statements)

References 66 publications

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“…Apart from the basic foaming conditions (temperature, pressure et al), composition of the blends as well as other additives could affect the material properties (such as crystallinity, 18 surface tension, 19,20 melt strength, [21][22][23] solubility and diffusivity of CO 2 24 ) and ultimately determine the foam morphology and properties. [25][26][27][28][29][30][31] For example, Rachtanapun et al 32 have found that PP/HDPE ¼ 30/70 blends, prepared by twin screw extruder at 100 rpm using CO 2 as blowing agent, exhibit poor foam morphology.…”

Section: Introductionmentioning

confidence: 99%

Interplay between the composition of LLDPE/PS blends and their compatibilization with polyethylene-graft-polystyrene in the foaming behaviour

et al. 2015

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Polyethylene-g-polystyrene (PE-g-PS) copolymers, which were prepared by the combination of the ROMP and ATRP method, were utilized to compatibilize LLDPE/PS blends. On one hand, the effect of PE-g-PS on the morphologies of LLDPE/PS blends was investigated. On the other hand, the influences of branch length and added amount of PE-g-PS on the cell morphology of foamed LLDPE/PS blends with different compositions were studied using supercritical CO 2 as a physical foaming agent in a batch foaming process. It was found that the presence of PE-g-PS in the LLDPE/PS blends showed different influences on the foaming behaviour, strongly depending on the composition of the blends (i.e. the weight ratio of LLDPE and PS). How the interplay of compatibilization and composition of the LLDPE/PS blends affected the foaming behaviour of the LLDPE/PS blends was studied. A reasonable explanation was ascribed to consecutive states of the interfacial region, resulting from different phase structures of the blends. Compared to pristine LLDPE and PS, the blends with a sea-island phase structure showed the improved foam morphology, but the presence of PE-g-PS did not strongly influence the foaming behaviours of these blends. In contrast, the presence of PE-g-PS dramatically promoted the foaming ability of LLDPE/PS blends with a co-continuous phase structure. It was ascribed to the strengthened interfacial adhesion blocking the channel between two components through which CO 2 was released, and the viscoelasticity of the blends was not the key factor to determine the foaming behaviour under the same foaming conditions in this work.

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Section: Introductionmentioning

confidence: 99%

Interplay between the composition of LLDPE/PS blends and their compatibilization with polyethylene-graft-polystyrene in the foaming behaviour

et al. 2015

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“…Table 1 summarized the weight ratios of PLA composites. A self-design batch-foaming setup was used in this study [14,15] . The carbon supercritical dioxide was used as blowing agent with a continuous gas pressure of 15 MPa.…”

Section: Composites Preparationmentioning

confidence: 99%

Batch-foamed biodegradable polylactide acid/organic modified montmorillonite clays and polylactide/sericite powder nanocomposites

Chen¹,

Liu

2012

Journal of Polymer Engineering

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The properties of microcellular polylactic acid (PLA)/organic modifi ed montmorillonite (OMMT) clays and PLA/sericite powder (SP) nanocomposites were investigated and compared in terms of thermal property, rheological property, particles dispersability, and cell microstructure. The batch-foaming process uses carbon dioxide as the physical blowing agent. According to the transmission electron microscopy and X-ray diffraction characterization, fi llers (i.e., OMMT and SP) have good dispersions in PLA matrices. The thermal and rheological properties of solid PLA composites are demonstrated by differential scanning calorimetry and capillary rheometer, respectively. The microcellular morphology of fractured cross-sectional surfaces is characterized by scanning electron microscope. The batch-foamed PLA composites have more uniform cells in comparison with foamed pure PLA parts due to the mineral particles.

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“…[7][8][9][10][11] Rare earth elements have also been reported to be capable of modifying the primary Mg 2 Si particles. [12] Recently, P was added to the composite and the results show a great change in size and morphology of primary particles and a transition from flakes to fibers in the eutectic structure. [13] Assuming an analogy with the modification of Al-Si alloys by such elements as Na and Sr, a refinement of the microstructure is expected to result in an improvement of the mechanical properties.…”

Section: Introductionmentioning

confidence: 98%

“…So far the finest size of primary Mg 2 Si particle reported in the literature is about 8 lm. [12] The objective of the present study is to evaluate the tensile properties of Al-15 pct Mg 2 Si composites and fracture characteristics of the material with the addition of up to 0.3 pct Li.…”

Section: Introductionmentioning

confidence: 99%

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

Hadian

Emamy

Campbell

2009

Metall Mater Trans B

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The effects of both Li modification and cooling rate on the microstructure and tensile properties of an in-situ prepared Al-15 pct Mg 2 Si composite were investigated. Adding 0.3 pct Li reduced the average size of Mg 2 Si primary particles from~30 to~6 lm. The effect of cooling rate was investigated by the use of a mold with different section thicknesses from 3 to 9 mm. The results show a refinement of primary particle size as a result of both Li additions and cooling rate increases, and their effects are additive. Similarly, both effects increased ultimate tensile stress (UTS) and elongation values. The thin sections show somewhat unexpectedly low and scattered tensile results attributed to the casting defects observed in fracture surfaces. The Li-modified alloy displays serrated yielding behavior that is not fully explained here. The refinement by Li and enhanced cooling rate is explained in terms of an analogy with the effect of Sr and cooling rate in Al-Si alloys, and is ultimately attributed to the effect of the alkali and alkaline earth metals deactivating oxide double films (bifilms) suspended in Al melts as favored substrates for intermetallics.

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Microcellular foaming of PE/PP blends

Cited by 49 publications

References 66 publications

Interplay between the composition of LLDPE/PS blends and their compatibilization with polyethylene-graft-polystyrene in the foaming behaviour

Interplay between the composition of LLDPE/PS blends and their compatibilization with polyethylene-graft-polystyrene in the foaming behaviour

Batch-foamed biodegradable polylactide acid/organic modified montmorillonite clays and polylactide/sericite powder nanocomposites

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

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