Evaluating melt foamability of LLDPE/LDPE blends with high LLDPE content by bubble coalescence mechanism

Zhang, Hong; Liu, Tao; Li, Bin; Li, Hui; Jin, Geng; Zhao, Ling; Xin, Zhong

doi:10.1016/j.polymer.2020.123209

Cited by 13 publications

(5 citation statements)

References 51 publications

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“…Thus foam coalescence was hampered, and the foaming ability and foam stability were increased. 45 Recently, Zhu et al demonstrated an improvement in foaming property of solution using carboxymethyl cellulose, and a similar conclusion was obtained. 27 However, when trehalose and MG-11S generate molecular crowding, the addition of trehalose decreased the viscoelasticity of the solution, which is not conducive to the formation of foam.…”

Section: Analysis Of Foaming Property For Mg-11s-trehalose Complexesmentioning

confidence: 54%

“…When hydrogen bonding was the main force between trehalose and MG‐11S, the addition of trehalose increased the viscosity of the solution, downregulated the liquid flow in the liquid film, delayed the water expelled and reduced the dilution rate of the liquid film. Thus foam coalescence was hampered, and the foaming ability and foam stability were increased 45 . Recently, Zhu et al .…”

Section: Resultsmentioning

confidence: 99%

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The interaction of trehalose and molten globule state soybean 11S globulin and its impact on foaming capacities

Zhu

Fan

et al. 2022

J Sci Food Agric

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BACKGROUND: Soybean 11S globulin has good functional properties, which are widely used in the field of food. However, natural soybean 11S globulin (N-11S) has low flexibility and is easy to aggregate, impacting its foaming process. Studies have shown that soybean 11S globulin in molten globule state (MG-11S) has better molecular flexibility than N-11S, and trehalose has been shown to improve the properties of proteins. Therefore, this study investigated the interaction mechanism between trehalose and MG-11S, and its impact on rheological and foaming properties of MG-11S. RESULTS:The molecular docking and intrinsic fluorescence results showed that hydrogen bonding was the main interaction force at lower than 0.5 mol L −1 trehalose added. Meanwhile, rheology and foaming showed that the MG-11S-trehalose complexes had better viscoelasticity, foaming ability (66.67-86.67%) and foaming stability (75.00-89.29%) than N-11S (16.67% foaming ability and 40.00% foaming stability); however, when the trehalose was higher than 0.5 mol L −1 , molecular crowding occurred and H-bonds were weakened, resulting in reduction of foaming capacities. Microstructure determination showed that trehalose attached to the surface of foam membrane; meanwhile, the foaming structure of the complex with 0.5 mol L −1 trehalose had a thicker liquid film with decreased drainage rate, less agglomeration and disproportionation of foam, illustrating the best foaming ability and foaming stability.CONCLUSION: The results suggested that trehalose at different concentrations can interact with MG-11S through different mechanisms, and improve the foaming capacity of MS-11S. This provided a reference for the application of MS-11S in foaming food.

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Section: Analysis Of Foaming Property For Mg-11s-trehalose Complexesmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

The interaction of trehalose and molten globule state soybean 11S globulin and its impact on foaming capacities

Zhu

Fan

et al. 2022

J Sci Food Agric

View full text Add to dashboard Cite

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“…The SEM images of cells and the corresponding cell size distributions are displayed in Figure 7. Generally, the solid composites have provided both homogeneous and heterogeneous nucleation modes for CO 2 bubbles, the smaller cells early formed by heterogeneous nucleation near the segregated network regions are absorbed into neighboring larger cells formed by homogeneous nucleation in the neat PCL regions, attributed to the existence of pressure gradient difference between two kinds of cells during the foaming process 47 . In Figure 7a,b, the foamed PCL/CB 0 composite presents the nonuniform cells with thin walls, resembling the morphological characteristics of foamed pure PCL (Figure S6), for that the amount of incorporated CNC is very limited, performing little influence on the SCCO 2 foaming process.…”

Section: Resultsmentioning

confidence: 99%

Preparation of microcellular polycaprolactone/cellulose nanocrystal/carbon black conductive composites using the Pickering emulsion method combined with supercritical batch foaming technology

Huang,

Li,

Liu

et al. 2023

J of Applied Polymer Sci

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The “two‐step” strategy composed of Pickering emulsion method and supercritical batch foaming technology is successfully conducted to prepare the microcellular polycaprolactone (PCL)/cellulose nanocrystal (CNC)/carbon black (CB) conductive composites. Benefitting from the segregated CNC/CB networks established in the PCL matrix, the obtained microcellular conductive composites can present improved electrical and mechanical performance, and uniform foam structures. The percolation threshold (φc) is estimated as low as ~0.84 wt%, and the minimum tensile strain and strength belonging to the foamed composite with 10 wt% of CB content still maintain 15% and 3.95 MPa, respectively. This study hopes to provide an attempt to prepare microcellular conductive composites with great comprehensive performance.

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“…Long branched chain (LCB) structures [25][26][27][28] are beneficial in foaming as providing more entanglement sites and can inhibit overgrowth of bubbles to regulate the cellular structure. 29,30 LDPE is an excellently expandable material, 31,32 which is also related to the existence of LCB in its molecules. The recyclability of LDPE on foaming can be highly expected.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal-oxidative and mechanical degradation of recycled LDPE on foaming

Zou,

Lu,

Zhou

et al. 2024

Cellular Polymers

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In this study, we investigated the effect of recycling process on the molecular structure, viscoelasticity and foaming behavior of low density polyethylene (LDPE). A series of LDPE samples with different recycling process was prepared by multiple extrusion using a twin-screw extruder. The molecular weight distribution (MWD) was characterized by gel permeation chromatography (GPC). Wider MWD indicated the generation of higher molecular weight products. Small-amplitude oscillation rheology showed reduced loss factors, indicating that the chain entanglement was more difficult to relax. Moreover, nonlinear viscoelasticity was investigated using elongational rheology and molecular stress function (MSF) model. The results showed a steeper strain hardening exhibited in recycled LDPE. The correlated parameter β in the MSF model indicated that the recycling did not significantly change the branches regularity in LDPE, while the increasing [Formula: see text], the other correlated parameter, indicated that the chain entanglement was enhanced, which was corresponded to the improvement of high molecular weight component. The foaming results revealed that the recycled LDPE had finer cellular structure and higher nucleation density. Moreover, despite adding PP and active CaCO3 to simulate the impurities, the foamability loss of these mixed samples was well restricted and still valuable. Recycled LDPE is instead better than its corresponding virgin one in foaming performance, exhibiting the application potential for further developments.

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Evaluating melt foamability of LLDPE/LDPE blends with high LLDPE content by bubble coalescence mechanism

Cited by 13 publications

References 51 publications

The interaction of trehalose and molten globule state soybean 11S globulin and its impact on foaming capacities

The interaction of trehalose and molten globule state soybean 11S globulin and its impact on foaming capacities

Preparation of microcellular polycaprolactone/cellulose nanocrystal/carbon black conductive composites using the Pickering emulsion method combined with supercritical batch foaming technology

Effect of thermal-oxidative and mechanical degradation of recycled LDPE on foaming

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