Improving the integration of HDPE/UHMWPE blends by high temperature melting and subsequent shear

Shen, Hongwang; He, Lei; Fan, Chunhua; Xie, Bin; Yang, Wei; Yang, Ming‐Bo

doi:10.1016/j.matlet.2014.10.013

Cited by 26 publications

(21 citation statements)

References 22 publications

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“…There is a large body of work dedicated to exploring various methods such as melt blending , solution blending , in‐reactor blending , and some unorthodox techniques which would give UHMWPE‐HDPE blends of optimum mechanical properties. While the large chain length of UHMWPE is necessary to improve the properties of the blend, the same large chain length is also the biggest impediment in blending UHMWPE in HDPE.…”

Section: Introductionmentioning

confidence: 99%

The effect of processing conditions on the rheological properties of blends of ultra high molecular weight polyethylene with high‐density polyethylene

Chaudhuri

Poddar

Pol

et al. 2018

Polymer Engineering & Sci

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Blends of high‐density polyethylene (HDPE) with small amounts of ultra‐high molecular weight polyethylene (UHMWPE) were prepared by melt mixing in a twin‐screw microcompounder. Two types of UHMWPE differing in their states of chain entanglement were used. The blend composition, time of mixing, and rotation speed of the screws were varied. Rheological properties of the blends were studied in oscillatory shear and uniaxial elongational tests. Reduction in phase angle measured in dynamic shear rheology and increase in extensional strain hardening were found to be useful indicators for quantifying the extent of mixing of the two components. Although the disentangled UHMWPE showed reasonable mixing with HDPE during typical residence times of melt compounding operations, the entangled UHMWPE remained essentially undissolved. The extent of mixing increased with mixing time and screw speed. POLYM. ENG. SCI., 59:821–829, 2019. © 2018 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

The effect of processing conditions on the rheological properties of blends of ultra high molecular weight polyethylene with high‐density polyethylene

Chaudhuri

Poddar

Pol

et al. 2018

Polymer Engineering & Sci

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“…The changes of viscoelastic behavior indicate the increased ratio of the dispersion of UHMWPE into the HDPE matrix and density of chain entanglements in the HDPE/UHMWPE blends . This might be attributed to the UHMWPE long chains dispersing into the HDPE matrix without chain scission leading to the re‐entanglement of UHMWPE long chains and HDPE molecular chains.…”

Section: Resultsmentioning

confidence: 98%

“…Figure shows that the particle size of neat UHMWPE powder was 200–300 µm. Generally speaking, the UHMWPE particles not dispersed in the matrix appear darker than the HDPE matrix because of fewer scattered incident electrons due to the lower crystallinity of UHMWPE . Therefore, the shape, size and quantity of dark area can be used to analyze the dispersion of UHMWPE in the matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, the impact resistance of HDPE modified with UHMWPE composition is higher than that of pure HDPE, although pure HDPE already has a high value of impact strength . However, Krishnaswamy et al suggested that the phase segregation area in the HDPE/UHMWPE blends absorbed impact energy and the increased UHMWPE loading improved the compatibility of blends which reduced the phase segregation area, resulting in the rate of increase in impact strength of blends decreasing with increasing mass ratio of UHMWPE.…”

Section: Resultsmentioning

confidence: 99%

“…Little melting UHMWPE could diffuse into the HDPE matrix, while diffused UHMWPE chains could play a role in toughening and nucleating as well as improving the abrasion resistance of the matrix . Some researchers employed the two‐step processing method to prepare effective dispersed HDPE/UHMWPE blends which presented an improvement in mechanical properties . Those investigations achieved good dispersion of UHMWPE in the HDPE matrix with the assistance of pre‐ or post‐processing compared to the single mixing process; however, these are not yet continuous and economical processing techniques for industrial production due to the long time and large energy consumption.…”

Section: Introductionmentioning

confidence: 99%

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Short‐time fabrication of well‐mixed high‐density polyethylene/ultrahigh‐molecular‐weight polyethylene blends under elongational flow: morphology, mechanical properties and mechanism

Lin

Yang

2019

Polymer International

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As linear polyethylenes, ultrahigh‐molecular‐weight polyethylene (UHMWPE) and high‐density polyethylene (HDPE) have the same molecular structure, but the large difference in viscosity between them makes it difficult to obtain well‐mixed blends. An innovative eccentric rotor extruder (ERE) generating an elongational flow was used to prepare HDPE/UHMWPE blends within short processing times. Compared with the obvious two‐phase morphology of a sample from a twin‐screw extruder observed with a scanning electron microscope, few small UHMWPE particles were observed in the HDPE matrix for a sample from the ERE, indicating the good mixing on a molecular level of HDPE/UHMWPE blends achieved by the ERE during short processing times. The morphological changes of blends prepared using the ERE evidenced the good integration of HDPE and UHMWPE even though the UHMWPE content is up to 50 wt% in the blends. Moreover, all blends retained most of the intrinsic molecular weight. The good mixing was further confirmed from the thermal, crystallization and rheological behaviors determined using differential scanning calorimetry and dynamic rheological measurements. Importantly, the 50/50 blend presented improved mechanical properties, especially super‐impact strength of 151.9 kJ m−2 with incomplete‐break fracture state. The strengthening and great toughening effects of UHMWPE on the blends were attributed to the addition of unwrapped UHMWPE long molecular chains. The effective disentanglement mechanism of UHMWPE chains under elongational flow was explained schematically by a non‐parallel three‐plate model. © 2019 Society of Chemical Industry

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Healing phenomenon adapted to understand the miscibility of polymer blends: An approach based on the deformation mechanism

Ferreira

Fechine

2020

J of Applied Polymer Sci

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Following many years of studies on polyethylene blends, several indirect classical experimental methods (DSC, XRD, DMA, cryogen fracture surface using SEM, and Rheological Test in Oscillatory Flow) have been used to evaluate the compatibility between polyethylene blends. Here a study of a high‐density polyethylene (HDPE)—ultrahigh molecular weight polyethylene (UHMWPE) system, which evidences that the compatibility of mixtures using these experimental methods does not assure good mechanical performance of the blends. In addition, the potential that these blends can perform mechanically may be overestimated. Based on the theory of healing at a polymer‐polymer interface, it was shown that the maximum mechanical performance of the HDPE‐UHMWPE blend can be obtained for long time molecular diffusion when the mixtures equilibrium (maximum mixing degree) at the HDPE‐UHMWPE interphase is achieved. The degree of mixture at the HDPE‐UHMWPE interphase was assessed indirectly by the deformation mechanism that each phase and the interphase plays during the tensile test (at solid state). The advances reported in this paper can contribute to understanding the mechanical performance of different systems formed by compatible polyethylene blends.

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Improving the integration of HDPE/UHMWPE blends by high temperature melting and subsequent shear

Cited by 26 publications

References 22 publications

The effect of processing conditions on the rheological properties of blends of ultra high molecular weight polyethylene with high‐density polyethylene

The effect of processing conditions on the rheological properties of blends of ultra high molecular weight polyethylene with high‐density polyethylene

Short‐time fabrication of well‐mixed high‐density polyethylene/ultrahigh‐molecular‐weight polyethylene blends under elongational flow: morphology, mechanical properties and mechanism

Healing phenomenon adapted to understand the miscibility of polymer blends: An approach based on the deformation mechanism

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