Elongation properties of polyethylene melts

Liang, Ji‐Zhao; Zhong, Lei

doi:10.1002/pen.22036

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…As discussed earlier, at all axial locations the GB-500 particle holdup was higher compared to other particles. A similar trend was reported by Liang et al [2] and Zheng et al [6]. GB-500 particles showed relatively larger radial nonuniformities compared to other particles.…”

Section: Radial Distribution At Different Axial Locationssupporting

confidence: 89%

“…The radial non-uniformity in LSCFB was first reported using a conductivity probe [2][3][4] and an optical fibre probe [5]. Zheng et al [1] claimed that the flow structure was affected significantly by operating conditions and physical properties of particles.…”

Section: Introductionmentioning

confidence: 99%

“…They showed radial distribution of the solid holdup under a wide range of operating conditions and tested the effect of particle density on the flow structure. Liang et al [2] and Zheng et al [1,5] claimed that at the same average solid holdup the distribution of solids was more uniform with lighter particles compared to denser particles. Zheng [6] reported that light particles always showed axial uniformity in the flow structure, but the heavy particles showed non-uniformity at the initial zone of the riser.…”

Section: Introductionmentioning

confidence: 99%

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Particle Shape, Density, and Size Effects on the Distribution of Phase Holdups in an LSCFB Riser

2009

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Electrical resistance tomography (ERT) as a non-invasive technique based on conductivity measurement of the continuous phase was employed for the study of phase holdup in a liquid-solid circulating fluidized bed (LSCFB). Local solid holdup was also measured by an optical fibre probe and pressure transducers to compare and verify the results obtained by ERT. Good agreement was observed among the three methods. Tap water was used as the continuous and conductive phase and glass beads (spherical shape) and lava rocks (irregular shape) of two different sizes were used as the solid and non-conductive phase. Radial non-uniformities of solid holdups were observed for all four types of particles under different superficial liquid velocities in different axial locations. The solid holdup was higher in regions close to the wall and low in the central region. Non-uniformity in the phase holdup decreased with increasing liquid velocity. The axial flow profile was found uniform along axial locations of the riser except at the lower location closer to the distributor zone.

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Section: Radial Distribution At Different Axial Locationssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Particle Shape, Density, and Size Effects on the Distribution of Phase Holdups in an LSCFB Riser

2009

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“…The motion units in the as-spun filament melt are whole molecular chains, and the thermal movement of the molecular chains was more active at higher temperatures. The interaction forces between the molecular chains were weakened, and the disentanglement speed was quickened, resulting in the decrease in the melt elongation viscosity [38]. Therefore, the f s value of both the U/H and U as-spun filaments increased with the increase in spinning temperature.…”

Section: Resultsmentioning

confidence: 99%

The influence of formation temperatures on the crystal structure and mechanical properties of ultrahigh-molecular-weight polyethylene/high-density polyethylene-blend fibers prepared by melt spinning

Wang

Liu

Xue

et al. 2019

Journal of Industrial Textiles

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The influence of spinning temperature on ultrahigh-molecular-weight polyethylene/high-density polyethylene as-spun blend filaments and the influence of drawing temperature on ultrahigh-molecular-weight polyethylene/high-density polyethylene-blend fibers were investigated. The results showed that the optimum spinning and hot-drawing temperatures were 310℃ and 85℃, respectively, and blending with high-density polyethylene improved the orienting ability of the molecular chains and the crystallization ability. The blend filaments spun at 310℃ had the best molecular chain orientation, crystallinity and crystal orientation of the filaments examined; both lower and higher spinning temperatures were detrimental to the crystal structure growth of the as-spun blend filaments. The optimum drawing temperature of the blend fibers was 85℃, which resulted in blend fibers with the best molecular chain orientation, crystallization, and crystal orientation as well as the thinnest grains of the fibers examined. The highest tensile strength and initial modulus were 1204 MPa and 20.4 GPa, respectively; these high values can be attributed to the fibrillar structure, which consisted of extended molecular chains and thin grains. The results in this paper can help disclose the effect mechanism of formation temperature on the melt spinning method used to produce high-strength ultrahigh-molecular-weight polyethylene fibers.

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“…It is meaningful for studying the extrudate swell behavior of PP composite melts from the perspectives of polymer processing and rheology. The effects of inorganic fillers, such as calcium carbonate , kaolin , Al(OH) 3 /Mg(OH) 2 , diatomite , hollow glass bead , microencapsulated red phosphorus , and organobentonite , on the extrudate swell behavior of PP composite melts have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

Chen

Zhou

et al. 2015

Polymer Composites

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The extrudate swell behavior of polypropylene (PP) composite melts filled with multi‐walled carbon nanotubes (MWCNTs) was studied using a capillary rheometer in a temperature range from 190 to 230°C and at various apparent shear rates varying from 50 to 800 s−1. It was found that the values of the extrudate swell ratio of the composites increased nonlinearly with increasing apparent shear rates, while the values of the extrudate swell ratio decreased almost linearly with increasing temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, while decreased approximately nonlinearly with an increase of the MWCNT weight fraction. In addition, the extrudate swell mechanisms were discussed with observation of the fracture surface of the extrudate using a scanning electronic microscopy. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable mechanical and thermal properties. POLYM. COMPOS., 38:2433–2439, 2017. © 2015 Society of Plastics Engineers

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Elongation properties of polyethylene melts

Cited by 15 publications

References 15 publications

Particle Shape, Density, and Size Effects on the Distribution of Phase Holdups in an LSCFB Riser

Particle Shape, Density, and Size Effects on the Distribution of Phase Holdups in an LSCFB Riser

The influence of formation temperatures on the crystal structure and mechanical properties of ultrahigh-molecular-weight polyethylene/high-density polyethylene-blend fibers prepared by melt spinning

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

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