Thermal characterisation of LDPE and LLDPE blends

Bhardwaj, I. S.; Kumar, Vijai; Palanivelu, K.

doi:10.1016/0040-6031(88)80076-5

Cited by 14 publications

(9 citation statements)

References 20 publications

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“…Degradation was found to be higher for LDPE than for LLDPE. Degradation has been seen as a primary order for LDPE and second order for LLDPE [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…A reduction in the crystallite population across the range where LDPE shows its primary melting peaks (90-110 • C) has been observed, suggesting that a proportion of the lamella had shifted towards a higher melt temperature [37]. DSC has shown that blends of LDPE and LLDPE show different single melting peak endotherms for different compositions in the range 10 to 90 wt% LLDPE [38]. Kinetic data were acquired by least-squares analyses of experimental points obtained by differentiating primary thermograms.…”

Section: Differential Scanning Calorimetery For Lldpe/mesophase Pitch Blendsmentioning

confidence: 99%

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Manufacturing Pitch and Polyethylene Blends-Based Fibres as Potential Carbon Fibre Precursors

2021

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The advantage of mesophase pitch-based carbon fibres is their high modulus, but pitch-based carbon fibres and precursors are very brittle. This paper reports the development of a unique manufacturing method using a blend of pitch and linear low-density polyethylene (LLDPE) from which it is possible to obtain precursors that are less brittle than neat pitch fibres. This study reports on the structure and properties of pitch and LLDPE blend precursors with LLDPE content ranging from 5 wt% to 20 wt%. Fibre microstructure was determined using scanning electron microscopy (SEM), which showed a two-phase region having distinct pitch fibre and LLDPE regions. Tensile testing of neat pitch fibres showed low strain to failure (brittle), but as the percentage of LLDPE was increased, the strain to failure and tensile strength both increased by a factor of more than 7. DSC characterisation of the melting/crystallization behaviour of LLDPE showed melting occurred around 120 °C to 124 °C, with crystallization between 99 °C and 103 °C. TGA measurements showed that for 5 wt%, 10 wt% LLDPE thermal stability was excellent to 800 °C. Blend pitch/LLDPE carbon fibres showed reduced brittleness combined with excellent thermal stability, and thus are a candidate as a potential precursor for pitch-based carbon fibre manufacturing.

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“…Degradation was found to be higher for LDPE than for LLDPE. Degradation has been seen as a primary order for LDPE and second order for LLDPE [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Differential Scanning Calorimetery For Lldpe/mesophase Pitch Blendsmentioning

confidence: 99%

Manufacturing Pitch and Polyethylene Blends-Based Fibres as Potential Carbon Fibre Precursors

2021

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“…Experimental data were analysed using least-squares and the rates of change of the thermograms calculated to provide the necessary kinetic data. The degradation rate of LDPE was found to be a second-order effect [55]. The thermal characteristics of LLDPE/MP blends within the range of between 30 and 90 wt% LLDPE, were explored using DSC.…”

Section: Dsc For Lldpe/mesophase Pitch Blendsmentioning

confidence: 99%

Influence of High-Concentration LLDPE on the Manufacturing Process and Morphology of Pitch/LLDPE Fibres

2021

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A high modulus of elasticity is a distinctive feature of carbon fibres produced from mesophase pitch. In this work, we expand our previous study of pitch/linear low-density polyethylene blend fibres, increasing the concentration of the linear low-density polyethylene in the blend into the range of from 30 to 90 wt%. A scanning electron microscope study showed two distinct phases in the fibres: one linear low-density polyethylene, and the other pitch fibre. Unique morphologies of the blend were observed. They ranged from continuous microfibres of pitch embedded in linear low-density polyethylene (occurring at high concentrations of pitch) to a discontinuous region showing the presence of spherical pitch nodules (at high concentrations of linear low-density polyethylene). The corresponding mechanical properties—such as tensile strength, tensile modulus, and strain at failure—of different concentrations of linear low-density polyethylene in the pitch fibre were measured and are reported here. Thermogravimetric analysis was used to investigate how the increased linear low-density polyethylene content affected the thermal stability of linear low-density polyethylene/pitch fibres. It is shown that selecting appropriate linear low-density polyethylene concentrations is required, depending on the requirement of thermal stability and mechanical properties of the fibres. Our study offers new and useful guidance to the scientific community to help select the appropriate combinations of linear low-density polyethylene/pitch blend concentrations based on the required mechanical property and thermal stability of the fibres.

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“…With higher concentrations of LLDPE the blend starts to experience some inhomogeneous behavior and that explains the appearance of additional shoulder peak at 40% and a second peak at 50% of LLDPE which agrees with the mechanical behavior of the blends at the same percentages. It is noted that the main melting peak remained just above 110˚C for all selected blends and that is constituent with melting point of a polymer blend always appears between those of the individual components [10].…”

Section: Thermal Investigationmentioning

confidence: 99%

Thermal, Mechanical and Rheological Properties of Low Density/Linear Low Density Polyethylene Blend for Packing Application

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Packaging is the subject of considerable commercial development by a variety of organizations around the world. In this study the mechanical, thermal and rheological properties were investigated for different blend ratios of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE). The weight percent of the LDPEs used in the blends were 50, 60, 70, 80 and 90. The polymer blends were prepared in a twin screw extruder to produce a thin sheet (1-mm thickness) similar to the packaging grade. Tensile results showed that the 50/50 composition exhibited the highest stress at break, where the differential scanning calorimetry results indicated a co-crystalline phase in some blends. The results produced by the rheometer revealed the LLDPE effect over the complex viscosity and consequently blend easy processing. The present study conclusively demonstrates that at low weight percent of linear low density polyethylene in the blend displays better properties for packaging application.

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Thermal characterisation of LDPE and LLDPE blends

Cited by 14 publications

References 20 publications

Manufacturing Pitch and Polyethylene Blends-Based Fibres as Potential Carbon Fibre Precursors

Manufacturing Pitch and Polyethylene Blends-Based Fibres as Potential Carbon Fibre Precursors

Influence of High-Concentration LLDPE on the Manufacturing Process and Morphology of Pitch/LLDPE Fibres

Thermal, Mechanical and Rheological Properties of Low Density/Linear Low Density Polyethylene Blend for Packing Application

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