A study of crystallisation behaviour and compatibility of high-density polyethylene/linear low-density polyethylene blends

1990 ◽  
Vol 162 (1) ◽  
pp. 163-177 ◽  
Author(s):  
M. Pracella ◽  
E. Benedetti ◽  
F. Galleschi
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Polyethylene Blends ◽  
Crystallisation Behaviour

An experimental study on foaming of linear low-density polyethylene/high-density polyethylene blends

2016 ◽  
Vol 53 (1) ◽  
pp. 83-105 ◽  
Author(s):  
Peyman Shahi ◽  
Amir Hossein Behravesh ◽  
Ali Haghtalab ◽  
Ghaus Rizvi ◽  
Fatemeh Goharpei
Keyword(s):  
Bulk Density ◽  
High Density Polyethylene ◽  
Cell Structure ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Polyethylene Blends ◽  
Wide Range ◽  
Foaming Behavior

In this research work, foaming behavior of selected polyethylene blends was studied in a solid-state batch process, using CO2 as the blowing agent. Special emphasis was paid towards finding a relationship between foamability and thermal and rheological properties of blends. Pure high-density polyethylene, linear low-density polyethylene, and their blends with two weight fraction levels of high-density polyethylene (10 and 25%wt.) were examined. The dry blended batches were mixed using an internal mixer in a molten state, and then the disk-shaped specimens, 1.8 mm in thickness, were produced for foaming purposes. The foaming step was conducted over a wide range of temperatures (120–170℃), and the overall expansion and cellular morphology were evaluated via density measurements and captured SEM micrographs, respectively. Three-dimensional structural images were also captured using a high resolution X-ray micro CT for different foamed samples and were compared. Rheological and DSC tests for the virgin and blends were also performed to seek for a possible correlation with the formability. Based on the results, blended polyethylene foams exhibited remarkable expansion and highly enhanced cell structure compared to pure polymers. Bulk density, as low as 0.33 g/cm3, was obtained for blends, while for the virgin high-density polyethylene  and linear low-density polyethylene, bulk density lower than 0.5 g/cm3 was not attainable. The lowest density was observed at a foaming temperature of 10–20℃ above the melting (peak) temperature obtained via DSC test. Rheological characteristics, including storage modulus and cross-over frequency value, were also found to be the indicators for the materials foaming behavior. Moreover, blends with 25% wt. of high-density polyethylene exhibited the highest expansion values over a wider range of temperature compared with 90% linear low-density polyethylene/10% high-density polyethylene.

Linear low‐density polyethylene/high‐density polyethylene blends: Effect of high‐density polyethylene content on die swell and flow instability

2020 ◽  
Vol 138 (9) ◽  
pp. 49910
Author(s):  
Daniel M. G. Freitas ◽  
Akidauana D. B. Oliveira ◽  
Amanda M. Alves ◽  
Shirley N. Cavalcanti ◽  
Pankaj Agrawal ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Flow Instability ◽  
High Density ◽  
Low Density Polyethylene ◽  
Die Swell ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Polyethylene Blends

scholarly journals MELT COMPATIBILITY OF METALLOCENE LINEAR LOW-DENSITY POLYETHYLENE AND HIGH-DENSITY POLYETHYLENE BLENDS

2010 ◽  
Vol 010 (9) ◽  
pp. 1108-1115 ◽  
Author(s):  
Rui WANG ◽  
Qi YANG ◽  
Yajiang HUANG ◽  
Guangxian LI ◽  
Jinghui WANG ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Polyethylene Blends
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