Mixing in reactive extrusion of low-density polyethylene melts: Linear vs. branched

1995 ◽  
Vol 35 (19) ◽  
pp. 1535-1545 ◽  
Author(s):  
R. Polance ◽  
K. Jayaraman
Keyword(s):  
Reactive Extrusion ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Melts

scholarly journals Stress relaxation and reversed flow of low-density polyethylene melts following uniaxial extension

2012 ◽  
Vol 56 (6) ◽  
pp. 1535-1554 ◽  
Author(s):  
Qian Huang ◽  
Henrik K. Rasmussen ◽  
Anne L. Skov ◽  
Ole Hassager
Keyword(s):  
Stress Relaxation ◽  
Uniaxial Extension ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Reversed Flow ◽  
Polyethylene Melts

scholarly journals Rendering Bio-Inert Low Density Polyethylene Amenable For Biodegradation Via Fast High Throughput Reactive Extrusion Assisted Oxidation

2021 ◽  
Author(s):  
Pablo Ferrero ◽  
Olivia A. Attallah ◽  
Miguel Ángel Valera ◽  
Ivana Aleksic ◽  
Muhammad Azeem ◽  
...  
Keyword(s):  
High Throughput ◽  
Operating Temperature ◽  
Crystallinity Index ◽  
Reactive Extrusion ◽  
Bacterial Attachment ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Carbonyl Index ◽  
Pre Treatment ◽  
Pretreatment Conditions

Abstract An energy efficient high throughput pre-treatment of low density polyethylene (LDPE) using a fast reactive extrusion (REX) assisted oxidation technique followed by bacterial attachment as an indicator for bio-amenability was studied. Silicon dioxide (SiO2) was selected as a model oxidizing and catalytic reagent with the REX process demonstrated to be effective both in the presence and absence of the catalyst. Optimized 5-minute duration pretreatment conditions were determined using Box-Behnken design (BBD) with respect to screws speed, operating temperature, and concentration of SiO2. The crystallinity index, carbonyl index and weight loss (%) of LDPE were used as the studied responses for BDD. FTIR and DSC spectra of the residual LDPE obtained after pretreatment with the REX assisted oxidation technique showed a significant increase in residual LDPE carbonyl index from 0 to 1.04 and a decrease of LDPE crystallinity index from 29% to 18%. Up to 5-fold molecular weight reductions were also demonstrated using GPC. Optimum LDPE pretreatment with a duration of 5 minutes was obtained at low screw speed (50 rpm), operating temperature of 380-390⁰C and variable concentration of SiO2 (0 and 2% (w/w)) indicating that effective pretreatment can occur under noncatalytic and catalysed conditions. Biofilms were successfully formed on pretreated LDPE samples after 14 days of incubation.Furthermore, the technique proposed in this study is expected to provide a high throughput approach for pretreatment of pervasive recalcitrant PE based plastics to reduce their bio inertness.

Experimental and numerical study of entry flow of low-density polyethylene melts

1996 ◽  
Vol 35 (5) ◽  
pp. 494-507 ◽  
Author(s):  
Jacques Guillet ◽  
Pascale Revenu ◽  
Yves B�reaux ◽  
Jean-Robert Clermont
Keyword(s):  
Numerical Study ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Melts

Biodegradation study of bio-corn flour filled low density polyethylene composites assessed by natural soil

2016 ◽  
Vol 36 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Samira Sahi ◽  
Hocine Djidjelli ◽  
Amar Boukerrou
Keyword(s):  
Filler Content ◽  
Alkali Treatment ◽  
Reactive Extrusion ◽  
Low Density Polyethylene ◽  
Natural Soil ◽  
Low Density ◽  
Corn Flour ◽  
Scanning Calorimetry ◽  
Soil Burial ◽  
Morphological Studies

Abstract This paper illustrates the aim to introduce biodegradable vegetable filler in synthetic polymers to prepare novel biodegradable composites. Low density polyethylene/alkali treated corn flour (LDPE/ATCF) composites were prepared by reactive extrusion using a twin-screw extruder. The microstructure, thermal properties and tensile properties were evaluated and compared with virgin LDPE. The Fourier transform infrared (FTIR) spectra showed a decrease in the hydrophilic nature of corn flour (CF) after alkali treatment. Scanning electron microscopy (SEM) micrographs showed good dispersion between matrix and filler. The tensile and elongation at break decreased by increasing the filler content in the composites. However, the Young’s modulus increased with the increase in filler content. The biodegradation of composites was studied in the environment using the soil burial test for 6 months. Differential scanning calorimetry (DSC) analysis showed an increase of the melting enthalpy (ΔHm) and crystallinity of LDPE with evidence of degradation. The biodegradability of the composites was enhanced with increasing ATCF content in the matrix. This result was supported by weight loss and degraded surface of composites observed through morphological studies. From the results, we conclude that the use of ATCF as filler in LDPE reduces pollution problems. This is advantageous for both the economy and the environment.

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