scholarly journals Creep and Recovery Behavior of Compression Molded Low Density Polyethylene/Cellulose Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Martin M. Riara ◽  
Abdallah S. Merenga ◽  
Charles M. Migwi
Keyword(s):  
Polymer Composites ◽  
Creep Behavior ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Time Behavior ◽  
Creep Tests ◽  
Cellulose Composites ◽  
Long Time ◽  
Wlf Model ◽  
Temperature Time

Low density polyethylene (LDPE) is an important industrial material because it is durable, light-weight, easily processed and characteristically inert, but its everyday use is hazardous to the environment. The solution to this seems to consist of incorporation of biopolymers in the structure of LDPE to form composites. Compression molded composites at different cellulose loading were subjected to creep tests at 30, 40, 50, and 60°C. The samples were displaced for 12 minutes and allowed to recover for 12 minutes. Creep behavior of the polymer composites was governed by temperature, time, and cellulose loading. Creep performance decreased with increase in temperature and improved with cellulose loading while creep modulus decreased with increase in time and temperature. Time temperature superposition was used to predict the long time (up to 106 s) creep behavior of the samples. William-Landel-Ferry (WLF) model offered a better description of the shift factors based on the short term data that was used to predict the long time behavior of the polymer composites by shifting the curves along the logarithmic time axis. The deformation was dependent on free volume.

Insert injection molding of low-density polyethylene single-polymer composites reinforced with ultrahigh-molecular-weight polyethylene fabric

2017 ◽  
Vol 31 (8) ◽  
pp. 1013-1028 ◽  
Author(s):  
Jian Wang ◽  
Dongjie Chen ◽  
Sui Wang ◽  
Ziran Du ◽  
Nannan Jiang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Injection Molding ◽  
Polymer Composites ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Woven Fabric ◽  
Low Density Polyethylene ◽  
Processing Temperature ◽  
Low Density ◽  
Injection Speed ◽  
Ultrahigh Molecular Weight

Low-density polyethylene single-polymer composites (SPCs) reinforced with sandwiched ultrahigh-molecular-weight polyethylene woven fabric were prepared by insert injection molding. The process combines aesthetic and processing advantages. A processing temperature window (135–155°C) of a very short cycle time (less than 30 s) could be realized. The mechanical properties and morphologies of the samples were evaluated. The results suggested that the polyethylene SPCs were prepared successfully with concurrent increases in flexural strength (∼57%), tensile strength (∼164%), and impact strength (∼69%). The effects of different processing parameters including the nozzle temperature, injection pressure, injection speed, and the holding time were discussed. Numerical simulation results were used in the analysis.

Effect of processing and density on morphology and creep behavior of linear low-density polyethylene

2011 ◽  
Vol 51 (8) ◽  
pp. 1642-1649 ◽  
Author(s):  
Yakov B. Unigovski ◽  
Arthur L. Bobovitch ◽  
Emmanuel M. Gutman ◽  
Dmitry Mogilansky
Keyword(s):  
Creep Behavior ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

Mechanical Properties of Natural Fibers Reinforced Polymer Composites: Palm/Low Density Polyethylene

2016 ◽  
Vol 869 ◽  
pp. 326-330
Author(s):  
Julia R. Guedes ◽  
Wagner Martins Florentino ◽  
Luciano Monteiro Rodrigues ◽  
Claudinei dos Santos ◽  
Daniella Regina Mulinari
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Natural Fibers ◽  
Polymeric Matrix ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Pure Polymer ◽  
Reinforced Polymer ◽  
Tensile Impact ◽  
Ldpe Composites

In the work, mechanical properties of palm fibers/low density polyethylene (LDPE) composites were studied. These fibers were mixed with the polymeric matrix (LDPE) in a thermokinetic mixer, in which fibers were responsible for 5 to 20 wt% in the composition. After the mixture, composites were dried, ground in mill and placed in an injector camera according to ASTM D-638 and ASTM D-790 specifications. Specimens were tested in tensile, impact, flexural and Shore A hardness mode. Results showed the addition fibers in polymeric matrix presented increase mechanical properties when compared to pure polymer

Thermal properties and degradability of low density polyethylene microcrystalline cellulose composites

2018 ◽  
Vol 32 (4) ◽  
pp. 487-500 ◽  
Author(s):  
Yousef Ahmad Mubarak ◽  
Raghda Talal Abdulsamad
Keyword(s):  
Weight Loss ◽  
Thermal Properties ◽  
Microcrystalline Cellulose ◽  
Crystallization Temperature ◽  
Nucleating Agent ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Scanning Calorimetry ◽  
Soil Burial ◽  
Cellulose Composites

The effect of microcrystalline cellulose (MCC) on the thermal properties (melting and crystallization temperatures and percentage crystallinity) and degradation of low density polyethylene (LDPE)–MCC blends were investigated. Weight percentages of MCC were varied at 0, 0.5, 1, 2.5, 5, 10, 20, and 30 wt%. The thermal properties of the composites were studied using differential scanning calorimetry while the degradation test was carried out using soil burial method; the weight loss of LDPE/MCC composites was measured and analyzed over a period of 120 days. It has been found that the addition of MCC to LDPE increased the crystallization temperature from 99°C to 103.5°C and decreased the melting temperature from 117°C to 113.6°C. A rule of a nucleating agent has been given as an interpretation to this increase in the crystallization temperature and intensity of crystals by the increase of MCC content. The dramatic reduction was in the percentage crystallinity where the value reduced from 58% for neat LDPE to about 11% for LDPE/30 wt% MCC. On the other hand, the addition of MCC has a little effect on degradation of LDPE; the weight loss did not exceed 1.5% over a period of 120 days. It seems that even at high MCC concentration, LDPE long carbon chains restrict and increase the resistance to microorganism attack and hence, reduce the hydrolysis and degradability.

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