Morphological properties of ultrahigh molecular weight polyethylene-polypropylene blend films produced by gelation/crystallization from solutions

1987 ◽  
Vol 20 (5) ◽  
pp. 1033-1041 ◽  
Author(s):  
Chie Sawatari ◽  
Shuka Shimogiri ◽  
Masaru Matsuo
Keyword(s):  
Molecular Weight ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Morphological Properties ◽  
Blend Films ◽  
Ultrahigh Molecular Weight

On the mechanical and morphological properties of highly performant composite laminates based on epoxy resin and oxidized ultrahigh-molecular-weight polyethylene fibers

2020 ◽  
Vol 32 (9) ◽  
pp. 992-1000 ◽  
Author(s):  
Raouf Belgacemi ◽  
Mehdi Derradji ◽  
Abdelrazak Mouloud ◽  
Djalal Trache ◽  
Abdeldjalil Zegaoui ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Epoxy Resin ◽  
Composite Laminates ◽  
High Performance ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Cost Effective ◽  
Polymeric Matrix ◽  
Morphological Properties ◽  
Ultrahigh Molecular Weight ◽  
Uhmwpe Fibers

In this study, new high-performance composite laminates were prepared from epoxy resin and surface modified ultrahigh-molecular-weight polyethylene (UHMWPE) fibers. The UHMWPE fibers underwent two types of chemical modifications, namely through chromic acid and potassium permanganate oxidations. The adopted chemical procedure aimed the grafting of polar groups on the outer surface of fibers for an improved chemical and physical compatibility with the polymeric matrix. The efficiency of the grafting methodology was confirmed by vibrational, thermal, and morphological analyses, and the grafting mechanism was thoroughly discussed. Furthermore, composite laminates were prepared to study the effects of chemical treatments on the mechanical and morphological properties of the resulting composites. The grafting techniques allowed consequent improvements in the tensile and bending properties, up to 34% and 23% for the tensile and flexural strengths, respectively. The study of the fractured surfaces confirmed the exceptional compatibility between the fillers and the polymeric matrix and further corroborated the mechanical findings. Finally, the adopted modification techniques can be regarded as cost-effective and highly suitable for the manufacturing of structural composites for advanced applications.

scholarly journals Gamma Rays Induced Modification in Ultrahigh Molecular Weight Polyethylene (UHMWPE)

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Suveda Aarya ◽  
Pawan Kumar ◽  
Mamta Bhatia ◽  
Sanjeev Kumar ◽  
Jyotsna Sharma ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gamma Ray ◽  
Polymeric Materials ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Oscillatory Behavior ◽  
Morphological Properties ◽  
Polymeric Chain ◽  
X Ray Diffraction ◽  
Ultrahigh Molecular Weight ◽  
Radiation Induced

Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma ray radiation-induced and investigated in correlation with the applied doses. Films were irradiated in a vacuum at room temperature by a 1.25 MeV Co60 a source with doses ranging from 0 to 300 kGg. The optical, chemical, structural, and surface morphological properties of the irradiated and unirradiated UHMWPE films were investigated by UV-Visible, FTIR, XRD, and SEM, respectively. The band gap E g decreases with increasing radiation dose and coloration effects have been seen at higher doses. FTIR spectra show an oscillatory behavior in the transmittance intensities without affecting in their peak positions. Number of small absorption peaks can be seen clearly which may be due to the cross-linking of the polymeric chain. No significant change in crystalline peak has been found in the X-ray diffraction pattern indicating the structural stability of the polymer. The morphology of the smooth topography of the polymer samples to change rougher one polymeric sample shows the formation of microvoids on the surface of the polymeric materials with the increase of the doses from 0 to 300 kGy.

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