Mechanical properties of surface‐modified ultra‐high molecular weight polyethylene fiber reinforced natural rubber composites

2015 ◽  
Vol 38 (6) ◽  
pp. 1215-1220 ◽  
Author(s):  
Weiwei Li ◽  
Ruipei Li ◽  
Chunyang Li ◽  
Zhong‐Ren Chen ◽  
Li Zhang
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Natural Rubber ◽  
High Molecular Weight ◽  
Fiber Reinforced ◽  
Rubber Composites ◽  
Natural Rubber Composites ◽  
Polyethylene Fiber ◽  
Surface Modified ◽  
Ultra High Molecular Weight

The effect of simultaneous fiber surface treatment and matrix modification on mechanical properties of unidirectional ultra-high molecular weight polyethylene fiber/epoxy/nanoclay nanocomposites

2018 ◽  
Vol 52 (21) ◽  
pp. 2961-2972 ◽  
Author(s):  
Mohammad Mohammadalipour ◽  
Mahmood Masoomi ◽  
Mojtaba Ahmadi ◽  
Zahra Kazemi
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Tensile Strength ◽  
High Molecular Weight ◽  
Glycidyl Methacrylate ◽  
Interfacial Adhesion ◽  
Fiber Surface ◽  
Cohesive Failure ◽  
Polyethylene Fiber ◽  
Ultra High Molecular Weight

Nonpolar structure of ultra-high molecular weight polyethylene fiber leads to a weak interfacial adhesion in ultra-high molecular weight polyethylene fiber reinforced epoxy composite. Herein, synchronized fiber and matrix modifications were utilized so as to improve the interfacial adhesion, resulting in promoting mechanical properties of these composites. For this purpose, the surface of ultra-high molecular weight polyethylene fiber was chemically treated with glycidyl methacrylate and the epoxy resin was modified through incorporation of different contents of nanoclay. The mechanical properties results showed that individual modification, either fiber or matrix, can just lead to improvements around 36.74% and 10.54% in tensile strength as well as 14.28% and 4.27% in tensile modulus, respectively. However, the ultimate outcome of the study revealed that much higher improvement can be achieved in synergistic attitude. The highest enhancement around 48.31% and 26.76% in tensile strength and modulus were seen for the sample containing glycidyl methacrylate-treated ultra-high molecular weight polyethylene fibers as reinforcement and nano epoxy modified with 1 wt.% of nanoclay. Such observation could be attributed to the mechanical interlocking and chemical reaction which were arising from incorporation of nanoclay in matrix and chemical treatment of fiber surface, correspondingly. In this regard, fiber roughness and chemical bonds formed between treated fiber and modified matrix play a key role in improving interfacial adhesion. Moreover, the fractured surface of such composites studied by scanning electron microscope confirmed the mechanical results and showed that much more matrix was adhered to the fiber surface after treatment, indicating cohesive failure.

Strength tests of fiber-reinforced composite with ultra-high molecular weight polyethylene

2018 ◽  
Vol 68 (3) ◽  
pp. 293-301
Author(s):  
Rafał Brożek ◽  
Szymon Kubanek ◽  
Beata Czarnecka ◽  
Ryszard Koczorowski ◽  
Barbara Dorocka-Bobkowska
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Composite Material ◽  
High Molecular Weight ◽  
Organic Polymer ◽  
Fiber Reinforced ◽  
Uhmwpe Fiber ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Ultra High Molecular Weight

Introduction. Ultra-high molecular weight polyethylene (UHMWPE) fibers are inert, thus their adhesion to the organic polymer matrix of the composite material may not be rewarding. Therefore, these types of fibers have not yet come into widespread use in dentistry. Aim of the study. To evaluate selected strength characteristics of the UHMWPE fiber-reinforced composite whose surface was chemically activated and then impregnated with a mixture of dimethacrylate resins and coated with a microhybrid composite material. Material and method. Tests were carried out which allowed to evaluate selected mechanical properties of the material under static stretching and shearing. Results. Based on the experiments the following values were calculated: Young’s elastic modulus Et = 3583.97 ± 1325.75 MPa, tensile stress σ = 59.73 ± 7.54 MPa, maximum tensile force Fmax = 121.23 ± 17.92 N, linear extension εt = 0.03 ± 0.003 and tangential stress τt = 4.99 ± 1.19 MPa. The loss of adhesion of the material to the hard tissues of the tooth was typical of the mixed adhesive-cohesive breakthrough. Conclusions. The study revealed high and desired mechanical strength in both the tensile test and in the shear test, which may justify the effective use of this type of fibers in clinical practice. The phenomena of saturation and penetration of the resin into the space between the fiber bundles occurring in the oxidation process did not negatively affect the mechanical properties of the material tested.

Sign in / Sign up

Export Citation Format

Share Document