Effects of sunshine UV irradiation on the tensile properties and structure of ultrahigh molecular weight polyethylene fiber

Zhang, Huapeng; Shi, Meiwu; Zhang, Jianchun; Wang, Shanyuan

doi:10.1002/app.12448

Cited by 27 publications

(1 citation statement)

References 63 publications

(77 reference statements)

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“…Therefore, it is reasonable to assign β-relaxation around −9˚C (Figure 3) to molecular motions from imperfect lateral packing and chain mobility [34]. In Table 4, the β-relaxation for neat UHMWPE is weak and the temperature is rather higher in comparison with that of the blend, and Tβ is still lower for UHMWPE/BATCH1 to UHMWPE/BATCH3.…”

Section: Dynamic-mechanical Thermal Analysis (Dmta)mentioning

confidence: 99%

Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw Extrusion

Rocha¹,

Cordeiro²,

Ferreira³

et al. 2016

MSA

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Oxidized (GO) and expanded (G-Exp) graphite were employed to prepare composites with ultrahigh molecular weight polyethylene (UHMWPE) matrix using masterbatches of polyethylene with different compositions. The materials and a blend of UHMWPE/HDPE were prepared by extrusion and their properties were evaluated. The effect of carbon fillers on the crystalline structure, thermo dynamic-mechanical (DMTA) and thermal properties (melting and crystallization temperatures) of the composites were discussed. The thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) measurements showed that the addition of masterbatch with GO and G-Exp significantly increased the crystallite size of composites, increasing the temperatures of melting, degradation, glass transition and the degree of crystallinity of polyethylene. DMTA analysis indicated the storage and loss moduli of composites in relation to neat UHMWPE, the blend and UHMWPE/composites. SEM micrographs showed a flatter, continuous and uniform surface meaning a compact lamellar structure. The present work resulted in interesting findings on the effects of GO on the crystalline structures, mechanical and thermal properties of UHMWPE, which can lead to generalizations useful for future work.

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Section: Dynamic-mechanical Thermal Analysis (Dmta)mentioning

confidence: 99%

Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw Extrusion

Rocha¹,

Cordeiro²,

Ferreira³

et al. 2016

MSA

View full text Add to dashboard Cite

show abstract

Molecular structure and orientation of gel‐spun polyethylene fibers

Karacan

2006

J of Applied Polymer Sci

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Characterization of molecular structure and orientation of six commercially available gel-spun polyethylene fibers have been carried out using infra-red and Raman spectroscopy, thermal and X-ray diffraction analysis, together with optical microscopy techniques. Thermal and X-ray diffraction analysis revealed the existence of highly oriented orthorhombic and monoclinic crystallites together with a highly oriented intermediate phase known as pseudohexagonal mesophase structure. The results suggest the existence of a three-phase structure consisting, at room temperature, of orthorhombic and monoclinic polymorphic crystallites, oriented noncrystalline and un-oriented noncrystalline (amorphous) phases, respectively. The crystallinity measurements have been carried out using density, thermal and X-ray diffraction analysis together with infra-red and Raman spectroscopy techniques whereas the molecular orientation measurements have been carried out using birefringence and polarized IR spectroscopy, respectively. The results obtained from density, thermal analysis, and Raman spectroscopy based on a simple two-phase modeling approach lead to the overestimated amorphous fractions and appears to ignore the presence of an intermediate phase known as oriented noncrystalline structure. X-ray analysis has also been used for the measurement of the apparent crystallite sizes. The birefringence values have been used to determine the overall orientation parameters whereas the dichroic measurements of IR bands have been used to determine the crystalline and oriented noncrystalline orientation parameters. The results show that the orthorhombic and monoclinic phases are more highly oriented than the oriented pseudohexagonally packed noncrystalline chains.

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Surface modification and physical properties of various UHMWPE‐fiber‐reinforced modified epoxy composites

Lin

Han

Yeh

et al. 2007

J of Applied Polymer Sci

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Two surface modification methods-plasma surface treatment and chemical agent treatment-were used to investigate their effects on the surface properties of ultrahigh-molecular-weight polyethylene (UHMWPE) fibers. In the analyses, performed using electron spectroscopy for chemical analysis, changes in weight, and scanning electron microscope observations, demonstrated that the two fibersurface-modified composites formed between UHMWPE fiber and epoxy matrix exhibited improved interfacial adhesion and slight improvements in tensile strengths, but notable decreases in elongation, relative to those properties of the composites reinforced with the untreated UHMWPE fibers. In addition, three kinds of epoxy resins-neat DGEBA, polyurethane-crosslinked DGEBA, and BHHBP-DGEBA-were used as resin matrices to examine the tensile and elongation properties of their UHMWPE fiber-reinforced composites. From stress/strain measurements and scanning electron microscope observations, the resin matrix improved the tensile strength apparently, but did not affect the elongation.

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Effects of sunshine UV irradiation on the tensile properties and structure of ultrahigh molecular weight polyethylene fiber

Cited by 27 publications

References 63 publications

Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw Extrusion

Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw Extrusion

Molecular structure and orientation of gel‐spun polyethylene fibers

Surface modification and physical properties of various UHMWPE‐fiber‐reinforced modified epoxy composites

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