Effect of adding feldspar on free volume properties of crosslinked polyester studied by positron annihilation lifetime spectroscopy

Gomaa, Eman Zakaria; Asaad, J. N.

doi:10.1002/app.35492

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The integration of mineral particles led to expanding the local free volume in composite structure by improvement in the movement of PU chains. [ 57–60 ] Silane‐treated QRZ and FLS samples gave relatively lower MFI values according to their untreated samples. As an overall conclusion from these results, it can be said that QRZ and FLS additions yielded no indicative problems in the case of processing stages of TPU‐based composites because similar MFI values were observed.…”

Section: Resultsmentioning

confidence: 99%

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

Bouzmane

Tirkes

Yılmaz

et al. 2022

Vinyl Additive Technology

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In this study, quartz and feldspar powders were surface treated using a silane coupling agent to achieve a more compatible mineral surface with the polymer matrix. Details of surface characteristics of minerals were examined by energydissipative X-ray spectroscopy, contact angle measurements, and infrared spectroscopy. Thermoplastic polyurethane-TPU was compounded with minerals using the melt-blending technique. Mechanical, thermo-mechanical, meltflow, and morphological characterizations of TPU and relevant composites were performed by utilizing tensile and Shore hardness tests, dynamic mechanical analysis (DMA), melt flow index (MFI) measurements, and scanning electron microscopy (SEM), respectively. Water repellency of TPU and composites were also evaluated experimentally. Effects of surface treatments were discussed by comparing the results of composites filled with pristine and modified minerals. Results revealed that enrichment of quartz and feldspar surfaces confer mechanical and thermo-mechanical performance of composites. Mineral inclusions caused no drastic changes to the MFI parameter of TPU. The silane layer on the mineral surface displayed a barrier effect to water uptake of composites. Homogeneous dispersion and improved interfacial adhesion of mineral particles to the TPU phase were confirmed with help of SEM observations. Quartz exhibited slightly higher performance thanks to its silicarich composition. The findings of this research exhibited the considerable influence of the silane layer on the mineral surface on the mechanical performance of TPU-based composites.

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Section: Resultsmentioning

confidence: 99%

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

Bouzmane

Tirkes

Yılmaz

et al. 2022

Vinyl Additive Technology

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“…PALS is an important method for measuring the free volume of a polymer [44][45][46], which provides microstructure information of the tested samples [47]. e positron annihilation lifetime spectrum was resolved into three lifetime components: τ 1 , τ 2 , and τ 3 [48].…”

Section: Free Volumementioning

confidence: 99%

An Investigation into the Evolution Law of Young’s Modulus of Polyurethane Coatings with Diluent Contents by Microstructure-Based Tests

Xie

Lin

Wang

et al. 2022

Advances in Materials Science and Engineering

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Recent studies have indicated that the addition of a diluent significantly affect its mechanical properties and performance of a coating, but no works have been reported on the influence of diluent content on the Young’s modulus of a coating, and the evolution law between them is also not clear. To address the deficiency, polyurethane coatings (paint samples) with different diluent contents were prepared. Force-displacement curves and microscan images of the coatings were obtained by atomic force microscopy, and the Young’s modulus of the coatings was calculated on the basis of the indentation method, and positron annihilation lifetime spectroscopy was used to test the microstructure of the coatings. The results reveal that: (i) Young’s modulus of the coating initially increase and then decreases with diluent content increasing; (ii) the free-volume aperture size had a greater effect on Young’s modulus by grey correlation analysis.

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“…Therefore, the mechanical properties of a polymer are closely related to its free volume [ 29 ]. Positron annihilation lifetime spectroscopy (PALS) is an important method for measuring the free volume of a polymer [ 30 , 31 , 32 ], and the polymer free volume information can be comprehensively understood by analyzing the o -Ps annihilation lifetime ( τ 3 ) and intensity ( I 3 ) [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Dilution on the Mechanical Properties and Microstructure of Polyurethane-Cement Based Composite Surface Coating

Xie,

Shi,

et al. 2024

Polymers

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Polyurethane-cement composite are widely used in modern civil engineering, and the method of adding diluent is often used to adjust the construction process to adapt to the engineering environment. Studies have shown that the addition of diluent impacts the performance of polyurethane-cement based composite surface coatings, but there have been few reports on the influence of diluent content on the mechanical properties and microstructure of the coatings. To address this, polyurethane coatings with different diluent contents were prepared, and positron annihilation lifetime spectroscopy was used to test the microstructure of the coatings. The tensile strength and elongation at rupture were tested using a universal material testing machine, and the fracture interface morphology of each coating was observed by scanning electron microscopy. Finally, the correlation between the microstructure parameters and the mechanical properties of the coating was analyzed using grey relation theory. The results demonstrated that with the increase in diluent content, (i) the average radius of the free volume hole (R) and the free volume fraction (FV) of the coating both showed a trend of first decreasing and then increasing. The value of R was between 3.04 and 3.24 Å, and the value of FV was between 2.08 and 2.84%. (ii) The tensile strength of the coating increased first and then decreased, while the elongation at rupture decreased first and then increased. Among them, the value of tensile strength was between 3.23 and 4.02 MPa, and the value of elongation at fracture was between 49.34 and 63.04%. In addition, the free volume in polymers plays a crucial role in facilitating the migration of molecular chain segments and is closely related to the macroscopic mechanical properties of polymers. A correlation analysis showed that the R value of the coating had the greatest influence on its tensile strength, while FV showed a higher correlation with the elongation at rupture.

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Effect of adding feldspar on free volume properties of crosslinked polyester studied by positron annihilation lifetime spectroscopy

Cited by 5 publications

References 11 publications

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

An Investigation into the Evolution Law of Young’s Modulus of Polyurethane Coatings with Diluent Contents by Microstructure-Based Tests

Influence of Dilution on the Mechanical Properties and Microstructure of Polyurethane-Cement Based Composite Surface Coating

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