Milled Glass Fiber Filled-Poly(Ethylene Terephthalate-co-Isophthalate)                Composites - Thermal and Mechanical Properties

Velasco, José Ignácio; Arencón, D.; Sánchez‐Soto, Miguel; Gordillo, Antonio; Maspoch, M. Ll.

doi:10.1177/0892705703016004006

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…Polyurea coatings have high tensile strength, flexibility, hardness, and water resistance. It has been reported [20][21][22] that the modification of polyurea through the addition of filler materials such as milled glass fibers or fly ash can yield composites with enhanced properties.…”

Section: Specimensmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

2020

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Aged structures and structures constructed based on outdated non-seismic design codes should be retrofitted to enhance their strength, ductility, and durability. This study evaluates the structural performance of reinforced concrete (RC) columns enhanced via polyurea or glass fiber reinforced polyurea (GFRPU) strengthening. Four RC column specimens, including a reference specimen (an unstrengthened column), were tested to evaluate the parameters of the strengthening materials and the strengthened area. The tests were carried out under a combined constant axial compressive load and quasi-static cyclic loading. The experimental results show that the composite strengthening provides lateral confinement to the columns and leads to enhanced ductility, shear-resistance capacity, and dissipated energy. The shear strength provided by the composites depends on the degree of lateral confinement achieved by the composite coating. The specimens finally failed through the development of diagonal tension cracks within the potential plastic hinge regions. The specimen treated with GFRPU strengthening showed greater strength and dissipated more energy than the specimen treated with polyurea strengthening. Furthermore, by modifying ATC-40, this study proposed an equation to estimate the shear capacity provided by the composites.

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Section: Specimensmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

2020

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“…Alternatively, glass fibers can be blended with a polymer to greatly improve the strength of the polymer [9]. Tests on milled-glass-fiber-filled polyethylene terephthalate-co-isophthalate composites were conducted by Velasco et al [10]. Their results showed a trend of increasing modulus with increasing fiber volume fraction.…”

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confidence: 99%

Polyurea-Based Composites: Ultrasonic Testing and Dynamic Mechanical Properties Modeling

Nantasetphong

Amirkhizi

Jia

et al. 2013

Composite Materials and Joining Technologies for Composites, Volume 7

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Many scientists and researchers study polyurea due to its excellent blast-mitigating properties. In this work, we have studied two polyurea composite systems with filler materials intended to improve dynamic mechanical properties. The two filler materials are milled glass and fly ash. The shape and quantity of filler significantly affect the dynamic mechanical properties of the composite. Ultrasonic tests were conducted on samples with both fillers. The volume fraction of the inclusions was varied to study the effect of filler quantity on mechanical properties. Moreover, computational models based on the methods of dilute-randomly-distributed inclusions and periodically-distributed inclusions were created to improve our understanding of polyurea-based composites and serve as tools for estimating the dynamic mechanical properties of similar composite material systems. The experimental and computational results were compared and show good agreement. The experiments and modeling have been conducted to facilitate the design of new elastomeric composites with desirable impact-and blast-mitigating properties. IntroductionThe failure of structures and materials in response to blast loadings is an active research area. Over the past 40 years, polyurea has been investigated as a potential coating material to help absorb and dissipate blast energy. Polyurea is the generic name for a block copolymer formed from a chemical reaction of diisocyanates with polyamines [1]. The reaction is generally very fast and insensitive to humidity and low temperatures [2]. This viscoelastic material is stable and incredibly tough, making it a popular material for coating applications. Additionally, researches have shown that polyurea also has an excellent blast-mitigating capability. Structures selectively coated with polyurea could potentially absorb more impact energy before failure and enhance the dynamic performance of structure [3][4][5][6].Recent researches have focused on modifying polyurea with filler materials to create composites with enhanced properties. Qiao et al. [7,8] reduced the density but increased the strength of polyurea by mixing it with fly ash. As the volume of fly ash increases, the density of the composite decreases, while the storage modulus as measured by dynamic mechanical analysis (DMA) increases. Alternatively, glass fibers can be blended with a polymer to greatly improve the strength of the polymer [9]. Tests on milled-glass-fiber-filled polyethylene terephthalate-co-isophthalate composites were conducted by Velasco et al. [10]. Their results showed a trend of increasing modulus with increasing fiber volume fraction. Increasing wear resistance is another advantage of polymer composites containing milled glass fibers [11].In this work, two kinds of composites with different inclusion shapes were studied with two objectives in mind: (1) to investigate the effect of inclusion content on dynamic mechanical properties and (2) to present the models which effectively

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An investigation on the rheology, morphology, thermal and mechanical properties of recycled poly (ethylene terephthalate) reinforced with modified short glass fibers

et al. 2008

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This work was done with the aim to solve an important environmental issue regarding poly (ethylene terephthalate), (PET) wastes. Samples of recycled PET (r‐PET) were reinforced with 10 to 30 wt% modified short glass fibers (SGF) through a melt mixing process in an internal mixer and their performance were assessed and compared with those of commercial glass reinforced PET through investigation of their rheology, morphology, thermal, and mechanical properties. It was found that the mechanical properties of the glass reinforced r‐PET composites in most cases were comparable or even higher than those of the commercial grades. The impact strength of the 30 wt% SGF filled r‐PET composite was about 30% higher than the commercial grades. This led to a conclusion that the PET wastes can be successfully converted to easily moldable thermoplastic materials by incorporation of 30 wt% SGF having a good balance of properties. Through investigation of rheological and morphological properties the optimum conditions for the best reinforcement performance were determined. The r‐PET with 30 wt% glass fiber content showed the highest level of orientation and improved interaction with the r‐PET matrix while having an acceptable flow behavior and processability. In spite of significant fiber breakage during the melt mixing process, leading to about 20 times reduction in the fiber aspect ratio, the composites maintained their good mechanical properties and showed a shear thinning behavior at high shear rates. The incorporated glass fibers acted as nucleating agents and improved the crystallization rate of r‐PET leading to an overall increase in the crystallinity. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

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Milled Glass Fiber Filled-Poly(Ethylene Terephthalate-co-Isophthalate) Composites - Thermal and Mechanical Properties

Cited by 8 publications

References 24 publications

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

Polyurea-Based Composites: Ultrasonic Testing and Dynamic Mechanical Properties Modeling

An investigation on the rheology, morphology, thermal and mechanical properties of recycled poly (ethylene terephthalate) reinforced with modified short glass fibers

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