Experimental and numerical analysis of interfacial bonding strength of polyoxymethylene reinforced cement composites

Zhang, Wei; Xu, Xiao Li; Wang, Hailou; Wei, Fayun; Zhang, Yu

doi:10.1016/j.conbuildmat.2019.02.122

Cited by 44 publications

(16 citation statements)

References 35 publications

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“…In contrast, POM copolymers have good chemical durability and thermal stability, and are easy to process [3]. POM is one of the most widely used engineering thermoplastics in many areas of application such as agriculture, automobiles, the mechanical industry, and electromechanical equipment [4][5][6], which is due to its high tensile strength and rigidity, excellent wear and friction, and solvent resistance [7][8][9]. On one hand, the physical properties of POM are governed by the crystallization [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene

et al. 2020

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In this work, the effects of silver (Ag) nanoparticles on the melting behavior, isothermal crystallization kinetics, and morphology of polyoxymethylene (POM) were studied. It was found that the melting peak temperature (Tm) and the crystallization temperature (TC) of POM/Ag nanocomposites shifted to higher temperature with the content of Ag nanoparticles increased. In addition, the isothermal crystallization kinetics of POM/Ag nanocomposites were determined by Avrami and Lauritzen-Hoffman models. The results of crystallization half-time (t0.5), reciprocal of crystallization half-time (τ0.5), Avrami exponent (n), and Avrami rate constant (k) showed that low loading of Ag nanoparticles (≤1 wt%) accelerated the crystallization rate of POM. However, when the content of Ag nanoparticles reached 2 wt%, they aggregated together and restrained crystallization of POM. Meanwhile, the results of nucleation parameter (Kg) and surface free energy of folding (δe) revealed that Ag nanoparticles reduced the energy need to create a new crystal surface, leading to faster crystallization. Moreover, the crystallization activation energies (∆E) were determined using the Arrhenius model, which suggested that Ag nanoparticles induced the heterogeneous nucleation by lowing the ∆E. Furthermore, polarized light microscopy results indicated Ag nanoparticles generated a great amount of nucleation sites and led to the formation of smaller spherulites.

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Section: Introductionmentioning

confidence: 99%

Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene

et al. 2020

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“…In recent years, with the improvement of requirements for plastic materials in automobile, electronics, aerospace, military industry, chemical industry, and other fields, the market demand for functional polymers with lightweight, high mechanical strength, flame-retardant, antistatic, and high electromagnetic shielding has expanded rapidly. [1][2][3][4] Thereinto, the development of high-performance halogen-free polymeric materials, especially polyoxymethylene (POM), continue demanding high performance flame retardants. Because of the corresponding oxygen content of POM, macromolecular chain is very high (calculated as 53%), so that very little oxygen must be supplied from outside to support the constant combustion of POM.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of siloxane‐containing benzoxazine and its synergistic effect on flame retardancy of polyoxymethylene

Feng

Kang

et al. 2019

Polymers for Advanced Techs

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A type of trialkoxysilane‐containing naphtholoxazine compound (Naph‐boz) was successfully synthesized and combined with ammonium polyphosphate/melamine (APP/ME) as an intumescent flame retardant (IFR) to improve the flame‐retardant efficiency of polyoxymethylene (POM). The Underwriters Laboratories 94 (UL94) vertical burning test, limiting oxygen index (LOI), cone calorimeter, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Raman spectral analysis were used to study the flame‐retardant properties and related mechanism. The results showed that the formulation with 20 wt.% of APP, 6 wt.% of ME, and 4 wt.% of Naph‐boz passed UL94 V‐1 rating, and the LOI value was improved to 40.3%. Compared with pure POM, the IFR with Naph‐boz had greater reduction in peak heat release rate (lower 74.9%) and total heat release (lower 40.2%). SEM images showed that compact and reinforcing charred layer was formed during the POM/IFR/4Naph‐boz samples combustion, which was beneficial at reducing and maintaining low combustion parameters throughout the cone calorimeter test. The synergistic flame‐retardant effect between Naph‐boz and APP/ME was considered as the reason for the improvement in flame retardancy POM. Furthermore, because of the Naph‐boz was conducive to the compatibility between the flame retardants and matrix, the notched Izod impact strength of POM/IFR/4Naph‐boz composite was higher than that of POM/IFR system.

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“…Such a type of POM fiber exhibits a great potential in the application for reinforcement of inorganic building materials such as cements, concretes, plasters, gypsum, and geopolymers [19]. Although POM fibers can well meet the requirement for these highly demanded applications, they are not biodegradable because of the stable molecular structure of POM [20,21,22]. With rising environmental concerns and the focus on sustainable development as a worldwide tendency, there is growing awareness of the importance of biodegradable polymeric materials and their products in our ordinary daily life [23].…”

Section: Introductionmentioning

confidence: 99%

Crystalline Characteristics, Mechanical Properties, Thermal Degradation Kinetics and Hydration Behavior of Biodegradable Fibers Melt-Spun from Polyoxymethylene/Poly(l-lactic acid) Blends

Wang

et al. 2019

Polymers

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A series of polyoxymethylene (POM)/poly(l-lactic acid) (PLLA) blends were prepared by melt extrusion, and their spinnability was confirmed by rheological characterizations, successive self-nucleation, and annealing thermal fractionation analysis. The bicomponent fibers were prepared by means of the melt-spinning and post-drawing technologies using the above-obtained blends, and their morphology, crystalline orientation characteristics, mechanical performance, hydration behavior, and thermal degradation kinetics were studied extensively. The bicomponent fibers exhibited a uniform diameter distribution and compact texture at the ultimate draw ratio. Although the presence of PLLA reduced the crystallinity of the POM domain in the bicomponent fibers, the post-drawing process promoted the crystalline orientation of lamellar folded-chain crystallites due to the stress-induced crystallization effect and enhanced the crystallinity of the POM domain accordingly. As a result, the bicomponent fibers achieved the relatively high tensile strength of 791 MPa. The bicomponent fibers exhibited a partial hydration capability in both acid and alkali media and therefore could meet the requirement for serving as a type of biodegradable fibers. The introduction of PLLA slightly reduced the thermo-oxidative aging property and thermal stability of the bicomponent fibers. Such a combination of two polymers shortened the thermal lifetime of the bicomponent fibers, which could facilitate their natural degradation for ecological and sustainable applications.

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Experimental and numerical analysis of interfacial bonding strength of polyoxymethylene reinforced cement composites

Cited by 44 publications

References 35 publications

Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene

Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene

Synthesis of siloxane‐containing benzoxazine and its synergistic effect on flame retardancy of polyoxymethylene

Crystalline Characteristics, Mechanical Properties, Thermal Degradation Kinetics and Hydration Behavior of Biodegradable Fibers Melt-Spun from Polyoxymethylene/Poly(l-lactic acid) Blends

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