Quantifying Structural and Solid‐State Viscoelastic Properties of Poly(propylene) (PP)/Poly(oxymethylene) (POM) Blend Films

Kaşgöz, Alper; Akın, Dincer; Durmuş, Ali

doi:10.1002/mame.201600109

Cited by 6 publications

(10 citation statements)

References 38 publications

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“…Finally, the short‐term creep test results were simulated by the Findley model in such a way that it provided long‐term creep performance (∼30 days). The TTS approach is based on the relationship between the effects of time and temperature on the physical properties of viscoelastic materials, and it is widely used to predict the long‐time linear creep performance of semi‐crystalline polymers with usage temperature higher than their T g 22,42 . The procedure applied to determine the 24 h‐term creep strain values of the samples based on TTS was explained in our previous study 22 .…”

Section: Resultsmentioning

confidence: 99%

“…Thanks to this feature, it is widely used to produce many products that work under a load for extended periods such as fiber, conveyor belts or shelves. Examining the literature on the creep property of PP shows that most papers are related to the creep resistance of different PP copolymers 13–16 and improvement of the creep resistance of PP by incorporating an organic/inorganic filler 17–20 or another polymer phase 21,22 . However, there is no detailed research investigating the effects of M w and polydispersity index (PDI) on solid‐state tensile creep properties that determine the physical lifetime of polymers in practical conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effects of molecular weight and molecular weight distribution on creep properties of polypropylene homopolymer

Kurt

Kaşgöz

2021

J of Applied Polymer Sci

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The molecular weights of the industrial‐grade isotactic polypropylene (i‐PP) homopolymers samples were determined by the melt‐state rheological method and effects of molecular weight and molecular weight distribution on solid and melt state creep properties were investigated in detail. The melt‐state creep test results showed that the creep resistance of the samples increased by Mw due to the increased chain entanglements, while variations in the polydispersity index (PDI) values did not cause a considerable change in the creep strain values. Moreover, the solid‐state creep test results showed that creep strain values increased by Mw and PDI due to the decreasing amount of crystalline structure in the polymer. The results also showed that the amount of crystalline segment was more effective than chain entanglements that were caused by long polymer chains on the creep resistance of the polymers. Modeling the solid‐state viscoelastic structure of the samples by the Burger model revealed that the weight of the viscous strain in the total creep strain increased with Mw and PDI, which meant that the differences in the creep strain values of the samples would be more pronounced at extended periods of time.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of molecular weight and molecular weight distribution on creep properties of polypropylene homopolymer

Kurt

Kaşgöz

2021

J of Applied Polymer Sci

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“…Creep behaviors of films were also modeled with the four‐element Burger equation which is a combination of characteristic Maxwell and Kelvin–Voigt elements and the most widely used viscoelastic model to quantify creep behaviors of thermoplastics, described as:

ε ((), t) = \frac{σ}{E_{normalM}} + \frac{σ}{E_{normalK}} ([], 1 - \exp ((), - \frac{E_{K} t}{η_{normalK}})) + \frac{σt}{η_{normalM}}

where σ is the applied stress, t is the time, E M , E K , η M , and η K are the elastic and viscous components of Maxwell element, and E K and η K are the elastic and viscous components of Kelvin element, respectively. Mathematical and physical explanations of the Burger model can be found elsewhere . Figure c represents the Burger model fits on the experimentally measured creep curves of samples by using of a nonlinear curve fitting function of “OriginPro 9” software ( R 2 > 0.98).…”

Section: Resultsmentioning

confidence: 99%

“…where σ is the applied stress, t is the time, E M , E K , η M , and η K are the elastic and viscous components of Maxwell element, and E K and η K are the elastic and viscous components of Kelvin element, respectively. Mathematical and physical explanations of the Burger model can be found elsewhere [6,40,41]. Figure 8c represents the Burger model fits on the experimentally measured creep curves of samples by using of a nonlinear curve fitting function of "OriginPro 9" software (R 2 > 0.98).…”

Section: Creep Behaviors Of Films By Dmamentioning

confidence: 99%

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Effects of liquid crystal polymer and organoclay addition on the physical properties of high‐density polyethylene films

Durmuş

Ercan

Alanalp

et al. 2019

Polymer Engineering & Sci

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In this study, physical properties of high‐density polyethylene (HDPE) films, blended and reinforced with small amounts of liquid crystal polymer (LCP) and organoclay (org‐clay), were investigated by employing different characterization tools such as X‐ray diffractometer, scanning electron microscope, differential scanning calorimetry, rotational rheometer, dynamic mechanical analysis, and gas permeability measurements. Viscoelastic properties of samples were quantified by applying several test procedures in melt and solid‐state dynamic measurements. It was found that rigid LCP droplets were dispersed well into HDPE matrix and improved the melt elasticity and creep resistance of HDPE. Compatibilizer and org‐clay loading into HDPE/LCP blends yielded formation of smaller LCP droplets and reduced mean relaxation time and shear modulus values, compared to unloaded counterparts. It was observed that org‐clay stacks were dispersed into HDPE phase due to using of maleic anhydride grafted polyethylene as compatibilizer and HDPE/LCP/org‐clay ternary nanocomposites exhibited intercalated microstructure. Solid‐state uniaxial tensile creep behaviors of films were modeled with the Findley power‐law and four‐element Burger models. HDPE/LCP/org‐clay (90/10/5) ternary nanocomposite film exhibited better gas barrier performance than HDPE by decreasing its permeability by 50%. POLYM. ENG. SCI., 59:1344–1353 2019. © 2019 Society of Plastics Engineers

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Roles of Chain Architecture and Polymorphic Form in Tailoring the Properties of Surface‐Roughened Biaxially Oriented Polypropylene Films for Capacitors

Wang,

Yao,

Huang

et al. 2023

Macro Materials & Eng

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Surface‐roughened films of biaxially oriented polypropylene (BOPP) are the most common polymeric dielectrics for oil‐immersed capacitors in electrical engineering. How to balance the roughness of film surfaces as well as the mechanical and high‐temperature electrical properties of film ontology remains a challenge. In this study, three grades of electrical specialized isotactic polypropylene resins with different distributions of molecular mass and stereo‐defects are surveyed for crystalline polymorphic behavior. The relationship of the chain microstructure, film surface topography, and mechanical and electrical properties determined through a comprehensive study of the resins’ chain architecture to the morphology of cast sheets and the characteristics of resultant films is elaborated. The chain features of wide molecular mass distribution and uniform stereo‐defects result in excellent β‐crystallization ability, leading to a fine, roughed topography on the film surface. The narrow distribution of molecular mass and the relatively high tacticity play a positive role in the physico‐mechanical properties of the films, especially in the improvement of breakdown strength at high temperatures. An appropriate chain architecture is vital to achieving the balance between surface topography and bulk performance in surface‐roughened BOPP films.

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Quantifying Structural and Solid‐State Viscoelastic Properties of Poly(propylene) (PP)/Poly(oxymethylene) (POM) Blend Films

Cited by 6 publications

References 38 publications

Effects of molecular weight and molecular weight distribution on creep properties of polypropylene homopolymer

Effects of molecular weight and molecular weight distribution on creep properties of polypropylene homopolymer

Effects of liquid crystal polymer and organoclay addition on the physical properties of high‐density polyethylene films

Roles of Chain Architecture and Polymorphic Form in Tailoring the Properties of Surface‐Roughened Biaxially Oriented Polypropylene Films for Capacitors

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