Determination of crystallinity ratio and some physicochemical properties of poly(4‐methyl‐1‐pentene)

Yazıcı, Özlem; Çakar, Fatih; Cankurtaran, Özlem; Karaman, Ferdane

doi:10.1002/app.29985

Cited by 17 publications

(15 citation statements)

References 15 publications

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“…In other words, a low χ12 value reflects good compatibility. The following rules have been developed for the system [29,30]: an χ12 value that is lower than 0.5 indicates that the solvent is good, and a value of between 0.5 and 1 indicates a moderately suitable solvent, whereas a χ12 value that is larger than 1 indicates a poor solvent. The results are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Zhu

Wang

et al. 2019

Molecules

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The physicochemical properties of four 1-alkyl-3-methylimidazolium bromide ([CnC1im]Br, n = 5, 6, 7, 8) ionic liquids (ILs) were investigated in this work by using inverse gas chromatography (IGC) from 303.15 K to 343.15 K. Twenty-eight organic solvents were used to obtain the physicochemical properties between each IL and solvent via the IGC method, including the specific retention volume and the Flory–Huggins interaction parameter. The Hildebrand solubility parameters of the four [CnC1im]Br ILs were determined by linear extrapolation to be δ 2 ( [ C 5 C 1 im ] Br ) = 25.78 (J·cm−3)0.5, δ 2 ( [ C 6 C 1 im ] Br ) = 25.38 (J·cm−3)0.5, δ 2 ( [ C 7 C 1 im ] Br ) =24.78 (J·cm−3)0.5 and δ 2 ( [ C 8 C 1 im ] Br ) = 24.23 (J·cm−3)0.5 at room temperature (298.15 K). At the same time, the Hansen solubility parameters of the four [CnC1im]Br ILs were simulated by using the Hansen Solubility Parameter in Practice (HSPiP) at room temperature (298.15 K). The results were as follows: δ t ( [ C 5 C 1 im ] Br ) = 25.86 (J·cm−3)0.5, δ t ( [ C 6 C 1 im ] Br ) = 25.39 (J·cm−3)0.5, δ t ( [ C 7 C 1 im ] Br ) = 24.81 (J·cm−3)0.5 and δ t ( [ C 8 C 1 im ] Br ) = 24.33 (J·cm−3)0.5. These values were slightly higher than those obtained by the IGC method, but they only exhibited small errors, covering a range of 0.01 to 0.1 (J·cm−3)0.5. In addition, the miscibility between the IL and the probe was evaluated by IGC, and it exhibited a basic agreement with the HSPiP. This study confirms that the combination of the two methods can accurately calculate solubility parameters and select solvents.

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Section: Resultsmentioning

confidence: 99%

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Zhu

Wang

et al. 2019

Molecules

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“…For this reason, a relatively new methodology, based on inverse gas chromatography (IGC) measurements, is being recently employed to determine the crystallinity ratio. Although IGC measurements have been widely employed to study polymer-solvent interactions, its use to determine the crystallinity of a polymeric material is relatively new [8].…”

Section: Introductionmentioning

confidence: 99%

Bulk polymer/solvent interactions for polyethylene and EVA copolymers, below their melting temperatures

2016

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In this work, the Flory-Huggins parameters corresponding to the amorphous phase of a polyethylene (PE) and two ethylene-vinyl acetate (EVA) copolymers (with 18 and 33 % vinyl acetate content, respectively) samples, with different solvents have been determined below the melting temperature of the polymers, in order to quantify the bulk interactions of these polymer/solvent systems. The employed solvents were a dispersion solvent (cyclohexane), a polar solvent (vinyl acetate) and an association solvent (methanol). Initially, the inverse gas chromatography measurements allowed obtaining the retention volumes, activity coefficients and overall Flory-Huggins parameters of every polymer/solvent system. According to these parameters, in all cases, the more compatible solvent was cyclohexane, so it was selected as the probe to calculate the percentages of crystallinity at room temperature, whose results were in agreement the literature data (35 % for PE, 29 % for EVA18, and 12 % for EVA33). The percentage of crystallinity allowed determining the amorphous Flory-Huggins parameters which are the ones which take into account just the bulk interactions in a polymer/solvent mixture. The Flory-Huggins parameter results show that, to accurately study the vapor-liquid equilibrium between a polymer and a solvent (bulk interactions), when the range of studied temperatures is below the melting point of the polymer, it is crucial to calculate the amorphous contribution (v amorphous ) on the overall FloryHuggins parameter. In the case of this study, the lower the vinyl acetate content (higher crystallinity), the higher the difference between the overall and amorphous Flory-Huggins parameters is. Analyzing the interactions between the three polymeric materials and the solvents it can be noticed that, for the most compatible & Eduardo Díez solvent (cyclohexane), v amorphous represents the less contribution, or the highest correction, to the overall Flory-Huggins parameter (around 50 % for PE and EVA18, and 79 % for EVA33, the less crystalline polymer).

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“…It was found that the interactions between alkanes and iron oxide samples can become favourable with the increase of amorphous site of iron oxide samples at lower iron ion amount. This result can open a new research field on determination of crystallinity of inorganic particles by inverse gas chromatography, like polymers 51,52 . As expected, the iron oxide nanoparticles are of basic character by increasing with base concentration but decreasing with iron salt concentration.…”

Section: Resultsmentioning

confidence: 78%

Thermodynamic Characterization on Surface of Iron Oxide Nanoparticles Prepared by Co-precipitation: An Inverse Gas Chromatography Application

Beyaz¹,

Karaman²

2014

Asian J. Chem.

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Surface thermodynamics of magnetic particles are crucial for many applications. In this study, a series of magnetic iron oxide nanoparticles were synthesized by co-precipitation at room temperature varying iron salts and base concentrations. The retention times of several organic solvents on these iron oxide nanoparticles were obtained in the temperature range from 323 to 363 K by inverse gas chromatography at infinite dilution. The dispersive component of surface free energy, γS D , thermodynamic parameters of adsorption (free energy, ∆G SP , enthalpy ∆H SP , entropy, ∆S SP) and the acid KA and base KD constants were calculated for iron oxide samples. It was found that γS D values fluctuated between 36 mJ/m 2 and 20 mJ/m 2 for all of the samples and temperatures. It was seen that the values of KD/KA were proportional with base concentration but inversely proportional with iron concentration. Hence it was arisen that the adsorption properties and acidbase contributions to the surface energy of iron oxide nanoparticles prepared by co-precipitation method altered considerably depending on the synthesis conditions. It can be said that the more effective surface modifications can be carried out adjusting synthesis conditions of iron oxide nanoparticles.

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Determination of crystallinity ratio and some physicochemical properties of poly(4‐methyl‐1‐pentene)

Cited by 17 publications

References 15 publications

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Bulk polymer/solvent interactions for polyethylene and EVA copolymers, below their melting temperatures

Thermodynamic Characterization on Surface of Iron Oxide Nanoparticles Prepared by Co-precipitation: An Inverse Gas Chromatography Application

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