Investigation of the state and distribution of water in poly(ethylene terephthalate)/polyethylene glycol copolymers with various molecular weight of polyethylene glycol

Ji, Peng; Jin, Jin; Ji, Guoying; Wang, Chaosheng; Wang, Huaping

doi:10.1002/pen.24104

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…These two kinds of water proton relaxation times represent two kinds of water molecules (adsorbed water and free water) in the Na-MMT–water system. Thus, the adsorbed water content ( m ad ) of Na-MMT can be calculated by the following eq Here, m f = m w – m ad .…”

Section: Results and Discussionmentioning

confidence: 99%

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Quantitative Investigation of the Hydration Behavior of Sodium Montmorillonite by Thermogravimetric Analysis and Low-Field Nuclear Magnetic Resonance

et al. 2019

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Shale hydration and swelling are major hindrances for using water-based drilling fluids to develop shale gas. Quantitative investigation of the hydration behavior of clay minerals is helpful to further develop high-performance inhibitors to use with water-based drilling fluids. In this work, the hydration behavior of sodium montmorillonite (Na-MMT) was investigated by isothermal adsorption, X-ray diffraction, and thermogravimetric analysis (TGA) with microporous crucible technology and low-field nuclear magnetic resonance (LF-NMR). The adsorbed water content and the basal spacing of Na-MMT were found to be a function of relative humidity. The adsorbed water on Na-MMT of the first step by TGA was the cationic interlayer water. The adsorbed water of the second step was the interlayer surface water. The adsorbed water of the third step was the sum of the part of interlayer surface water and free water. The experimental results of the cationic interlayer water and interlayer surface water measured using LF-NMR were consistent with the TGA results. According to the above results, it was inferred that if the cationic interlayer water and interlayer surface water can be removed, the surface hydration of Na-MMT could be completely inhibited.

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Section: Results and Discussionmentioning

confidence: 99%

“…MultiExp Inv Analysis software (Niumag, Shanghai, China) was employed to process the experimental results of LF-NMR. The spin–spin relaxation data were considered as the sum of exponentials in the time domain …”

Section: Methodsmentioning

confidence: 99%

Quantitative Investigation of the Hydration Behavior of Sodium Montmorillonite by Thermogravimetric Analysis and Low-Field Nuclear Magnetic Resonance

et al. 2019

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“…33 In the recent decade, low-eld nuclear magnetic resonance is attracting attention as a rapid, nondestructive and low-cost technique in the materials science. 34,35 The state and distribution of water in polymers can be determined by LF-NMR method while high-resolution NMR may destroy the mobility of water absorbed in polymer because of higher frequency pulse. 36 The state and distribution of water protons in matrix are well reected by LF-NMR.…”

Section: Introductionmentioning

confidence: 99%

Characterization of water state and distribution in fibre materials by low-field nuclear magnetic resonance

Jin

Chen

et al. 2016

RSC Adv.

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“…Attributed to poly(ethylene glycol) (PEG-600), a highly hydrophilic polymer, the surface hydrophilicity of the developed membranes was significantly enhanced with the addition of the additive polymer. Since polyethylene glycol is used in polyester modification and the hydrophilic modification effect is more prominent, the modifier of polyethylene glycol series was selected for the hydrophilic modification of PBAT in this paper. − …”

Section: Introductionmentioning

confidence: 99%

Hydrophilic and Biodegradable PBAT Copolyesters Prepared from Chemically Recycled Resources

Liu,

Jiang,

Zhou

et al. 2024

ACS Appl. Polym. Mater.

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Poly(butylene adipate-co-terephthalate) (PBAT) is the most extensively researched and developed biodegradable material. Its application in the production of garments, packaging, and films is limited due to the lack of polar groups on its surface. To address the issue of insufficient hydrophilicity of PBAT, this paper presents modified PBAT that incorporates a hydrophilic chain segment (polyethylene glycol, PEG) during the polycondensation process. Regenerated bis(hydroxybutyl)terephthalate (BHBT), a precursor material for the synthesis of biodegradable PBAT, was produced through the chemical alcoholysis of poly(butylene terephthalate) (PBT). Hydrophilic PBAT was then prepared by condensation polymerization with recycled BHBT, BHAT (dihydroxybutyl adipate), and PEG. It has been demonstrated that the successful doping of hydrophilic PEG into the main chain of PBAT improves its hydrophilicity. This leads to a decrease in elongation at the break and tensile strength. Additionally, the contact angle decreases to 46.71°, while the surface free energy (γ s ) increases to 42.99 mJ/m 2 . Hydrophilic PBAT copolyesters exhibit an increase in gas permeability, with the highest permeability coefficient of water vapor (OSF WV = 1.358). In the visible light range of 400−800 nm, PBAT copolyesters exhibit higher transmittance than PBAT materials, resulting in greater transparency. Additionally, R-PBAT has a higher loss modulus and energy storage modulus than the PBAT copolyester in the range of 0.1−100 rad/s. The inclusion of PEG chain segments enhances the melt fluidity of the PBAT copolyester, facilitating processing. While over the course of 30 days, the addition of PEG had an effect on the degradation rate of PBAT, which remained at 34.44%.

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Investigation of the state and distribution of water in poly(ethylene terephthalate)/polyethylene glycol copolymers with various molecular weight of polyethylene glycol

Cited by 10 publications

References 38 publications

Quantitative Investigation of the Hydration Behavior of Sodium Montmorillonite by Thermogravimetric Analysis and Low-Field Nuclear Magnetic Resonance

Quantitative Investigation of the Hydration Behavior of Sodium Montmorillonite by Thermogravimetric Analysis and Low-Field Nuclear Magnetic Resonance

Characterization of water state and distribution in fibre materials by low-field nuclear magnetic resonance

Hydrophilic and Biodegradable PBAT Copolyesters Prepared from Chemically Recycled Resources

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