The use of differential scanning calorimetry for evaluating the intermolecular reaction changes in glass-like polymers

Bershteĭn, V. A.; Yegorov, V.M.; Razgulyayeva, L.G.; Stepanov, V. A.

doi:10.1016/0032-3950(78)90192-2

Cited by 19 publications

(4 citation statements)

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“…Increasing the temperature leads to gradual dissociation of the dimers, which is reflected in the DSC curves. However, the dimer formation is suppressed and contributes less at lower acid content. , …”

Section: Resultsmentioning

confidence: 99%

“…However, the dimer formation is suppressed and contributes less at lower acid content. 32,33 Thus, the Fox equation fails for predicting the glass transition of copolymers through the entire range of copolymer compositions due to the interacting nature of the polymer chains. Nevertheless, the "fitted" T g of 390 °C is useful for prediction of the glass-transition temperatures of copolymers with an acid fraction of less than 0.14, which allows establishing a processing window.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Improvement of Mechanical Properties of Anisotropic Glassy Polystyrene by Introducing Heat-Labile Reversible Bonds

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Improvement of Mechanical Properties of Anisotropic Glassy Polystyrene by Introducing Heat-Labile Reversible Bonds

et al. 2019

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“…AR is the sample for which the broadening of the transition phenomenon is the most pronounced (end of phenomenon = 81 °C). This was attributed to the presence of numerous acid functions capable of forming a hydrogen-bonded network. − Finally, in the case of the CMA (end of phenomenon = 75 °C), the broadening lies between those of CR and AR. This was ascribed to the lower amount of acid functions in CMA than that in AR.…”

Section: Resultsmentioning

confidence: 99%

Polystyrene Hybrid-Vitrimer Based on the Hemiacetal Ester Exchange Reaction

Boucher

Madsen

et al. 2021

Macromolecules

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Vitrimer materials, which are permanently cross-linked but reshapable polymers, are a class of materials of growing interest due to their potential in recycling and sustainable development. More precisely, vitrimers derived from commodity polymers could have a drastic impact on plastic consumption in the upcoming years. Here, the development of a polystyrene-based vitrimer harnessing the recently discovered hemiacetal ester exchange reaction of carboxylic acid is presented. 1,4-Cyclohexanedimethanol divinyl ether was reacted with 4-vinylbenzoic acid (VBA) to form a divinyl species containing two hemiacetal ester functions. This dimer was then copolymerized with styrene, butyl acrylate, and VBA to form a cross-linked material presenting pendent acid groups. This material exhibited three distinct behaviors at different temperature regimes: below 80 °C, despite the exchange reactions able to occur at this temperature, the cross-linked material behaved as a frozen material due to the hydrogen bonding formed by the carboxylic acid pendent groups. Between 80 and 130 °C, the vitrimer behavior was demonstrated by rheological creep experiments. At higher temperatures, the dissociation of the hemiacetal ester groups led to the loss of the covalent cross-linking.

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“…The higher the degree of hydration, the higher the temperature Тα of the α-relaxation process [1]. Many properties of PVA are presented in detail in S. N. Ushakov's monograph [2], studies conducted by methods of static sorption, DSC [3], and X-ray crystallography [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Degree of Hydration on the Relaxation Microheterogeneity of Segmental Mobility in PVA

Abaturova

Lomovskaya

Shatokhina

2021

KEM

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The use of differential scanning calorimetry for evaluating the intermolecular reaction changes in glass-like polymers

Cited by 19 publications

References 4 publications

Improvement of Mechanical Properties of Anisotropic Glassy Polystyrene by Introducing Heat-Labile Reversible Bonds

Improvement of Mechanical Properties of Anisotropic Glassy Polystyrene by Introducing Heat-Labile Reversible Bonds

Polystyrene Hybrid-Vitrimer Based on the Hemiacetal Ester Exchange Reaction

Influence of the Degree of Hydration on the Relaxation Microheterogeneity of Segmental Mobility in PVA

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