A semicrystalline polymer as a metastable microheterogeneous liquid

Mizerovskii, L. N.; Pochivalov, K. V.; Afanas'eva, V. V.

doi:10.1134/s0965545x10100019

Cited by 36 publications

(24 citation statements)

References 9 publications

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“…Анализ полученных результатов позволяет сказать, что пленка является одним из видов высокомолекулярных соединений, которые плавятся в широком интервале температур, а именно, частично кристаллическим медленно кристаллизующимся полимерам. [37][38][39] …”

Section: результаты и обсуждениеunclassified

Electrochemical Properties and Electropolymerization of Tetrakis(para-aminophenyl)porphyrin in Dichloromethane

Tesakova¹,

Popov²,

Sheinin³

et al. 2013

MHC

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Section: результаты и обсуждениеunclassified

Electrochemical Properties and Electropolymerization of Tetrakis(para-aminophenyl)porphyrin in Dichloromethane

Tesakova¹,

Popov²,

Sheinin³

et al. 2013

MHC

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“…Its density was measured on a DMA-4500 densimeter at 20-150°C to accuracy ±1.0·10 -5 g/cm 3 . The density in this temperature range obeys the equation…”

mentioning

confidence: 99%

“…with correlation coefficient R = 0.9999 and mean-square deviation σ = 5·10 -5 g/cm 3 . The liquid density and optical density measured in the frequency range 220-480 nm at room temperature remained unchanged after prolonged (greater than two months) use of the liquid after heating to 130°C and cooling to room temperature.…”

mentioning

confidence: 99%

“…According to the literature [3], a partially crystalline polymer for which the glassification temperature of the amorphous regions is below ambient is internally strained and exists in a state of thermomechanical equilibrium determined by the ratio in it of regions with different ordering levels (amorphous and crystalline) in the arrangement of the macromolecule monomer units. It was logical to suppose that the degree of reversibility of this equilibrium depended on how well it was attained at each temperature during cooling of the polymer from its melting point (mp) to room temperature.…”

mentioning

confidence: 99%

“…Kinetic curves for density change of load (1, 2) and LDPE(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) at various temperatures (°C)…”

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confidence: 99%

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Investigation of the amorphization process of partially crystalline polymers by hydrostatic weighing in an inert liquid

et al. 2011

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The potential of hydrostatic weighing of partially crystalline polymers in an inert liquid during the study of their amorphization and crystallization processes over a broad temperature range was demonstrated using the low-density polyethylene-polymethylsiloxane system as an example.Professor Kirill Evgen'evich Perepelkin was, at a minimum, an extraordinary being among domestic (Soviet and Russian) polymer scientists studying problems of chemical fiber technology. The scope of his scientific interests was exceptionally broad. However, the relationships of the properties of natural and synthetic polymers to their structure and the formation conditions of the latter practically constantly interested him. Therefore, the two articles on this theme that are published below by representatives of the Ivanovo school of polymer chemists, some of whom had the pleasure of conversing personally with Kirill Evgen'evich, have become by a twist of fate a symbol of our parting with this remarkable person and scientist.Hydrostatic weighing [1, 2] is a method aimed at studying structure transformations in partially crystalline polymers that are due to the temperature and thermodynamically active liquids under the condition that the polymer remains in the solid phase during the course of the experiment and does not contain fractions that are soluble in the given liquid in the studied temperature range. The practical capabilities of the method were published earlier [1-3].Obviously replacing a liquid that is thermodynamically active relative to the polymer by a thermodynamically inactive one will automatically fulfill the insolubility condition regarding fractions of any molecular weight. Therefore, it becomes possible to measure the weight in the liquid of a polymer that exists also in the liquid phase, i.e., the melt.Such an experiment is interesting from two viewpoints. First, the true temperature of full amorphization (melting of the last crystals) of a partially crystalline polymer can be determined as the intersection of the temperature dependences of the solid and liquid (melt) polymers. Second, the nature and extent of structural transformations of the polymer matrix related to the change of its molecular packing density can be judged from the time dependences of the polymer density at a constant temperature.Herein the amorphization of low-density polyethylene (LDPE) in polymethylsiloxane PMS-20 medium is examined as an example of the practical implementation of these capabilities.The subject of the study was LDPE (15083-020 grade, GOST 16377-77) with melt index 1.32 ± 0.2 g/10 min (IIRT-5M instrument, 190°C, load mass 2.16 kg) as disks (20.0 ± 0.2 mm diameter, 3.0 ± 0.1 mm thickness) prepared by pressing granules at 160°C followed by cooling in air.

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Hierarchical 3D Electrode Design with High Mass Loading Enabling High‐Energy‐Density Flexible Lithium‐Ion Batteries

Han,

Son,

Han

et al. 2023

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Flexible lithium‐ion batteries (LIBs) have attracted significant attention owing to their ever‐increasing use in flexible and wearable electronic devices. However, the practical application of flexible LIBs in devices has been plagued by the challenge of simultaneously achieving high energy density and high flexibility. Herein, a hierarchical 3D electrode (H3DE) is introduced with high mass loading that can construct highly flexible LIBs with ultrahigh energy density. The H3DE features a bicontinuous structure and the active materials along with conductive agents are uniformly distributed on the 3D framework regardless of the active material type. The bicontinuous electrode/electrolyte integration enables a rapid ion/electron transport, thereby improving the redox kinetics and lowering the internal cell resistance. Moreover, the H3DE exhibits exceptional structural integrity and flexibility during repeated mechanical deformations. Benefiting from the remarkable physicochemical properties, pouch‐type flexible LIBs using H3DE demonstrate stable cycling under various bending states, achieving a record‐high energy density (438.6 Wh kg−1 and 20.4 mWh cm−2), and areal capacity (5.6 mAh cm−2), outperforming all previously reported flexible LIBs. This study provides a feasible solution for the preparation of high‐energy‐density flexible LIBs for various energy storage devices.

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A semicrystalline polymer as a metastable microheterogeneous liquid

Cited by 36 publications

References 9 publications

Electrochemical Properties and Electropolymerization of Tetrakis(para-aminophenyl)porphyrin in Dichloromethane

Electrochemical Properties and Electropolymerization of Tetrakis(para-aminophenyl)porphyrin in Dichloromethane

Investigation of the amorphization process of partially crystalline polymers by hydrostatic weighing in an inert liquid

Hierarchical 3D Electrode Design with High Mass Loading Enabling High‐Energy‐Density Flexible Lithium‐Ion Batteries

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