Molecular packing and the glass transition temperature of polymers

Аскадский, А.А.; Slonimskii, G.L.; Matveyev, Yu.I.; Korshak, V. V.

doi:10.1016/0032-3950(76)90114-3

Cited by 23 publications

(5 citation statements)

References 4 publications

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“…The glass transition temperature of polymer reflects the tightness of molecular packing or supramolecular structure that is mainly governed by noncovalent interactions such as hydrogen bonding, van der Waals, and hydrophobic interaction . For amorphous zein protein in the cast films, a layered structure of zein proteins has been reported in the presence of hydrophobic oleic acid, and this structure makes the zein protein chains have high mobility, less friction, and so a decreased T g .…”

Section: Resultsmentioning

confidence: 99%

Synergistic Effect of Oleic Acid and Glycerol on Zein Film Plasticization

Chai

Zhang

2012

J. Agric. Food Chem.

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Oleic acid and glycerol are two different molecules with different plasticization mechanisms, and their effects on the mechanical properties of zein film were investigated. The mechanical parameters of tensile strength (TS) and elongation to break (E) were improved by either oleic acid or glycerol in a dose-dependent manner up to 20%. When a combination of the two plasticizers in different ratios was used to make zein films, the highest TS was observed at a ratio of 3:1 of oleic acid to glycerol, and a synergy between them was revealed through a statistical analysis. A significant decrease of glass transition temperature (Tg) and different microscopic patterns examined by scanning electronic microscopy (SEM) indicate the supramolecular structure was changed by the plasticizers. A combination of plasticizers with different plasticization mechanisms might be a better way to synergistically improve the mechanical properties of biopolymer-based films for practical applications.

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Section: Resultsmentioning

confidence: 99%

Synergistic Effect of Oleic Acid and Glycerol on Zein Film Plasticization

Chai

Zhang

2012

J. Agric. Food Chem.

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“…For highly cross-linked networks we get { It will be recalled that the molecular packing coefficient is the ratio of the van der Waals molar volume of a body to the molar volume of the body. 2 It has been found 7,8 that for all polymers irrespective of their chemical structure the molecular packing coefficient near absolute zero k 0 is nearly the same and is equal to *0.731.…”

Section: Density and The Molar Volumementioning

confidence: 92%

“…In this case, the network properties are virtually the same as those of a linear polymer of the same chemical structure. The glass transition temperature can be calculated using the following equation 7,8 T g…”

Section: Calculations Of Glass Transition Temperatures Of Polymer Net...mentioning

confidence: 99%

“…Detailed calculations of glass transition temperatures of linear polymers and softening temperatures of highly cross-linked polymer networks can be found in the literature. 3,7,8 For the most part, actual networks correspond to an intermediate case since they contain rather long but finite-length linear fragments between cross-link points. Generalisation of Eqns ( 5) and (5a) taking into account the effects of both linear fragments and cross-link points of the network on the glass transition temperature resulted in the following relationship: 5,6…”

Section: Calculations Of Glass Transition Temperatures Of Polymer Net...mentioning

confidence: 99%

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Peculiarities of the structure and properties of highly cross-linked polymer networks

Аскадский¹

1998

Russ. Chem. Rev.

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“…In the third version of the calculation increments of the van der Waals volumes of the atoms V i and the a i and b i values [10] characteristic of each atom and each type of interaction were used: ( . )…”

Section: Logmentioning

confidence: 99%

Volume Holographic Material for Red Spectral Range Based on Polymer with Anthracene Side Groups

et al. 2021

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The possibility of volumetric phase recording based on photo-oxidation of the side anthracene groups of a new polymer with a glass transition temperature of ~338 K by oxygen that enters the layer across the boundary with the atmospheric medium, was established experimentally. Volumetric holographic gratings with a maximum diffraction effi ciency of 2.5-9.5% were recorded with the radiation from a He-Ne laser (λ = 633 nm) in layers 5-20-μm thick. It was shown that in layers thicker than 10 μm the diffraction effi ciency is limited by saturation of growth in the modulation depth of the optical path difference. This effect is due to increase in the radius of the photorefraction sphere around the photosensitizer molecule with the increased photoconversion of the anthracene groups, which lowers the resolution of the holographic grating and its effective thickness.

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Molecular packing and the glass transition temperature of polymers

Cited by 23 publications

References 4 publications

Synergistic Effect of Oleic Acid and Glycerol on Zein Film Plasticization

Synergistic Effect of Oleic Acid and Glycerol on Zein Film Plasticization

Peculiarities of the structure and properties of highly cross-linked polymer networks

Volume Holographic Material for Red Spectral Range Based on Polymer with Anthracene Side Groups

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