Microstructure of the polymer chains and relaxational properties of the polybutadienes

Bartenev, R.M.; Baglyuk, Sergey; Tulinova, V. V.

doi:10.1016/0032-3950(90)90103-d

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“…In the mechanic of polymers such values are the parameters that characterize the relaxation properties of the material. These values and their corresponding dependence allow to judge about the structure of polymers and to determine the structural transition temperature and operating temperature of materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Changes of Rela[ation Parameters of Polyethylene during their Measurement

Komova¹,

Заиков²

2012

ChChT

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Section: Introductionmentioning

confidence: 99%

The Analysis of Changes of Rela[ation Parameters of Polyethylene during their Measurement

Komova¹,

Заиков²

2012

ChChT

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Probing the Interplay of Ultraviolet Cross-Linking and Noncovalent Interactions in Supramolecular Elastomers

et al. 2014

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Ultraviolet (UV) irradiated supramolecular polybutadienes (PBs) containing 2-ureido-4-[1H]-pyrimidone (UPy) linkages were examined as a simple model for curable supramolecular elastomers. Via precise control of UV exposure, the cure and the degradation of the vinyl groups within the PB elastomeric core were investigated. The combination of UPy binding and covalent cross-linking by UV irradiation dramatically enhanced mechanical properties of these UPy-functionalized elastomers, yielding toughness enhancement up to ∼200× at the 5 min UV cure. UVinitiated cross-linking dominated the curing process up to ∼50 min exposure time. Beyond this cure time, dominant degradation of the vinyl linkages was observed. Control of this UV-initiated process yielded supramolecular elastomers with a covalently cross-linked phase induced by UV irradiation combined with a noncovalent UPy cross-linked phase induced by secondary hydrogen bonding interactions. Of particular note, it was determined that the presence of UPy hydrogen-bonded aggregates accelerated the UV cross-linking process during the initial stage of exposure. This observation was attributed to microphaseseparated structure of UV-irradiated supramolecular elastomer, where UPy aggregation increased the probability of interaction between the pendant vinyls responsible for UV cross-linking. The systematic study of uniaxial tensile behavior of the UVirradiated supramolecular elastomers offers new insight into the design and architecture of mechanically tunable supramolecular elastomers.

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Microstructure of the polymer chains and relaxational properties of the polybutadienes

Cited by 2 publications

References 13 publications

The Analysis of Changes of Rela[ation Parameters of Polyethylene during their Measurement

The Analysis of Changes of Rela[ation Parameters of Polyethylene during their Measurement

Probing the Interplay of Ultraviolet Cross-Linking and Noncovalent Interactions in Supramolecular Elastomers

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