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Effect of Radiation from an Infrared Laser and γ-Rays from 60Co on the Molecular–Topological Structure of Polyvinylidene Fluoride
We investigate the molecular–topological structure of polyvinylidene fluoride (PVDF) irradiated with γ -rays from 60 Co and IR radiation from a carbon dioxide laser by the thermomechanical spectroscopy method. The initial PVDF has a topological three-block network structure containing the low- and h...
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Published in: | Journal of Russian laser research 2017, Vol.38 (5), p.482-489 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We investigate the molecular–topological structure of polyvinylidene fluoride (PVDF) irradiated with
γ
-rays from
60
Co and IR radiation from a carbon dioxide laser by the thermomechanical spectroscopy method. The initial PVDF has a topological three-block network structure containing the low- and high-temperature amorphous blocks and crystalline fragments. Both types of irradiation can initiate interblock mass transfer of the macromolecular fragments from the amorphous to the crystalline form. As a result, unlike the predominantly amorphous structure of the native polymer, which is 7% crystalline, the weight fraction of the crystalline modification of the PVDF due to irradiation by an IR laser increases to 72%. Comparative analysis leads to the conclusion that the PVDF has a greater resistance to
γ
-irradiation than to IR laser irradiation. After IR laser irradiation, the pseudo-network structure of PVDF undergoes noticeable changes. The quantitative content of the crystalline fragments of macromolecules increases by almost an order of magnitude; the mobility of chains is reduced, and the rigidity of the chains is increased. However, the molecular flow of the polymer irradiated by the laser and
γ
-rays begins in the same temperature range (437 – 441 K) near where the native polymer is flowing (438 K). |
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ISSN: | 1071-2836 1573-8760 |
DOI: | 10.1007/s10946-017-9671-3 |