Relaxation phenomena in polyvinyl alcohol
Dissipative effects are investigated by means of relaxation spectrometry in films of polyvinyl alcohol with various molecular weight and hydration degree. Peaks of mechanical loss reveal two relaxation transitions (α- and β-peaks) and one first order phase transition (δ-peak). It is found that decre...
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| Format: | Article |
| Language: | Russian |
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MIREA - Russian Technological University
2015-02-01
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| Series: | Тонкие химические технологии |
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| Online Access: | https://www.finechem-mirea.ru/jour/article/view/223 |
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| author | А. А. Kukhtenkova V. A. Lomovskoy K. I. Gorbatenko |
| author_facet | А. А. Kukhtenkova V. A. Lomovskoy K. I. Gorbatenko |
| author_sort | А. А. Kukhtenkova |
| collection | DOAJ |
| description | Dissipative effects are investigated by means of relaxation spectrometry in films of polyvinyl alcohol with various molecular weight and hydration degree. Peaks of mechanical loss reveal two relaxation transitions (α- and β-peaks) and one first order phase transition (δ-peak). It is found that decrease of hydration degree and increase of crystallinity degree in polyvinyl alcohol essentially increases temperature of α-transition. The α-peak shifts to the higher temperatures area with growth of the molecular weight. Situation of the β-peak does not depend on molecular weight but changes depending on hydration degree. Change of oscillation frequency is noted in area of α- and β-transition, which is indicative of shear modulus defect. |
| format | Article |
| id | doaj-art-2c128be6e51a4a0eac7a4d1139784b4d |
| institution | Kabale University |
| issn | 2410-6593 2686-7575 |
| language | Russian |
| publishDate | 2015-02-01 |
| publisher | MIREA - Russian Technological University |
| record_format | Article |
| series | Тонкие химические технологии |
| spelling | doaj-art-2c128be6e51a4a0eac7a4d1139784b4d2025-08-20T03:43:11ZrusMIREA - Russian Technological UniversityТонкие химические технологии2410-65932686-75752015-02-011018389217Relaxation phenomena in polyvinyl alcoholА. А. Kukhtenkova0V. A. Lomovskoy1K. I. Gorbatenko2M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571Dissipative effects are investigated by means of relaxation spectrometry in films of polyvinyl alcohol with various molecular weight and hydration degree. Peaks of mechanical loss reveal two relaxation transitions (α- and β-peaks) and one first order phase transition (δ-peak). It is found that decrease of hydration degree and increase of crystallinity degree in polyvinyl alcohol essentially increases temperature of α-transition. The α-peak shifts to the higher temperatures area with growth of the molecular weight. Situation of the β-peak does not depend on molecular weight but changes depending on hydration degree. Change of oscillation frequency is noted in area of α- and β-transition, which is indicative of shear modulus defect.https://www.finechem-mirea.ru/jour/article/view/223transitions α, β, δpolyvinyl alcohol, relaxation, relaxation spectrometry, vitrification |
| spellingShingle | А. А. Kukhtenkova V. A. Lomovskoy K. I. Gorbatenko Relaxation phenomena in polyvinyl alcohol Тонкие химические технологии transitions α, β, δ polyvinyl alcohol, relaxation, relaxation spectrometry, vitrification |
| title | Relaxation phenomena in polyvinyl alcohol |
| title_full | Relaxation phenomena in polyvinyl alcohol |
| title_fullStr | Relaxation phenomena in polyvinyl alcohol |
| title_full_unstemmed | Relaxation phenomena in polyvinyl alcohol |
| title_short | Relaxation phenomena in polyvinyl alcohol |
| title_sort | relaxation phenomena in polyvinyl alcohol |
| topic | transitions α, β, δ polyvinyl alcohol, relaxation, relaxation spectrometry, vitrification |
| url | https://www.finechem-mirea.ru/jour/article/view/223 |
| work_keys_str_mv | AT aakukhtenkova relaxationphenomenainpolyvinylalcohol AT valomovskoy relaxationphenomenainpolyvinylalcohol AT kigorbatenko relaxationphenomenainpolyvinylalcohol |