Redondo Foj, MB.; Sanchis Sánchez, MJ.; Ortiz Serna, MP.; Carsí Rosique, M.; García, JM.; García, FC. (2015). The effect of cross-linking on the molecular dynamics of the segmental and β Johari–Goldstein processes in polyvinylpyrrolidone-based copolymers. Soft Matter. 11:7171-7180. doi:10.1039/c5sm00714c
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/64685
Title:
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The effect of cross-linking on the molecular dynamics of the segmental and β Johari–Goldstein processes in polyvinylpyrrolidone-based copolymers
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Author:
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Redondo Foj, María Belén
Sanchis Sánchez, María Jesús
Ortiz Serna, Mª Pilar
Carsí Rosique, Marta
García, José Miguel
García, Félix Clemente
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UPV Unit:
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Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada
Universitat Politècnica de València. Instituto de Tecnología Eléctrica - Institut de Tecnologia Elèctrica
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Issued date:
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Abstract:
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The effect of the cross-link density on the molecular dynamics of copolymers composed of vinylpyrrolidone (VP) and butyl acrylate (BA) was studied using differential scanning calorimetry (DSC) and dielectric relaxation ...[+]
The effect of the cross-link density on the molecular dynamics of copolymers composed of vinylpyrrolidone (VP) and butyl acrylate (BA) was studied using differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DRS). A single glass transition was detected by DSC measurements. The dielectric spectra exhibit conductive processes and three dipolar relaxations labeled as a, b and g in the decreasing order of temperatures. The cross-linker content affects both a and b processes, but the fastest g process is relatively unaffected. An increase of cross-linking produces a typical effect on the a process dynamics: (i) the glass transition temperature is increased, (ii) the dispersion is broadened, (iii) its strength is decreased and (iv) the relaxation times are increased. However, the b process, which possesses typical features of a pure Johari Goldstein relaxation, unexpectedly loses the intermolecular character for the highest cross-linker content.
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Soft Matter. (issn:
1744-683X
) (eissn:
1744-6848
)
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DOI:
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10.1039/c5sm00714c
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Publisher:
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Royal Society of Chemistry
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Publisher version:
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http://dx.doi.org/10.1039/C5SM00714C
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Project ID:
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CICYT for grant MAT2012-33483
Spanish Ministerio de Economía y Competitividad–FEDER (MAT2014- 54137-R)
Junta de Castilla y León (BU232U13)
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Thanks:
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B.R.F., M.J.S., P.O.S. and M.C. gratefully acknowledge CICYT for grant MAT2012-33483. F.G. and J.M.G. acknowledge the Spanish Ministerio de Economia y Competitividad-FEDER (MAT2014-54137-R) and the Junta de Castilla y Leon ...[+]
B.R.F., M.J.S., P.O.S. and M.C. gratefully acknowledge CICYT for grant MAT2012-33483. F.G. and J.M.G. acknowledge the Spanish Ministerio de Economia y Competitividad-FEDER (MAT2014-54137-R) and the Junta de Castilla y Leon (BU232U13).
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Type:
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Artículo
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