Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed

A.C. Carvalho Esteves, de, J.C.M. Brokken-Zijp, J. Laven, H.P. Huinink, M.-P. Van, G. With, de

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Abstract

The cross-linking of linear di-vinyl-terminated Poly(dimethylsiloxanes) (PDMS) with tetrakis(dimethylsiloxane) was studied in the presence of different concentrations of the cross-linker (H/V = ratio of Si-H groups of the cross-linker and C=C bonds). The consumption of the Si-H and C=C bonds was monitored simultaneously by in situ Confocal Raman Microscopy (CRM) and ATR-FTIR Spectroscopy. When formulations with H/V > 1.0 are cross-linked at low temperature (25 °C) in air and atmospheric humidity conditions, hydrosilylation and secondary reactions occur simultaneously at early stages of the reaction. For H/V = 1.0 the C=C bonds are also consumed by side reactions.Films cross-linked from formulations with different H/V ratios were studied by NMR imaging, swelling/extraction experiments and SEM. Films cross-linked with H/V = 1.0 showed a slower magnetization decay due to the presence of a large percentage of extractable material not connected to the cross-linked network. After extraction, all the films show faster relaxation behavior, explained by the presence of two types of chemical cross-links as well as one type of physical cross-links. These cross-links result from the occurrence of hydrosilylation and secondary reactions and counterbalance each other at different H/V ratios.
LanguageEnglish
Pages3955-3966
JournalPolymer
Volume50
Issue number16
DOIs
StatePublished - 2009

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Polydimethylsiloxane
Hydrosilylation
Dimethylpolysiloxanes
Swelling
Magnetization
Atmospheric humidity
Microscopic examination
Spectroscopy
Scanning electron microscopy
Air
baysilon
Experiments
Temperature

Cite this

@article{3e24bb1716e14976a3230dfa43b0403e,
title = "Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed",
abstract = "The cross-linking of linear di-vinyl-terminated Poly(dimethylsiloxanes) (PDMS) with tetrakis(dimethylsiloxane) was studied in the presence of different concentrations of the cross-linker (H/V = ratio of Si-H groups of the cross-linker and C=C bonds). The consumption of the Si-H and C=C bonds was monitored simultaneously by in situ Confocal Raman Microscopy (CRM) and ATR-FTIR Spectroscopy. When formulations with H/V > 1.0 are cross-linked at low temperature (25 °C) in air and atmospheric humidity conditions, hydrosilylation and secondary reactions occur simultaneously at early stages of the reaction. For H/V = 1.0 the C=C bonds are also consumed by side reactions.Films cross-linked from formulations with different H/V ratios were studied by NMR imaging, swelling/extraction experiments and SEM. Films cross-linked with H/V = 1.0 showed a slower magnetization decay due to the presence of a large percentage of extractable material not connected to the cross-linked network. After extraction, all the films show faster relaxation behavior, explained by the presence of two types of chemical cross-links as well as one type of physical cross-links. These cross-links result from the occurrence of hydrosilylation and secondary reactions and counterbalance each other at different H/V ratios.",
author = "{Carvalho Esteves, de}, A.C. and J.C.M. Brokken-Zijp and J. Laven and H.P. Huinink and M.-P. Van and {With, de}, G.",
year = "2009",
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language = "English",
volume = "50",
pages = "3955--3966",
journal = "Polymer",
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publisher = "Elsevier",
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Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed. / Carvalho Esteves, de, A.C.; Brokken-Zijp, J.C.M.; Laven, J.; Huinink, H.P.; Van, M.-P.; With, de, G.

In: Polymer, Vol. 50, No. 16, 2009, p. 3955-3966.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed

AU - Carvalho Esteves, de,A.C.

AU - Brokken-Zijp,J.C.M.

AU - Laven,J.

AU - Huinink,H.P.

AU - Van,M.-P.

AU - With, de,G.

PY - 2009

Y1 - 2009

N2 - The cross-linking of linear di-vinyl-terminated Poly(dimethylsiloxanes) (PDMS) with tetrakis(dimethylsiloxane) was studied in the presence of different concentrations of the cross-linker (H/V = ratio of Si-H groups of the cross-linker and C=C bonds). The consumption of the Si-H and C=C bonds was monitored simultaneously by in situ Confocal Raman Microscopy (CRM) and ATR-FTIR Spectroscopy. When formulations with H/V > 1.0 are cross-linked at low temperature (25 °C) in air and atmospheric humidity conditions, hydrosilylation and secondary reactions occur simultaneously at early stages of the reaction. For H/V = 1.0 the C=C bonds are also consumed by side reactions.Films cross-linked from formulations with different H/V ratios were studied by NMR imaging, swelling/extraction experiments and SEM. Films cross-linked with H/V = 1.0 showed a slower magnetization decay due to the presence of a large percentage of extractable material not connected to the cross-linked network. After extraction, all the films show faster relaxation behavior, explained by the presence of two types of chemical cross-links as well as one type of physical cross-links. These cross-links result from the occurrence of hydrosilylation and secondary reactions and counterbalance each other at different H/V ratios.

AB - The cross-linking of linear di-vinyl-terminated Poly(dimethylsiloxanes) (PDMS) with tetrakis(dimethylsiloxane) was studied in the presence of different concentrations of the cross-linker (H/V = ratio of Si-H groups of the cross-linker and C=C bonds). The consumption of the Si-H and C=C bonds was monitored simultaneously by in situ Confocal Raman Microscopy (CRM) and ATR-FTIR Spectroscopy. When formulations with H/V > 1.0 are cross-linked at low temperature (25 °C) in air and atmospheric humidity conditions, hydrosilylation and secondary reactions occur simultaneously at early stages of the reaction. For H/V = 1.0 the C=C bonds are also consumed by side reactions.Films cross-linked from formulations with different H/V ratios were studied by NMR imaging, swelling/extraction experiments and SEM. Films cross-linked with H/V = 1.0 showed a slower magnetization decay due to the presence of a large percentage of extractable material not connected to the cross-linked network. After extraction, all the films show faster relaxation behavior, explained by the presence of two types of chemical cross-links as well as one type of physical cross-links. These cross-links result from the occurrence of hydrosilylation and secondary reactions and counterbalance each other at different H/V ratios.

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DO - 10.1016/j.polymer.2009.06.022

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SP - 3955

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JF - Polymer

SN - 0032-3861

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