Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s

Michiel Raaijmakers, Emiel Kappert, Arian Nijmeijer, Nieck Edwin Benes

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11 Citations (Scopus)
105 Downloads (Pure)

Abstract

In the thermal imidization of an alternating inorganic–organic hybrid network, there is an inverse relationship between the length and flexibility of the organic bridges and the extent of the layer shrinkage. The hybrid material studied here consists of polyhedral oligomeric silsesquioxanes that are covalently bridged by amic acid groups. During heat treatment, shrinkage of the materials occurs due to the removal of physically bound water, imidization of the amic acid groups, and silanol condensation. For five different bridging groups with different lengths and flexibilities, comparable mass reductions are observed. For the shorter bridging groups, the dimensional changes are hindered by the limited network mobility. Longer, more flexible bridging groups allow for much greater shrinkage. The imidization step can be described by a decelerating reaction mechanism with an onset at 150 °C and shows a higher activation energy than in the case of entirely organic polyimides. The differences in the imidization kinetics between hybrid and purely organic materials demonstrates the need for close study of the thermal processing of hybrid, hyper-cross-linked materials
Original languageEnglish
Pages (from-to)3031-3039
JournalMacromolecules
Volume48
Issue number9
DOIs
Publication statusPublished - 2015

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Imides
Ultrathin films
Kinetics
Acids
Hybrid materials
Polyimides
Condensation
Activation energy
Heat treatment
Water
Hot Temperature

Keywords

  • METIS-310418
  • IR-95801

Cite this

Raaijmakers, Michiel ; Kappert, Emiel ; Nijmeijer, Arian ; Benes, Nieck Edwin. / Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s. In: Macromolecules. 2015 ; Vol. 48, No. 9. pp. 3031-3039.
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Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s. / Raaijmakers, Michiel; Kappert, Emiel; Nijmeijer, Arian; Benes, Nieck Edwin.

In: Macromolecules, Vol. 48, No. 9, 2015, p. 3031-3039.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Thermal Imidization Kinetics of Ultrathin Films of Hybrid Poly(POSS-imide)s

AU - Raaijmakers, Michiel

AU - Kappert, Emiel

AU - Nijmeijer, Arian

AU - Benes, Nieck Edwin

PY - 2015

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N2 - In the thermal imidization of an alternating inorganic–organic hybrid network, there is an inverse relationship between the length and flexibility of the organic bridges and the extent of the layer shrinkage. The hybrid material studied here consists of polyhedral oligomeric silsesquioxanes that are covalently bridged by amic acid groups. During heat treatment, shrinkage of the materials occurs due to the removal of physically bound water, imidization of the amic acid groups, and silanol condensation. For five different bridging groups with different lengths and flexibilities, comparable mass reductions are observed. For the shorter bridging groups, the dimensional changes are hindered by the limited network mobility. Longer, more flexible bridging groups allow for much greater shrinkage. The imidization step can be described by a decelerating reaction mechanism with an onset at 150 °C and shows a higher activation energy than in the case of entirely organic polyimides. The differences in the imidization kinetics between hybrid and purely organic materials demonstrates the need for close study of the thermal processing of hybrid, hyper-cross-linked materials

AB - In the thermal imidization of an alternating inorganic–organic hybrid network, there is an inverse relationship between the length and flexibility of the organic bridges and the extent of the layer shrinkage. The hybrid material studied here consists of polyhedral oligomeric silsesquioxanes that are covalently bridged by amic acid groups. During heat treatment, shrinkage of the materials occurs due to the removal of physically bound water, imidization of the amic acid groups, and silanol condensation. For five different bridging groups with different lengths and flexibilities, comparable mass reductions are observed. For the shorter bridging groups, the dimensional changes are hindered by the limited network mobility. Longer, more flexible bridging groups allow for much greater shrinkage. The imidization step can be described by a decelerating reaction mechanism with an onset at 150 °C and shows a higher activation energy than in the case of entirely organic polyimides. The differences in the imidization kinetics between hybrid and purely organic materials demonstrates the need for close study of the thermal processing of hybrid, hyper-cross-linked materials

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