Highly Flexible Hybrid Polymer Aerogels and Xerogels Based on Resorcinol-Formaldehyde with Enhanced Elastic Stiffness and Recoverability: Insights into the Origin of Their Mechanical Properties

Joji Hasegawa, Taiyo Shimizu, Kazuyoshi Kanamori, Ayaka Maeno, Hironori Kaji, Kazuki Nakanishi

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Flexible low-density materials, such as aerogels and polymer foams, have received increasing attention as energy absorbers and cushions that protect artificial products and human bodies. Microscopic geometry is a crucial factor determining their mechanical functions, i.e. strength and toughness (flexibility). However, it is a formidable challenge to combine these two properties because they are mutually elusive in general; stiff materials are brittle, while flexible ones are soft. Here, we demonstrate lightweight porous polymeric materials based on a common phenolic resin, resorcinol-formaldehyde (RF) gels, with salient combinatorial properties of high stiffness (up to 100 MPa) and good recoverable compressibility (against 80-90% strain), which can deliver remarkable energy absorption and dissipation performances repetitively. The detailed investigation reveals that the unique mechanical features originate from the synergetic effect of interdigitated hard and soft components in polymer matrices as well as exquisitely designed highly branched microstructures both generated through the spontaneous supramolecular self-assembly of the nonionic block copolymer (F127) and RF oligomer, which is essentially analogous to how natural organisms create biological structural materials, e.g. nacre and bone.

Original languageEnglish
Pages (from-to)2122-2134
Number of pages13
JournalChemistry of Materials
Volume29
Issue number5
DOIs
Publication statusPublished - Mar 14 2017

Fingerprint

Xerogels
UCON 50-HB-5100
Aerogels
Formaldehyde
Nacre
Polymers
Stiffness
Mechanical properties
Phenolic resins
Energy absorption
Brittleness
Polymer matrix
Compressibility
Oligomers
Biological materials
Self assembly
Block copolymers
Toughness
Porous materials
Foams

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Highly Flexible Hybrid Polymer Aerogels and Xerogels Based on Resorcinol-Formaldehyde with Enhanced Elastic Stiffness and Recoverability : Insights into the Origin of Their Mechanical Properties. / Hasegawa, Joji; Shimizu, Taiyo; Kanamori, Kazuyoshi; Maeno, Ayaka; Kaji, Hironori; Nakanishi, Kazuki.

In: Chemistry of Materials, Vol. 29, No. 5, 14.03.2017, p. 2122-2134.

Research output: Contribution to journalArticle

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