Using supramolecular associations to create stable cellular structures in amorphous soft polymers

A new strategy to foaming of Poly(methyl acrylate ‐co‐2‐hydroxyethyl methacrylate) as a polymer with low glass transition temperature (Tg) and strength is proposed by introducing supramolecular interactions via quadruple hydrogen bonding ureido‐pyrimidinone (UPy) units. The supramolecular polymers f...

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Bibliographic Details
Published in:Polymers for advanced technologies 2018-12, Vol.29 (12), p.2868-2879
Main Authors: Jamalpour, Seifollah, Ghaffarian, Seyed Reza, Goldansaz, Hadi
Format: Article
Language:English
Subjects:
Autoclaving
Bonding strength
Cellular structure
Differential scanning calorimetry
Foaming
Glass transition temperature
Hydrogen bonding
Modulus of elasticity
Plastic foam
Polyhydroxyethyl methacrylate
Polymers
Polymethacrylic acid
Scanning electron microscopy
Size distribution
supramolecular polymer
Supramolecular polymers
Temperature
ureido‐pyrimidinone
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Summary:A new strategy to foaming of Poly(methyl acrylate ‐co‐2‐hydroxyethyl methacrylate) as a polymer with low glass transition temperature (Tg) and strength is proposed by introducing supramolecular interactions via quadruple hydrogen bonding ureido‐pyrimidinone (UPy) units. The supramolecular polymers formed a reversible amorphous network and are foamed in a batch process inside an autoclave using supercritical N2. The thermal and dynamical behaviors of unfoamed and foamed supramolecular polymers are studied by differential scanning calorimeter and dynamic mechanical thermal analysis. The presence of UPy units in poly(methacrylic acid‐co‐2‐hydroxyethyl methacrylate) forms a reversible amorphous network and slows down the chains dynamics and leads to increase in the glass transition temperature as well as elastic modulus before and after foaming. The cellular structures, obtained in different foaming temperature, saturation pressure, and UPy content, were investigated using scanning electron microscopy. The higher density of UPy units induced more stability and higher elastic modulus and developed the more stable, closed, and homogenous cell structure with higher expansion ratio and cell. The obtained results show that the supramolecular polymer can be foamed with appropriate cellular structure integrity and uniform cell size distribution at 90°C, 9 MPa, and 4.5 mol% UPy content.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.4210