Debonding on Demand with Highly Cross-Linked Photopolymers:
A Combination of Network Regulation and Thermally Induced Gas Formation
Version 2 2018-01-18, 13:50
Version 1 2018-01-16, 20:00
Posted on 2018-01-18 - 13:50
Photopolymerizable
glues and cements that offer debonding on demand (DoD) through an
external stimulus are of great interest for the fields of recycling
and repair. State-of-the-art DoD solutions often require a high-energy
impulse (e.g., >200 °C, strong force), which is due to the
typical glassy nature of such photopolymer networks. Herein, various
blocked isocyanates (BICs) that enable thermally induced gas formation
at temperatures far below 200 °C are studied. Thermally induced
gas bubble formation is accomplished within a linear, thermoplastic
poly(N-acryloylmorpholine) matrix above glass
transition temperature, introducing porosity. The resulting porosity
within the material then causes mechanical failure. However, highly
cross-linked photopolymer networks remain unchanged due to their glassy
nature at temperatures well above 150 °C. A BIC-based thermolabile photopolymerizable
cross-linker is prepared in order to create a polymer network with
cleavable cross-link. Additionally, a β-allyl sulfone-based
chain transfer reagent is used to tune the final cross-linking density
and thermomechanical properties of the material. Above the resulting
sharp glass transition (>60 °C), plastic deformation becomes
possible, thus allowing formation of porosity. This introduces a covalently
cross-linked, thermolabile photopolymer with a tailored network architecture
as potential glue for DoD at ∼150 °C.
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Gorsche, Christian; Schnoell, Christoph; Koch, Thomas; Moszner, Norbert; Liska, Robert (2018). Debonding on Demand with Highly Cross-Linked Photopolymers:
A Combination of Network Regulation and Thermally Induced Gas Formation. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b02321
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AUTHORS (5)
CG
Christian Gorsche
CS
Christoph Schnoell
TK
Thomas Koch
NM
Norbert Moszner
RL
Robert Liska
KEYWORDS
covalently cross-linkedthermolabile photopolymergas bubble formationmaterialNetwork RegulationState-of-the-art DoD solutionsBIC-based thermolabile photopolymerizable cross-linkernaturepolymer networkphotopolymer networksglass transition temperatureThermally Induced Gas Formation Photopolymerizable gluesgas formationcross-linking densityCross-Linked Photopolymersthermomechanical propertiescleavable cross-linkcross-linked photopolymer networksβ- allyl sulfone-based chain transfer reagentnetwork architectureporosityoffer debonding