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C. Schnöll, C. Gorsche, T. Koch, N. Moszner, R. Liska:
"Introducing Debonding on Demand within highly Cross-Linked Photopolymers";
Poster: 5th European Symposium of Photopolymer Science, Mulhouse, France; 2018-09-03 - 2018-09-06; in: "5th European Symposium of Photopolymer Science", 5th European Symposium of Photopolymer Science, (2018), PO42.

Highly cross-linked polymers based on mono- and multifunctional methacrylates are commonly used as photopolymerizable glues and cements.1,2 However, the excellent adhesive properties of those materials lead to one of their main drawbacks, which is the difficult detachment of bonded joints. Therefore, a suitable adhesive that offers debonding on demand (DoD) through an external stimulus is of great interest for the fields of recycling and repair in applications such as microelectronics or dental medicine.
State-of-the-art DoD solutions based on cleavable crosslinks, which are incorporated into the polymer network, often require a high energy impulse (e.g., > 200 °C, strong force), due to the typical glassy nature of such photopolymers.
Herein, we introduce a thermolabile methacrylate-based crosslinker with blocked isocyanate (BIC) moieties, which enables thermally induced gas formation at temperatures well below 200 °C.3 In combination with a β-allyl sulfone-based chain transfer reagent we were able to create a highly crosslinked photopolymer exhibiting a tailored network architecture and DoD properties at ~150 °C.4 Furthermore, we affirmed the DoD-induced severe deterioration of the materials mechanical properties by tensile and Charpy Impact test.

Highly cross-linked polymers based on mono- and multifunctional methacrylates, excellent adhesive properties, debonding on demand, microelectronics, dental medicine