Debonding on Demand with Highly Cross-Linked Photopolymers: A Combination of Network Regulation and Thermally Induced Gas Formation,Macromolecules

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Debonding on Demand with Highly Cross-Linked Photopolymers: A Combination of Network Regulation and Thermally Induced Gas Formation
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acs.macromol.7b02321
Christian Gorsche _{1,

2} , Christoph Schnoell _{1,

2} , Thomas Koch ₃ , Norbert Moszner _{2,

4} , Robert Liska _{1,

2}

Affiliation

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.

中文翻译：

高度交联的光敏聚合物按需脱胶：网络调节和热诱导气体形成的结合

通过外部刺激提供按需脱胶（DoD）的可光聚合胶水和胶粘剂对于回收和维修领域非常重要。先进的DoD解决方案通常需要高能量脉冲（例如，> 200°C，强力），这是由于此类光聚合物网络的典型玻璃状性质所致。在本文中，研究了各种封端异氰酸酯（BIC），它们能够在远低于200°C的温度下形成热诱导气体。热诱导气泡的形成是在线性热塑性聚（N-丙烯酰吗啉）基体在玻璃化转变温度以上，会引入孔隙。然后，材料内产生的孔隙会导致机械故障。然而，由于高度交联的光敏聚合物网络在远高于150°C的温度下呈玻璃状，因此保持不变。制备基于BIC的热不稳定的可光聚合的交联剂，以产生具有可裂解的交联的聚合物网络。另外，使用基于β-烯丙基砜的链转移剂来调节材料的最终交联密度和热机械性能。在所产生的急剧的玻璃化转变温度（> 60°C）以上，可能发生塑性变形，从而形成孔隙。这引入了具有定制网络结构的共价交联的不耐热光敏聚合物，作为约150°C下DoD的潜在胶。

更新日期：2018-01-16

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