用于纳米压印光刻技术的可重塑生物基硫醇烯玻璃rimers:先进的共价适应性实现可调表面特性

IF 4.5 3区 工程技术 Q1 CHEMISTRY, APPLIED
Bernhard Sölle , David Reisinger , Sarah Heupl , Alexander Jelinek , Sandra Schlögl , Elisabeth Rossegger
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引用次数: 0

摘要

我们从具有自适应形状重塑能力的天然表面中汲取灵感,利用紫外线诱导的纳米压印光刻技术制造出了刺激响应型微结构。为此,我们以自由基为介导,在烯丙基亚麻籽油(ALELO)上添加了一种三官能丁香酚基硫醇(SH3E)交联剂,从而合成了一种完全生物基的动态硫醇烯光聚合物。为了催化网络中羟基和酯基之间的键交换反应,引入了一种生物基丁香酚磷酸酯作为酯交换催化剂。此外,还添加了纯丁香酚作为活性稀释剂,以增加羟基的数量,从而加速热激活的键交换反应。经紫外线照射固化后,动态光聚合物的热稳定性可达 250°C,并能在 160°C 温度下的 62 分钟内松弛 63% 的原始应力。随后,利用纳米压印光刻技术制备了长宽比为 1:2.5 的微柱薄膜。动态网络的宏观回流能力使压印结构能够在热重塑步骤中重新定向。通过二维/三维光学显微镜、μCT 成像和静态水接触角测量对压印结构进行了表征。根据微柱的取向,水接触角在 118° 和 95° 之间变化,从而可能应用于微流控设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reshapable bio-based thiol-ene vitrimers for nanoimprint lithography: Advanced covalent adaptability for tunable surface properties

Reshapable bio-based thiol-ene vitrimers for nanoimprint lithography: Advanced covalent adaptability for tunable surface properties

Taking inspiration from natural surfaces known for their ability to adaptively remodel their shape, we fabricated stimuli-responsive microstructures by using UV-induced nanoimprint lithography. For this, a fully bio-based dynamic thiol-ene photopolymer was synthetized by the radical mediated addition of a trifunctional eugenol-based thiol (SH3E) crosslinker across an allylated linseed oil (ALELO). To catalyze the bond exchange reactions between the hydroxyl and ester groups within the network, a bio-based eugenol phosphate ester was introduced as a transesterification catalyst. Pure eugenol was further added as a reactive diluent to increase the number of hydroxyl groups and thus, accelerate the thermo-activated bond exchange reactions. Once cured by UV exposure, the dynamic photopolymer is thermally stable up to 250 °C and is able to relax 63% of the original stress within 62 min at 160 °C. Subsequently, films with micropillars, having an aspect ratio of 1:2.5 were prepared by using nanoimprint lithography. The macroscopic reflow capability of the dynamic network enabled a reorientation of the imprinted structures during a thermal reshaping step. The imprints were characterized by 2D/3D optical microscopy, μCT imaging and static water contact angle measurements. Based on the orientation of the micropillars, the water contact angle was varied between 118° and 95°, giving rise to a possible application in microfluidic devices.

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来源期刊
Reactive & Functional Polymers
Reactive & Functional Polymers 工程技术-高分子科学
CiteScore
8.90
自引率
5.90%
发文量
259
审稿时长
27 days
期刊介绍: Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.
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