Reprogrammable and Light-Adaptive Mechanical Gradients in Waterborne High-Performance Nanocellulose Materials

水性高性能纳米纤维素材料中的可重编程和光自适应机械梯度

基本信息

批准号：
289996893
负责人：
Professor Dr. Christopher Barner-Kowollik
金额：
--
依托单位：
Department Chemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/289996893?language=en
关键词：
Reprogrammable Light Adaptive Mechanical Gradients

项目摘要

Mechanical gradients are ubiquitous in nature (attachment of ligaments to bones) and serve stress delocalization and optimize mechanical properties with regard to toughness, stiffness and abrasion resistance. They are inspiring for future synthetic materials in both structural as well as functional applications, where they can provide tougher joints between stiff and elastic materials, allow morphing procedures in structured, responsive hydrogels, or instruct cell fate and migration. Conceptually, gradient materials can be divided into (i) lateral and sandwich type gradients, (ii) 2D versus 3D patterned materials, and (iii) in terms of complexity from a one-time, irreversibly written gradient to a reprogrammable/rewritable gradient to an adaptive gradient. The central aim of this proposal is to implement, understand and exploit one-way and reversible photochemical conjugations to structure permanent, reprogrammable and light adaptive lateral gradients in mechanical properties to engineer mechanically superior and transparent hybrid nanopapers composed of highly defined complementary cellulose nanofibrils and polymers. We focus on three generations of CNF/polymer hybrid nanopapers with evolving complexity and property levels: (i) One-way gradients with self-reporting and irreversible photo-conjugations, (ii) Rewritable gradients using reversible photo-conjugations, (iii) Light-adaptive mechanical gradients exploiting the dynamics of reversible photo-conjugations. To address these interdisciplinar and multiscale challenges, we forge a coherent consortium of two complementary research groups to merge the required expertise in highly efficient photochemistry, precision macromolecular synthesis and surface engineering (Barner-Kowollik, KIT) with nanocellulose, colloid science, biomimetic nanocomposites and advanced mechanical testing (Walther, DWI). Jointly we aim at an integral understanding from the fundamental kinetics of the photochemical reactions via nano-/meso-/top-down structuring to molecularly controlled complex macroscale mechanical properties.

机械梯度本质上是普遍存在的（韧带附着在骨骼上），并在韧性，僵硬和耐磨性方面提供应力脱位并优化机械性能。它们激发了在结构和功能应用中的未来合成材料的启发，它们可以在僵硬和弹性材料之间提供更艰难的接头，允许在结构化的，响应的水凝胶或指导细胞命运和迁移中进行变形程序。从概念上讲，可以将梯度材料分为（i）横向和三明治型梯度，（ii）2D对3D图案材料，以及（iii）从一次不可逆写入梯度到可重编程/可重写的梯度到的复杂性到（iii）自适应梯度。该提案的核心目的是实施，理解和利用机械性能中的永久性，可重编程和光自适应侧向梯度来构建机械性能的永久性，可重编程和光自适应的横向梯度，以使机械上较高和透明的混合纳米型组成，由高度确定。我们专注于三代CNF/聚合物混合动力纳米纳米仪，具有不断发展的复杂性和财产水平：（i）具有自我报告和不可逆的照片连接的单向梯度，（ii）使用可逆的照片折叠式置换，（iii）光线（iii）光线（iii）光线 - 适应机械梯度，利用可逆光合缀合的动力学。为了应对这些跨学科和多阶段的挑战，我们建立了一个连贯的联盟，由两个互补的研究小组组成，以合并高效的光化学，精密型摩克分子合成和表面工程（Barner-Kowollik，kit，kit）中所需的专业知识，并将高级机械测试（Walther，DWI）。我们共同旨在通过纳米/中/自上而下的结构对光化学反应的基本动力学进行积分理解，从分子控制的复杂宏观机械性能。