Biomimetic Reversible Heat-Stiffening Polymer Nanocomposites.
Biomimetic Reversible Heat-Stiffening Polymer Nanocomposites.
复制标题
仿生可逆的燃热聚合物纳米复合材料。
DOI：
10.1021/acscentsci.7b00215
复制
发表时间：
2017-08-23
影响因子：
18.2
通讯作者：
Rowan SJ
中科院分区：
文献类型：
--
作者：
Cudjoe E;Khani S;Way AE;Hore MJA;Maia J;Rowan SJ
受海参在暴露于刺激时（可逆）增加其真皮层硬度的能力的启发，我们在这里报道了一种刺激响应的纳米复合材料，它可以在暴露于温水时可逆地增加其硬度。由纤维素纳米晶体（cnc）组成的纳米复合材料与嵌入在聚醋酸乙烯酯（PVAc）基体中的较低临界溶液温度（LCST）聚合物接枝，显示出模量的急剧增加，例如，暴露在温水中时，从1到350 MPa，假设从cnc接枝聚合物破坏了纳米纤维之间的相互作用，并最小化了薄膜的机械增强。然而，暴露在LCST以上的水中会导致聚合物链的崩溃，并由于CNC相互作用的增强而导致纳米复合材料的硬化。支持这一假设的是节能耗散粒子动力学（EDPD）模拟，该模拟表明，当接枝聚合物链在温度诱导下坍塌时，cnc之间的吸引相互作用被打开，从而形成一个渗透增强网络。采用低临界溶液温度（LCST）聚合物接枝的纳米填充材料，制备了海参真皮层热增强聚合物纳米复合材料。
Inspired by the ability of the sea cucumber to (reversibly) increase the stiffness of its dermis upon exposure to a stimulus, we herein report a stimuli-responsive nanocomposite that can reversibly increase its stiffness upon exposure to warm water. Nanocomposites composed of cellulose nanocrystals (CNCs) that are grafted with a lower critical solution temperature (LCST) polymer embedded within a poly(vinyl acetate) (PVAc) matrix show a dramatic increase in modulus, for example, from 1 to 350 MPa upon exposure to warm water, the hypothesis being that grafting the polymers from the CNCs disrupts the interactions between the nanofibers and minimizes the mechanical reinforcement of the film. However, exposure to water above the LCST leads to the collapse of the polymer chains and subsequent stiffening of the nanocomposite as a result of the enhanced CNC interactions. Backing up this hypothesis are energy conserving dissipative particle dynamics (EDPD) simulations which show that the attractive interactions between CNCs are switched on upon the temperature-induced collapse of the grafted polymer chains, resulting in the formation of a percolating reinforcing network. Sea cucumber dermis inspired thermally stiffening polymer nanocomposites have been developed, using CNCs grafted with a lower critical solution temperature (LCST) polymer as the nanofiller.
登录
查看更多内容
影响因子：
5.5
作者：
Dagnon, Koffi L.;Shanmuganathan, Kadhiravan;Rowan, Stuart J.
通讯作者：
Rowan, Stuart J.
影响因子：
9.5
作者：
Lee, Won Jun;Clancy, Adam J.;Shaffer, Milo S. P.
通讯作者：
Shaffer, Milo S. P.
影响因子：
5.5
作者：
Pei, Aihua;Malho, Jani-Markus;Berglund, Lars A.
通讯作者：
Berglund, Lars A.
DOI：
10.1016/j.injury.2005.07.029
发表时间：
2005-11-01
影响因子：
2.5
作者：
Giannoudis, PV;Dinopoulos, H;Tsiridis, E
通讯作者：
Tsiridis, E
影响因子：
5.5
作者：
Dagnon, Koffi L.;Way, Amanda E.;Rowan, Stuart J.
通讯作者：
Rowan, Stuart J.