动态自适应高分子凝胶具备可逆转变的特性, 如可切换的力学状态, 因而具有更多样化的功能及应用, 受到广泛关注. 然而, 大多数现有材料的可切换状态或可逆转变能力有限. 本文利用高分子-高分子间相互作用与高分子-溶剂间相互作用的竞争, 发展了一种溶剂置换策略来可逆切换动态凝胶的交联网络结构及其力学性能. 当高分子-高分子间相互作用优于高分子-溶剂间相互作用时, 高分子网络由松散的交联模式转变为密集的交联模式, 此时,凝胶从软弱的状态转变为强韧的状态. 这种转变可以通过恢复高分子-溶剂间相互作用而逆转. 此外, 该力学性能可调的高分子凝胶在极端条件下还表现出不干燥和抗冻的性质. 这项工作提出了一种简单而高效的可逆调控高分子凝胶结构与性能的策略, 并为设计开发智能和适应性凝胶材料提供了理论基础.

This note shows that for any cluster algebra, the exchange graph has non-leaving-face property.

In this paper the notion of a N -finite state machine is introduced, as well as the concepts of a N -(immediate) successor, a N -exchange property and a N -subsystem are introduced. Some related properties are discussed. A condition for a N -finite state machine to satisfy the N -exchange property is established. A characterization of a N -subsystem is initiated. We prove that the isomorphism b...

We introduce a definition of admissibility for subintervals in interval exchange transformations. Using this notion, we prove a property of the natural codings of interval exchange transformations, namely that any derived set of a regular interval exchange set is a regular interval exchange set with the same number of intervals. Derivation is taken here with respect to return words. We characte...

Ž . Ž . ABSTRACT: The local spin-density LSD functional and Perdew]Wang 91 PW91 generalized gradient approximations to atomization energies of molecules are investigated. We discuss the coupling-constant dependence of the atomization energy and why exchange errors of the functionals are greater than exchange]correlation errors. This fact helps to justify hybrid schemes which mix some exact exch...

The bases-exchange graph of a matroid is the graph whose vertices are the bases of the matroid, and two bases are connected by an edge if and only if one can be obtained from the other by the exchange of a single pair of elements. In this paper we prove that a matroid is \connected" if and only if the \restricted bases-exchange graph" (the bases-exchange graph restricted to exchanges involving ...