期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 47, 页码 19119-19124出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1213169109
关键词
responsive materials; topology; network disassembly spectrometry; tetrazine
资金
- Massachusetts Institute of Technology Department of Chemistry
- Institute for Soldier Nanotechnologies US Army Research Office [W911NF-07-D-0004]
- National Defense Science and Engineering Graduate Fellowship
Much of our fundamental knowledge related to polymer networks is built on an assumption of ideal end-linked network structure. Real networks invariably possess topological imperfections that negatively affect mechanical properties; modifications of classical network theories have been developed to account for these defects. Despite decades of effort, there are no known experimental protocols for precise quantification of even the simplest topological network imperfections: primary loops. Here we present a simple conceptual framework that enables primary loop quantification in polymeric materials. We apply this framework to measure the fraction of primary loop junctions in trifunctional PEG-based hydrogels. We anticipate that the concepts described here will open new avenues of theoretical and experimental research related to polymer network structure.
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