From Precision Polymer Synthesis to Nanocrystalline Stereocomplexed Polymer Systems
Abstract
Objectives. This project seeks to advance the precision polymer synthesis method that is not only living but also chemo- and stereoselective for the creation of unique nanocrystalline stereocomplexed supramolecular acrylic polymer systems. Such nanostructured, stereocomplexed polymers are crystalline yet transparent, but they are relatively brittle materials. Hence, four approaches are designed to toughen up such materials, through the precision synthesis and subsequent self-assembling stereocomplexation of four novel stereoregular acrylic polymer systems based on star-shaped stereoregular, stereo-sequence-controlled multiblock, hydrogen-bonded stereocomplex, and stereo-triblock polymer architectures. Methods. The polymer synthesis method is that of the advanced living, chemo- and stereoselective coordination-addition polymerization catalyzed by chiral transition-metal complexes, enabling simultaneous control over the resulting polymer architecture, functionality, and microstructure. The self-assembly methods for the construction of nanostructured crystalline supramolecular helical polymer stereocomplexes are the them1odynamically driven stereocomplexation between complementary isotactic and syndiotactic diastereomeric acrylic polymer chains as well as the stereoblock copolymer self-assembling processes. Significance. The potential impact of the project outcomes is threefold. First, the precision polymer synthesis method that this work is advancing will enable the synthesis of the polymers with the ultimate control over the polymer architecture (via livingness), functionality (via chemoselectivity), and microstructure (via stereoselectivity). Second, by possessing both high crystallinity and transparency, the nanocrystalline stereocomplexed polymers break the traditional polymer structure-property relationship rule. Third, the resulting toughened nanoscale crystalline supramolecular stereocomplexes will further enhance their resistance toward heat, solvent and stress, the properties called for applications such as soldiers visors and other protective armor.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 14, 2019
- Source ID
- W911NF1810435
Entities
People
- Eugene Chen
Organizations
- Army Contracting Command
- Colorado State University
- United States Army